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Les diagrammes suivants illustrent la methode. 1 J MICROCOPY RESOLUTION TEST CHART ANSI and ISO TESt CHART No 1 A -APPLIED IM/1GE Inc '>) *82 - 0300 - Phofie ■^) 288- 5989 -To. RECENT CYANIDE PRACTICE KDITI-D nv T. A, RirKAFs I'raiii ('yaiuiliitiiiii i>| Cone ititr. ill- I'ltU' (iniiiliii.; {\.M It ('111.111.1111.111 \V,-i, '11 \n-lr.ili I'a-.' ',. / , /;, ,ihv '.» /■r,/ii, IV /. Il..l<^.,n IJ /• /., /;, l'"itii' ('•rinilin^' I'liic I IriiicliMi' >'/" Siiu-!u 1\( I ir Ml'll!!^ Ir Wm.hI i,,r (' lllr Tl lie l.r.li lull'J \'. II ..I T. ih li.il.itulil I Ir .711; .'Ci I.. H. II :!'.i llu- .\-. .Ir Si.lllU H'iZ/mi); .l/.ii'i mill i. Till- ,\N^,lV ol I'v .llllill- Siilulii ■|"lu' Trr.ilir.i III m| Dc-rrl ( Ir.' 'riihiii ( . Sliiirs \. I'uIk' MilU ill 1:1 dp. M. .Ill, M /.. /V,. ' Ihirl,^ lUilt. Ill .-.I NU'lalluri;u al I )f\ . I. .luiunl . .11 ilir k.m.l (, . . 1 , /i, mi , ami //. -^. /'. •n ii. I rcatnunl ..! Urscrt ( 'r.- lati it I \ .iniilat 1. Ill I'p.-' Tulu' Mill I.tniiii; I 'r-ii^liiti^ .mil Ciniiilnii.; I'r.n tui- .it K.ik'i .. ulu 1' •I'lilii /.111. I >ii>t ■ . ^h.i^ iiii;. riu' rn-atiiunt ..t I )i /)'. rtr.iiii llllill (i. . I \.mi;ir X.iti- i]i|ii-r ami ( ' ill' Si.Uiti (NMimli- I'r.ii ti.c Willi Ilk- M.iiirr I'lltir I, I \. 1111. If I'ra.tui' with t'li M.^rr l-"ill!■ (dxri-x r^ 1', I 'i i)'|uT iti ('\'aniili' Si iluti in< /■'. J '. ('Ii,ni,ll, r Tnl.rMill 1.111111- ^. l>. 1/, ,l/;/w n I '.in>ii,ir,cti\ r Trst, Hi'i\M-c-ii i'mUc mul I'nulr l 'i1 f-.r M.-lliiiv I'mipilalr /■;. .1/. 1 1. nil ill. n: T'.il.r-Mili l.iiiiii^ ,1 /•; llrn.l,; r A Simii'r Siiluti.'ii Mi'Ur . I'. II Xn! .r Vx^^'j,vv--- 111 1 'v .niidal 1' III l\ii!!'>i I'll ('\ .iimlv I'r.i. II' r w nil ilir \1". ire I'llirr 1:,!:. ,ir,l II . \'ii//, r Rni'iil liiiiT'ix riiu-nl- 111 ilir ('\.mi \- \'r'Hr^^ h . I., /mis./iii i\, Illicit I'r.M Ii.i- :il K.il'.'Mi.rlif //. /. /)■(,.■/ I'vanwlf I'railurat K.ili" i^rlir W/»r,/ l.tiiu^ I'T' iuTi ^-^ 111 I '\ aiinl.i; I'lii During; I'.MIIi .l//i.,/ jaiii,':, •I'nlif Mill l.iniii- Wall, r IT. lUadl v ('\'.niiilc rii-.m-up /.iii.'r N /•.' I li.nihi'. Thr M.Mir,- and HinUT- FilUT-- Mark- Is'. Lam'' Siplion I)i\ur liir Riiiii I' in;j |-'!i 'atiiv- 'atonal /'.J;, w/i/ >, l\'iar.l Tllr HllUrrs I'lhrr 'I'lu- Riil,u\\ a\- I'lltcr Thr 1-iiilUr- I'llicr (■\ alliilal 1' Ml al l'. .yala, Mr\u .. Tlu- Hir trrs I'llirr Tul.r-\lill laiiiii;^ .\---av ' il" I '\ alllilf S' illlllMii^ ■I'll.- ffm !irs I'llur. , - .Mil- a. Tulv-MilW 'I'lir ■rrraliriiiil mI" 1 )r-iTt I In- Slinu- i'llUT- A-^av I li I '\aiialr S. ilui u.ii- Sliiiu- I'lltcriii,; ('\alliilr I'rarlii !■ al I \\c Wailll Mrlall\ir;.'iral I )r . rlc >! ■iiiciu al ( iuan.i iaaii. 'rrrai uu lit '■! Mallr Ir'nr. lln l'\aiiicli' Mill ( '\ alUiic I'rai 1 \'.\. al ( '. .j-ala A--av I 'I I > alluU- S. iliila al- 'rin- I'llrrali'iii I'f Sliiiir ii\ ill.' liullrr- Mrlh.iil ill.laii'l \cu Mi'lli' "N al Ciianaiaai", Mi \U' I'valll.lc !'ra( Ik.' at thr 1 1"11K"-I akr Mill- V'aiauun Shim- I"iltir> I "' iii\ r\ hil: 'i'aihii.j Thr. pii^li IMin- I "vaiii.lal i' '11 111 I 111- Transvaal t '\ aiii.Iai 1' '11 '11 I h',' Tiaiis\aal Till'r-MllK .il ( 'ilialiaillal' i ('"n\i'\anL; Tailing; in l.auiiilt'rs t'onscyiny Tailmv; in i.auii.li-rs Mark- A\ l.aiiih l-:,l:.-ar.l IL \ nil, r Laiirrih I- .^ '. I-I. Lulli'i k- i: s. r.-ttis il. /' Hiirry II. U, (/, ii.lar \'ark- K. Lamb l\ah, rt ( larL-r Hrrlrani liini! L A', niak; I '.'i/i'/'iA- .M Ilir ' 'l,i ^iih,,nh,r I:. I,', l-laiik-s / . .1. ki.k-ar.i .1. !■:. Pnu k-.r L. .M. \ . It. Hull,; \- lat'/i.s.'/is Ma. n.oiald I-:. M. Ilamilum I . .\. Kukar.l I- . /.. /.''.s./.'n . I . (/. /s"/V/m ( ■. n. Van Law . .1 mill, r ( 'arr, sfaiuirnt . 1 1, iiiiv Hros . !'. W. Will L.i-.c '/. 1 . ' '■'. I ^Ir.ini ( , ii Wni Lau- I I'll 1 1).' I(i4 1 111) 170 17-' 17-1 isl l,s!» I '.la 1'.I7 _'II7 .'HI .' 1 :i - 1 ;; J is; L'L'l J 'J ."i 2:; I .':(.■> ■.':i!t .'10 .'II 21.") 2 17 219 2.". I 2.">:! 2.">( 2 CO 2li."i 2»i7 2(i9 2i.Mi :(02 :i 1 2 :-:20 ;i22 :i2.'. ;i2i.» :;:u CVAXIDH AS A FACTOR IX GOLD PR()DU(TI()X J.iiui.ir\ fi, MMw; In hi- jircsiiltntial aiMrtss l)ctori' the theniiral section of the British Assneiati(jn. Ci. T. Heilliv said : iTdiii the early hes,'innin^'s of eivihzatKJn K"l'i I'^'s ''fon highi\- prize"! ami ea,t,'erlv soui^'ht after. Human Hfe has been treelv saerifueil in it^ aenuireinent froin natural sourees, as well as in its t.ireiMe seizure fnmi thnse who alreadv possessed it. The 'Aj^'e of flold' was not nei issaril\- the '(loliien .\^v.' for the nolile nietal, in its unii|ue ami liarl.arie splendor, lias svinhol- ized niueh that has luen unworth\- in national and individual aims and ideals. With the advent of the industrial a^'e f^'old was destined to take a new plai e m the world's historv as the ^'reat medium of e.\ehan,i,'e. the .i^reat proiiiotor of industrv and com- merce. While individual .ifain still rnn.iined the jir -pellin.i,' power toward its disco\cr\- anlv on the inciustrial and social coniliticjns of the time. So lont; as the chief sujjplies of gold were olitaiiii'd from alluvial deposits hy the simjile process of washins,'. the winning of ,i,'old almost necessarilv continued to he pursued h\ individuals, or 1)\- small ,L,'roui)s of workers, who were niainl\- attracltd ],v the hi.,dil\- speculative nature of the occupa- tion. These workers endured the un-atest hardships and ran the most seriou> pergonal risks, drawn on from dav to dav l.v the hope that some s],,.,!;,! stroke of ^'oof its K-.ld HI Ihr c'a.Mlv ivoAvn.l, ;.n.l Tru,v in ihr ivtnumrv or comhuwd torni. Th.' pn.l.Um nt nc.v.n- Iki,! now to 1 e at- tacke.l bv impnAv.l mechanical an.l du-nual nu'ihods. 1 hr -ul- phi.k's crlclluridrs will, which tliu ^'oM was assonatc.l ..r cirl nud had to l.f rcMliuvd in a slau- of ininulc subdi virion by more per- foct stamping' or urindm-, and elat)(..rale inveaulions weiv neivssary to insure metallu' eontaet between tlie particles of <,'old and the solvent nxM-eurv^ In manv eases the aina.h.'atP.ation pnux-s failed to extract n-ore than a verv moderate ,,roi ortion ot the i;old, an.l the -, which still coiiiained the re- mamdu- lonnd its wav ,nto creeks and nvcr>, or remaitied ,n heaps on the ground around .he latt>r:cs. In ner.'hborhuods where fuel was available a ,,n Innmarv roa^tuv.; ol ti'e ore was ,VM,rt(.l to, to oxioi/.e or v,,hn.li/e the baser metals and set free the "old or the sulphides, ulhuidcs. .ic, weie ccme.ntrated by waslnn-. and the concentratLS were lah. n to smehin- or chlor- inatii-4 works u, ^on-:e favorable Mlualion where the most elabor- ate metalhirmcal nutbods could Ic eco„,.micallv applied. Many HTorts were also made to applv tlic solver,! acii.m oi . ■ lorinc ,U,vctlv to the unconccntratcd. unroa.tcd or.s ; but unlortun- atelv chlorine ,. an excellent solvent tor other substances 1 esules Kol.l. and in practice it wa- found that its solvent cneri;v wris matnlv exercised on the base m. lals and metalloids, ana on the materials of which the apparatus n-clf was constructed. 1 nis practicallv xvas tlu' state of matters m isso, when the u^e ot a ,l,lute solution of cvanicle of , o!a-,>ium was lirst senouslv proposed f,,r the. .■xtniction of i;old fnnn Us cnvs. and the proposal was far ,V.,m f:.vorablv reuanhd from a ebemieal point of vu w. owm^ to the various ditlicultics wh.ich i-ivscnted themselves. llow cach and all of ihcsc ditlicultics have been swept aside. h.AV villiin li„k. more than a decade this mc tl.od ol :,old , xtraction has sp.read ,,ver the ^'old-pr,..kicinu c.mntr.es of the world, now absorbing ,„d now ivplacnm the older processes, but e-ver carrying all 1 e- ,,„,, „ all this ,s alreadv a twic. told tale v.lieh h.e onlv fe t nisiif.ed HI alluding to ^^-^ ll-.^-.v \vere then m.eetms on th.e Rand, where th.c' mlant process made its deln,l nearly fourteen vears .,ao The Rand todav is the rich.est of th.e world's Koi'i'ieMs. not onlv m us present capactv. but in its potentialnies ior the ;,,, .... .,,,],. ..»"..! ,,, ...>,;i .ilii !._.s Were unsv.s- ''!^Z,]. ^"vii' bv'.'vi.'r^ In isst. the 'world's consun.ption of !"■' expert- ( )' WIDI- A^ A FACTcK /\ 1,0/. D I'Rol )l ■( Tit )\ , v\-An\A- wt pi]ias-,uiii) ilhl not rxu'cl ,")() tons prr atimim At piTsrnt the riilin' runsuinption of cvanulr is not nuuli short of 1(1.(11)0 !,.:i. pir vrar. ni uliuh the Transvaal -oMti.^M consumes aJHiut oti.,q!„rrl. I.ar-;c cs-ani.lr works .xist in C.r. at P-rilain, (uM-nian\ . I-"ranr< . aii.l Aincrua, so that a <\irr and stra!' supplv ot l!ir na-.nt ha- \'vvn amp]' provi.U.,!- In IMM the pri(v of r>anrK- in tlif Trans\aal was I's -.n-v It,., to.ia\- u is S,l, " ('l„Mn- istrv has s,, ,,ft,.„ i„.rn . allr.l on lo pla\- tlu' part o» h,- huinhlL' an. I nnrr.o-ni^cl lian.hiiai.lm to ihr m.lustrial arts that he- mi-ht i.M-haps 1,L- panloiuMJ if m this .as,, h ■ rallr.l puMir atten- tion to I'rrlrflla as shr siiinrs m hrr ri,i;htful jiositDn as the L;;'nriis o^ n h.i-' I'ial initiation an 1 .lirrction. THH CVAXl!)!-: PROCESS AT CUAXAJ UATo 15V 1"kAN11> J, lloH-tlX .Ianu.ir\ 1. lillll.. In l^'.i'.l a ntliiil.cT (it c\aiiiilr tr-ts wnv \u:i'\<- "U ('iil"v ore 1,\- i-hrmisis m tin- tiiiplnv .if tlu- M.xuaii (".uM \- Silwr Rrrdvcrv t'..., tlu' .)\vnfi> uf ihr Mai'Anlnir l-'urrrst iiatcnts m tin- Kcpul.lic lit' Mrxicd. The ro'.ills of tlirsr tests \\\rv far frnin satisfartdrv TIk' cimsuniiJlii.ii of rvani.lc wa'- l^w liut tlu' t'Xtraitiuii alsn was low. avtrairiii!,' from 4(1 to .s.") ' , of tlu- sil\i-r aivl u'oM m the orr. Mo-^t of till' tests were iiiaile ou sample- weiuhini,' JOO i,'ram-. iruslieil to pass sereetis from ,'ll to sil-iiiesh. [n a-Mition to solulioiis of [lotassiiim exaiinle there \wre ad'ieil to tlie ehar!j;es uiiiler treatment, ilitTereiit pereentai;es of potas>uim terri-evanidc. permatv-janate, ami e\en ferro^ \ ani'le . ainl to some ol theiii wtTe U'liled \arious amounts of sodium dioMiie, The time of treatment, in nearh- ewr\- ease, was Hi hour,. In eonse(|Uenee ot these exiierinients, the proei'ss was eomlemned at ( 'luanajuatei. Shortly afterward, on tlie reeomniendation of V. A. WiU.see of the Venture Corporation, the Holmes hrothers t-xiierinientei! for -evera! months on Sireiia and t'uho ores ; the results of tlie-e f\irther expennu-nts led them to eonelude that the ores of this distnet i ould he sue- eessfullv evanided li\- slimini; everxthini;. One imiuU in their re])ort was esjieeialh' pr<-:iiiiiein, that e\enwith 4tl da\-' leakdiinj^ the sand. resuliin.L,' from eru-hinL; to 4(l-mesh i.;a\'' no extraetiun h\- treatm.i,' with i'\anide solution. Thi- was pii Swena ore Aliout three and a half Ncars u>^n the Hullers eompanv took up the iiuestion of i\ar,ulin'4 tlie Sireiia ore. and V.. M, Hamilton, of that eompanv. ran a series of t<'sts on a larL,'e seale at the Ihi' /ei;./.; Fastita, treatin',; sand and shme after ore eonei'iitration on Wiltlev tal.les: leaihiiiL; t!ie sa.ml and a:4itatin,L; the -lime. The ore was erushed in a -tanip-lialter\- to jja>s a ^U-niesh sereen. Fifteen davs' leaeliini,' of tlie sand witli D.H' , e\ anid.e solu- tion, and slime a'n,l,„„-..,.x,K.n>m.nts ''"■ ••ua,K„ua,n (•,,n>ul„latr.! .M,n,n,L: C-. .n.tallrd tlu ...vsmt .•xxH.n; plant, with a caparux , .tap,, n,xmiat,l\ L'(M)i,,n- p.V ,lav. Tw, vrars aL,'n I was rn-a.yr.i Sv - lu^ AnuTuan Fmancr & N ' nrnv ( .. m make, a nu lallui-i. al rxanunal,.,,, ,,| ,|„. \-al,.nnana ■"TV 11,,. ,natrnal iivaioKMNKanutnmuhrCna.lalupiMhnnp a 'lump uliHli runtain-, ahnut 1 ,0(10, 0(11) ,,,„s ,,t ,„v The tests "•^'■;' •"■■"''■ '■" I'^'H of ,1„. samples lakrn In ,m shafts ulneh were sunk tnr-.u.^h the ,hnn,. m nnler f, a.eertam ,ts vahu^ The tests "--■^' '"a.le wuh the.VMatnpt.nll an.i evant.le plant at tlu^ luu icula <''"'>-al, Fu-st we n„Ile,l several 1,„.„I ,,re wu h hatterv sereens ran,.n, trnm 20 „, ;i(K„u.,h, . -au en. ra.u,,,^ ,,„ a W.lfiev tahie ^eparaln,. san,l an,l sh„,e w,t!, spu^kastc., and sp.tzlutten The ^I"t/lutten were plaee.i unn.e.liatel V nn-ler the sp,t/kasten \n "■'"'"•"; -I""'""'" "as nl„a,ne,l, n.aku,,- appruxKnateh 70% •" '^'"'' "•"' ■^"'' '"■ ^Ii"H. Al„,nt -00 II, „f ,,„,! ,J^ '■'" "■■ '" 'iK' shnie were slnpp.,] „. .M,x,e,. C.v and there suh- ;!;:"■'' '" 'M-nn.ent ,„ tne ,al,ur„tnrv uf the Mexuan (luld & •''\^:'' '<;;"-':v^-" f.-s ..aeh ,>f - k,l.,.: „f „r.. w. v leaehed ^•nniinuallv, wul, snlutmns varvn,,. fr,,m 0.1 „, o :< Ke",. f..^ ';"''"' ''>>'^"l'>asethes,lverand^,,ld were pree,p„ated „n zinc ^hav.n.;. A lathn.^r ,,.,nple was taken da.lv fur l" davs there We.n,^. .'I sandnhai-es under treatment. At the end uf I" davs iiH' extraei.nn eeased, fvamde .-.nisumptmn ran....! fn,m Tf, •" I." H'. per t.,n ni ore treated. Wul, 0.;^ and 4', .solu- tions th.. extraet.nn was e^ual t„ that seeured w,th stn-n^er s„- lut.otns. and the e-,nsu,npt,.,n of evan,de wasonlv one pnnnd per .on '" ';;^' "y^"-!' The expenmenls on shnie wetv run on a verv '7'" '^'^''^^ ^" "'■^'- ^'^^-'-t'n^ ,n hot.les w,.h vanous strengths of solution: a ehemieal extraetion of about ,S,S' ,,., he silver was ol.tamed with 0.0- , .„l„„on, with a ehemual ' eon- sumption ol about one pound of potasMum evanide per ton treated ll.en tests were made on a lar^e. seale, usin., eompres.sed air for a.;..^mon and a 0...n^ solution. Hoth deeantation and he .Moore hlter-press ntethods were tried for separatmv^ solution '"":', T'""^'' ';"»'' --- '■'^'->"> ''"t no apparent advantaj^e -u,d he uamed l,y use of th.e Moore tilter. the onlv savin.^ heinj, !h,",n"!l!!':;'"!'..!';:'.;''!.'^,''"''' """ "'^■'"'' "-^'^ ""'l-n.Ht ,n usm^ ■ ■''■"."■ •'■■'■■ 'tiL; uui the quistioi, of roxaities. 1 Me nietals "^■■■^' P'Tvipitate.i on .ine shaving. Hxhaustive tests with zmc- 14 A7-:(/-;\ / ' y i \ii>i- i'i<^< i "■ '• .Ir.st i,ivri|,i!an..n u-rr iml al all -at i.ta. t- .,•, Tm mv p, rs.mal kllMwl-M'.-r llll- "..^ thr MXHI.I ea-r wllrn- ZlIlrahiM ] ,n ■, '1 ] ,11 al !■ .11 „.,,ul,l iv.t UM'-k Willi tluM' n-uil- ior a -tiulf. 1 iiiiUr'l Til niriru !.,ii-lr-iii iliii.ua'lahiiH'.lvinipal llu- lia.i,.n,la Cnil ral . fnti - .vnlratui'.'. -.rparatui- -aii.l lr..i,i Viiiiir, ali.l rvaiii'lm^; llu'iti -„|,aialrh- 1 UM-.l a (I l', -.Iuiimh f. ,r Irariiin- -ami an.) HI).'', tor a-ila'.in- -linu .\i.iir"\niiali 1\ :!."', "t tlu' uiv Naliir wa- M'l.arau-! in tlir l-nii ..f ,. .luviil ralc^ W,' ,,l,taiiUMl an rxtni.MMii .,n -and '-i Mi', ..I llu- -ilvrr an-l '.tT'^ nf ilu' -..M. tn'iii -litiii' wi' I xiraitr'l '.III' , (if ihi' -ihrv aivl "l7''£, ,,1 il,r M,,l:l Tlu liiiir .>t -aii'i-lrarliin- wa- 1 J ila\-, an,l the iMlal Uliir Ml -liirc^UTaUlirnt wa- thiTc (!a\ -. "lu- .lav > .\ whuii wa- aiinr a-itatuin On -all.l. tlir .. .ii-unii .1 mil ot rvaiiulr v- as II 11,, ami "11 -Imir, iniliuliiv-,' iiu-rlianii al 1,—, H "a- a tntlc Ir- llian •_' " Hi l"r Ion ul .lr\- -linir Tlu- nivial- \ww i.n-ipi- tal.-l .111 /.mr -liavini^. A rlran-ui, wa- ina.lr. llir rcarsc zmr was iv.huv.l u-illi -u'li'mru- a.i'l. and tlu- imMurt nirlt.'.l int.. |,;,1],,„, Til.' IV,. I l.ar- .if l.ulli.,n llui- ..l.lain.'.l I'.nlainr.i m ,,,,1,1 2 Ir p.T 1..11 .'f '.r.- in. .IT tliaii llu- assa>'s in.lu-aU'.L Tlif silvrr. ..n llu- ..tlu I- lian.l. wa- n -in . yrv K.n ..f ..rr, -li.>rl. Taking; ini,, o.n-uU-raIi..n llu- fa.-t llial llu- ].rr.ipilali.,!l was in a nrw w..i; i/.ini--lH,\ aiul llial. aft.-rllu- . k-aii-up wasnia.l.-, H was sliiM.r.l I., tin- Slat.- ..f Mu-li..a.an m ndii..- r..ai--,- zm.- with arul, aii.l 111, -11 null.-.l t.'ur Iiiiu- ill ..r.K-i- I.. ,i^t-t hnllnm Ulld liru . it r-.-iM 11, ,1 1,t- ,-<.n-i,U-r.-,l .,thrrwi-c- tlian an al,-.>lutc > lu-ck ■ ,n tlu- w..rk, A l.il w>-i--;liin- inil ku'. "f . ..lu-t-ntfalt was -hi], pel I,. M>-xu-.i Cilv. ,,n.--lialf 1,. Ill--; K-a,lu-.l willi,>ul iv-rin.liii,>; ; tlu- "tlu-r half was iv- .^P.unil t.. pa-s IKil-ii^.-sli. aii.i wa- tlit-n tivaU-,1 with rvani.lt- l,v tlu- a.^itatu.n an.l .l.-.antali. ,ii n < llu„l. In !>.itli ra-r- tlu- nn-t- ,,1- w.-n- ],r.-ripiiau-,! . .n /.in.- -lia-.iii-. Tlu- tmu- ..f ta-alnit-nt m tlu- tir-t .asc- wa- !MI .lav- willi II '-V , -.,luti.,ii; m tin- s.-.-..n.l i-i.^ht ,la\-. with tlu- -atr.c s.,luti.,n. T.ital r.xtra, ti, >n was iii,,n- than U(l',. Tlu-a- wa- n., ti-.,uM.- :n pi-.-.ipitati..n. In L.tli cases tlu- .-U-an-up Ju-.-ke.l tlu- assa\- ..f lu-a.liiiL; an.l tailini,' In o.n-c-.|U.nre ..f thu-.- ,-xp. niiu-nts. tlu- Ml-tani], null at tlu- Hu-t..- aiul liu- rNaiii.l.- phmt at tlu- /mi;c;i./.i I-I.tv- an- l.t-mu iii-iall.-.l. I .ntei-taip lu. 'L.tilt "t nl.tainin.-; m i.rartia- n-sult- niiial t.. th..-.- arhir\L-.l 111 tl'.e lal.<.rati>n- m \\v\un V\l\ atul in LIU . .\i ills an.l tlu- t-xt fa.-t i.ir.s .t.Iaiin-,1 in a.tiKil inillmL; \avtt-' THE ry.\\:i>i i'i<,h a 1/ '-/■ 1 \ 1 //■ 1 /, i '''•'" '""■ 1"'- '"" I I'll'-" M.- Il.uinlt.m'. U.I-, „ir i.ru,..' . ,,„. tiniH'l in piMiiiic ,ii I'astiia. Two yiars a^o ilii' owmis ,,i il;,- Cul,,, mini' installed a i-yan- iilc plant at tluir luuinuLi. 1 am not familiar with thi' rtsults ul.tamr.l, l,ut tli.\ ^.ppc ar tc hv koo.I tVuni the fac't thai tlu' plant i> Mil! running;. Al„.iit uxw viar aj-o the Piivvrrina Minin.u & .Millin« Co. i'm;)In\v.l iiu' to make a inrtallur,i,Mcal examination. Results were hi,!,'hly sati^tario-, . !I4' , of the p!v> ,ous mp i-ill and evani.le annex at .he luuuruLi San Matias .Mr 11 ,a,-uen-oHia has ehan,i;.,d liis /..,/„, j.roeiss to eyanidatinn. aii.i i- treating; dailv al out :■;() ton> ot 'nM..m ore. Tlx Adam. ...nipanv at La Lu/ ,xp.et> lo uxet Hill Mamps wnh evamde plant. The (hianania'o disiriel IS now evanidin- .-j.-.d ton. of ,,;■. dulv ; wiili ihr pla'nt. n.>w pur- ehas;-d and imdrr ereelion. this amounl will h,- merea-ed diorth' to I. Kill i,,,s pir day. Fixi-: (;ri\I)I\'(; l.inuir\ -'7 PMH, The l-MitDr : Sir 1 have nail uitli itiicri^t tin iMiiiiminnat mn mii I'lnc (iriiidiiii,' m Mi-talhir-\ ,' li\' Mi' 1-; ['. W'aiui. dalcd Xuwnihrr _".t, in \-()ur issiir (,i 1 )iTi-inliiT Mi Mr W'ann sa\^, in i)art , "I'"inr '^riniliiiL; lia\ iiil; iirnxcn a |)r(-n(|uwitr lor tlir liii,'liist rxtrarlion li\ aiiiali,'anialiiiii aii'l ivaiU'K- !ca( !inii,"'t ,l;"M .jrr^ " M\ line i^'nii'luiv,', I takf it t hat M r W'ann nirans i ru>liini,' tlir nialcrial to surli an rxtcin that llu- larj,'r>t partirlr will \iv lim ('nnui,'li lo pass l.'O-niisl! Mncn. M\ oxprricnic, Ljainiii m tlii-, iouiil!-\. the Australian loloincs. aiiil Mexii'o, Ira'K mv to lirlir\c tliat m tlic L;rcat niaioriI\ of rases such »iiiL' '^niuiuiL; i.-. 1)\ no nuaiis r^sciitial to srcuniii,' tlic l.fSt ronimn-i lal ri'^ult^, ()t tlu' iiunilur ot \ai-\in>^ c lassrs n[ ore I ha\c iiail oiliiin'. It nia\ lie j,'enerall\ stated that. wlieRver careful elassitie.'i- tion IS I allied out. ,ind al.solutel\- free ^harp sand is dealt with liy percolation, results ei|u,ill\ as c oiiiiiierc i;,l!\- ljooiI will he oh- tained from the sand as from tlu' slime. t!iou,L,di. of .ourse. the treat- ment of the sand will ruiuire prohahh- four to ten times as lon^' as the slinie. In the somewhat rare eases in America m which tine crrinclin^ will show <,n-eater profit than a\cra'^e erushin>,', sand and shme treatment. I am stron,i,d\ m favor of the i^rindini; jian as a eoiii- niiiuitor, 'idle jians in ]iairs are almut ec|ual to one 14-ft. tuhe- mill 111 capacity, are sliv;htl\- c heajier in operalins.; and mainten- anee expense, and are aliout cmedialf the icis! ti,-ited. If used m two siTies stafie j^'rinditii.;, with intermediate elassifieation-- it is prol.al.le that their eapaeitv would he still further incTeased. For slime treatment, cithc'r for true slime or finelv nulver- ized ore. aj,'italion in l.nM,'e. deep. !!atd)ottomed vats, fitted with I-I\l: <,l 'iii,,„iuall\- Th i.rsc rillrr> f\ arc alMiiil II "ni-lialf III. • l-t ^i. l'\ luiin \.irmnn till, ns ,,i th,. \\, 11\ iMlnillL,' llltn "ire- "■'l-t\ lu- lillrr .•iiHl lliiir i^r trralcl, ,,( tli, st; "Ilr-llnnl th,. rust. 1,1 I ti-.utiuti 1„. ,,l,iaini.,l In. Ill thr shim i '|n r.iiHiii Is all n\ \ir\ tl 'Il.ir.l with aljuut •isrs laii an a.l m hill r [MVssi.s, It ,s al "■ ininhii liiiM t! <'|liatr I'X- tllr iiif-tals |,\ aj,Mtati( inK li'iunis ti'iiii th-. . "!'i^I imnirsall "■ 'naliiirnt \ nil n pri..r t(. th,. plT.ltlVt tM .iiss,,|v( ■p.iratiun of tin ),m,I,|-|„ In tl If tn-alnuiit ,.| -,,1,| .,„,i ^j; l.s .s,'i\ri ■•ni'l a sh^'hiK in \rr iir(. |"nsnl,.ral.Ic t inu' in thr suhciit I.< [HTi Illation, tin I'M'ii in siiiiic I I'li'l tn. Vuy tl Ntra, lion ,,l,taini-,! if , rush 'I': "■'■ I'.irtu ularh sil\ir-l isrs li\i-. t 11- tl'r.itllU'nt of ,.] <;ni sanil l,v •■'inni,' niattrial. t »\o, and Ma n.lhn;,' of tl ns Iliad. rial can I thr usf of thi Hlaisijill ajijiaratus. skillfi from on,' \at tl '■''■"""■'";^ Ikim- h.in fouml i-rohtaM. ' '■ fimioniuallx [.iiforni,-,] 1, ■^'•ivaiinu, -list nhiihn.i,'. ami , i«M.i;n(ii plant, saml nia\ I 'n\c\in),' iiiiatrK- anothtf, iisiiii; tin al f nvncil lllO\-,. I! "iif criit [HT ton, ami tin hiiK'fx-, lot- a niouslv mi.V' cx'rarti, 11 ami prohi^ I>I'rox- ■ t'nor- .\s lit Om- an iiistam,' of I hi' fail; I'v of attni if W •"iintfv •i, thr ofi.s of anotl 'I'lm.t,' III fit tlu- nirthoils i-strt-n Australi HT, tna\ |„. Ill in ores ami t! I'lltllllU'll t U' cuse In t hr lornifi cast.., fi raw or,. f,,r the hij,! nc .irnnilinj; is ilist C'ri'ck an al J^lust 1 oninitTrial nu'sh most ciiuallx- i,r,i,„| ,,.,^, as at i.'n(»-ni 'ifi-. or 1 a,t, a loiisiikTahh hi"l vi^h. fitluT Ii\- i >.v snii[ilf i\aniilation of tl ""-y I'f Crippk. Cruek, Colorado, nirtl\- ni'nvssai-v to fit the fxtrartion, whik- at Cripple '•■"""" niax 1„. ol.taincd at 30- romo-i-vaniil,. trcainirnt of raw H' roasted As roasted H-r extraiti ore a t ;i()-niesl i.yaniiie at 2()()- nientioned distriets 1 thf Koid in th 1 than upon tl md finer, T "tl Hiav he obtained matter of on the he raw or. usinj; 1 ronio- las jioints in ei "f ore in l,ot!i the al f material fr ined with telluri- oni the 1, mmon, that is. that "er Ie\els of the mi love- much of nes is eom- [>enver. Colo., f muarv ,S. mkk} ■ODIKKV DoVET o\. i-ii.ri;k i'ki;.>s i'i>;.\< tui'. i\ \\i;.^ri;u\ ALSTi'lAl.IA Bv A. B. \Vai.i..uk ipil.ni.iry :t IlKm Whin llir miiK' opt-rators in WVsUtii Australia turiu.l tliiir atti'iition to tlif tri'atniint of tlu- .ij()l(l-l)<.'arinK slime. thr\' had a rhoiif ul' one i>f two niethoils. iKiim-Iy. tk-iantatiun ami liltiT- pivssini;. Tin.- si-rious (lilticulty was. ami is. thf s to .*i2..'.(> per hundred >;aIlons. At the present time, however l\al.<,'oorlie is am])ly supi)lied with fresh water 1>>' the ■C"ool<,'arilie Water Scheme." as it is ealled. whieh suiijilies about .'.11(1(1,0(10 iral. jier day. Tiiis water was jjumped thr<)U.!,'h a ;}(»-in. main iVom the Swan river, a distance of SOO miles, and is sold fijr al out ."iOc. per thousand jjallons. meter measure. But in oth.er districts he\ond Kalnoorlie, as. for instance, at Meiizies. many mines have to j)ay as hij;h ;is >;." per thousand tjallons of salt water. I'or this reason, deeaniaiiun methods, which invohed the loss of. on an avera.i;e. from Hiid ii> ^An) ■^.,\ . nr miii- hv iwm tons of water |)iT ton of dry slime treaiid. pn.\e.l tou en-tlv . and. in tho^e IcKalities. tilter-pressinj; was almost uni\-ersall\- aduj.trd as the oiii\- jjossihle method of slinu' treatment The Di'line press or one of similar t\pe is .-ilmost uiii\t rsaliv used. Tile pri'sses are sup|ilied with I'ee'l and wash clianiiels ihrouj,'!) lu.:;,'s attached to. hut out.side of. the frame .\i lirsi it was tiie prai'tici' to collect the watt'r from the mill aih r sc]>ar.itin<.,' the '-and and aiiow iju' slime to seltk'. dr.iwmi; off tlie ( I' ar water lo he riiuiiud III the iiiill. The slimy jiulp, in tin- pnipuriinn nf ■ihiiui three 111 wati.T to oiu of slime was tlu'n fi^ried nitn the pre>s h\- meau^ iif (iimi.fesstMl air. As smm as tlie jifess was full the slime w.is 1 fr.iti'il for ahmit four hours h\ puinpiiii,' cvanide soiut imi throut^'h h. In some cases coniiiressed air also was used to drv llie pulp; this inrlliDil. li()We\er. took tun iiiui'li ]iress iapaeil\- and \\a- litialK' i.h.-mdiined. The me! !;od IIcW Ilst-d :-. !;! eii!!!';! '.]m- ■.!i:ii:- U-:t:t\ :]:• •.•.^^.U I- 1 1. 1 IK I'Kh^^ /'/,■ 1, //, /. If) rtquisitr . \ am. I III a \ ,it w II h ni, I ! iaiii..il >rirr,i-., uiih ti iiitMii, in I ii,' 1,1 -Iimr, until all III,. M,,l,| „!,,, I, , ,,„ 1 |'i""|"'i-in>n .pt Iw.i s.,1 UIl"!! \n die ami tli( n lilti r pr ■r-.-r.|. USUI- Ihc lllllT-Iirc'> 11 l'( :^'i)t intcj M)luti..n IS c|is„,I\ .•ss as a srp.ir.il ini; iikh Tl 11' i>ivss<^'s usuall\ lia\f hail tons „f ni tlirif t., tivf aivonlini,' \,> tlic mat iTial, ti'Jiii i>i ini'hrs. The thirkrr the cakc. .,1 thi' trfatiik III Til,- si/,. ,,t th,. ,akr I I'cini; t'n.m :{() i,, .-,(i , ,,1^, ncss (it the lakcs varic iiiiu li as I hi-, II' null t. ' "iirsi', till i:ii ca, !i |,r,s- Tii,. til >pc.-ially uii\,n |,„- ,|,ai pur|i,.s,. ami ,.,Ms a! wliolesalc, sn t hat ■iiitu.mi, al u-^uallv 40 in, sipi ir, , ih,,-,. 'I f 1 lull) Is tnatcrial mil .,(),■ carli , Ini 1 ' 'ists all, ml s| I'lT \ ard at ^ft ,ul iiiti, h "I from ;i() i,, im ,|,,vs | san.l, thr ,|,,i|| ,s 1 alii,, tu ailvanta,i,'(s ,it lilt, i-pn.sMii- is i|„. ]; KuM ami s||\-,.i- u 111, h lati I or tiir, III intn l li,. la- I" '!!'■ tiiaiirial i.ivs>i,l iii'l It has a hie (iintaiiis imiih '|iii< kcr ( )ni 'I li nX'i' prnpiii-ti.i;i i,t" .lissuh,.,! tl lie I'll 1 1\ ,r. w ''' "iHv. then a Ui'ak wasi ifai liralh- ,"(!' , .if i 1 nr \vat,r is tun .1' \\asiiin'' 1^ Ilif'ii-h tl:c shin,, fi-i Mr\- tli.iruii.ih. K'li ilu- I'Ulp is puiii].,.,! li' siilutlnll Is ricnw.ffil ■'■'1 thfini'^h till' ,.ak,.s as tile ^\■at "111 "til- tlltt.f-pl Her pas>,.s li,iri/,,nl IWi i"iis lit wall plat,, til the (itl UT. illllv aliiiui f Iiciiil; n rirssar\" til w an. I ciiu'dialt' tuns ..i ^1 iiii.lir al isii (iiu- I Ik iiiif, ( '■ al.ntii !l(l-||,.p,v.suiv,uhiiiuntrv wiiulil l.,. ah nit ;4 I'sIiTti Australia it ma\- li,. sanl fi.il nil In.al r. unlit piT tun ut slinir, ii,.i„.n,l ifus sii lar^ilN' in " k'ivr an a, riiratc t" \ar\ tri'tii -Si'iO pitniim: im tlir tiatufr nt' tl ii'iis ami iin I lu' tin; I'Vl'lf (it iif 1)1 iiitifcst tl iniii.,ns. The last <■ 'HtUJIUll nrtirci...ssaf\-. it rrijuirtst lal. I'llt lit the ■tftirkiTs.' uli twi , mt s'lN'c a trw ta IS an ini|,(iriant t.uti s I'ifst. with rvi Wdniiii tiiilischar; ir niati.'- m.s. i'iiar''iiu '""'1- '""' "I"!'' 'Ill' "iluT 1^ 1.1111- lillr.l an.l (Inc.L Ii ini,'rr In pirinnn sonic iiiilis, where It t.'iko tvvu iiu-ii eaii handle three |}I■{•s^e-. () attends In the tillinL; and wa-hitv, 1 e\'ele n{ n lafL^e iilant-. t done li\ ' h pfes-men, wdin reeeue al ipefaliun- le >llll'tdMis Ut (III siilallef one, tills is aK, diout .'-;j.s(l he I tin >■ oeeuj.led m tillm- a press depends ,,n tl ^"I'i '"1 '111' pressuiY Used A- a rul piT Miitt I if elL^dit le Illaleflal a pa'.ssuie .it trnin (10 to |(l() p, in from for frmii 1. .'(• to mi tinnute: W . tile pnlp Is loreed under ■ n, aiiij Ilk' press is !il]e :■- 1)1 \>. hiili th <.\ani.|r soiiition, after whirh t ii same as pre'/i. mslv ileseril.e.h <■ slime is fhorcM -hlv hrok treatment, of en in en lip ill course. IS tht CVAXIDATIOX OF (0.\C-K\TRAT1-: l^V l-kAM Is I n,,Hs,,x ^l■"tl'HMI\ .1, HHJl,) It 1^ ,i^rnrrall\^ h,.],! that <;>],] -.s it ,.vi , ^ ,■ '■'ii!i(i, till- iflalnr ass. a,„l . n ■ /''"'' snlntintis, • '"' ' '""'''Mi'-nt ...uhnir ,,,■ In thr case ,,( 'if tlir \ai-iMUs l\t'i'. the (iuc-ti.iti i-- natural ^T'M's a> to i.-,. „,|ul,il,t> ' lUI'lTllccs ot' t 1],. ,,,,., .,1 ., ,,.11 1 " .■^v.«, .,,,,,,,,,, ,,..ia,„,,„, ..„,,,,,,,,,,,, :::,;::„■;;;;'' s :::::.::rt :;:''"- "": - - m- ' '''.-.'■llMIl, t'UI ^IH'i'I'^ '(till, 11. I i ,-. t I sonirttnir^ ,,. hi^h a< -il)' .,'v ,- '"' nu,lnti .nntauis ni' rir^licil l,v )'\.\/i>.\r/ii\ !>/■■ f "\'( !:\ I KA 1 1-: 23 <■■ I itimi'nish extnii.-ii III (jf sir pass a :,() iiirsli Th till- 0.) ,), i\s Willi (I It ihc >ih I" iiiairri.-il wa- tn-alc 1 -"liiti 'II. Ai K( was olitaincl. an extra. I i >r-, ,,( \\\ <\ til t' iiK'tais uiTo prf(i[)iiatci 'f tlie tMta! \-al 1):)X: tl) all (if t I' c lean-up eheikeil uit -^iiie sha\iii" II I tile extraci 111' ■iain /nii- le Zinc was nil 1 'tis I'alle.l tMl- 1 One hunilreil j tnesli Sen lleeil with ac 1,1 Kiunds (if eontentrai >\' assa\- en. were treate. e. re-t,rruui|,] ti pa-~> a IIIO aO.; eyanide solution, f .y a-itatMH in a ivv.,h,,i^ i,.,,,,,, ,,„ , inj; solution daiU the si I the R result. Kranis "" ei.L,'!it .la\s. ,| lie extraiti'in •'I'lntin- aii.l rcn, ver and " lal.oratorx- a>--a\inL; !.'() HI a Id, i-kih an exi'essiv in,!' tlu ni tile eoih'einral.' , iiielK •Mimin. S,i f ~il\ev aii,l l:, witli II. arL;eiitui It i~ •-••■onsumpti'in of eyanide. an,l alt ■xlraeti^m of sJKct was -d ir it d' n.ii sliow er -,\cii ,!a\- or SIX ;v Hi- nil L'U eeks. the Ot the L,'r,l,l [ result with that extraetion i< eaiiiiiiL; is ■>' , of thi -i!\ ,!• ,-in,| SI)' I ^peet a liki "'''.■liiicl in the same t iim: on. (' imparin- this this ma\- wl extraeti.. -eem to 1„. an "lie in tlie HI) ,la\-.- Kaeh 'vith three m,,„,||.s- l^aeh At len you eon^ cent of ider that fr. ■'■'i"i,^'l.\- Ion-- time of Urst '111 ores ill this treatment, hut (■"neentrate 1,\ \\i-v^]a n\ >;i'll|>. less tll.lll on,- |nl t" our e\aiiide mills uill t: ' the ease o; the (i is ■ precipitation ■''' "pinion th.-it '■'i''iia.iu.ito,listn,-t n-ill 1 eoneelltrate fr,,ni .,tli, e less anii-ii.-ilil.. i. •r ores of th- L'l h' /■:(/■:. XT ( VAX//)/.; I'KMIU E. of >>...: .nns..,,.,..,,,!... „ tlu- .x.nuli..,, .a„ 1. ..htainoi, n.v..ssanlv ,au<,. slow,.,- ,|,tiusi,,„ „, sdutinn Th.l„.s, "-.i.,.,i,,f,,va„„. „ur..,„..„tra,.. ,. l.U.lvtol.. i-, <.,,.,..,,, v.,,,.nd.„,,.. as.san,, fun,. f.^ n tl„. .n,u.n,vau.-loadn„, .i„ ,,, „,„at,v ,,.,,,,.1, l,ut n will n-'t la- as Inni,' as th,- Icn.L^th ,,t tnatniont su.nvst^ iar,.r ,.u-t .f tlu. .xtnu-,,n„ wiin. nl,,a,n..l ,„ ,lu. .arl,,.,- ,,.n., ^ -!„n,.a„, Uh.hull^. wmi. n.,,v..n.,las,^ in tile rcLjular clran-up. t^, Ipciaiisf tlu' 1 "lie Hditur FIXE r.RixDixr, Ktliruiiry .1 lyor.^ tin ^'■r In \hv tii>.( ussii.n cjti tl)i> MiLjcit i ■r l»i and jann,-,r\ l'7. M'\,Tal intnvsti n your issuer n.i,' (|ncstii]n> >■ ,L,'nn,lin,- ncTssan- i,, iIk^ \u^^\u'<.\ extramnn 1,n tim ^nn.lini,' iini.n.\-,' aniak'ainati M I'lTt-ni- Nani'lt.' (-■onitntTrial itsuIk nhtanuMi I,\- f (If finiti "" "t thr icrni will 1 ■fiiif .urindin;,'' ]■■ lie ,L,'nndiiiL far anijMil\-jn,L;-. ■M; re \hv K'St m's ^rnfrall\- umlcrstcj,,,! i nimuii.,n ,,t the inill-tailm- thmuoh l,-|)Mnrsl usual null treat nunt I All the partic-, t "iicmtratinn. i,r li.jth IsrusMMii seem Im lie , ,\ eeiindarv ,1,'rnidnu wliu IS apparonilv- not a \ '•piiiiMii a> t( l^\en Mr l)M\,t()ti i'r\ warni adv.i.atr of th iV\ nnphralinn. that it aids ,xt f s\stein. •w install fart then that f: i-fs eotnincreiallx- |.n,litatik-. h faction. Imt i> ,,nl\- SlflllS to 1 ivannlr solution- will viehl the hii^rlu st roni ()nel\ enislie.l niateriaL Tl tliat the tart evani(iin'r. m a V a settled extraetion le exeeptKitis to thi> are ateh- so rart' I'Cjltt f tl t; ■ft'eet of ( iiH' ^^rindinj,' on whuii. iuriousl\- enou,i;h, has I een tl i-eceni ie\-elo|,nients in exanidin.r. as one o anialf.;aniation le axioms (it a suhjeet when ..nial.i^'anialionis used after t he ( irusl into iM-onnnencc In o not know o| an\- instanet ation; aithoindi it iiK- umidin,:.; or slinii m South Afrit is said to ha\- K ii.l; oper- <-■ lieeii triei fa an. I in K,,rea. I think it has l^vn tl H-nee ot milkmen that erushm.; tiner il;:.n tl li sonie suecess cxper- itional :U) le appro\( In the (iollljcdd (1 eoarsest of the M 'ir 4()-nush rather himk.rs -han aids and trad- isinet, .\e\aiia, th (' practice is ti in^tonand Hr\ an mills, T C'haracteristii all\- red, lo release 1 ) or L'O-niesh jiroduct from th amalgamation. re-crush tlu' (■ stamjis in Hunt- and D.J- use of Ian tif mineral mike. Id, d j,i th lis has the effect ,,f kriLihienniL,' tht ^■olored j,'oI(l «f the district, as v.vll ■,. c coarse [lartu ini,' has keen atioii. in r;i>;e ,'(-• anialLiainatinf,' plates after k's of (juarlz. ot distinct advant a,t,v, Mv kelief the seconii crush- is tliat am; iiijam- aiiiaie rea,iii\ and _'ll A7-:c/-;.v7- ( r.i \7/'/-. /Vv.w i h HTi- a--i.nisliiiiy IS 11 i Ii'. may \>v lust in till- i-asf (if ti-e ( itcssarv for tlic hii^' tarrji'il im in iw,) siai K'st uxirattidii >\ i\ an- DinliinaiMii mil •-■sjxcially wY.vx It C liii's ni)i nil (lllrl.l tl U' as f SCCUIllI iTiish- w imi speaks of ■■/idl- ifrindin iKv till' ore tc. fiiur than 4()-tiusli. Whin .M,-. tl:c lii,i,'lK'st cxtraot I' i\cn a ion K'oM ores, amali^'. ainalLiamation ami lit' implies that it i imation. It s now t-onsidrrcd Iirf-rrijuisiti' for lyanidf Icachim,' of in I'ssential to "olll .1 instanif wl n- llltrlTslmi,' t.) kilo \v of tin ii-n-iii tins M o\ <-toli hii/l IirattK'e lias improvnl IS on fine tjrindi spinal amalijamation. 1 ixtniititin as i with sonx- iountr\' an omniiniallv nni 'i.u'. disiivdi tinier i irofitaMf. will |,c i-:i Oro: till' Li!. suri)nsi' 1 in .M •Mr. Hutti'i> li\' companus now usin.!^' tulii'-niil C'XllO. *r\rral SUl'l lis aid to ri-ri-i\iMl in tins 1 mills ari is install r,v Hi in'^' thrill on his .\I 111 opiratiiin at ixuaii ml "nipaiiy at Ti Itiruk' , ( propn-tR.j (onipany at (' ai'iiai-.-ntly at a eost Ki'indiii!,' is a lomn; ihtornia. haw tuK'-mills in <, pt-r Ion which justities their cn-ial propirtii- ahovf naiik-d. in .\ust o|orad(j, and the Stand- pi-ratioii. If line ralia ;iiii| at th I' \anous h;. iVl- I ten Old merits. Oh tiona! !,'rini If si s(i t. will , I nil 111^ lUlL a s_' will viously. the ],rol lissimilar ores, ii ni u> italil eiie: of this ilepend in eaeh ea^ will ■n the niar,i,'in of ^axini raise the extra. iion i.v Ille oprration eo>ls ."() e\-aiiide from pa\ Hut if siu h >■• per ton, lrlan]f,^th■ it It /// an inercase o| saving,' is iiiadi ni SKI -limatjiiL; the val lie ot a pen. in fin so iiianv inherent IpoSSll.le to i,n >. the sii, londition^ t'neral m 'it \\'hii h iini-,t (k e ,i,'riii(linL; has 1 .M\ thou,L;h I eeii soiiu-what happier tlian .Mi- |)u\rt iperieni'e lave not had must aiimit that, while an ad\. on s injL;-pan. W from expi'i-ini. ninl oeeasion until reeentl\- t■ a ireri not 1.,- a wurkitiLf ■Nlirii a I test 11 m this inij.onant -ul.irei hlM\ e itieallv from Mr, 1 ), pkuils resortiiiL; to lim \eion the rases m whieh h ^niLlmi: on a scale Ian Jad to know spcr- e met Willi failure ,'< enough to afford h'lM: i;ri\iii\<;. nliaMr .lala Smli mtnnnatioii U(,ul.l I,,' ,,| s,,.,ial \ah:r at tlu' lii'i-^iiit tunc. In th,- trvatiiam ,,| mK^.,- ,,ivs !,v i\ani.lcl am .It>.jM ,scm1 '" '•''^>' •' '!ii'l'll<- LM-ouml I ( nwni ilu- cxi nir.f \i,'\vs \:vl\ !,\- M,- Wann an. I Mr I),.\,.i,,n .\i^ilali,,n ,,| tinrl\' . hisIkmI s.Ivvr u,vs t-r tlu' Inn:; ,,rri,..| u.uallv r,-.|„nv,l t, „■ llir l,rM .xt ra,!,,,!, is ,„ must fisrs nrillirr|,ra, Ural. !<■ ii,,r rruii.,nnral. In li;,. trratnuiit "' ^"•■'' '""•■^ ' 'i''^'- "I'lainr.I the Lot mnini.-ivia' f, Milt. l.\- :v- i;ni,.lin,, f. a liiu- .an.l ,.i(l ,,;■ s(i nv.lr an.l Ira.lun.^ tin. [,P.liu-l tn.in I.", lu 211 ,!a\s, at'cTa raiMul m ].arat i.,n nt tl,.- -!in r Thf l-uiv -Iin.r, l.v ivas.,n .,f the t,,u' Mate .,t .ln-,s„,n uf tlu' nnn, ral d.H-s n..t HMiuitv ni,„v than ihr.r .„■ I..iir .lavs' a-itati..n U,y tlu- I'lSt i"i -nils ■Mr, l).,xvt..n wills liii:,|\ att<>nli.,n l., tin- I^lai-.U i! apparatus f.ir .nipt Mil- an.] Iillin- tanks, an.l |,.r carrvm- .an.l tr..ni .,11,. tank t., an,,il:rr. Tl... „:, rus ,,f tins svsImi, tn.n, all |..„nts ,,| vi.'W «riv tru..l tm.l |.i-.,vr.l at the l^attel■s plant at \-n-niia Citv ' '"" "i'"ni;,..l that tu,. lai-r . \an;.l.' ph.nts n-.w ,„ ,. .urs,- i.f Mv.tL.ii 111 Mexh.. aiv I,, h,. r.|uipp, ,1 uiih tins apparatus, as uvll as th.' lU'W .-,1111 t,„i .■..aiu.lr plant ,,f the T..n.,p ,h .Miniti- C,,, at T..n.,pali. .Vrva.la. In .hstri.ts wh, iv \hv pruv ..| lah..r is' i.n.'h. ..r whriT rhcap lal:..r is uiuvrlain an.l unrrlialK'. as ,n j.arts <■; .Mrxu... tin- N-ahic <,f iiUTlianisni .,t tins s„rt ,s in.ahulablc, Thr r\-..luti.,n ..f sltnic (iltrnn« is .,nr ..f tlir tr.,st im.nvstint; ut rcrrnl .K'\vl,.pir,rnts Filtcr-iuvssrs sxvrv nr\rr p..pular or inuih usc.l in Anirru-a. The M,,.„v pr.Hvss, at first nistallr.i at \hv C. .1,1,11 (lati- null at .Mnvur. L'tali. was s, „ ,„ .li,srar.!.,l. hut was latrr iiitr<..lu(f.l at thr Lundl.cr- cV [),irr mill at Trri-\-. S..utli Dak.jta, at the Lil.> rt v Hi'll mill m (.•..h.ra.i... an.l at the Stan.iard C.j s mill, at li,„ii,.. .-aiitnrnia. At all ,,f thrs.- pla. vs it is said t.. h^- ..prratinK su. .vsstuilv, Cassrl mt r..,iu-. ,1 an iinp,.rlant m,,.iirirali..n <.t tlu- .M.,„iv i.lt.n- l.v prartirallv ivvrrsjn- the npcration. that is. o.nxcvm.i,' the pulp an.l tlu- vancus s.,lutinns t-i a Ih.x carrvin,- stall, mar\- (iltcrs. mstca.l ..f sliiftini: tlu- niters, as in the .M-huv s.lu-nu-. The merits ,)t these tw.. tvpes .,t filters' w,-r,- thoniu-hly invest i.^jati-.l at Virginia Citv. wl„-r,-. attvr .sev- eral ni.inths ,it ,juKt an.l < anu-st w.jrk. the Hutters-Cass.-j Miter. s.. ealled. was finallv ev..lve.l. This is n..w m use at tlu- Hulters j.lant. where i:,(l tuns of slinu- p,-r .ia.\- are l.eini: tiltere.l at .-; cost ot 11,'e, per ton. The svsteni is v,-rv simple an.l w,,rks 2x Kl-A l:\ I ( \'.1A7/'/-. I'K \i //( /,. with a o.nviii. ,„w s„„„,il,n,'s. an.l i.nri.iM,, ul,i> h appral ai n„cc to Ilir practical CSV Ai the :.,i;i ,4 the Cntnl-matiun .M,n,.s (\, '" '■"I'l'K'l'l. tln^ prM.v-,s IS l„.m- iiisiaHc-.l I,, tivat ID tuns ,,\ hi.u'h-.:;ra.k' shin.^ p.r ,hiv Thc^ tih.r-prv,, wh)rh has !„.,.„ ,„ scrviu' for scvc-ral months will !„■ .lisrank.l a^ tc, cxp, nsn.' m 'ijicratc' l"iv\\l|N 1, Bmsmi I San I'rainiscci. |aiiiiar\' _'7. I'tOO. FIX!' C.RIXDIXG Thr I uiiinl.iiiiuiis lit M, s^|■^ Hi.~i|ui ami Dnxctcii ,,n tins intcroimj,' suhject nii-ln to elm! furilur usdul >ll^.^^^^j,,tl A k'W ilutinitKHis, MI- at Ira-t , an a^rri iiu'nt as to the pn ( isc- nuaiiuii; uf tlif ttTTiis (iiiplMM il, niav pn M-m i nnt'iisioii Mr |I,.iir\ Luuis. prutrsscir (.1 niininu' a! llic Durliam ('nllr'^c of Si I'.iuf, lia> >ui,'- iiCSlvl that \\r llsr sprrjlic tiTins to drsiTllic the variolic statues of ,L;nii.lin,L;. hi-eakiii'^'' to l,r eontinni to loarM' l.nakiiii; of rrudr otv: ■ini^liiiiL,'' tor sinahrr dniNi.m li\' picssiin' or mipaet , X'nnd mil' f"i- . otiiniinniion l.\ altntioii. Thi' idea of teehnieal Iitiik is not to iiiMnt new or hi'.,'h-soinidin<^' wonis.lmt t.j ,,eiure precision \,v KIM"'-; mdiMdrial word^ a parti, ular diit\, ■Re^nnduiK' and 'sliinin-' are olten use 1 interehanK'':dily, hut the\- do ii.,t refer to an identual pnne--: re-'.,'nndin.t,' i; an intermediate operation whuhotien im-cedes the hnal reduction to slinie. Two separate lirodtuts ar.' made som. -times, as m the e\amclation of sil\er ores, m the ! Wo operat lolls referred to; m other eases onh' one |iro.l- uc I IS ohtained I.v a two-sta^e proeess. .\s to 'sand' and ■shnie', we ha\c' had a ycjod dc-al of ,le\-er disseetion of these term.--,: the last word of precision was >aid when slinie was de- fini'd. l.e Mr, A. \V, Warwick, as a colloid h\drate: 1,ut ihisisthe chemist s not the imllman's point of view. To th.e nnllman, ■sand' and slinie' exjri-ss a condition and not a tlieor\-, I'ornierlv a pnjcluel ot extreme puh crization, so tinel\- eomininuied as to he unleachahle, was eallecl -slime'. Hut wi- lia\ c ilianKed all that; Hltt-nn,- has heen so de\elopc-d that scjlutions eaii he foreed throu-h maten I once regarded as impernu-ahle. and slinu- is willtullv made he-cause the extreme suhdivision of particles which It n, ■■■sents is favorahle to luiick solution m the presence of certain chemicals, .sucli as potassium c\anide. Slime is no lon^t :• an unlc-achalde product. \Vc- Iiave returned io the old cietinition which clejiendecl on sizin.c;, and for th.e mo ment the arhitrarv limit is |.")()-mesli, simjilv ht cause that decree of comminution is found hv practice to aue the hest results in the [iresencc of two i-conomic factors, the cost of reducintj the size oi uie panic ies an.i tti,- time recjuircd tor solution ot tilt- precious :{!) KI-' l:\ I ( ) W/DI: I'K \t I I, /, tmtals I'mU.ss ,„a^lr s„iii,u,ulx Miiall. I l;i' i-yani.k. ranii-.i ^ft at th.' i^.il.i .luaM.l m tli, ,|uan/ M, ,,nu-hil, San.l' .Mntimifs t'> \'r \hv granular pn,.!,,, t, uitli sharp r.l^v^. ,,a.l,N pnvulal.k- l.y solutions. Tlr i, ,i.|,n. v is t,, .l.iTi'asr 111,- pr..p,.rtinn n\ t!iis proihict l,\ iv-nii^lMi- ,i i,, i|i,' ruiisisinu ,■ .,f slmi,-. S,,, h •san^l- whrii iv-,uMnun,l i., |.-|Mnrsli ,s ,„.i M,,,;,.' i„ ti^. ^-v, s ,,t a niun.si..pisi. I,r>ans,. li,, pait„lrs aiT sharp, tlicv aiv net <-.)Il.)i,l; \.u\ \hv ,\ani.lr , xp, ri uhn kn..«sall ih.sr thin-s. will call this pnuliKi -shn;,' iiisi as in, ah as thr , La\ nr ,iiu.! proiliuvd III Iht' trst instaiirr iron, ih,,. s.,tt al,ip,ni.,us ,,r tr|,l,.pal liir roil- stiturnts ,.1 thr urr. It ,s 'slm;.- lu him h> . avis., he u'invs it tlif trrali.i.tit al!.,lr,l lu shti:, , 1„ <„hrr uunls. sati.i an.] ■slmir" aiv two tiiill pf,„liMs . thrv arr ,„„ las,,] ,,„ nuc- , hrtiMral or physn-al (l.stinrtiutts ami ih.v srrx,- -luir pr, snit purpusf. Anvthtn.L; tmrr than |-(ltn,sh is ,!„„,■. atnlhmL; ...a.-M-r than lllll-nirsh Is san.l. anMhui- l.rtUTrii is an a,,i,|riitai li\ -prn,iiKt . ' ''■^'''i "'1 l'"' 'nic s,„.„ti|i,. .listin. tiMii. \\r rxpr.t to st t- "■'Icil a- i\aiiiil.' jira.ticv \v''<<\v.vs funh.cr .lt.\rl- 15.111 these t( rins (ii<;( ,• i-i.\i-: (i id XI) IXC, I l-i I nr;ir> 17 Mini. Till' Kdiiur ; Sir As one who^c i'X])i'rii-mt' in oiv-i,'nnilin},' Iu-;,'an 'Mi vtais a«o ami who sul>si(|iKiitly lias l)n.-n almost uninti-rniptc-tlly assoc- iaiol nitli it, 1 am ]ikasr(l that intcn-st siinis to he taken in the ]«iiMu- liisi-ussion of the siilijcit. It is he lioju'd that a gen- erous spirit will ]iri\ail ami no liitteniiss enKemkivd. With some ores, values art' prettv well released without \ti\ tiin.' eoinniinution. while I helieve that we of the Unitid Males have generally erre tloai ahoxe W'v larly evol\( d tic pan. uitli a faster ir.oiidn. to ^vnil as well as toanial.i^'amate. l.ui in thi- i here is no scstematie .sek ctioii of the particles ninst needed h. p;is> tie '^rindiiii,' surfaces. 1 he pan served tlu' purpose when we kne\v- no luttcr. and stran^'e to say it still. li\- sonn-. s(enis to 1 e ennsiiUrcd an ccommMcal .L;rinder. More than L'd xe.n-v ;,•.;.. 1 d( p;irled fi,,i;i ! h,-, practice I,v imro- ducin.i; sjiccial .unndini; pans m wiidi ili, pi.l], | a>Md mice iii!.'i r a muller having a -olid rin.i; di-e and tlunc, mu ,,| il,e pan to another of the .same kind, if liiici- pulp \'.a- de-.n-ed Thi-c weiv dccidcdh' letter and iiinrc eci inoniical than the ;in:;il','aniatin,i,' pan. ummI as a i.;riiid. r. \,t thtv were not a-, i liic unl and desir- aMe a> a u'rindcr .ad.ii.te.l -■ une Hi years a-u v.liieh wa- (if lie old l.uhr-stniie (Iwiu-^nrll t\pe, made eiitirelc of ii'etal. and run at a ili.l,'ll speed. W'l-.erc the li.>lt..in ,1i.m' re\-ol\(Mil-tcad uf l l;e upper, the sand p.anici. - rotate lelter 1 ( Hveeii the two discs at the period of erushlilLi. .-iii.l .so cut il:e iin-tal to a less extent, and also the cruslied ii;,rt i.le-, p;i>s iroiv i|uickh- awa\- Un- douhtcdh- no ni.'ihod of ■^nndiiu^ letwcen two parallel surfaci's oi metal c;in surpass this simple ;ind ;ilniost iirimiiP'e de\-ice. and the cost ol it is ]irohaM\- less than that ot" am- other machine ot like caiiaiitv. \'et .all i^rindim; let wceii iiarnllel surfaces un- a\uiuaoi\ iii\oi\cs eoiisiderai'ie loss of siioe an>l 'lie metal. .{J KhA l:\ I i ) .\\lhl_ /'A' 1( //, /. Fow.T IS r,„,s,„„,.,| t,v ,1,,,, ,,. ".,!l ;,s l,v anv othf, inrans "' "'•''^■"'^~' ■' li;"'l "re \rrA iin, Wli, n ,„„■ .uiisidiTs tlir scjuare surla..- .ma .,f fU-ava«i' nn.,l\,.l ,„ l.nak.ni,' a !..„ , ,f „rv to pass a -'iHMiU'sh Mi-c-n. tlic i„,u,T nuchcl, uni„,iii alLiAin;; lur loss m :;s mcihatncal a! launii.-tit . ai.|M'ars iMnin.laM.. m rati., with t!„ liar.lihss ,,,i.| iMu.^lm,.^, ,,, ,i„, ,„.,. ,„ ii^,,,, j, .^ ,.,^|jj rul.c ..t rn, k wi-i-luilK "'H' ton is iiit mi,, .uli,-, in. a-nrmi; ' "f .,iu. iih li, n involves a rkuvu^v al a|.,,rox,uulelv I.V(i()n >,,i.ar°e (vet ; v,t II a sanipl,. .,„iM \.r ha.l s,,ldy of sudi small ,ul,es. It wouM app.'ar as fnic sand aii.i nm as slime. It n ,|ui;, [.roLahle that a pulp that lias pass,,! a L'nO-mesh sereen uouM iiiutv nearly reptrs,.„t thive nv |nur tim,-sthe aforementioned area of . Ieavatdu [-"ram is, ,,, I", himarv IL'. I'.KMi. M F' Hoss. MiLLi.w, \- sMi:i,ri\r. i.\ Till': tri-atmi-at ol' ToXoI'Ali C.oLDFIKLI) oRI-S 'MarLh :tl I'm., Tlu' report that Mr ('li;irli-> Si hual) li;i^ iiilm.l intu a -.mfl- tcr ioiitrai.1 for the tn'atnirm (it lu^ .\'(\aiia urc rai-'s tlir c|iii-^ tion as to Imw tar suirllcis I an iMiii|.rtr with 1., al iimIK iti the trcatinnit ni tin- .ili, luus ores <,\ lln' ^uiithcrn .\(\aila (ii.-,trK!. I lia\c Im-ii lor xmu- imu- ni the Mpiiunn ilui! tins m terestillK' tU'lil 'Iocs not ottVr an 1 II, Mill-am iil; ]'ro>pcTt lu tlir smt'ltrr kt.'iit txp,rinu-nls lia\c shown inn. 1um\ rl\ thai 1 hi' rrpn s( iHalivr ..re ..t tin- 'I'dnnpah-I ioldlichl (hstru t not im Unhni,'. ot KJiirsf, the hiKliiT s^'ra'K' siKcr liail ore of the oiithin^,' vountr\ ran It handle. 1 l.\ inodern niilhproeesses to tar helter adsanta'^'e than hv sin, It mi,', al the etirrent lr;ii,'hl and snielter rates. At ('iMJdheld. at the presiiit tiiiie, it Is iinlike!\ that the smeller. e\eii With imieh reduced rales. , an hope to eotnpete with the pheiiMinenallv- lii^'h exiraetinii ohtameij from oxidi/.eil ore at the r. •■•' nation .Mines Co.'s mill, the onl\ millmi; plant m the (listriet in eontiniions operation I'roiii ot her proprrties at I "lold fiidd shipment are heinu madi' Im the snielters, but onh heeavise of the laek • .i et'tieient fediution plants. .\ lar^e an.i pii t iiiesijne variety of small enstoin miUs have hedi m desultorv operation at fioldfii-ld for a \ear or more; hut these haw heen ham|>ere(i by scarcitv ot water, in some instatiees li\- laek of lapital for pro- per equipment, and possihlv. l,v unskilled mana,L;ement . The lively eompetition hitween these mills has resulted m the ad(jp- tion of ridieiiliMi .'tit ;;o inii .'.( Ill ti/. ', M 1 7i(i l|< ID 1 1 .'i til 1 7i)i 1 7 1 ', 1 7. SI'M 7s :;n ;i:. I so J I'l 7ii :;i.' Ill I,; I .'.n .",.;i 111 iijs I l.'i 7J1 70 .■;ii Hi _'iii :;.M 1 1 1 .".:, I li-'l 71 I llnvj Sl!iii]ini..i •Jll ,„ '.HI .")ll III |i."i _'l I l-reij;1u rate lr,„„ (;,,l,ltiel.I to sinelur. S:.'-' ^er ton lor orc-s a.s.aviin. $:i(M)'',„r ,'o„ ^' '"■'' '""• "'"' •'" '""■'•'•••'■'^'' "'■ •■!'; f'T valuation al.o^,. Snu-lUT .I,sr.ann. S| |7 per oz, of j;o1,l for or^- as.savini; un.kr 17, .,y ../. snuh.r.hsomnl. Ml ti, ,„roz. ol yoUl for ore a.savin« :{0 oz. and ahove SI per ton hau!a-r tro,„ „„„.. ,,, ra.Iroa.l ,K.,iot; S:i p.r ton . o.t .,( sacks and sacking;. It will Ik- seen fn.iii the aliove that at the Combination mine tt is nioiv prolitalik to mill than to shiji ore ninnin,!,' even ■■ s liirji as .S()00 p, ,• ton. assumin.L; an extraction of !iii' , .\nd. in prac- tice, ore of tliis Krade is heini,' u.seil to ■sweeten' the lower ^M-ade material to make a millin},' pr.,duei of al.out .* oz. jrold. MILI.I\(, I ^Ml-.l.l l\i,. 35 ll sIiDuM lie i'X])1;iiium1 in this (.■onntitioii. aiiil with rcfiTciu't.' to tlie ahuvf talilc. that inilhni,' costs aiii! lM>sr-- wmilil lie still furtluT incrcaseil hv tlir aiii^arit \er 90', wmiM very eonsidefaM;!- raise the ne' rt-turns fr(jm niillni;4 The t'lHnwini; re; nrd (if a w nrkiiiL; test made at tl;e ('i)ni- hinatii)!! nnll, nn euinparaiix-elv hi,L;h^.L,'rade ore. has a litaring on this point : Tons treateil, aee()r,ind and shme is mdieated only on the basis of earoful samplins; and .iss.ixini;, as it was not praetiealile to make a cyanide eloan-up from so small a lot. In retefcnce to the o.\idiZed. Cioldtield on-s. it nia\' !ie stated that Ihey ai ]Kciiliail\ adapl.^d t(.) millmyc The -old is free. but most of It is so (\ti\niel\ fine that it dots not readih" aitt- alj,'amate. and a comjdeie cxanidin- ccpiipment for handlins,' hoth sand and slmie is a''Soluteh- essential. The sulphide ore al th.e Comlim.il ion mine \ iclds to a S(jme- wnat m.ti.'rcni trcatit'itni . in v.iii> ii i i.iiMnaie pieioiniiai \ '.onceu- /\7-.( I- XT ( )\\/ni-: I'K \i /!( /•: "■'"'"" ''■ ''•^' '■'1"-' fr.-ilurr. f..ll,,uv,l 1,\- ^'xamdiii-. TIk- small quantitv of roiuvnlratr i^rn.lu.v.i t"r-.iii tin- nxidtz.-.l ,,iv v,ill he tivalr.l l,y oaiii.lr, lUr >ulph:,l,. ,. nwvn\nav. ii.Auxx r, does not yidd to cyani.lc. and will „.. d..ul,t cvminallv !.c dilnnnatcd. The Tonu{)ah urcx, whuli ram- iiuu li sihrr, as nvll as man- .L,'an«.'sc. a small qnantitx- n\ m^^n^r and ..ilirr l.asi-s. nx^iv i,,r a lull- time .nnsidtrrd uiisiniaMr fnr iinllm,':. This ^•i,.^v is no Ioniser ludd 1,-y the leadin'^^ mine mana,i:er-. Tests now I.nn- made on a representative Ton. .pah ..iv at an .,;v trstm- null in San iraneiseo show that an extraetiun ,,f !l(i', |,v a e.,m!,i„ati,;n of eoneentratinii and evanidm- niav reas.mal.lv l,e expert, .1 m a projierlv- ..quipped plant. Tlu' nrr m .inne s p", ,,, 1„. the average value "* ''''■ "I'llnv-; nrv iii th,. diMn.t. an extraeti.ii, <,{ ilU' , and a nnllm-; en-t ,,t s.S p^r tnti , ,„ a 4(l-.ta,mp haMs, we hax-e a total milliiiK expeiiM' and loss of ,,nl\ S-| :,() This would he sliijhtlv mereased Ivthecst of shippin.t; the eoneentrate ; hut e\ en then the eost would he sufHeientlv low to diseoura-e Onpp,,,,. and smeltin-. And it th. hi^h-.M-ade .„v of (loJdlieM ean 1., '^noiv prolitahlv nnllrd than snielted. thm the same rulr should applv ? ' ""-' Tonopah oivs Indred. ever\ pivsmt indiration p,,:nls to the distmd advanta-e ,,f milhn- ,„,.,. MiidtmL; as api.lied to the siheious -..Id and sihar o,vs ot tins whoK- nrw dist r,e'; ; and with the ,!evelopn,rnt of a heltrr watef-supi .1 v '"r nnllinu purposes ih.-tv IS no r,.ason \^hv evrrv propmv of any eons..,,,,,.,,,,, ,„ soutlieni Xexa.ia should not have Us own inresentiii- :i() per cent. The total resnhie from the eompam 's works hefore startini: tulie-mills a\-era,i,'eil 1 , (i(i dw i . . now t he\ have come down to 6 i: I ■/<.{( 1 l( I: stoj),,,.,- l.,r ropaiis. I; , m .^u^^,, ,„ Padnua an.l ,1,.] tlir work- .K'scnlr,! t..r 2:\ .vnis per t,m. Clnlran nulls Ikuv Inn- l.vn m us.,- at PaduK-a. fur they arc K.^itiinatc .k-scvn.lants ,.t the airastn- nevvnheless. even the Spanish engineers at that ancient niinuu' t-entre are usin.i,' Ahhe tuhe-niilk. >,, that ,i is evi.Kni thai we shoiiM s,...n he in poss^^ssinn . ,f valuaMe ,lata. seeinvd l,v makm- tmstuorthv tests hetuven the vannu. niaehines emplove,] l,.r re-.L;riii.lin- IR<)\- \- W()i)\) i-nR CNWXlDi: iJCACl ! IX( ; \-.\TS li^ I'kAM Is I,. Mii-ijii A; ■■: I I h)i:i, Ti-A' lollouiiiK facts in rc,t;anl t.) iron ami n,hv.).),l kaohing vais fur tl'.f i-\aiii>k' priHiss will (k-tfrmino wliirli typt- is I t-st III use 111 a ,t,'i\i n Imalitw In warm I'uuntrics. wluri' tl.c wintirs arc nut sc\uv .;. -u-ii tu r.-<|uir(.' housinK the plant, tlie in.n \at is to Ty prcfinvd. Iron \ats aiv inori' fxi.cnsive in firs', i-ost ami cnition tl.an ivd- woo;ht test, as leaks are .iitfieult to stop, ispteiallv m th.e 1 uttum. aft( r the (ilti r l:as ui.ee I een lai.l. A serious uh- Ketiun, rot -inerally re eo-jnized. is the lack of riKiditv of iron \ats wlen under pressure of a charge of ore. and the temknev <>t tl:e peril, htry to shift from the line of tlie true eiriK . This shitlin.u or hul.iiii'K „iii ,ake place durinK the tilling or after solu- tion IS ai.plied. an,: is due to tl:e charge not leiny uniform in .kns- ity and of varyin- i-rcssuiv :.t ditTerent points. Such a \ariation. with the consequent \-iel. s i-a\e heen reported of losses from alsurpli.jn. I investigate.] tins p,„nt 4U A7-.( /-..Vy (VAX 1 1)/: /'AM( ■/■/( /•; ^f\-iTal \t^ar> a,t,'(.. Tlir ivmiIis .,t thr ir-,i^ iiKnIr nu that .»va SKin aiT (juwtrd liciTwitii Initii iii\- art nl.' m I lie l-.Ui^nhciiHi:, ,uui Mliiiiii: Ji'imuil (if l"cl,tiar\ Jti, Isfis A pifce ,,t iT,!unu,l .-, It. ■_> in l..n- at, I 2\ m thirk ua> suh- nuTUfl t..r tliiTr v.vrks 111 a -nM >..lutM,i at Hu.li,- W,-i-Imiii iH'fdiv aii'l att.i- Mil.iiitTMMn >!i.,\vim1 an ali-. irptimi ol L'sj II,. m M» li'- ■ '-'l".-'! "• 1'-", -f thr ..fi-.na! uvil;!]! A.sMimin- that a vat Wfiyhni- SIX iMHs A.niM ali->,,il, ,,^ mii. h as "(l' , ,,(' a S;." cxanwle solution, ih- al.sofptiun \ynuh\ aiiiMimt t^thivf inns. ..r Sl.i an ahiin.i iinpir^vj,,]!,!,. Inss m a punit IrcatiiiL; sr\( lal thuusan.l Inns !»-r iiiiinlh, Annthcr \\a\- tn ac.nunt tnr |n>s nf <,'nM 1,\- alisni-jiiinn is 'n assimir tital \V.v aiism-pimn is ninuihitixc lh,at is, m a l.a. h.uii,' \at suliiniti,-! tnintcrniiitrnt mniart with snlntmn. the ,t,'uM is ,k-- !'"suc',l mthc \v,„Hi !,\- a s,.n,.s nt' pan lal (■\a|iiira!inns, To.h-trr- nitn, which wasa>vnnipani,'.ll,v thr L^natrr Inss l.\' al.snrptinn eoniinumis nr mtcniiit tnit ...ntart an.l whcthrr ruhcv was iv- sp.insil,],. Im-ain- . nii-hlci-aMc Inss. thr tnllowm-; trst s <\vff nui.lf : I'lVst scrii's (t'nntiiuiniis cnntaiti. '•' -^ I'l^'^'l' <•'' 'Ifi'Ssnl I-imIwcjoiI, thnmu-hh- srasnIUMl. wct-huiL: -' 11. -2 MA an.l ,-xpns,n,- IM) s,, ,n < as!i 111 a new assa\ -iiuiflio. Thr ash was rarrfullv tluxr.l, cuprlr.l. an.l thr I,iitt,,n wn-lir.], with tlir fnl'nwmi,' rrsults, sil- ver !h inu' xahir.l at .",(). pi'f nuilrr: Al-tlKll ahsrrpni 111 Alisoqitmn |i. r tini , .f w,,,,,! Vahu- al.srrhtMl ].rr t.ni ..1 \\o,„l (...1.1. Silvvr. T..t.il iiii;. 1 li.') L' 7."i ) III .^r.iiiis 1 .'i.'iL' J .'iss I 1 4 SI il.i Sii (U SI 117 (I't A pirrr of Sra.s()ii...l .livssr.l jiiiir wrii;hinL; H Ih. and rxpnsiiii.; IM) s(p in, nf snrfarr was snl.tnrri;..'.! a! tlir sanir tinn' as thr rr.i-.vnnd an.l snl.|rrtr.l tn thr sainr romlitinns : Actual alisi.ri.ii..n Absrrpr.. ,;..•,.. ..f\vo.;d:' \ aaif .il.s,,rln'.l prr trii .it u..,,,l . <'-.'l.l. Silv.r, T..|,il. ini;. 1 , -J (i 4 :i .'ill- i i:;:; i 7:;;i j m,,; SO T.'i S(i OJ 50 77 /,V"\ :■ \V,u>l, /.,.A' /./■., 1( lll\,, 1 .I/-S 41 (i-i A pi. rr ..I n,uuh pin,. uvJKhinj,' li 11.. 7 nz. and fxposinjj H-1 s,,. ,n. Ml Mirla.v '.vas lak,,. tVun, iIr. lH,tt.„n of a .JiM-anled -scrccn-tranH.. whid, had 1,...„ ,„nsianth a„d d.nviP, expos,.! to a stron.t; solution (aNvra.i^n,.; s:, ,„,,- t,,n m o,,Mi for a p.nod "t .i.i^'ht months, and a-am tor a p, rmd ,,t In,,,- n,.mths : A.i„;,l ahsorpti,,,, ,.'-"■'''■ •''''''■'■''• ''"""^'- A.,s.rp,,,,n, I. ,,,„,,..,,.,,::::::: :::::,,:- ;„ ':: :, f|;;|^ Sit. .11,1 srn, s ..t tisK ' in t , runt I nil ...niart.. (ai A ,,i,.,v oldiTssc.,1 ,vdu,„,d uvi.uliin.^ 2 |1, 7 oz. and cx- P-s.n^ ISO .,, „,, ,,| sumuv was snl.H.t.d t., mtc rniittrnt sul,- nHTs:,,n i„ a .tn.n^ ,„M .„U,m,,„ f,,, „„,,. ,,^,,.;^^ -j.,,^, ^_,,^.^. was 1,„ ,„ ,h,. ,„,„„i ,,,, „; ,„. ,„ .,^ ^^_^_, ,,^^,^^ _.^^^__^^^^| ^^_^^j '''•i.d 111 111,, .un l..r ihf other (j-ht hours : •'" '1''^" P">vs nt n.ii-li i.inc, w.i-hini,' toi,a.tlu-r :51!, 4 oz ^'"'1 ex,„,Mn, .a,li I(l(, s,,. ,n. ..t .urla.v. uuv taken fn.n, n.^ar th.e to,. ,,t tl,,. ,l,Mi,--,..l s,n,.„-,n„nr tn.n, th.e tr,.l,I tank This portion of the ,V,.n„ Pa.i ,,,,„ alt.-rnat.lv expose,! and ,lned '"> i-' innnths. an.l was pn.haMv ahout .me half of the tune un.ier sohitioii : Aetiial ahs,,ri.ti..n .'i"'' ^''''■'' '''"'••'• Ahs„n,„„n,,..,„;i„r.„;,„,:;:: : ^^^ •; ;„, ^7 .,, , \al,u. ,,I,s.,rl„.,l ,„rt,.n ,,f w....,l .^.'rT si, j V i", ;'- I' "lav 1„. n.,UMhl,althep.,n,..n.,tth..s..reen-fra.n...ul„eeted t" l..n.^ .•..nlmu.ni. s„l,„,ers„,n sh.nve.l Ih,. hii,.h,.st al.s, .rption — -■■' •^- .'"■'■ '"" '" "'""' ^"'1 tnat the pu... .,f re.hv,,o,l exposed ■•"-■nn.Men,lv„,.-.,l„,,.,„ f„, ,,„,,, ,,,,,,^^ „i,i,,at,.,i ahn..st the same .iej^ree o, al,s..r,,„„„ .. ,1,, to,, ,,„n„.,i ,.f „,,. s, fe..n-trnme exposed for several ni..nt!i>. The in.lu.ati.ms aiv that ,n n., .as.. w.,uM the aI,s.,rp,,on he '"";- "• a ta.-tor ,n ,,,1,1 losses, evvn ,n a vat of unpro,e.-te,i '•w^^-wim Till- ASS.\\- ol- ( \A.\II)i: SOIA rio.xs l-!\ William M\r,K\.\r . (AiTiI I I Mill'.' Aliiiul a M'ara^ii 1 lui'l "i.a^uin in ^rari li tnr an i-xtra rajncl mclhoii lor ikliTiniiun^ nuM m tyaiiuk' mill Milutum.s. to In' u^r<\ in (.ontrDllini,' the ojuratidns nt an ai^'ilation plain which haii'lliii i-'har^^fS lit Mid l^'us oarh. 'I'lu- prmr^s inxnlvrii spc^iial cluiiinal tri'ainuiits. aii'l washing; !i\' ili'i-anlai i"n , aii'l a ijuh k ^hIuIimu- assav \\a^ iinprralu r rii^'ht thrDuyh. As a KaMs. 1 :^at In nil linni text -111 II iks aii'l lilr> lit' I iu' ti'i'hniial pnss all sui;i,'i.-sUi uls alnnK tln> Inu , aii'l iriril l.ul a irw Itfon IiihIihl; nnr which, with Snlllr nil nillua; 11 Ills, aiiswrrnl Will. J! ina\ mil rest ex aiii'lcrs tu kimw this iiHthinl, rspniallv as till \ iiia\' haw- hail tin- same ilisniura.yins,' uxpi rK'nii' as 1 hail with thr inrthml as piiMisliril li w as ik'siTil Hil in I'lu' Iuii:iiii\'i iii^ iiiul .Minnii: h'tinhil ' .f M:ir,ii _'s, l'.t(i:>. I.\- Altrnl Chuliicv , m siihstaiii !■ i; was as tiilln'.'-s Ail'i in tmir assa\ -tuns nn- ninn' of the siihitinii 111 r ( 111 111', ^iihiiiMii dl" I, -ail arctatf; thin tmir ^'raiiis zmr sha\-iiii;s; i.nil a niiiiutr. aiM L'll i >■ lU'l istrwn;,^!,. W'luTi aitii .11 h;is rrasri! . In nl auaiii aiiil .in aiii tn .in t he hall nt' spim- i,'\- Icail which haslircii cniiipai ici a linir with a ,L^lass i-ml. aivl wa>h same 1>\' ilrcantatinii TraiislVr t.i a piccr nf tillcr-]iapi r, rnll infii a iiimpaci L.-dl, aii.l place iwilhnut ilr\iii^i nn a hut cupel 111 the muttle Mr. riiiilile', slates thai a result eaii he (ihl.-iiiU'il m '-'."i mimites. which I taileil ti) iiinlirm. h is leriamh' the cxperieiue n\ must lit us that it rec|uires se\eral tunes ih;,t letii^th nf tiiiU' tn hnn^; fnur assa\--tn:is i IJO c.c ■ nf snlutinll twiee tn a linil, tn ,/;,v.s,i/rt' '•out i^ratus Zii in III!, tn emiihict a cupellatu .n, then part anil weii^'h. tn sa\" nnthiiiL,' nt nianipula' inn. Hut far f ri .in makiiiL,' an\- Speod reennls, I enuM llnl -el the inethiid tn Unrk at all, fnllnwm;,,' the scheme to i hi- let ter Insti ad nf t'le leail cc .mine ilnw n spiiiie\-, it was finel\- ilixide.l and slmwed i;i> teiidciie\- tn ai,',L,'lnnu rate. and had tn he tilt, red mit tn cnllect It at all, whu h it was the \'er\- liurit nf the jirnpnse 1 ilietl'.nd tn a\nid. Mill tile ]irecinus metals Were perfcitl\- pre. iMialed, and ivahzim: the aiha.ntaees Till: .l.^s ir . '/■ ( VA Mill, ^,11.1 I In \S. 43 m mi " ""•;'■'••■"-■ ''^^P' ■•""•■",., I u„l,,„N.,- ,„■,.,„„■,„„,. ,,i ,va^;u,ts lak, a l.ii-,. l.akrr lalunil tiO(» , , . apa. ,tv u^r , „• t. n a.sav- "■".s.,i„,|„M,,„,an,l,l,tisv.Tvuvak,n KCv a,|,l munu'l, nt .t run^ |.«n. suhn,un >,, l,,-,,,, ,l „,, ,,,al.„n .-/ , Mnn.^-.l, A.ld 10 ^•c- nt a lir , <,,lut„,„ nf k.a,l acvtatr. sIikIuIv a,„i,(K.l unl, a.vtu' a^..! .IJ . ,, ,1 10 assav-t.-ns w.-rc tak.n . ih.n a^M l,v n,„.h nifasun. nn thr ,„„,„ .,. a >,,aM,L, I„,„,.,.„ o ;< ,,„, ,, , ^„,,„, ;"'" '""•■'•' "> /..., ,hu,. ,l„s 1..,,,. MUn,u.,u „. p,v>,!„ta,c. all K'a.l pHMnt an.l Kaxr an ..xr.ss nt /nu ,,, a, l ,„, Au an.l A^ ^'"■;"" '•'■"•^"-' l"nl,,h.na.l,l 1 .- > , .,,-„„. IlClan.l 1, avc "" ""■ '"" l^''-'"' unnl .■x,v.. Z„ Ks ,l,.M,h,.,l ,„,1 ka.lha.Kulh- "■"' "','" ^' ■'''"'''■^'- '''l"^ ••^•" 'a!^>- I'Ut a Uu- ,n,nmcs,an,l the assavshuuM ,!,.„ N .ak,„ ,n.,n ,1,. h. at, ds. .1,. ka.I w,lll„„n to '''T;'^" , ^"" ^^"l"'- 'I- 1«-1 a h.tl. u„l, a Kla.s r,„l ul,„se '■"'i -as l...n ,!a,„.,„.,l ul,,!. !„„, „,,„!, ,1,.. .,„,.,•,> .,uas..,i ,n ^"'"'■'"■':"'- '''■'^"^" '-^'I'Mlv, wash l.v .l...antat,u„ ,u-M„r three 7'":,",' ""•^'' 'l^'an,„us ..f v.a,.r ,„> k up th. !, a-i avhuh ■'''"'"''''" ""' ""' "■'■"'"^''^" ""'"^-' "■ ^'>^k '"^^''IKT when FTesM-.l, ,„ ,1,.. „„...,s ,,n,l o,„,pns> ,, ,„,,, a hall whuh pla. e "'"'" ;' '';•",:" ''-' •"•' '1 '". s,,uan ,Us,„, hlter-paper !";^'''''''''^''';''''-'i-^!"-^vl..a.i,.apt,,,sepanUe„.the.;pel., '■' "'"" '"''' " '"^'^ ^'^ tokav.. an e^nss l,,r st.an,, a„.i ,lrop ''"■;" '"" '■"!'' I '" ""■ '"""'•■. iKn.n^tirM a.l,le,l a l.u nlMh.T II ilie as>a\- )s tur -,,].] culv Tl,r.,,lut,„n „n wlu.h .Ins „,Hh,Hl ^ave . x.vllent results, an-i ;',;"'^"' '"■'■'•■'■"'^- """ ""■ "I'i 'va,M,ra„„n,ne,hn,is„,:n,nnT,um tnne, earne.l al,.,u, n.l7,V, ,„■, ,„,, „,, „„ ^^ ,,^,^^^, ::;;'7 •'," '"■'■,•■': """ "'""-' '"■ -^^ n - p.,ss,i,,. tha, Mr. ,''"'" '.V""'"""'- - P"l'Hshe,l.u„rksh.,,..r ,,n other s,.lut>ons '■;:'"'^ :' " "'," '■''■^"- "•'^^- -"""'■'' -^ " -■ ^nn„s z,ne need he used' tak,n,aI.,n,M,nu.,ud,ssnIvewl,en„ne-tenthas,nueh,,„ the shape' '" ''^'^'. 1^^ atnple. IVrhaj.s dtfferent proportions of rea.^ems w,ll - neee.sarv to sun each ease, hut operators w,ll Hnd ,t worth a "tie expenment.n. to s,..ure a nuthod uhuh involves no rtltra- easi'lv T-f '"";" T'' ^'■'■'■'"'■^">"- - --rate an.i rapid, .a. h pe„ornted and e.uallv suued to lar,.. hatches and ..n^le assa\s " The ni.t!,,,.) 1- , . . ,,p,,,,i,,:,. , '■■, :•' "■' -•■-' ""■I'-al ..|'pi»ai]on f,i heat, as the Pnup.tanon o, preetous metals is p..r.e, t in the eold, hut the lead 44 RIA l:\ I t V \ Xll'l: I'K \i I It /■ dot's Tint ;ij,'i,'liinicrati' \m11 aii'l llir cxct'ss zini- takes Inni^n- ti> iii-;'«i!\c When iliiiir this \\a\'. tlif prcripitatc i| Kail iphis .\\t ari'l Al; must l.i- tiltrir.i <)\ii aii'l tlic iia]Mr, iinwaslu'l aiiH still Wet, I'pllr.i lip in a pii.r 1)1 ],:[•] tell .ili'iiit \\\<> nil Ills sipiaic anii ilrMpp.'i] into .1 liut lupfl It ina\- 111' c.f furttuT intci-csi ati'l a i Miuanuiu >• to lia\ r t he list ot nu'tlimis wliirh 1 L:atlicrcil. chictly Inmi llir Ainmiaii tr. Imi- i-al journals i.t the jiast ci'^in years; exatinle .hrniisis nia\ he i-neoura^eil tlierehy t'l i;i\e tiiein a trial, airl Kt the pnilessi'.n kll'iw the results, CioM iletennillatl' in has lueli the ehiet enneein. Iiiit these niethoils. except where iioieil tn the eiintrar\. nia\- he liseil cMjMally well for silviT. I Ml.Tllnlls I\\ul.\l\(, iKIIIIll.l llsKiN (Ik SI (iKl 1 K A I lo\ HI- I 1 11.: I- r 1- I'l-. l.l. \ 1 II i\ 1, /■.:'.;/'ei-,(/;(i); 111 a li:el t' 'il t ray. i it her ilii'eit. nr alter enn- eeiitratinntM small hulk in a pur. elain 'lish. t he tinish t' i lie I'm- ihute'l at a \ei-\ liiw heat. The tra\" is i-nlleil u)i si i as to enelose the reshlue. ail'l IS senntie^l with test leail lielnre eupellati' HI . partmt;. an^l wei'^'hiiiL; With small eharLjes isa\- ime assav-tniii of solutiiiii earrx-iiT^ i.iil\- small amounts nf clissnheil matter, the seiiritu atimi ean he umitte.l A variation of the methiHJ whii h a\'ii'ls the lea'l tra\-. is fi spiankle mtn the ehar;,'e nt' suhitiun (in a ji'ireelain ilish' '_'(! L;ranis litharL;e. ni sueh a wa\- as tn enxer the hnttiiin; then exapmate to ilrvness. ainl si rape the resi-iue with a spatula into a erucihle i ontainiiiL; HI L;rains smliuni hiear- hiinate. ti\'e i^ratiis Imrax s^lass.aml op-' Lrram tlour or arL;ol 'l"he ilisli ean he thoriiui,'hl\- eleaneci liy nioistenin<4 with ililute nitrie ariil ami niojipm^' out witli small pieees of filter paper whirh are aiiiieii to the erueihle I'usion results in a lead liutton, whieh is inipellc'L ete The eN'a] loration metinnl is the oMest in use. anil when earefully ijone is aeeurate. It iinohes nun h time, hut htlle anil simple nianipulatioti L' l'ri\ipit,itit>>] ,is SiilpliiJc !ii AiitlijirJ S,'ltili\'ii This is t,'i\en in Till- tu-u'iiiifriin; aihl \Fiiniiii IokiiliI, Xnxemher. IS'is. !i\- Henr\' Watson, ami is stated to he quiek. aeeurate. and eeoiiomi- eal, Aiidif\- five or ten assay tons solution with HCI and heat to boilinj,'; wliile tii uliii,;.,'. add a solution ot two ^'-.atiis lead aeetate / ///•. |sv IV ' '/• ( )- 1 \ //,/■ s, '/.I I h '\s :""M^-^.. ,u,T,nt.„ v:lil,un,„.,ll,v,ln.,..n„„t,I.,l 1'!, ,s pn-. in- .tau.,l. All-.w ,,,.„„, a |„,1,. wl„l,.. .,,11 pasMn, 1|,S. ,h,.n Ulur pr...,p„.t... ,lrv an.l n.lu. ,• ,„ ,. ,„.,, ,,„„„„ ,,; „,.,„„,,,„; w,th Ira.l t.st ..,■„,.„,„ ,,,,,, ,i„x,s,„ a ,n,. ,1,1,.,,, ■,..■! ,.,, An.„,s,n/.„M A 1 M KV,,, XXXIV. ,, is, A,|,!af.u .ui,„ an.l a,i.i ,.„,. ^^ran, ,„,„ „u,..i, „,.,,, „,,, ,,,,,, ,„■ ,,, „„„„,,,,,^,, ^^ -PP.T, M..,lha,-,i„„-l„„„„ F,l„.,-,hnH.«halarK.-Krav,.ap.,- ""I-". -a.h,„. IMa,... ,„ a„ a>,av . n„ 11,1. nm-thini „f\a ,l„x- in^' mixture ,,„,.,.,„„, ,,, ;;„ ,„,„„, ,,„,^^,.,.,, ^^„,_ ,,^,_^^, ^^^_^^^^___^_^ ..f so,ia. l,.„.ax.an,l n,],,...-. an,] .,„ ,|„. ,|,,„„,, ,„„, ^.,„„,,^,^ ^''.", , '"■" l'"'l<"i'th,.t,l,,.,-.,u,.ku .n,„,l„. ,,a„,|,l,,a,„l,,,v.^ ^^•.th tlK. .vma.nin. ,l„nl .,f,l„x \,,u ,„.„ ,„,„,, ,„ i,,,,,.,.,, of cenu.nt c„p,„,, ., „,|,„„,„ ,„ ,.„_^,,^ „,,_^. ,^^, ,^ ^^^ ^ ^^^^^^ ^,^^^_ ^..m. alun„„nn, ,„il H,„|,n^ ,h,. a.sav n„- v,,,,.. t„„.. l,nn,s •l-nvnlluM.,,,,,.,-, Tl,ral„„„n,„„f,„i.h,,„l,ll„.a,M,,l,,,,i„. ,„,,„„ 'if tiltrr I /%,/r.A,^,„„ /,,.>,/:,., \,/,„/,. Cv.l,,..,! „, A Cn,... ,,„ ':,'"'""'■'"■■:' '<-"-"<'van„l.. Pr,,.,...- .\,M a„ .xcvs. „f s.lv..,-„„,-at.-„,luU..„,nl,..,-an,lwa.l,. ,1,-v M,-,- an,] ,■„ h.r so.nfv '■»IH iHK. tin- .vsultan, l.M.i I,u„„„ Th,s „„,h,„i, „,■ ,„,„.,, '■"" "■""■;' ""- Au„„lv <;a.rals.,«,vosam.„l„„at,-,„„f ,h,. n-huh ,.,„,,l„vs a l,i.hn„na,- „f ,„„ash in,lua,.„- ,„ ,l,.,.n„,„. ulu,, '"^ ", "';;■'' '"'^"''■- ■^'^'■'- ^'in-'nu w,.|I. an .x, ,.s „f H„SO. ";"';'" ""'""'^-- ->■'"■-"'■ •i'-v.fus,.,an,K.u,„.l.„,. the, nJi,u- ;r"' ""•';"'-■ 1- ^■ui-ll''-i 'linv, wh.n wrap!K.,i ,„ l,a,l.f,„l M,-r-,u,u d,l,,n,K. ,„avl„. us,.,linst..a,l o, silvr,- n.trate ,- ;' /'"^'/'''""""'-.v (■../>/>,•,■ s,,/,. Maun,. l.i„,i..„K.nnin 77,. l--'>^nurnu,,vuiMi,uu,loHr„al.] W 1, i,MM. U.at K) assav-to„s '"'"1 -lua.- h..r. a,i,l a.nnmni raUup,,,.,- „,trat.. s„lut,„„ t-. a p.r- •"^''•-^' •'■'»'. >a,vfuliv a,„Hfv w„h ILSO.: s,„- a„,l „lt.r u,L- ^■atdv^ |),-y an,l ,„.,n,.,-al. ,lu- „ltcr. i„s,. ,„■ s.„ntv. cu„el ,.f S-n. ..n..,n,s,s da„i, tins n,.tho.l .,11 not u-„rk .„, f.H,l s.iiutions' •'M. tnats ,U.,i assav-t„„s ,„nf U„v, of soh,ti,,n ,u a tu-o-litre IKl SK \\1 t fl ( .11.. t / , »..-.. ._ . ^■■-::::r. ^^--pptT SUipiiaU". AlUT shakin^^ Well. 4r, k'l-A /■\ I ( )] \i!ir I'hWi in I: ai>lHtii>}i. — il I. I '111,1111 in Jour. (Ik in (.^ Mri >,>. n| S A Dtxoiiiber. I'.HIJ, riact' a l.iru'c moasiirod liulk nl ^ohiti.m in ,i llask. acidifv stronjjly with il,S(), and hriiii; t" a Ixjil A'M M) k'':«iiis /iik shaving', alimii tiw ^jranis at a turn-, waitinj.; with each addition until all that pri'vionsh- a.M'd is dis-Juhrd Kocp sMhninn stronj^h- acid fhnui^'hnut W'lirn all has lucn addi-l and dis- siilvi'd. put m Mile u'latn pniipitatcd -iiu ia tu cullcit tlnatiii).; niattor. Iiltn- ihrnui^'h d'.iiMc papcis. dr\- and char thr papers on a scohlicr, and thm ad.l test lead, scoi-ity and . uprl This tiirtliMd < an 111' n--i i] tm' An mtlw -.ini r Ai' di-suhi'^ as sulphate, A mill II Ttimr prai t'l al nicthnd i-- used m the Bhu k HilN and elsewhere Tn ei^ht assa\-tiins of sdhitiun are added en.iu^di silver nitrate -.ilutiim to turnish inijiiartatiun lnr ;,'iild. then II H:{ to ().") t;rani /iiii du-t and sutlieiem il.SO, t" rea^ t emnpleteh-. "^av .") t" III I 1 Stir a littli' and lilter tl.ruueh an urdinars' jiaper, dr\-. iininerate. and tuse m a i ruril.le '.ilh litharge and redueer tnr a lead huttun. whieh is i upelled, ete 7 I'u, ipil.itiou Uy l:niii!sioii i'] /.:>!• I lliyt ill I.I ,ui \ct.ltC. — This nuthiii] was used in smne lar.m' mills m Cnliiradu a lew vears .iL,'ii. liut I am unalile \i> '.;i\e mure than a hare outline, and dn nut knnw hnw it will werk nut Make a tliin paste nt zm dust in a stri'iiL; suhiti'in nl l.-ad aeetate and add almut ^ e i , ul' this tu '-'II iir iili as>a\-tiiiis uf snlutiun, Ai;itate and let stand inr a time, I'llter and add dilutt il.,S(), tu the lilter and wash Hry, filter, ineinerate, tuse with hthari;e (or seiirit\- with test lead , and euiiel. ete Th.is is \ irtualle the same as sui.'L'ested lur euld treatment nt tile niiiditied t'liiddev seheine. alread\- deseril.ed, thnui^di ditTerinij in man'pulatinn. II MhllliUi^ Willi II i,\llil,l< I'KI-eliir^ MLT.M.s |N I,K,\I) THAT ( A\ HI-. I 1 I'l: Ml- ii 1)1 khe r, 1, l:i\ipi'i ,itii>ii either 11 mdueted eniirele in, or finished in. a leaihfiiil traw when sulutiiin is ei nnparatn ei\' small m amount (one to two assa\' tons and eontaiii'- onl\- small :imounts of dis- sol\ ei! salts jsee 1 i 1 ,]. ^ ''''■//'■r^/-'/'-./.-r,n.„l„„a.,„n,|..s,n!,..,l. This s.-.n ■ ass. '" ' 'MMKIMI.l Ki, \|,.:t1|(M)-, lt.,r ^-,,1,1 ,,„Iv,. to,, o, .old Pnst.r ,„ /,„„ cium Mr, .> .1/,,, >„,- ,,f s A DecemluT. n»K{, «av.. a nu-tlH..! win, I, u.,nM .. ,„ „„. ,„„. ", „; r^.u.lus. H.' a.l.ls to ,„..a..i,„n,.,, .„,,,„„,,„,.„„„„„, ;;,•„; assa> a feu c-uhu- rmtuncfvs ,,t ,, lo , .,,i„,„,„ ,„ ,.^,.^,, ^ ta,nin>: I'd', XaCl, an.l a. ,,l,iir,| l"l II 1h,i1,,] III with acetio etto acpi .ilt.r lia\in ' c.p.tate rvsuhm, n-.„w.l.hM,., ,,Mln.n.a.,.„, ,.nl,..n.,l ,,,,, ',,,1 J..ssolve-i„,aK,Vsolu,,,,„, an. ,,,,,n. .a..,..^ ayi tn..,.,l„„ ,l„.„lt..rwul, .1,1,,,,. I,,-, T,van,„.„, , .f , h. „„„. hlK-r u-„ 1, a,i„a r..«.a (minnnum ,,„a„,„^ ,li..,,,v,.. ,,„, .,,,,, „„, m .1.. s.hn,..,a„..x...ss of s,,-,,„, .,a„„,.us ,.l,,,,n,i,. ..,,,,,,,„ ,,v,.s ''" -n''-;;'^-- ...t,ul„..h,navl n,,,an.,lw:„,s,an,i:r,ls -■"-■'■ In.. I'n.,..,- ,,„1.I,.1„.,1 a M,n,.l„„.ano„ „, ,h,. .,,,.,,„: "''■'•'■-•■'•:'■'■'"••■ Tin ., .,„„.,„ u,„l..,-,. -St ,s ,„..,„„„ upto,,,.. ;;";,^'->'''"-'"'-'-^ f.h.t,, .o,„.„„ „,„.,■ .n,..i,„M;;; .M . r.,.ra„„.u„„Iall .1,,. .,„, ,. ,1,..,,,,.,.,, •,-,■..., ,vm,!„.. „„ ^''^■""■'■"'" ■'■ '■"ta.,uan.„a,.iIIC|, .'IIXO, ,iua„.,-, o-J '"■""",'"" '■•""■'" ■llv,l„-.,uu'hsa,m. Ml, ..,■ at a 1.0,1 Coll,.. ',„ , ;:;;Vp'^^ '-'''-'■'-■''■-!''rs''s,a,„,o,,s.,,io,.i.;as,;r;' ' .'""''■■'"^■^'""^^--'"-l-— l-l.Mntc.,-„-a„o„,„,l,,„lt,,. smal a,„ou,,,. an.l a la,-„. ,.x...s o, .,a„„„u. .l,l„n,K. ,.L.,, ^.'/./ ll.niv R. Cassrl has .,,-,„ a p.-.,,,,.-.. „„ ' , , ^ -.■,, I,, . , . . "^ 1' a I , 1..,......^ .|im K trs, as follows: V ; \ ; '"""'■ ^V'""" "^'"' ^'""■'^- ""''' a, tion starts. Uh.n a.„n„ hasc..as.,i. a,M ,irop l,v ,in,p a stron. soI„t.,„ „f p-M,.u. c ■„.„,„.•. un„i ,|„. soluti.m is ,„s, colorless. In about ha!ta,n,n.,p.,h..pun,K...oIorwilHo,„,. M,-. Casscl says th^ ^ is Ki-A /■XT ( wwiiu-: i'i< !( 1 1( I-:. can \>v inTtnniiril in tlircf iiiimilc--. aiiil i< ilcliratc tu a \aiut' "f a fru cfiit^ I'tT tdii t,{ suluti"!!, I^y II iiirciit ratiiV;^' l'\' I'xapn.'a- tinn \"(Ty li i\v-L,'railf suhitiniis nr Jilntiiii: tluKc ido strnnL; m l^'uM. till'- nii'thdil iiiav apjih" tn a wiilc raiv^c Ilr al--i ' lived ntlur a'^'i'iHs til an i"ita-.siuni livunialf a-- a 'li-.>trii\- iT ot tlir intrrtrvrni-f i'\ (AatT iL;rn. naniflw pnta^siuni clilcratc aiul lU'L nr 1 1 ._,S'. ),. wii ii limL,' Imilin^. iMita^^nnn limniiilc fullwwi-u li\- Sddiuni I icn ixiik' ami nculrali/alii 111 with II .S( ) ,, aftn' wluili IU"I, aii'l stannous ililnri'ic arr aiMi'il tn ,L;i\c the idlnr. This last aits w'fll, Aimthir sclu iiic i-~ tn aihl tn tin- sulutiiiii (inr-thircl its hulk 111' strniii: ainninnia aiiil thru lU'iit i-alizr with sti'i iii- 11. SO,. 'ITu' siilutiiin will thru rract with staiininis rlilnriili-. l-'ni' ijuanti- tati\T wnrk. staii'larils imist lie iinparril. ami tn niaki' tlirsf iluralili' is a .Lrrcat ilil'tii ult v nf thr iiirthnil. (."misiilrralilr skill IS alsi) m'filtul. I\'. Ki.ia ^RllI.^ rn mhtihids, I / ifp,'s;ti.'ii im; /.,',;,/ In I'r.ins hisl. ii/ Miu & Met . Ma\- Hi, I'.M).'), I" 15 Stcviiis i;i\i.s a nutliml w hii h ilncs nut aiiprar in [iiissrss any aii\anta;4cs ii\aT tlu' rluiiiiral iimrcssis in jmints lit time, n iiu I'liinii r. I ir aii'urarw I'uurtcin tn twciitv as--a\'s nf 1(1 ass,i\- tiin> rach ('_".•'_' i- a- arc clntrnlw.cil hv rtirri-nt t'mni 1 l(t-\-nlt livh'iii;,^' main tnr tniir hmirs. usini; a Irail-tnil rallimk' lit 1 \iinilriial sliain- _'|, in hiirli aiiil I in iliatii . wiiii thrcr X iintrlics anmiiil thr linttnni, ami a larirr imii nail tnr aiiinlr, 'j'n each assa\- I'J tn 1.') i r nf stmiv^ ainnmnia is aiiilcil, Thi' latiimic sllnulii 111' rn\CR,! with nnr-ll.llf ill. ll nf ■-nhltlnll TwrlltX- aSsa'/S trivr jiist ri'^ht risistaiirc. aiiil with Ir^s than 14. rlntri.' latnj.s niii^t lie \'\\\ ill liniiit With a .iiiTrnt xaiwiiv^' fmni iioti tn 1 _> aniinTi'. aicnrilini,' tn fnujm-ss nf the sulutinn. the '^nM rnnu's liown li'-i,L;lit Thr cathnili is waslinl. ilrinl, rnllnl uji. and si-nritifij with trvt-lnad lnfnrf ru|irlliiiL;. Tlir iiiiK- tij,nirt.'S },'im-ii tnr inniplrtrnc-s nf [irciipiiatinn state that a s, ilutmn ran-\-in's' ■'^111 tn >l,") in L^nM v.ill hr i kaiu'd tn .ihmit HI. in Imir hnur- If this is thr lust tha' ran In- ilniu , the tin llinii i^ tint appiiialiir tn Inu L;railc' -Mihitinns It wniijil soMii that riipillatinii nt tlif lathniir 1111.1,'ht liv mailr witlmut pn liininarv ■////•■ .1--M V . an,l up to .'l)(l. In Anu-rua hahnu.s .an iva.hlv l,r inirrha-r,l whi.h arc sriKitisv m ll(i| „,„ ,„■ ..vm "■"-'""'•"' "t thi., -'-akn,^ thr tnnn.T l,^u,v, -(M)\is,a v-tnn. "■■■"I'l l;,v. ^,,1,1 rr.uh. a.vurat,. .,, tar a> tl„. ^vvn^hu^^ ,. r-,n- '■'■'■"'■''■ "' "■ !"■'■ '■■" What ...n.-.ivahh. usr >u.h a -h-nv ot ,..vr.s,un can 1„. ,. „,,t .tat.M Kv.,, :;o as.av-t.,n. wnuM un>d, dou-„t.,(M)(17,whph,..artn,..r,hauava>lal.I..n>.th,„N,,,-sa,nphr.K an.l :n.aM (jue -ram <>\ ziiu >lia\iii>,'s and plareon the lujt plate. Heat, hut imt in I„,ihni,', until tlie lead lias 1,'athered armmd the pieees ..t /.in; . This usualh takes ah.iut _'."i minutes. This pre( ipitation lieim,' e.miplet.', 2ll e.e. edii- emtrated IR'l is adi a fhittene.l .ylass rod. it ean 1 .e pressed into a eake and the elear snluticin poured off. Wash the lead twiee and then with tin- tm.L^ers press it into a eompaet mass, drop m a lead-foil funnel, lea\ im; a \ eiit for escape of the steam, plaee ni a hot cupel and jmieeed as in an ordinarv eujiellation. This latter ojieratKin consumes friiin 2.") to :{."> minutes; the lead button is reail}^ lor eupellation in aiioui one hour. I ha\'e used thiscin solutions \-ar\ ini; in stren.i;th from 0,01' , KCX to O. p , KCX and in \alue from 04 to :; o/ -dd per ton. 1 have also used it for the assa>^ of silver solutions, l.ut when thev are ricli the n-sults are lower than those ohtamecl 1,\- the evapora- tion in leacl tioals. I he secret of keeuin.!,' the lead from hreakmu! up. i- not to allow the solution to eome to a lioil at anv state ot the procedure XoHM.w (' ,Siin:-;s Berkelev. Cal . April L'H, I!t0(i. Till-: tri-:at.\[i-:xt of di-skrt ori-s Tllr I-^illtor. Sir One of thr first rr,|uisit,s .,f .^r,,,,,) ^..-iticisn, i. that th,. cTit.r shall at K.ast ^uv l„s virtini a ta.r lu..rin-, I rrtrr tn o-r ta,n strutur-s ,„ vour ,ssiu. of April 2s. „„ a \,nrf artu-l.. ,,f .nin. tou.huiL: ,!,,..„ ,„v t,vatn„.nt in tlu- T,,„.,p,,h.(;,,l.i,„i., .Hstrirt t unwmmulv I havr inMMm n,u^-l,-sl„„l ,,„ anv n{ Mr lUTtran, HutUs n„talh„-i.al hnl,l,i,.s. I am surrv: l,ut iH.fM.v ..n.it.nn.^ '-' '"'■"lal apnjn.^.v I must a.k hitn tn ,1,, ,„,. th.- ,usti>v t'u n-rra.l "iv arttd... wlnrh hr sm hlumlv ,l,Mn.ssrs an,] sn ,,l,v,.,„slv nns- uiiijcrstands ''1 rH.Trnr,- tn th.- n.vcss,, v ,,f amalt,'anK.tinn at tlu- Cuniluna- """'"■"^" <-Ml-M. 1 v,-asn,.t un,l. rtak.n,.. as M,-. Hunt .ntVrs a.;,-n.-ral,l,s,.uss,.,n.,t Hu- I ivattn-nt ' •.,( ,,x,.liz.-,l n,vs .,f the ,1,-scrt r.-.u'inns .,t .W-va.la an.j Calit.M-nia ■' Th.- .lassita-ati-m . -f Mc-sm -r.s ,. My, i[„,„-. ,,,,„ ,, ,,,^,„,^ J,, ^^^^, .^ ^^^^^^^. _^_^^_ j^^^^^^^^^^ ^^^^ snrts „t „n-s a,v t,.,„,,| i„ ,h.- .K-s.-n, ,-,-,|uinn^ various mcles '■' "'^""H-nt. an,! var,ati,,„s .|uit.- as ,,n.n.u,n.-.-,I ar.- Inun.l it, n..a„ua,n,.us r.-,:,,ns an.l h,;;h altitu.i,-s. Hani ,,r.. ar.- f,,un.i in '^"■' ''''T''. ^'^ "■•■" ^'^ --'• "'■'■^: "^i'li/> 1 as w.-Il as sulphid.-; an,l anv t.-.hn,.al man familiar with -l.-s.-rt , ,,n,lui.,ns. vsp.-.iallv thns,- '.I'M-'-vaM,- at |-.,n.,pah. C-iMfi.-M, an^l Mnlltn,-. w,,uM "irinllv '■'" """ '"'>■ ''l>ni.l.-r of niakin.^r so m.-a.nn-;U-ss a .-lassifu-ation I was n.,t ;:.-n.-rah/,no ,vh,n sp.-akni- of or. tr.-afm,-nt at "'^' <'"»l""at,on n„n.-. I was phunlv r.-f.-rnn- to a sp.vific >-aM- o, an „,„„„,.! „,„, , „■ oxi,!u.-,l ,,r.-. p.-.uliar t., a I,n„t.-,i ,iis- tn.t Mr Hunt a,lv,,.at.s .Irv .rnslun,^^ as applu-,1 to ,h.- soft oxi.hz,-,! p,.ro„s ,,n-s of th,- , l.-s.-rt, un.K-r th.- impr,-ssi,,n ,-vi,i.-ntlv that tins ,s,h,- sort ..f .,n- f,,un:l at C. .Mlu-1,1. and that it is diara-- tmstu- ot th.- d,-s.-rts oi W-.. ada and Cahtomia Tins is an ,-rn '"to wln.h ,,flu-rs hav.. fall.-n who ar.- not a..|uaint.-d w„ h tl„ s..i.H,.-rn .\.-^ada fi.-lds Tlu- ox.dizoi or.-s of (loldtu-id an- not porous, and tlu-\- a'-.- not sof' i-- (■: . ii, i , .,, - • ■' ' '■'"^- '" 'a. t tni-\ ar.- .-xi r.-tiu-l v hard ""■ '■•■'■ o| th.- f.mdnnation mm.- has l„-.-n d.-s.-rilu-d as a -silioitied •■'"'''''"'■ " '^ "' ''•"■'! ^""! l""^'l' and lnu-L;ra„u-,| that .s.-l.-ol.-.l pu'c.-s ,.f r. ha\,- In-.-n ,onsid,-n-d suitahl, ,r n-„f.-„-i l„. ♦,;... P'''-"l''s .n tlu- fu!,.-^.n,ll us,-d tor r.-^nn-iiu^ the s.,ftor sulphi.le vi ir u- I 52 Ki-A i:\r (VIA //'/■: /'/\. w tk /■: lire. Scinir i.]c;i .if it-; Iiar'liirs^ may lif yatlu'i-ccl (vmn thr fad that 1.:{1)(I 11. -taiii].^. with ti-in. ilmi), lalliti'^ 1(1(1 tiiiu s [.ir niin. will, uiiilcr tlu' ln-st I i.n.litiiiiis, put .Jiih- 4 in :\\ ti.iis yvv stamp per ilay tlir(iui,'h a I'J iiush wirr sirrrii, Mr Hunt l.iwails ■'the iircscm fashi.)n of ])uttiii'.^ m stamp- mills an.! amali^amatini; ari'aiiijrmcms follnwril h\^ a rx'aniilc .amifx. as i]iU' m .It-ly tn the ri.m]}('lliiiL; pi:\wr of mstom " If surli is thr priAailiiiL; praciicr, it is much tn he iloplciml . aii.l 1 rri^rct it nn Kss than he, Ihit tlu' allusion so jiapahly insinuatrs that I have olTcn.lcl in tln' case of tliv Conil.inatioii mil! tliat I hasten to relieve Mr, Hunt's anxiety on this se. .re li\- otferiuL; a few fai ts, 'i"he t".. ml. illation imll at ( 'loliltieM was not iiistalle.l until tile treatment of the ore lia.j l.eeii throu.Ljhly iiu'esti'^'ate.] Tins re not l.rop(,s,. t.. enter here into the .Ictails ..f treatment. ,is I am reserv- ing,' this tor a special ai'ticle. Hut sut'ti' e it t'l sa\- that cntrarv to .Mr, Hunt's l.ehcf. the matter of or.' treatment was !^'i\en a thorou-h stud\-; an.l we wi're n..t. at least in this instance, the sla\-es ( .1 cusi. nil. In r.'-ard m the ri'c..\-ery of yoM .,n plati-s. 1 W(.ulil certainly a.lc.icate the use ol amalyaniation where as much as .")()' , ,,f the Ljolil can lie so re.-o\er..l .Mr Hunt is p.issil.l-,- n,,. tamiliar with the i-haracter of the -oM f'..un.l in -l.e (;..lillie].l .listri.t. It is tine, to l.e s-are. as .listin,miisheil from the coarse ..^ol.l ..f the Cali- fornia .\l..ther I....|e. which viel.N such hi-..;li results t.. ainal..,'ama- tion; l.ut n is not l.x- anv means iiuisilile, and most . .f it can he ■panned ..ut' ill an ..rdmar\' miner's pan In other wonls. it is t.Mi coarse f..r .lircit c\-anidin'^' and too tine for the l.est results l.\- amal.<,'amati'.ii. .Moreover. Mr. Hunt has e\i.leiitlv n..t con- si. lere.l the ..^n-i'at advaiitat;e of lieini; al.h to secur.' .laily from jnans .j(; , oi i;\v extra. ti..n . .1 li.iiiie. i ioini .>.'»i( or.-, as eoniiiared rill-: IKE MMi-.xr or i)i-:^i-:i passiiT^' the tailing -nviT some aiiial- k'ainat;nL,' .Icvio." uhil,- no ,loul,t in-cnious. will hardlv at),.fal scTiouslv I,, pra.tiral tinlhntcn. An.l what, l.^t mv ask, does Mr Hunt propose to do with th,. very hi-h-.^'rade concentrate obtained tn>ni this ore, whirl, it ,.avs s,, well to extrart and ship- Must tins also !,e reiiKJVed after e\ anide treatment' My >ritie's views , ,n this whole sul.jeet are summed up in his query, "As the niaj<.rityo! these ..xi.h^ed ores j,.ive a [.raetieally eomjilet.' e.araelion l,y ,lireet eyanide treatment, what is the advantage of usin- hoth amalgamation an.l evamde to ree.n er the same \ altie."" My answer is that I do not admit the eorri'c tness oi .\[r Hunt's pn-mises. He is evidently an anient advoeate of drv erushin^; and while I ,l,,lnot intend to p'-"lon- t his diseussi,,,, into a eonsi.i- cration of the n spretive merits ,,f the two proeesses, I eannot retrain 'nim mentionm- some of the more senous limitations <,f drv ,rushin,i,r A fc^w vears a.yo I was happilv instrumental in eonvertm- ,.ne of th,. lar-est -Irv-erushin- plants m the West ithat of the C.ild Road min,. in Arizona into a wet-erushm- mill It was an e.xpeiisiv,. and welhe,|uipped plan; :::^.l ha.i been in opera- tion several vears; and s,, ;ar as I eonhj see, it had been u,,rke,l to its hiuhest eftuieney. The c^xtraetion obtained was about SO','. The ehan-e to wet erushin-. „si„u Huntin-ton mills in eonjune- t.on with the e(,arse rolls alreadv installed, and Delme tilter- pns,es to handle the slime, raised the ixtraetion 10',, and eon- siderablv decreased th.^ o.st of treatment, Amal-amalion, in this case, was disp,.ns,.l with alto-cthc r, as on!v about 1,V , of the value, culd be. s,, recvvred. Two other representative drv-erush- m- mills, one ,n Utah and the other in somlu^rn California, are now eonsidcrmL; the. remodclin.i: of their plants tor drv crushing, after obtainin<4 promiMn-^ exjierimental n-.n'i. These projects and .h.an-c.s are all basci upon the following tacts, wlneh [ bc'lieve will s, . .ut or later rnluee the applicabiiity ot drv erushnu; t,, a f.w rarc^ and isolated easc-s, ,1, The im- possibihtv itrom an economic' standpoint: of reducing' ore to a suthcient tmenc'ss to , n,sure the be^st rec-ovrv, without making pere-olati..n pn ,inbit i v.i v slow, (li, The- now L-enc'rallv aceeDted view that tlie pro.hiet of any ore erushin- mill must be handled 54 Kl-A l:\ I ( WWIDI: rk'A( I /( /•;, cithcras ,i slinu', <>v a> cla^^ilud .-and ami sliiiir. The sljtn.' i-(i|uu-fS sliort ti'i-aliiu-iit with wcHk st .luf.Mtis, ih,- -aiid, Iuhl; rcniail with stiMtiyrr S'llutiuns ICmm-x- iii.Mlri-n tnill. - reduce the field of drv crushing; to a \cr\ limited sccipe. I'k.wcis 1. I^osyti. San i'raniisco, .\Ia\' II), ]'.HU], .\<)Ti-:s ox TUHi: MllJ.S AT l-:i. ORO. MKXR'O /■.'i(ihl,,li\>ii^ Tlic> manauniuiit Mt ICI On, Miiiin- \- Railway ''" '''"' •' ."'""! 'lial "I tn.ul.lr with ih,- f. uiii.lat inn nf <,nc tube- niill. .lur t.i iuipnipn- scttiiiL; nf tin- cniicnt, Tluiv i-; a tcrrihU- \il. ration when the nnii is nmniii-. It wi.uld l,c hcst to make llir lounilations 10', hrax i.r than thr plans usually calk'.! tor, usin- thr \crv lust rniicnt, an.l all..win<; suffnifnl tiiiif to srt ,Kar throu-h l.rloiv the tuh,' starts. Un.Krncath tluTe shouhl 1,,. a ,un,„l r.nuiit li,„,r >lM,,in.- f, a s^'uttor k'a.iin.i; to the cone, spitzkastrn. pump, or wlu-el. cnnst itutinj,' t he ivturn lireuit, so that the ll.K.r can hr washr.l with a Imsr, the washing,' I.ein- returne,! with all leakai,'e of mills tor n- -.^M-indin-, Kolatioii It is important that the tulies rotate in a direetion sueh a. to .ause tlir thrust ot the .Irivinir j.inion to be downwani into the pillow block, and not up ai,rainst the eaji. the rotation should be elTeeted bv an open belt, it possible, [f in a. eomplishin^ this the mill runs baekward. it is best to reverse the spiral in the fee.l-throat. as the spiral is the onlv thin- that makes anv difTcr- eiKv to the direetion of rotation. The spiral at the disehar^e end ean be remo\ed alto,i;etlier. as it seems to 1„. of no i>raetieal value, mills w,,rkinf,' just as well without it. as (jthers with it on the same work. Leaks. A leak will ofuMi start aroun.l a b.ilt when it is im- I)raetieable to shut the mill d.,wn. If there is a icment floor It will make no dittereiiee, or a bolt may eut out dilirelv. In this ease, feel in the hole with the tint;er and if the liner is .i^ood, put a wooden plu,.; m th- hole until sueh time as is n. . .ssarv to shut down for more extensive repairs. If the leak oeeurs at tile head of the mill, the sand will i;et into .u'ears and eut them badlv. This ean be obviated by imttin.t,' a shield on the ,i,'ear-wheel rim. to eover outside ends ..f teeth, bv tasfenin.t,' iwith. eap-serews a nn;,' eut fr.uii sheet-iron .\"o. 14 orKi ,<;au<4e. This shou!,]. by all means, be "mir, Ilnll will lllv.sMlatr MilillL; the ll.ipinT furtluT Lark, in i.r.jrr t., -n at tlir pa. km- -kiii.l Tlinv !< a k'l-ral .Iral . .) wrav ..n llir pipe liv lln- m.an- it , an l,r ipiirkly an.! raMlv ,vplar,.l Thr l.r.t parkin- I., u-r 1. ^in ...mmun hiisr rut m in^lr. i.hia! rm,-> 'riinv ^IimuM !„■ a .Ir ualmn- ,,,„,■. or iiuli.-thuk.'niT. .lir.,ll\- ,,\,r i!„- hcl ;i.,pp,T, t., -.1 llir pulp astliirkas p,,ssil,lr Im;- thr mill iiiir t,, ,,n. ■,.,!• lr>s. Thr M\,.r|],,^v frnm ilii-, ran l.r ,arrirJ .,\,t thr null int.. tlir .jisrliavj.- h, ,x t-. ililul.' tiu- pulp a-ain >. . a- I., niak.' it iL.w thp.u'^.h laun.jrr-. I'iil;.'nii Th.'i-.' >.h..ul.l lir a plait., nn ..\,T.'a.h mill, witli :i hnpp.T .iv.T rarli man li..!r t..v pulling; m i.rM.l.'-,. ,111. 1 thr i.rl.l.lcs Hh'.uM l.r l,r..u-hl 111 at this lr\,l it p,,.siM,., t.. a\-..i.l rlrvalm- th.-m^ Til.' liiiin- ..| p,-!,l,l,s im,, tlu- si.h- ,,t tli,. ,„:|| j^ ,., .i,,^,. ,,„,] I;ilM.n.,Us I..1. Tin- plal|..rm \v..ul.l -i\r arrrss t., ili,- j-ulp-lhirk- rnin- r..n,-al-,. With rvcrxthinL: arran.^..'.] in ih.' in..si r..n\rni,-nl inaunrr. ihr milU -ImiuI.] nm a maximum ..l' _'ltl .la\- j.rr m..nth If ''"■'■'■ ■"■'■ ""'v ■' '•■"" prl. I.Irs I,, put m, tu., ..r thnv m.'n uill (li'^t^l!.uI. tlu'in .-asilv. I.ul ii thrrr is a -ivat .pianlil\- t.. a-M. '' '" 'P'"l<'''' '" lill 'lit- mill lull up I., manh'.lr. put ..nth.- ,1.,..;- t.'mp..raril\. ami .4i\c th.- mill atrw luriis t.. .list ril.utr llirtn. n'pratin- ihr . .p.Tati. .11 until s,uiiri,-ul p.-l.l.lrs ha\-.' 1,,-,'n inln.- •'"'■'■''■ -^t I'^l •'■" 'ii-v k.-p ih,- mills ,„„■ t,, thivr .n.h.'s m,„v Ih ill hall t'ull. l.\- m.-asuivm.'iit tn.m i..p ml..' I.. p.-l.l.l,-s. Wlu'u til.' mill is ..prn.'.l |..r ivpairs ih.' |..rrman nu'asuivs il,,' prl,l,K-s •■iii'l ••'"1 I'll thr \v..rkm.'n iusi li. .w man\- sarks t.. a.M Thr\- iii'MM- all..\v th. m I., wrar .I..U11 tn..iv than I. .ur m.hrs I ,rt. ,rr iv- lillm-, Liih-y.<. 'I"hr Krupp linirs at I'l ( )r. . arr I i, in t hi. k. . .1 .hill.'.] cast in.n; thr ,hill is ..nly al...ut \ in .Ir.-p. an.l wlu-n it w.'ars ..lY. t!u> l.alan.v ..r 111.' ].lal.' \v./ars mu. h tasl.T, Thr w.'ar.-n tlu- plat.'s is .'hi.-llv at tlu' h.'a.l ..f tin- lul..^, an.! .Jiminishrs with ra.h n.u- ol' plairs t.,..v.,r.l Ih.. tail Th.> av.-ra-r lit,. , ,f Krupp pku, s iKin.^r III .lays. with, mill .\... :!. ruiinin',,' :iL' vv\ . p.r min , c-..nlainm- 71, I.ins,,i p.'l. Mrs an.l -rin.lim^r 1 iT) t.,ns..f sail.! p.'r .kiv^ of a ■..■!■;, hav.l .piart/, pr...huin.4 al...ul .-)!)', ,,1 malrrial thai '.vill pass L'llll mrsh. lir, ,,, ,1,,, ,vmain.lrv i..in.^ l„.nv,vn 101) an.l i:,(l mrsh. Tiu-- arr v.::'.: •.'.'.■.tt-'-.-.'.-.r ;l^..;,- !..» ;; :., . : ■ ■. .\"//.,s ,,\ II I SI. M/ijs 1/ /,/. ,,A', ' .l//-,\7( " cx.irl whitr .aM n-,,,,, nn, , l„llr.l. I„n „ i. run .„ v rrv th.n s,-„„l ,„.,Ms "'^' '"""'''■'- !'•'- a Inrnnil,, (.„• tl„. .a.I.n-, ul„. h pp.lu.c. a v.-ry l.anl n.nal . !,.„ ihmu^.!,, an,l w.ars rvrnlv a>nl ..(uallv ''""■'■ '" •' 'l"anrr ,„,.|i .„• Irss. I, ua> „.,, ,„,.s,l,l,, I,, .,,, ,!,.■ ,.xa.t """'"■^'""" ■" ""■ >'■•">• ''"' anv ,ntrll,;;,.m l,„„i.; v ln,v,nan '""''• ^""" "■^' " ■-"'■ a> a hanl wliur .a. tiny ,., „,a.|. I,v u^uv' ri-niclir.l ,rn„ um,l n ,. Nvn^ !.,„• ,n ^hr,,,,. an^l a.Mm./a lull,' sulpliuv. Xm :; mill i,a> mur mws ,,1 ,,lairs. u„h tlnv hnlrs ,,,,11 ""■ ''■"-''' '^ "" '"■ ^lian-..,l. ,„akin,u tlnv.. plates with 1 « , , li,,K.< '"■'' "■ ''''^■'' 'l'^' I'la- "t tun ,,]at,... an,l niakr llirni P, ,n th.rk At hi On. thrv nc'^vrrniplv tlu^ mill t., iv Imr ,1, l,ut put u, „„e '"■"">'■>' plates at aiuiu-as nrr.l,,!, uul, ,l„. p,.M,K.,.,ll ,,1 Tims ''"■ '-■ '" ^1""-' I''at- ■A.ll l.r l.^lu,,- „, h;„„il,. ,1,^,,, ,|„. n„, '■'"- '''•'"•■■ " ^'■•'1 '^'^' !""'-~-''-. an.l it ..,„• l.ivaks l„.r.„v it ,s w.,rn '.ut .as thrv s,,m,i„„... ,1,,., ,1,^,,,. u-,11 1„. K-.. „.,,„ ,,, ,|ir,,v aw.v llu'S.' plat.-s w.-ar n„u 1, l,,,,.^..,- ,!,an Kmpp plalrs. an,l .nst ,ust halt as nmrli, Thr plafs must 1„. ras, ,„„■ m .urvr, tlu- l„,l,.s vrrv raivtullv .■.„v,l. an, I tlu- l„,lts t.„-.-,l tn,m ...mm,., ,n,n u, "ai'.T "I 1„,1,.. Wlu'ii thr plat.-s aiv put in. srr that the ■' ^^""' '^ "i"'"ii.ulilv rl,'an..! ,,ut ,.f h,,lr: pla,,. tw.. m.^n ins,,!,, an.l tUM ,.utsi,l,. ,,t null, lake t\v,, hmIs L' 1 1 , tiin. 1,.,,^ t,. i-ass thn,u-h tlu li,,lrs. s,, that tlu- nu^n ,,utsi,K. ,,,n h.'lp t,, hit the plate the '■'"K -:.n,lin^' it t,, ,.xa,i p,,sit,.,n TIr. men ,ns„le ean eas.lv ''"''' 't '" l'la>r, wlnl,. the n„ls are ,vm,,ve,l. one at a time an,i the ''"''^ ''"' '" "'-i^'' ""■ t'"lts t,, a firm an,l ,l,,se seat. w,ih a ^le.k'e. while th,- nut is l,em- ,{.] ,(,,,„,, ] „-,,,, .^ ^,_,-, ,,.,,,„,,,, j,^,,,^^ a wash.er an,l .gasket ni 1 ,n. sheet pa. kin- un,ler th,. nut l! the I'k-nes are well put m s., ilu'iv ,s n,, spnuL,' an,l the l.,,lts lit per- t"tlv. thev will w.-ar ev.'nlv ,i,,wn t,, ■ „,.. witlu.ut hreakin-r ,,r eausm.^. anv tn.ul.K, F,,ur m, n. atfr thev l,e,„m,. lamiliar with '!!-■ w.rk. «ill tak.- .,nt -.1,1 plates an.l put in new at th,- rate ,,f .■!l>"Ut thr,-,- per h,iur. At HI On, th,-v hav,- |,,un,l that tlu- en.i .iisehaiv,' plate ■n- ■jralm^ -lis. ha,-.-,l p.-M.K-s ,.„, lar^v. .-ausin- un.Jue waste ati'i have thus n-pla.,-,1 ih.-se with ,,th.-.-s c-/: I'K 1( //( /•. put in scrirs with the nid imc^ Tlir pthMcs >lis( IiarK'iir^ tnuii the tir^t null arc ]iut intn the scrnn'l, wlurr a tiiu' ills, !iavL,'r ^ratr is usf.j. tile ]n l.t.lis linall\ iNsuiiii^ hrin;; iKit ninrr than J i^i \ m The liiM-haryi' must he \u\,, an upcn hi.x K.ntainmi,' a si rnn with al dut J-m hdlo to latili the ]icMp1(s ■i'h<'\ Ikim in \im- a Xm ,') mill, .") It 'liani , L'7 It liinv,'. in--iilr nuaMirc runnini; .'^ !r\ jur miii cntamniL; l(i to 17 tons jnhlilo ami N.IUd kiN. hnns, fcciuiiinv; 11(7 li ]. ; a Xn \ null ."> It l.\ L' I It . L'S n\ |„r miii . ( nntainiiiL; 11 X<< 1- t'>ns iirlil.lcs, 7..')L'I) ki!<. hiurs. and r(i|uirin'^' s,") h ji^ and a Xo :; mill. I It 1 in Ii\ Ml It 'J m rumum; at -Vl n \- per imn . cnntainin- 7^ t<.ns ih-I.I.K-, I, .■)■_'(! kilo Imir-. nciiiirini; 'i" h p 'riu'N- haw dctrninncil. attrr sv \cral innnths' carfful ol.str\ atinn. that the Xo :> mill is thi must ri'miminal and clfi- (.lent t2.") 72',t l(),tij.") _'..-),s!i 7,(t,^7 i,:n.') lti,:ilii _'..-)S!i ital •-'1,777 WA-W .iL'. :•!().") {\.X<,S 'idle mills weri' Ljrindin;; al.oul N,7ni) t.ms i)er month of l.attt'ry sand, hesides the return sand. In my opinion it \\ , urnut pra' Ik r an.l makr iiian\ altiratuc siij,',^'csti(ins rcprcs, iiim- .lrj,a.-n,n s i,'. a ra.li.al iiatiirr These r,-, .miimniia- tmiis N\,iv s.il,siaiitiail\- i]. 'I'n snl.siituK- ruarsr lur tine sifiTii Mil l,a!t.Ti,s i2 T.I .lisrar.l all iiic, hanii a! cntui'inra- ti'in '■'< 'I"., sepaiate llir ...ars,. i,i-.„1u,t l,y livi-anli. .Ic\iccs. '■• '" '■' ^niiil icyars.' ppMhu ts m tulx- nulls (.">i '['■, |.n,\i,i,. sfcMn.laiv anialuaniatiMn taMvs ailrr the tuhrs. it|) Tm itiii.njvc ''"■ nirtliM,]. ,,| iiurr-liandliii.^ iii slime-]. lants, i7, 'l', , mak.' use >il till' nltei- press III Ilie ta'atiuellt <.t ^Imie iSi T. i iiiNcstii^'ate the ecdiiMiiiieal pMssil.ilities of reiJueiiiL; the wh.ile n\ the lliill-]uilp to a titness suital.le lor liller inxs-in-, an. I thus treat <.ne |ii-.i.lii, t in ..lie operali.in 'I'lie p.>nit \iiM,n whieh the -ivatest einjihasis was lai.j was the tU'fOssity loi- III,.. -lin.lin.^, an. I o\ .rwhelinin.^' exi.leiiee was pp,- ilnee.l t,, pr.,\(' , . .in lusjx d v that the p\-rilie eoiistitueiit iif the Witwalersran.j on. alt.r l.ein- suKjeete.! t.i im,' tjriniliii-. viel.Jed Its l;.>1.1 to an or.linar\- eyani.le s.ihition as rea.lily as the sili,|,ius p..rti..n ..f ihe r.r,' It was turther state.! that l.y th.' use oi the tul..' null the .hitv ..f the stamps w.uil.l he iiierease.l an.l tiie extras ti.iii iiiiprovci. As !:;,■ result .if these su!.'i,'estioiis. the lirst tulie-niill on the Wit watirsraml was inlro.hue.l at the Xew Coeh mine, ami this 'III,- was f.ill.iwe.l a little later t.y several ot: -rs at nther mines. Sinee that time th.re has l.eeii a :4ooil deal of experient'e L;ameil 111 the use of the tulie-mill. liut it is a si',,'nitieant faet that tho reeoninien.lations alio\e speeilie.i in ret,rar.l to tlu' tulie-inill, seeonflary anial,L;amatioti. (oarse sereeniiis,' t.) j^'et inereaseW stamp 'Uity an.l hi.L;her extraction, liave l.eeii follcnveci and j,'enerally aeccpted in this niininj,' ■eiitre. The furtlier suK'},'f.stirin to tilter- press has not been followe.i outside of the Rroup of mines teeh- ilK- ,.,„it,-,,ll...l 1.,. .1,., r Z ui L.-t iia\ c sinee lieell Jointly adviseil and put into praetiee at the Mever & >>n NF.( f-:\ I ( ) i.\ //'/•. !■/< \t 1 1( /•;, Charlton ami tlic \. w (■inch iniiics. Ii i^ .m ihr n->ullN ,it tin- wiirk lioiu' at thc^i iwm mim-s that thi wiUds pru[MP>e to l,,isi' tlu' wholi' of the >t,ii( iiiriiiN t'. Kr i ml .. h |i, ■, 1 in thf jiri'st-nt mn- triliution. Tlu' rial nu'tallurvjiial work Iklmii ui January. M'lMi. ami we ha\f thcrcforf had tlircc itt>>!ith- in whi. h f .ju into lic- tailiil iiiM>tii,Mtiiin 'I'lu' lonsiiniptiun ui water at tin Mi \rr \- Charltnn is now I7(» K'al. as against an a\rraL,'r ..t .")(i(l -al at DlhiT iiiint-s. The attual sa\iii,v; is ilh ~trat. .1 l.y th" fan that w hc-rras licfnrc the nrw |)lant was installnl the amount i.l water availahli- was itnlv just sutHeient !■> meet the .l,iii\ !> 'iiiireineiits. there is an exei'ss t'HJay (.t lAer iliilUIH) ^al,. (i,iial tn M.iiie :tll() '^al per tnii , >t on- erushe.l Th. k . iiisuii'|itii 'H in thi' iin lalliir'jieal pl.mt i^ :;r. s i;a|. per t'lii ' 'I I 'ri' eru^hi'ij At 1 h< Me\. r \ CliailtMii plant the a\era-.' I'ost of e\-atliiie ui Mareh was ri!t.| per t.m treated, the aitual i • ■nmnnpti, m , ,t I'yaniiic lieini; halt a pr.und. e(|ual to a total ot ."j.iirCi |1, The eost ol' little \\a^ i» l.")7'l per ton treated, the aeni.al i on-iitiiption t.eini; (I.N 11. per toti treated, tile total eonsumptioii i„ itiu n, HiK 11. The total aiiioiiiit ol ^.ilntioti hi i ireulation atiionnted to _', !:;:{:{ tons, whieli ii.id an ,i\era'.;e ■-trete.^'th of iii):;s', l\C--, .md an avera^'e \ alue oi _' clwl <,'old per ton. tlu total eyaiudi- e,,iiiaitied lieini; l.Csis.d.'i lb., an-l tlu' total -oM eotitent 2i:; oz.. the alkalinity aeera'^iti'^ I) (His pi r ( eiit . Tile a\-er;e.;e anionnt of ^,,|d . ii->-ol\-,',l in th.e mortar hoxfs 1- 1 ■17 d\vt I er toll of ore enislud, Tiu' elfi . t on the ]ilates is marked, and a: 'lie Mi'yer \- (.'harii ti it \\a^ ^neh that the lowi'r portion ,,f th.e plates has t.'ien i ut on, as it wa< fo'..n,! tliat they weri' doin,i; no i^'oful as far as .arrest itv.,' '^ol.l was eoiu.riied. \\ liile on the other hand they were sliowiii.,^ si.„;iis of putiii'^' aii'l -radiial di-appearanee in the eireiilatiiiL; solution Tliest- plate-. lio',\r\i'r, are !_' years old. and '.vere thin wiieti the einul.ation of ^opation was l)e<.;un It is !.elie\, an. I that till- jilatcs thfiiisclMs aiT MtiK halt ihr m/c 'it tliM>,- ^'iiU'i-allv adnptcl. the cost pi : tmi lniciinrN iti^i'^'iiiti ant 'I'lif rcciivfi-v li\ ainalijaiiiati.in n.,u as , . .iii|,aic.| with the old s\slini. ilhi-lralfs ilcarlv thr rtlr, t ■.! lakin- the Ini. -.il-l im,, •-"hili..n. thr nspr, ti\r ti'^Min- l.ini- ki(..\,rv li\ ainalyaina- """ 1" j."i'Kir\, I'.td.V .-,0 1.')',, -....NavN !,\ ainali,'ainatiun in Jainiarx . PMMi I", Jiij j„r n iii I'hciT 1-, nm a-]Mc t ot ainalL^ainatiun wnrthx' ■ >f tiuiitiuti. ;tn.l that IS the dali-.r ..t ihcit, |..r it is a la. t that 'hue is a hi- ll In it tiMilr m anial-ani. and tin -a ntcrs a it . ipiniMti that aniali,'a- inalKin muM l.c (iisp.nscl with alto'^riicr iinMrr I his s, nnr The Iii'int has n,,i \ ,-i l„,.n pnixcl. |,,it it ,an casih h,- put to t ht- prcM.i, and this will l,c dune m thr mar fiitmv It \\..uld l.r satrv in ha\.- all thr LT'ild in one plai r, namcl\-. t!ir rxtfartor l„,\,-s ()ni;inall\- it was li.,p,-d that liltrr prcssinv; w..til 1 1 „■ unnrrcs- sary I his iK.p,- was hasrd on the assutiiption t i.t a pn.diict c-'iuld !"■ disrhai-'^^cd c .ntinii' ins|\- imiii ':ir last xat. .huh \\..uld c.intain n..t inMn- than .Vl' , nmisturc. Atti r s,,nu xaafs ,i|' i x- !"■''' ■'"■• ''!<■ >'innsi,l>rali..n. h.iwcvfr. aii.l att.r -ixin.^ .hie wfi^hl t.i tiir niain- tcnaiKc ..I slim. .lams, i.isi .,| puininn- l.a. k s,,|uti.it;. |mss,s Ii\- ahs,,rpti..n, aivi tii.' daif^iT ,>\ the .Ian ■ .^i\in- wa\. tli.Tc ...uld \,'r-taid-an1ati.in plant, is that the im.r han.lhn- .an 1„- .l.,nr simply ],v the r(-i,rulati..n .,t a \al\e anil at un ,-(.st ; an. I as a stora-c plant. t.> !,.- w,.i-kr.i j(>intl\- witn a in'U-i-pn-ss, 11. iias many i.oints nt a.|\atHa,m'. In view (il tin- la,t that the rii\ ulatin- s.ihati.m has alf.-a.lv 62 KhA i:\ ! ( \ wini: /'A' i( //( /•;. Ikvii i,i roiiiait witli thr sm.i iirlurc it iva< lirs the saii.i |.lanl. till- \-aliir Ml .liarurs uii.lrr pr.-smt r. .ii,iiti.,iis shows a I.Il; rr.lur- t)'ni,ai!.i rn.iii an s ^Iwl. snvcti-assay tlic pns.'nt rendition l;i\-,'s a ivturn m t!„. srltlrrs m| undrr I .-, ,lwt^, and ni lli,. tivattncnt tanks ,,t I I dwt , wiiKh. under o'd , ,,nditinns, wnnld. ni the latter, have luen m t lu nn-hl.. ,rli. ,, ,d ni 7, dwt. The sand-plant .nnsists '■I <.-lit -ats ni all. four ut" wliirh .are superiniiM.sed and are .ailed "'*■ '-'"lers- il„. t,,ur i.ele.w In-in- ealK.I xhv 't reat ineiil -tanks ' As a matter .>| taet. li..\ve\-er. snhiti,,n is l».,n'.,' piunped to the set- tler- a- well as to the treatnieiit \at- almost eonstaiitlw and li\- thi> mean-, m-tead ' •\ a ireatni.nt of lour da\s. which woiild have ol.tauied under the old system, a treatment ot" nine d.avs is ohtained. The sand idant i. .,nl>- responsiMe tor 111' , of the total -oM i-eeo\-- ery. whieh when s.'t a-aiiist the eost of operatin- the plant and the int. Test on eapual .mtla\ , at nncv pr..\,s it to h. a m.,st .•.xp.'usixe dei-artm.'Ut. If \hr int.MVst , ,n eapital ..utla\' an.l th.' a.tual op.'t-atim; .0.1. of this pi, -.t ;,e ailou-.'d as a .av.lit towanl th.' ...st "' ''" -li'nin-. It leae.-s a hi- mar-in in la\.ir ..f Im.' erin.lim^. and tn.' int.nti..n of th.' \\n: ^rs .,n this exi.l.'ncv is entirt'l\- to ,|is- .ard the .l.partni.'iit s, , -.■n.Tallv .!ev.,te.l t<..|,,v f..r the trealnient ot sand .\..t only this, hut th.- r.'si.Ki.- Irom tlu' sand-plant has mith.r tiu' . ■.insist, -luv n..r l!u- |..w valu.' .,f the filter press pn..hut. an.l sulti. i.^nt in\-.'sti-ation has l.e.-n .lone to imlieate that if coarse -^an.l 1„. r<'du,..| f, l.Vlni.-sh 11 .'an he lilter-press.'.i iustas ui'll as .irdinarv shm... The av.'ra-,' r.'sidue then, inst.'.a.l . if hein.^ in tin- lui.^ddi.irhoo.i ,if |_' ^r,-,. w. nl.l he reduce.! to. at most, si.x -rains per t. m. On a hasis of !m; tons p, ,■ ,lav passin- tlir.ni-h th.' tuhe mill th,.' lAtr.i r.-e.'mi,' w .^ j ,", l,-,s, 7.|. p,.,- ,kiy f,,,- ca. h mill in as,v 'idle d..luition -.'ii.'rallx- is that lin.-' rimliii- is a n,',a'ssar\- .omllary to ,n\- ni.'talh.ir-i.^al tr.'atm.'iit .i| R.an.l or.', and th.' .Aid. -nee l'""i'- '" ''"■ I'urther .■xtensi.in of tin-, principl.', l-'.sperini.'iUal .lata show that tdter-pressin- is .1111 of th,' most ne.'.'ssar\- ' ip.Tali. ms that has \-et 1,,','n inlrodu.'e.l int., l.ieal I"''"''" ''"'"■ l'"ints are th,' -ivat savin- ..f wat.'r. th.' increas.'.i extra, ti.in. the s.-nin- of eyanid.'. th,' ...moniy of li,,,,. i„ treat- ment ot shnie, arid ih,' pr.i.jucti. m .>t a li.'tter pro.juct tor han.llin- -III Hi.' slim.- , lump -rii, op.'i-at-n is .m.- ..f th,' v.Ty simplest" and ■■x]i,rien. . ,1 whit.' men wh.i ha ce h, en tiller pressin,- f.ir many \-ears ni W. stem Ausi r.ih;, .i,,- , mil ,■ s-,t isi",.. 1 1 l,,, ii .:,...;:...'. ^1 I ".V nil: K.WD ,;;j a'-,t,"'"ii a tiltfr-invssiii-^ liamlas t In- whiU' man Tlirn-asim \vh\- this nii'tluHi was not aihijitcd carlirr was ,\uv U< the Uar nf cxri'ssive tost. Our tiKurc'S not only (lis|inivc tins idia, tmt sliow that hltvr- piTssin^' is the ni.ist iniponant o|Kniti(in m tiic whole ran^T of truatiiifm Tiu' avcra.Lji' nsiijiu' Ironi sliiiir .lurini,' March at the Charlton contains O.USSd dwi. The tiiuncss ..f the ^n\i\ was 7."):{.- UtiL', ami the ainounl ot acid used 4.1ISN lb., e.|ual to I.:i(l4,i, p,,- ton treated: ami the amount of /in- u^ed :i,S:i4 Ih . \ alued at ' tiii ISs. The addition of a filter-pres. plant to the mill settles one jxiint that is usuillv sulijeci to inaccuracy, and that is the tonnai^'e of slime handled. The relation of (Xtraction to tons multii)lied by screen assays has not. in tlu' past, been so clo-e that this iiomt has come up for serious .lisciission. but in the tuture there is nt> doubt that more attention will ha\ e to be L,'iven to it Till' cos s for the n. th of March are as follows: I'lxt JUT ton C.iM |,,.r ti,n T'.Kil o.-t inilloi tvi-.-ilf.l I'iiiiniK. I'lnn-. IVriLC. TailitiK'-f levator 279 6.23 (>!>;{ Sand-treatment 447 gpg 14 (|s^ Slime-treatment . ;}()2 S.OH 27. N2 Ext fact ordiouse 4;j() 0.73 :;• that a plant .,n ih,. all ^ '"'='- '"■^'•^ '-'i'!'! ''■■ <':vri,.l runiplrtr at .■.nicwiiat Irs-, than •'.'■ ''"■ '"-> "I ''"■ '"-'Hn.trv .ati.l an.l ^l.vantatw.n -hnn-plams ■■1 ""lav, f. -ivc a inurh Ih-Iht aii.l tar niMiv rnnsistviit rrcnvny, '■"•' '" '"' ""■"■'^'■'1 at a :n.i, h I,,u,.r ...-.t. In tlir .IrM'.'n ,.| thr all- ■>h-n,n,' plant t h.- stamp 1 .att.Ty ,s Irtl uut . t if pnnriplr hrin- cn,>h- in;,' an^l -nii'lm'^' in sta'^'c- Tlir unnJm- analvs -, ,,r thr pn„huts sl„,\v s.mir rufi-ius tca^ tuivs Onrni l'a.t„i,lar,.tliat;:ir-ra,lin.^.,f as,.ttlf,l>aii,lis,,uitr ■l'"<-'vm t.-ni th,' ..n-au,n-, ,,t tii.- ,i,a,-v wliirh tiiat .an^l ivprrsrnt. unrn Ifan-trrivl fn.ni tlir tup ,,, ,h.. !„,,,, ,ni tank. It i. ,lil)i- 'iilt I.. .Irtcrniinr rxartly Imw this .■hany,. i. j.n.u-ht al.-ut; hut. as Ilic ivsuhs have Lrrn <■. mnvnir.j ni nianv invsti-ations. tluTr .an !.,■ n.< .pirslion that tlu' , han-.^ .Lts take plarr. It niav !„■ sai.l tiiat u..rk ,..nM n,.t iK-rarriol ..ut satistartnrilv withniu -Va,i- iiii; anai\sis Sli-.vtlv att.T starlm- thr plants, thr rrsj^lur xalnr. JM.th in thr shntr an.] tlir san^l plants. nrras„,nallv was hj.^h. I„ rsm- '■■'■"■■ " "■'" '""'I'l 'iiat hi-h rrsi,h,rs u-rrr .hir f. frasnn.: ' ^k' I'"'-'- ^"'■'' ''-^ '""''I ''''>i!.v !"' .-nti-nllr,! whrn ..hr ..prrajors ■la.l a lull kn.Avlr.l;,.r m thr r..n.iittuns Thriv is no rras.m whv thr lillrv pn^ss rrsi.lur sl„,ukl rvrr 1 ,r hi-luT than t; -r. .„■ the. san^l- nsi.inr l,r hi-iirr -ixrn that thr tnl.r imlls aiv rnnnin- than 12 .UT.. an.l this ,|„,,r apart tr-in ihr srrrrn-assav. Takni- thr rasr "t thr .Mrvrr \ Charlfn. liMurvrr. wlnrh ,11 Marrh had an avrr- a'^r srn.rn.assav .,! I(.s7l ^hvt , thr avrra..'r rrs„hu. u, tlu' san.l was 111 L;r. ami m thr sl„„r fit.l ,;r Thr prrrmta-r , ,| ,1,,. total pulp rrprrsrntr,i l,v san.l was 7(1 7(i:;. an.l thr shnir L") n.-,ll. This Uivcs an a\(ra'.,'r irsi.hir ,,| |2 :;<» ■J.r.. c'(|tial to an r.xtrartion on th sri'rrn assa\- . .t '.I.") :;ii_" llr tot; rlranrd up sliow- ;,I1 a. tual rxtrartion oi ll.V.V , I„ thj, ,,|a,u !Mi' , t lir.nvtiral rxtrar- tionsi|,,ul,n>rras,lvan,l consist, 'nt Iv rrali/r,l. and allowini^ tor l'', I"- 111 tlK s„,rl, an.] rlran-up, rtr.. thr art.ial ..oM i„ U,,. l.ank shouM hr '.I") prr rrni. Till- TRK.\TMI-:XT OF DKSI-RT ORKS IJUTK .':( 1!I(H, Thr |-;.iitor: Sir I li:i\c re, hi M'- l?(K(|ni's artiiK in Mnii' i-siir ^f .M,,\ _'(i. ill reply \n (iiif c)|' niiiH- in your i>-suc c .1 Arpil Js. an! iTa\r --imi-i' l" i"i'rtil'\- a K'W puims. 1 he term ■ilcsc-i-l orv' was nut used li\- nir as a tcnii i>i rlassi- ticatidii of i.rr, it nicmt simply hit tminil in .Icsirt vc^'inns. ami rcfcrrcil partii-ularlv- t" thr minliticins of t r^atiiu'iit tlim' I 'li.i not iTlrr sptiially t .K'^i np' :on ot th( ("oinhination nn-. as one in which the oxidizi'i] jiortion is imii-h lianlrr than the sulphide ore, shows it to lie an '.mutual oec'Virn nee. "'Idle latest ami ln'st praetiee in e\anidin<,' " i|uoted 1>\- Mr. Hos(nii. would i)e more eorreetl}- termed tht "last tashioii in eyanidini; in South Africa," It is notorious that what was called "douMe treatment" was lioonied some \-ears a'^o in South Afriia. and in coiise(jueiici' a mimlier of douljle treatment plants wce in- stalled in this and other countries; and they wcri' tailures. More recentlw tlu' Soutli African practici.' was to ili\iiie the puli> into ■sand' and ■slime' to lie separatelv treated, and this apjuars to \ .,■ the icU'al treatment for "e\ery niodcrn mill opi'ratini,' on a lo-ical liasis," accovdini,' to Mr .ios(|ui The most recent practice, however, at johannesliur;^, i-, to Ime ^riiid and tilter-])ress the wli..|e pulp, and thus '^'et '■one product in one opcratMii." the adxantaues (it which are iiio>t clearly and interestin,i,dv shown in the alKtrait ol Messrs l)eniiy^s article eiven in \o\ii- issue of |une 2 I sliail iKJt take up space hy replxiiiL: to Mr, Ho-,(|uis state- ments on ore treatment -eriatiin, luit I must tra\crse oiu' state- ment rei^ardiiii,' ■■the imjiossiliility ifroni an ecotKiniie standpoint) o| reducini: ore to a sutficient tineiiess to en aire the hepears to me that the ■liest pra> tice^' is to he aMe to inter- pi-et laliorator\ resalts on any ore, s( , as to install the kind of ]i|,int 66 A7-.( /■ A / c ^.l.\7/^'■, ri<.\i THE. omm.mu-allv brs; Mutr,] „, i,s tnatnunt. unhnu, ,vl\.r,.n,v f, what iiiav 1„ tl„. pn.rtuv in South Alriran or nth, r fiohls, ..thcrwisc. th.an tM tak,. a,Ivanla-c (,t nrw disrcvcHcs in -rindini,' macliiius, '■''■ '" '^"' '''-'■ "I I""-""-^ nxi.Hxr:] surtarr .r,v it appears U> mv that thr h, >t prarticT w,,uhi hr t<> . ru>h .h'v to a ta.rlv .oarsc tnosh aiM Irarh ,h,vrt ,n .ats. thr tVM.h.r lu'in- si,l,M.,)ucntl v ,ms.,.,1 "vrr ainal-anMtin.u phitc. or rotuvntrators, if l,nin.l to pav. In thr .,,s,. ,.| ,„x> which i-f.|unvs hn.-.-nn.lin- to ivh^asr thr n'lctals I wouhi tMU-.,M-in,l ritlKT ,h-v or uith rvani.ic s,,hition, a-itair an.l "ltrr-p,v-.< thr -.vhol,. pulp, thus ,^vttin- -.mr p,v ,,hu-tion in onr "I"''''"""" 'l"!"- l"-ini on whirl, I wish to lav niost stress was "''" ."■'"■" 'y'"i"l'' 1-^ "M'.l at all. it is ,iio,v l,,.,Mral t.. Iivat with .■vani.lr lir^t and anial-aniatr i when n.vossarv) altrrwaf.l. than '" follow the onlinars- pvocrduir. '■''"'''''■ ' "■'-'' '" 'Icpnvatr most stvon-^Hv the ,n -...iurtion -■I th- prr.onal I'lmicnt . a- s,, pat.nt Iv sh,,wn l,v Mr. Hos,p,i 1 takr It. tlicM' .lisrussion. .houM l„. pun.lv impersonal an,l tor 'nr a.lvan.vmrtit of thr art of mrtallu,-v and the infivst and m- strurtion o, v,,ur rradrrs, l,„t no, for thr vrntilation of anv per- sonal terhn- hrlwcfii profrs>ional i.u'n l^ikTN.\.\i Hint. San I-'rannsio, [unc '.t. I'.liiii pr(k;ri-:ss of c"^■.\\Il)ATl()^■ Tin- icitiiniiin (Jii I urnnt prac tire at l\al,','n(irli, li\ Mr AUrci! Janus, will intrnsi .yani'lcr-. W'r alsn [juhlisli a .lis, ripti, m ot a lU'W iiicthiiil of linini,' tiilic-niills. as iUmscI 1,v Mr il, 1', Uarrx . nt the 1,'nat Wailii tiiiiu , in New Zraland, Ont' (.f tlu jMaitiial pnihlrnis. rsprcially !u niilhncn i ■prratinu at a distanir truni nianiitactnnnLr icntins, is tlir cluaiH'st ami must .lurahlr linins,' tor till' tuhcs At tirst rxrvydiic (k'priKJcil upnn KclaU'l prhljlts ami sili'x liinnu Inmi Hun)]>c; and to those in rliai<,'r of nulls on tlu' Cither side ot the \\ei!er. f^.r tlu'V also were ukkK 1i\' nielJKjds not a\ailaMeat t iie ordinary niinin(^' to\\?i. Hotliin Mexiioand Xew Zealand the inili-manaKors have smceeded in hreakim; awav from the tyranny of a sjieeial material and they ha\e heeii aide also to procure Hints suitalile for tlu'ir jiurpose The device in- vented hy Mr. Harry is 'nie of the liesl inipvovt'iiients in tulje-mill jiractice. and. as it is ap)),, ahle to other localities, we hoj.e it inav jiro\e extremely usiful. In re.ijard to cvanidaticju j,'enerall\-. Mr. Janu's' remarks are much to the iioint 'Plu' fre(|uent comparisons iKtweeii the work done hy the pans and tuhe-mills at Kal,(,'oorlie lia\e exidentlv heeii of little \alue as indicating the .general ap]ilicaliilitv of thf two ma( liiiies. dimply liecause the ]jeculiar coiiilitions olitainin.i; at Kali;, ilie hax'e been o\(iiook( d Mr. James sets that matter riL;ht. His other criticisms are welconu'. .ind aii\- repl\- t" them will \iv i,'i\eii a ((lurteous hearini;. It apjiears likely that tuhe-mills will he discarded at Kali;(jorlie heiause the f-Ilurides o( curriiiL; in 'he ore re(|uire roasting; tile idea usc'l to lie lo commidute exci'ssix el\- so as to dissoh'e these telhi rides raw. hut now solutiilitv is secured hv ohtainint; the porous .ndi tion due to a roasi, I'ilter pri'sses are already a hack mnnher in Western Ausfalia. and elsewhere. Filter machines of the Moore, Mutters, and otlu'r tvpes are disiilacin^' the old devices. In fai't, cyanide practice is under(,;oinj,' a ((iinmual and rapid develop- 6N KhA l:\ I ' y.Wini: I'R At / /( /•;. """' ■"!,■ ,lrM,,- alUT aiL.tlur Inin- rll»,wr,l out of ih,. wav to 'iiak, n.,,,!, lor sonin liu,:; Ik-.I,-,- just nou u ,. „,a,nt.'>l tl,at " '^ >!i'Ml'aii,l l,v '"■'■'"'■'"""■ " '^ '1"' ""'>■ a M'n'stio,, ,,t rclatiw .ost iK'tuvrn !■.■ i^nn,l,n- ;./;,> slmic-tivatiiicnt on tlir o,u- iian.l an,l pnvolation "t thr roar.,' sMHt^ on th,. ..tluT. the assertn,. lartor is the incivas.' "t .vushni- eapa.itv m thr first nistanrr whnhrr un.ler stamps -r hrtuven rolls ,hir to n'h.'vin.L; the hrst erusiu-r of the u ork "M'>'lvcT,/in., < >n these snl,,eets we hope to hear iron, our fnen. Is Kxpennientsare.oiiMnuallvun.lerwayitheexehan-.M.fexpenenee will prove niutuahx helpful. w TLinC-MII.L LI.\lX(i i.hilv -JX. IBOiii '1"1p-i- whn n|iri-;itt Iiil.r niilN will mH 111' .] In lic I(,l,l (,I llie "■-lilt Ml a rlicaii an'l ihii-alilr lufiii i.t' liiiiiii,'. Ii.r iVi-, is mu' ..f tlic I'l-.-itii, al |ir..Mrins in llii^ l.ranrli (j1 inillin-. At i hr Wailii iiiiiK' 111 \r\\ Zialaiid. the tu!>r mil! ha-. jiroN', .] must I'lhctixc tnr rc- 1,'rni.lin- aii'l the ])ra(tirr has ln-rn .ic\ cIuiumI under the dirci liun "I M'' II I' Harry. !hc suin'rintciKlciu n\ unrks l-'(ii-nirrl\ at Waihi thry rrushr.l under stamp- \n lU-nirsh. and the liner the pulli di-^ehar-ed Inmi the l.allery. the hetter the extraetlun m tile eyanidi annex, j.ut there was a limit to line erusliinj,', I'M- lie \-ts n\ tnail.le and expense in ennneitinn with the iiniiiL; nt the tuhes tnr the cjistanee nf Xeu Zealand tioni ICurope represeii's a maximum leiv^tli 'jf transport. The silex fniiii leeland had tl: /7\ 1( //( /, \Vr .in nil,, nil, .I llial llir Wailii ,(,ni|,;m\- is iiiakin- t|„. ,..,^,. "'- "1 its,.u-n \.,nw\rv t,,r I.', i„.r,ui an.l that tli,'.,.M put .L-un I'T t,r,,k, II ,niart/ i. fatlur rx. rssix,. s, , t|,.,t tin- liiur , an !„■ nia,!.' I'T ,',:;(( Tlu' -avm- is alM,ut ,/,.'lil) i„.,- ,„1k' |„ ,■ aiiinni. as ''"'"■'■"■'■'l '" til, ■,,1,1 111, ■111, „1 A. til,- Waihi ,-,,iiii,an\ i. alH.nt t,, u-,' 10, ,r I-.' till,.- iiulK. til, saMiii,, will !„■ iiii|„,rtaiit . al,,,,,; >l,Villil) I'cr \"i'ar Wr ,|n,,I,' iu'nwith l>,,ni tli, -p.vili, atioii ,.| Mr iiarrx 's ''•■"'■'"■'""I ^'<>"nii,aiiv It uith lu,,,,t til. ■,lia-rains that a, . . .tiipaiiy I liat I laiiii t',,1- jiatriit Tliri,ui-i.,,s,.,,f !lns i,iv,.,u„,„ ,. ,,, ,,r,,M,K. a fluap aii^l ,'IUv- ti\f-nii,liii,;Mii-|a.,' will,,,, Hil„.-ni,lNan,l,,tluT, -rill. liii- iiia.lii'U's. I'ii; 1. 'I'liLt-Mill l.imn.j. I'l'ni. 'n lis ,,ui-p.,s.- is attain. .1 !,y litliif^ witliin tlif tulK'-niills shallow tram.'s ,„■ t„,x,s ,,| licxa-.^iial . „• iv.tan-ular t",,f,t sliapr,] as is luTcalPr tal.,1, ,„■ in any ,,tli.r shape whirli uill , ,,n vrnirntlv tit. an,i ,n lixiri- tlu-rrin a tiiat.Tial ,,,inp,,sr,l ,,f ,-,,i,-li l,l,,.ks .■t st,,nf <„• ..tlu'V sul,staii,css„ital.lilnv t lir i.ufiH's.-. Tli,' a,v,,ni- panyinu .Ira win- sli,.ws |(i ti-uivs ..1 win, li F,-, i is ,, .,p,„ j|]y^. tratm- a ,„,rti,,n ,,t the insi,].' ,,l a tnl.r-inill an,l sli.nvni- ,lifk.n.nt t,,i,iiali,,ns ,.t ii-ain.-s ,,r s.-nifnts .vitl, material tix I in parts, while I"i<,r, 2 is a iniss-seetion tlir<,viL;h A'-.V of Vi^. 1. Th,' tuhi-shell .1 ,,| the Knn.liny-inill is shown in \'v^ | an, I 2 m Ti;,T-T JTI.I l..-,.l- ,,">> il p., I U, III ID t^-^- f riHh: Mii.i. I.I \ ISC 71 ilhiMiali i!m .liMcn'in luniiatiuiis (.r scyiiirnls li UwA an.| wlm h iiia\ l,r lix, (i then ill. l-'j.^. _> l.rin- a . n^s s,i tion oiih , tli.' .Icptlis i>t till- t..rniatii>iis c .ail l.c lull\- seen while the r..iieh stones (' slidwn in l,i,th tij,'ni-es .(uite illustrate the aihaiita^e <<{ their nse I he traiiie an.l Imjx iMrniatiniis li, hereinalier ealle.j sei,rn,,-nts, are niatli with nr withcnit iH.ttnnis mI' irun, st>'el, ur nther siiital.le material an.l in eonxeiiient sizes shape.l tn tit iiisiije the tube mill, as shnwn in Vv^. I an.] _', ami t(i retain the liniiii; material in p.isi- tinn The seLinieiits /V nia\- lia\-e rihs nr l.ars /; piet-rahly shajie.l arniss \,, lu.l,, l,,,],i (]„, lining material ( ' in j.hue and so as to limit an.l re.liiee the si/e of the sei,'ments H int.i smaller c oin- partnients E t'l suit the partieiilar nature ot' the liniii.,,' material use.!, ..r ril. or l,ar I'l.rmations /; may he use.l l.\- themselves with- 'lUt outer trames. Pig. a •'i.i;. -. 'ru'.e-Mil. l,niiii'^>. Seeli.iM. ^'" '.>-■ The oiitsi.les /•' (.t' the sei^Miients H may lie tnrtned plain ami iiia.le t.. tl;e ra.lius of the tulH-mill and so form an anh wlii( li will key ea. h seL;ment B in position, or the outsides of the seK'ments H ma\- he raM,et fornieil so as to interlock with .^'rooxes llierein mt.i whieh locking' bars of iron or sti'cl or other suitable material may he put. The setjtiunt'^ /^ may he holted or otherwise suitably eonneete.l to the tube-mill, hut as a rule this will he unnecessary. To jircjiare the se.;ments /•? f(,r use they are placed ujion a hrm surface approximately of the same i-a.lius as the inside of the tube-miii wiieii they, the sc.i^nncnts H. are well tilled with the lininjj material either in the form of concrete /\' or of roui,di blocks of stones C, the stones beini; iamnied in tij,ditly and the interstices betwecTl t hem l.i.iti.r tlll,.,l ■,,,.1 ,- ,,,,.] ...;.i ■■ ' • ■■ It : ; ', t :;:e:; L , v'On^Tcrc or ci'nient mortar M or suitable material which can be poured A/' < /A / ( )\\ I HI- I /•■ U I It I- in, in tin 'I '^.Toullll'^, II tl -iiiall Til, ! -|Mi 1 ■- 1"I \M(n I h. -1. iiics iniii'^' malriial iiia\ !„■ \\\,:\ ],, i, '"" '" ' '" '■'■-' - '"1.1 It uill ii!vtrr,,l,h !»• mail, r 111 lITfj^'llla!- f. i ill lllcrcl.\ pi-Mtci I ihr . .lu ipiUr IMUL,'!! pPMcrt ^ It'- irnijulaf Millar,' a^-ist I lie -nndiii'^ mill "v ma. Inn, lii liar.l n.i k iiii.j inatrrial tiiav 1 iiialtvi ,' that uill ,1.. i|, -rL;ni(nl /; an.i ril. ■ Irnin nil, ill, \., ,ar apaciiy ..t ill,, till,,. I' "I i|iiaitz "ir an\ Alt TK n ,nni-,-,l ,,(■ ji < r .,; 1 \ 1 n l; i 1 '!■ Hill. r,t, A' !<■ i',.iiirnl , ■nil. Vet,. . ir t| f ' cniiiit 111. .rtar M "■ "' ii'T llniiii; iiial.rial 'I'lic t.. s,.] |,,,,-,| ,!, ^iiiriitN /; 111 t i.i' M-.^^'Illi'iit- /) a:ii].|. iii.a.liiii,- with c.nirnl ..r nil •"•<■ l.iMit int.. t!ii. till.,- null 1... km- 1. "■'■ -iiilaliu l.in.lnu; mat, rial an.l tl ir^ arc .lri\ , n in l"iiii.l a.hanl^ '■^ lu'ii |. .1111.1 n. thr '!■>■ tl. iiN,. 1 Iicm It the till ! Ill' •'.■L.tiiriits H ma-, I.,' laiill mt. "■ """ '"■ '".■"■""II' v ma. liiin- hil; I,. I- >,)nu' tim,', tlu' 1 I'XaiiniU'.I. an.l it :iii\' ..f It is I'., mill tl. 1 imn;,,' maii'viai -liniM 1, ,' lault\' ,ir nnlit |.ir u-.t llu' M.,L;m,.nt H int.. whuh it i-, i,tt,'.l nr r,x,'.l ,'an 1,,- iv uuvA 1,. liaxiii- th,' laultv linin- i'liii,i„,l, l.n . !■..„. an, 1 tak, liiiin.^' mat, 'rial till,..] m. in tl 11 i.ul an.l l'r,.-.Ii I' tiianiu'r alr.aih .li'scril.,..! C'RLSIII\(; A.\|) CRIXDIXC, I'RAlTKl-: AT KALCOORLII-: li\ All lU- II j Wll .^ ijulv J>. Iliot, At a inoHU'iit xvlirn ..,„■ h.^ars s,, „„,,h a-, t- the n-latiw a.l- vanta,;,.s ,.f stamps an.] th. l,all nulls. luLr tnills. an.l pan,, on. is apt tM ,.vrrln,,k thr particular pra.ti... uhj,], has 1,.! t,, tl„. ,n,n.- '1">""" "I a sp,,,al tvp,. .,t inaMnn,' u< , 11,., i a rrrtam Irtinitv '■"'"'""•" "" '' '1-lM.itr > lass ,,t ,,n. Thus, tor rxamplr. pans uvn- ">"-'"l'""l at KalL,',„,rl„. „, .,,11,., t .,,ars,. ^.,,1,1 ,V.,m thr turnare I"-"'lu, t. t,. v;ct n,l ,,f s,,lu!,K. salts t„.t,,n. , vani.luiL;. an,! in -Tin,! .'.ars.. ,,n s.nt.Tci partulrs ,,, ,„■, F,,r tins purp,,s,. patis have i'n.vr,] tvinarkal.ly s„.,.,...,„i .,„,, ,,- ,,„. all-r,,ast.n.^ pf.Kcss ha.i .nntinu,.! un,hallrn^,.,l. pr-.haMv thrv wmuM havr tnamta.nr,! th, ir sup, lioritN- un,)ucsii,,nc,l Hut the a.lvrnt ,.f Dr |)„.hl an,l i,r-m„,-,vani.|,. rhan^r,! all tliat. or rath,T, t,,r a titnr. thr,at,„,.l t,, ,1,, s.,, I),- l,„.hl ,lait,UMl tu 1„. alilr t,, ,1,, away uith n.aslin,,; .ntird.v. an,l to attain this „\,- .l.vt a new type of ore-rr,!,., in- ma, Inn.- a tine slimrr was mvi'S- sarv. an,i lie intro,luri,l Uw tutu-nnll for this purpose. It IS mvcssarv at the ..utsrt t,i l-.ar this ,listincti.,n in inin.l, lor It tlu- all-p.astm.i: pnuvss l.cx.m.s ,,me more universal or if It IS p,,ss,l,le l,y ,l,,ser ,.r imi,r,.v,Ml ,oneent ration to re,hiee the retraetory material (that is the sulpho-telluri.les- in the pulp to an inappreeiahle ,,r immaterial am,,unt. then it mav he reas,>nablv .■x,,ecf,l that, witli the al,sen,e of tlu' n.vessitv for tine-sHminj,'. pans will pr,,ve a,lvanta,-eous rather than tuhe-mills on aeeount of tluir l,,wer h,,rsep<,uer ,,er unit, their .-reater convenience in work- niL', their capacity tV.r amalgamation, an, I the Kranular nature (,f th,ir pro.iuct. These remarks refer to the Kal^oorlie practice onlv a.il n<,t to chstricts where, tor e.xampl,., the finest cer I. .11 .nislK.l. \iel.lin- a> tlie\ .].. an ..titpiit ..t tu.. i.nis ,,| liani ..re per h p ,\.i\ tlinm-li .id i,. til iiu >li ..r .'\ t..ii- per li p (lay thrc.ii-li a .'.". ii'< sli -. n , n a r.. ..nl imappr.M. Ii.mI 1,v >taiiips. wliieli rcpiire re ■^■nii.lin- applian. .■■. al.s..rl.ni- e. ,iim. leraMe I".wer wlieii larire ..tilpnts ,7 |.. 10 t.'iw per statiipi an f. !..■ at - taitie.l Til.' Iie-^l jiraitu.' kiMwii I., the writ.r in llii> .lir..li..n \vitli til.' ..riliiiar\' -raviIatiMn s|,Mi;p i> :;:;t; i,,ii> ,,,ar-.e .ni^li.'il l'\ 111 ^laiiips i,'_'.-,n II, |,,r |_>() li ,, ,,]„, .,„ ,,^,,.,, ,j|) 1, |, |,„. ,1,,, lull,' mill n,', ev^ar\- i., irn-li tli.' _' III |..ns ,.,ars.' pr.i.lu. t t... -av , •>!• 1" III tiu'-ii. ..r iKi.ler tw'p t'.iis per h p .|a\'. It thn- ap]..ars that -laini.s will I..' prelerr.'.I ..iil\' wli.-ii il„- "iv M.'l.N a ...iisi.l.ral.l,' pr..p..rtr.n ..I -.,|.| ,„i i lie plal.'s aii.l w Ii.ti '■"•'^"'1'-; '- '"" '" 1" a.|..pt.'.l At Mr.,k.'ii llill, uli.'i'e til. 'IV w n.. aiiial-anialMii, tlu' eru-liiii- L.'iii- i.reparat..r\ l., uet ...ii..'ii- "■■'"'•'■ ''■>'."■" '■"•■'''! IT.'l.-rt.. v.-.'t .ru^h iii liall mills ratlur than stamps, l.iit Milh.'U'iit .lata ar,' n..t yet a\'aila!.l.' t-. I'staMi-li tile I'. .iii.im\' ..f thi^ pra.ti. .' A- t'. til.- rel.itu-r ,';"li,,i,.n. \' .,t ilu' Kail an I I'.riUm mi IN. apart fn.m th.'.pu'stiMiis .,1 ,-,st, p,,u,'r, and r.'pairv t h.' r.-^'ular -ramilar I"'"'""'' "' 'I"' I'^ill imlN appears s., nui. li superi.ir jnr n.astiii.^ piirp.i-es t.i the ..'m.'iit i Ime pins cars.' .^ramil.'s . .| ih.' Crilliii mills, that It l.Kiks as il tln' latt.'r w,u\.\ n..t ..mtiiiiU' in ta\..r, th..u-h ..11.' ran .put.' nn.Krsian.J tlui-- iiisiallat r .n vears a-., wh.-n .li-\ . ruslmi.^r r. •>iilts wt-r,' l.'s^ .■■^tallIisllel| Airl ii..\\' as t.. pan- \,'rsn- tul..' imlU It" 1,,'tter .-..ii.'entra- ti..n ean sh..\v a r.'a-. maMy l"re,' . vani.liii.,^ i.r.i.lm t, then tli.- iie.'es- sitv at Kah^'.M.rlii' |.,r tul.. imlN 'lisappears with the the.irv ..f a <.miplete n..ii r.iastiiiL; tr.alm.nt, win. h. as stat.-.l ah.ive.was the pnniar\' eanse ..t t h. ir a.L .pti..n lint it is l,v iv . nutans x.I .leci.ie,] rather the re\ ers.' that «. .n.. lit rati, .ii, as pra.tise.j in tliis .iis- Iri.t. 1- \'iel.lin.^. a pr...lnet .apal.le .,l" heiiv^ l.r<>m.,-('yani.le.l with- .'nt the \-erv tmest slimin',^., sn.h as it appears t.il.i'-mi'ls ..nl\' .'an a,, yel a.e..mphsh. Ii -ni-t l.e rellU'ml.eiv.l thai e\ell ihe lillest shnimi,; -;i\cs nu\v , . .mparatix el\- fair results ,„i t],,' material tliat is l.r..iiii. . vanrl.'.l It was tlu- atnal-ainati„■ ,,^ I V r.Mi!,. as ;,,v .li,,w„ |,v Hiu- ..t thf host kn..un nnn,. al Kal,.,,,,;],,. |.;,,„ ,i„,„.i, ,ii.- '""'■ "'' '•''■' •"'"'• '-^ -up|M,M,l In |„. p.natn.h in. tr. .in r.-tra. - '"'■'- '"'"■■'■•'I-- tlu- ivsi.iiu.s aiv npiii,.] f. Im. tl„. 1,1^1,,.^ in ihr liit;ility L'l .1\M p.r (Mil Stirclv, m ...niparin.. tl,.. nl.iu,. , „ irn, i.s n\ pans an.l '"'" """-■ ■'" in,ll irst pnl.lislh.l l,v tif hanli..,. fMinpain ()| what valu.^ is a l.Vl nicsh """i"r.n,iv!...inl.alin^uitiith,.,lassii„aii,,n,,; ml,,, nnll |,r. ,.lu,.ts:- I'.ul uill, n..^.ar,l f, tli,.s.. t.st.^ tlu.^ «.■,•, n,,t ivt-.n-,,! t., ni,,iv '''■tinitrly ininNT,.inarks|,„M,-h,,l j„ //,,. /,„,./,;,,, ,„, ,,,, / .i/,,,,.,,^, J.'lin:,,/. l.,..ans,. ,t v\as ,M,l,.„t i,-,,,,, ,!„, nmiial ur..n..ss ,,t tlu' nu.th,„ls that th,. n.sults ,,| th,. t.sis u.iv unu,,rtliv ,,| s,.n.,us '""""''■'■■"'"" ""'■■- 'liiH" iv-ivt was that nain,.s n\ s,„ 1, hi„li Man.lin^ sh,,ul,l ha-... l,,,,, ta. k,.l .,nt,, tr-ts s., l.a.llv .am..,! ,,ut, I,, ih.,s,. .,,„N..rsant will, tul... mill w,,rk, it is unn....,.ssarx- t., insist "" ''"■ •'''^"'"''- ""■'I "i k,-..,,-,!,^ th,. t,....l pnlp livr t,-,,iii slinu- .""1 t.,r takiii.^ tlR. (inis|,..,l pr,„hi,t awav ip.in th,. mill iiniiu..liat,.lv n 1- l,.ini,..l, l,nt thr I\anh,H.n.,t ,,nlv in, lu.|,.,| a hn...,. pn .i,.M-ti.,n ';' -'"'"■ '" "^ '"'1 '■'•turnin-^' thr tinishcl ppHhut t,, tlu. nnll insl.a,! .,1 takiiiL; it awav at ..ivv hut. l,v tlir int,.rnu., Hate ^\'^rkuv- .,1 tin- l..st . n, altiinat.' .lays, a.tiiallv lia,! th.. flints i-'>at,.,l with ..lini,. at I h,- start ,,t' (.a.li ,lail\- t>.st U,' lia\',. tlu. ..\tra,.r,linai-\- p.,siti,,n ,,l' a man wh,, .lis., .x.^.ps tliat an ,.n..mial f,,,! ,,v in, ,iv t han -'(> t,,ns p,.r ,iav . h,,k..s Ins tul..- """■ ;' Uiallv t,.,..iin^ n,, kss than MTT t,,ns'.,i- t,nislu.,l slim.. ""'•'■ Ilian I.-.d-mrsl... , „■ ni,„v than 1,.. takrs ,,ut , ■_':,!.-. t,,nsi l-r Ills ,lailv ,,ulput, C.nhl anv ,,n,. ,.xp..,.t a mill tlnis .h,,kr,i t" 'In >.|l,...tu.. w,,rk- Can aiiv.,iu Unv^w wmvlrr whv th.. ivsnlts ^l."w ..niv a lVa..t,.,n .,f th,. w.,rk ,l,,n,. p,-,- h p. unit .-..nsunu.,! >";"l'aiv,l with that ,l,,n,. rls,.uh,.n. l,v th,' sam,- h,,. uait ;- An-i s,, it happ-.ns that wc hav,. s..,.n i.ul.lislu.,! all ,,v..|- thr .-arth, ivsults '■\lii,.h must !,,. .In,, t.i th,. ..nthnsi-.s,,, ,,(•;„,.,.,„..■;..„ . ,- , i ■'"■■'•'■' '" ''"--^IH lU n. .. lath^.i t nan t.) any att.'mpt . .r .Irsiiv f . .Klihcrattly misl.a.l. Tlu. artual .jaiiy p'-^^'l"' tiou ,.| th,. tul,,. -mill rlmk,,! with Im,. slmu. was ..hIn- Iti.Ti t..ns ..t ' l.",!)' slim... altli.-uL'h th,. .l.-.ilv ■■input i,uiu,hnL,' tlu. ivtuni,.,! slim., n.-.^nmiul 'vas n., less than y''M\ t.,ns. C.ul.i an\thin.u t'^ nu.n. misU a,iin.i,' than ti.i,'uros ifl ~t 7(i Ki-A i:\i { )\\\iiii: ri<\i rn I-: nri,l!iiii. \,y rrturiiiii- ail ills Imislir.l pf.i.knt. thus pi-M\)ii- tliat thi' tiil.c-iiiill was /i.>in- m. w,.rls at all' I he trsts w,-i-(' tlui> unucrthv nf srriinis in, tire inainh- lircausc tile la.k nt' ii]i|,.,riutiil\- fur the irvr r-,c:i].l \\hi. h is the .inlmary e.,st the r.'lative e.,sts per t.,n L;r.,un.i are .S.NCiil. fur tiii.e nulls, as a-ain-t lO.lil'.l with pan-. In tiiis euniuvti.,11 II is euri.ius that in Westc^rn Australia they sh.,ul,l still us.- .a-t in.ii linm-s, wlm-li appear t., hax'e l,e< ,nie.,l,M l.tein , ,t her pl;i, . -, Inth.feeeni .iis(ussi,,n at [..han- ne-Kur- Mr !.e,tp,,l,l, i,,rneral mana-er ni the Treasurv miiriusm- the Krupp tuhe, stat.'.l that !a- i'ntirel\- e.,neurre.l with Mr I»"whn- a- to the superi,,rn\- ,,f ihnt liners, '•whieh r.,mjhlv e. ,st i>n.' half an.l last twin' a- l.,m^ as the .hille.l ir.,n unes." I'ans hii'.c |,ru\e.l ihemsrhes reliahle, ,;fiiiii.,n ..htainin- l.,eall;, a- t., t he \\. .rkitiL; .if pans X., i w., nei-ii- l".nn- metallur-i.st.s seem.,1 t.. he .,f the sa-ie ..pim.Mi Thus'at ■"«";■ • • T ( AV ■n7//.\V/ . 1.\7^ ^VvVA dim; I'K, u 77( /•;, 77 ","■ '■'■■'"'"■' '■!"■ >"i"|unsann--va.i,i,'ht nn-s aiv lijcrhlv ,l„,u.'ht "': ••""! "Huh l,a. iKvn ,,ul,l,sl,..,l al,,,,,! ,1,,,,,. hut at' thr ,u.xt I'""'- ^.Miol. I was infu,.m.,l that th. .n.np.nsattn^-u,,^!,, rin^s ';^""""> ""-wn out. as havin,,- ,,n,v,,l ,,f no a-Kanta^o uhatrv.-r ^'"''''^^■^' "'">'• ' "as t..l,! ,lu ,,1,1 nn^.nal S-lt ,,at,. t.rst ,„tr.,- ""'■''' "'•■'■ ""■ ''>'^' 1'^'"^ "" thr iul,l. an,l th.s,. v,t pans *'"''■ /'^■"'- ■■"'"1'"'' •"•• "•«• ni-st ,v,.nt plan,.. Tlur.. ,. n,,.,] ,,„■ auth,.n,at,v,. u , ,vk t„ in- ,l„nc. in tins n.att.r, an,l I l„,p,. ,l,at AK'Ssrv kh„ an,l Tavl,,,- will ,„„,inur tl,.„- valuaM. nnvsti..a,i,ms mt,, thr su!M(',t. , „ -V' "'■'■'"■- ''-^"It nf the. intr,H),„.,„,„ ,,f H.vtn,- p,,w,.,- is that '■-"-"'•lis ,.\,.. .-,, ,-„,„u.,-ly ra„.,i ., 17 to L'4 h,p. ,st,.un. arc ""^^' -'"■'' ^" f"l'i'. u.l.vtri.-. Asa littlr„v,.rL'(l() 1, p, ,.t-an,, is 'unnn,,, nui. „| ,h,-sr m.lls at KalK'H.rli.- wuh thuv tans an,l all tlu' shatrnw, an,l as 2t h.p. ,s alH.ut tho highest ti^u.v n.luatoi '"'■ '' -N- •' Krupp mill witli full diai-c' an,l running ID' ,,v.t ""■•mal .p-v,l an.l in,h„IinK shafting, vw . thr,v must ruluT 1,.. ■■' '•'"'- "'■■''■Iv p,„,r <.!(i,,i,„,,, „,■ ,,,^, ,.,^,^,,,.i,. ^,^,^j^^_.^ ^^^. ^1^^^ ^|^^_ rlcitru- rat in:,' is uiaicuratc. I'AXS \-. TL'IilCS Tlir l-Mnur: ^i'' It li;i- 'Mcuvvcl Id nil . ill tlu' rasr ■>\ many -.i' the .■mitrd- \'rr--ir- i.\f]- tlic rc-iK-itiM nicrit-^ <>i ^riii'liii'^ pan-; aii'l tul.c-niilk. Iliat no rral liasis Inr ar'^iiiiifiu wmuM It Irlt if in,, it al tiiili, hi \\>Ti' I'avi t,, ,l<'l]iiin,L; llic 'v,,rk t'l !,<■ i»rli iriiu,! 1,\^ rarli iiKu-liini'. I-iir iii^Iaii, r. i-- liilal --limiiiu ^ >l t iif , mt the prim i|ial i "ti-i'lcrati, m. ■T i- -liinin- "iilx- \n \n- i hr unal ^ta:^c in iIk cni'-liin- ]>:•,,< fss. - In the 'rraiisN aal. t, ilaNliinin- ni- at Ica-t intal lin,- --iti'liivi,' — "t the >lainii-niill |,n„hi,l s.-cni- t,i hr the ,lt-irr,l ,r.,l. wiiilt- in Kali^oiirlir stainp-niili ],ra,li,-f l,.ta! Nlimin^ i-i wanti-l ■,ril\^ afti-r a iircliniinarv mm rntrati,>ii has Ikcii clh , !r,l, M,,ih -rii^Iinuiiaiis a'1,1 uil,r-niills arc in use hrrr, an,l ra,li tilN satisfa, t, ,rii'. iis own I"'-iti"n in ihr -.■hnnr ,,t I rtalninit , 'l"hc intr, „lu, ti, ,n , ,l' the ■^'rin,!i!i,^' pan mi,, ih,' niilliiiL; pra, li,r uf \\\st,ri! An-falia was uii,l(,nl,ir,ll\^ riiir. in ihi' lirsi |,Ia,r. t,, a .Ic-^in' t,, hiwir tiic Ivcat- ninil cisis ii, wcIm rushiii- mills which wcit nsiiv^ the hviiiin- ,'\'ani.lc ^:-,iicss 1,11 >ulphi, ti-ilnri,ic . ,ri>s Its snci,'^-, m tiiis partiiiilar tun, lion has Icl t,, its ,Ir\rl, -|iin,'iil as a '^riii,:;n- inarli- inr pure an,] ■^iinplr , .11 many .hlhi-cnt . lassrs ,j| mjts '[']],■ ,-,,n 'hl;,iiN 'vhiih intr, "lur, ,! the pan wcit : I A lii'^li ,' aiii,lc. '■> An I, IT. til,' \ a hi a 1,1 1 ■ ;,,,rti,,ii ,i|' whi, h was in,,-l ^n-. cptililc t" sliniinv. J I hr lie, r-.sil \ ,,1 vr,luiiiv^ t hr ,-nishril iiVi- tV' nil tilr stamps, tn a si/.v whi. h w,,iil,l tnr ih, iinmTal partiili's |",.i- ,,.n,, iit:,ili,,n. witli tlK- crcati,,!! ,,f a inimimim pci\ciitau;i' "t slinu-. Tlu'sc (i,n,li;Mii- si>,ni s,,nicwhat , , ,111 ra,li> t, ,r\-, iiia-:r,m h as ,U(i,Mi r,.nr,iurati,,n practi,.- .Imian,]- that ihr mineral he sa\-c(l in as i,,ar-c' a r, in,liti, ,11 a-~ pn-,sil,|r. while ,,n tla ,ither liaml a lii'^'h e\lraeli,,ii tn.m the n,a^te,l cmiciil I'ates .l,'nian,N that ail mineral parti, les 1„. , mshe,] MihH iinl l\- tine f, tV>c them tnnn I'.WS :■ TCHES. 7lt cnclnsuiv ni L:an<:,„. n,;,t, .,■,:.!. It is. hoNvrvcr. tlu> vriA ^wnllut "I lnn,n, m tul„-mills. w,ll not prove more reo„,,m,eal than .lire, I Minim- ,,| tile wholr pro.liut in tube-mills, Tlier,. is no .louht. '',""'■",'■■ ''''"• ''-^ >'" a.ljuiict to a stamp-mill lor the purpose of mvmv inereasr.l efluieney to tlu' stamps l,v allowi,!- the use of '"•"'"'■'; ^; '■'■'■"■^. ""■ iiel.l for l.otli these iiiaelimes. usr.l in eonilmia- ti"ii \\i,h ea. h other, is a wi.ie ene it 1^ the -^ueeessful .levelopment ot the urin.lin- pan wliieh lias enaMe^I the v,et-,rushm- nulls at KaiLroorlie to survive the mereasmu rompeiition of the .Irv-erushuv^ ,n.l roastiuK mills; •""' " ''■'-'" '■" »'"■ '■'"'''■ factor m uiereaMn- output an,l .livreasini; o)sts ot the stanip-miils at the (piart/. mines out-. 1 ■ ,,f Kali^oorlie"^ 1) 1'. .MnciiKi.L. Kal-o.irhe. |une !l. lltDti ',*■. ZIXC DLST V. SlIAVIXG .\uifii-t IS liini. Tlir Ivlif.r- Sir- Dui-iiil; tin- hist k w \iMti !.i xisu iiiaii\" I \aindc iilaiil> in .lilTrrriit ]iarts uf \\]v cuniitrN . and haw nuird with L;f('at mtt'Rst the nuthiuls iniphnrd m diricrtiu sritKuis. While m thr Hhick Hills a k'.\ \ t ars ai^c i 1 mKi i-\ i d with L;riat satistarliun the apparent >iur( ss (if zine-dust pni'.pilatinn and ncitunl ■\iih what temioinv m lal nr L;reai vdlunn-- uf >..lutiiin \vi-rc liandUd. The ■|uestii>n ariso m tn\- mind, \\'h\- i^ /.iiu -dust pneipitalidii iV't iiiiirc u!n\'rrsall\- (inpluyKJ- All i\ anid.c uprra- Inrs arv will awarr ni the -^n at anioum uf laliur m n s-ai''. !■> kta p zitu diiixts pr(ii)frl\- drcsM'il and in •^na,'. wcirkins,' nrdir, tn --ax' ii'iihini,' lit tln' lalmr unshed in the iiKinthh' nr ln-ni. mi lil\- cleaii- iiji In ptiini cit (Tiiniinix- in lalmr. zini dust pritijiitatinti rrnainh- has thr ad\antai;c (i^tr prrcipitatidii (in zitU'-shaviiiL,'-. It it is all that (.-(luld he desired 111 (ither respiM'ts, win- WduM it I'jit he ee(in(iin\- t(i desii,'!! all plants nt' nidderate size \\-ith tlii^ prueiss- I think a diseussKni of 1 he sul.j,'(,t !,•- those t iiiph 'V iivj the priK-ess, ,ui\iipi4 li.Ljures as t(i ensl (it installalKm and oieration, (-tlu-ien(-\-, ete., uniiM lie read with 'jn at mten st hv (-'"ailide "]i(.'rat(irs. C'\.\Miii: Max. ('•(.Idlield. Xe\ . jtil\- L>S. \\HH\ Znb dust preeijiilatidii in evanide wnrk jnissessc s distinct ad\antaees (i\er ziiie-shax iiii.'. and has 1 i-en enipldvc'l wmIi marked sueeess at the . \-amde plants (it the Ilnmestake Ciimpar,-.- m the Black liills. This pidcess was i'\-(i|\...d lin re alter diliu'ciu stu.h. ''"• 'ill the details iia\-e ne\-er heeii '^'i\-en Ki the puMn . ar.d it IS iidssihle that the siu-cess (if the [.nicess at the Lead Cit \ idatlts inav depend npun sdtne impdrtant trick (if nianipulalidii u Inch the niana,L^enu-nt wishes tc (dncial. Man\- attempts ha\e he en made td Use the pi'dcess at dther plants. Put withdut suci-ess. It would lie dillicult td assi-;!! the i ause tor this failun It ma\ '"■ '•"•' '" '!» filu'tanee (if (iperatdi-s k. sujiiilant a suiijile and /f.\( ncsT ;■ s//.wi.\(;. SI rchauir j.r.Hvss h.r ,,n.- < i.iiiparuti wiv conipiuaicil and umrirci: hut It WMuld sci'm t,, \,^■ ,\uv ,n sonu- instatuvs to unt'a\i,ral,k' con- diiiuns lur pRTipitati.Mi, .,r it niav \k- altoKcthcr <\uv U> havitii; niissf.l tlu ,,m- I'catmv essential tu svucrss. as known onlv to the H.Mncstake oprratois^ '1-hc reason lorthe continued i.opulafit v of zine-sliavint; is .ihviou^. The process is simple and appeals to the avera.^'e intelh-enee. We join with .,ur correspondent m his uoiidernu'nt at the si(,\v int roducti.m of ; iiKikr 'ainalL^aniatinn. . nmcntral im, . ami r\ an tile tot ' tmh trnmnc tlu- l.rM |M,ssiMr cxtrartinii nl ,t ai iKil ilc . •riif tcM -a \V 111. tnllnw- I"'- n>-.ill^: ki n.xrn il 1,\ amal-ainatmn . :{•_",. 1,\ , i m, nit r; - "■'11. Mi.'',; aii-l l.\- r\ atiiilalinii nf tailniL!. U\ r.' , , iiKakin- a n 'l;il mnvrvv n\ !i.", [iiT mit ■I'll.' >iim( III fail was vrvv lii^'li -i;railc Ik'hil; . .\-, r s.-,(i(i p,,- """ '"!'' I'l I'l-i '■•■iili'ii y , l,v \\rl,L;llt nt tlu- nlT lakiti Atl.r i-nMll.lrllllL; lliis irst, I linnlnl In t rv .IlIT.I rxailli lill- n| i b,- niv alter .lr\ -rrusjinii; I lie u Imlr n) ,- [,, |(l()-„usli. wiili il,,- result tlial i nliiamnl /■ DI-.^l-.KT "Kl-.s, s;? MTli CUT l-'it , M xiiiir 1 \ aiihlc-aniirx . ami. ri(|uiniii; l.ut ..lie . ivw ot inni, 11 \\,,;,1.| IV, hi.,' ilu- niHralin- c^ts iiialrri- ''"-^■- ' ''""'■' '!"■ a.l\isalnlil\- n| tnatm,^ the iiia.innt\ ,,1 uivs n; 1m,iIi saii.l and siuii. planls, su. h |,lant■^ m iii\- n,,ini,,n l..in,i,' Miital.lr ..niN tu lailm- pilrs wlinv thr rni.liin- lias alrra.K l.i'cn ''""' ''■• "1"^' '"'<■- 1' a I'lant i-- ii,-,,^sar\ t., treat t lir sliiiu' win II rnishiiiL; r.iai-sr. it will pav i,, sl„,u. ..\vr\ t hm;^ and ifiat altM^c th.v thus (.iiiil.inm- all thr work in <>nv plant with mn- ""'■"■ ^'"'' ''" ' 1«1h \c- m tlu> ..•lur i.ra.iuv i xr. pt m laiv ra>,- .,t inishiiiL,' all tlu- ,,iv t.. a .MO-nirsli slmuv Tlmsc who liaw hail In op,. rate hltcr-pn ss^s or tiltcnn- ,1,.m,vs ivalizr thr ihlthiill\ of tilicnn-. ua>hin-.an.l iriiinx mi,' rakt s of l>(»()-nu sh ^hn)r. wh.l, if all the o,v i> chisIumI to 11)0 nush. a','itatr,| as on,. I"-'"lu>t.an.| hltrf-pf, ssr-1. the ixtra.tion is n,,t mat, fiallv iv- 'lur, ,1, sa\, 111 .■xivpti,,nal , asrs an,l the .•ak,'s , an \,v ina,lr thi, k.r an.l ,ln,r. an.l aiv rasih wasli,.l an,l iTin,,\,,l in fart, s,,tiir |,t t!-„. 1), w imss.'s ai-f so roiistrmtcl that niat.Tial of this kind '''";"' 'il!''i''''i. wasiu.l, an,i shnrci ,,ut aui ,iniat i, all\' with,,iit ynlaihi/j thr rxi.rns,. of .,p,.nin,u th,' pi', sscs 1« iw, ,.n ,.-,rh ,'hani,'li.,n than if all is ,ruslH,l to pass .'(Kl-nush , \\w p,,ssil,|, <-x.xpii,.ns aiv sul|.!ii,irs ,.r prviiaps a >k-an si:u-i,,us ,.n.. fu,. fp,,n aiX'illai-i-ous matiTial Mr lios,|ui. in ad\-o,atin- wet inishjn.^. and amah^'aniation m.'inions ,]„■ ■'.^Mvat a.i\anta,.^r of l,rin- ahl,. i,, s.vuiv ,l:ulv ffoin platrs .-,11', ,,f the ,/xirarlion .ditaincd frnm s.-,() ,„v. as ,,impaivd with waitin- tor the tr.li.ius niont hly , ,r l.i-mont hi v ,Iran-up in a c'yani,lr plant. ■' I ,,..nt.ss that 1 ,aniiot srr this a,lvanta,u'r, CnishiiiL; tio f. 7". t,.ns per day an,l nvo\,rin- .sl>.-, p,.,- ,,,„ .,von|d hr lait s!.,s:.-, ,„.,. ,|;,v at ;..o.st. an,i smvlv lu- w,,ul,l n.,t inaisc a mrlt ry.ry ,|a>- tor that am,:unt, A l,i-m<,nthl\- rlran-up wouhl •'""""" '" ''"t ^-^' "iH.h is not an unusuai' rUan-up c-vrn m "ur Cahtoi-nia mills. A ,yani,lr plant, if pn,M,.i'lv ,K'si-nr,l. tail 1„ n.i.iLdil>- (Laii..,! uj. rxerx- i.n ,lavs with,)ut an\- -ivat inr,mv, nirn.v: to !,<■ foll,,w..,: l,y a .-mpk-lr rlran-up, sav ,.n.r a month. ] must a>,'ivr with .Mr. limit n-anlim; t he piartKahilitv ol .i-iishmi.; df\- t,, anv rc(|uire,| tinnrss, as instaiur,] in < eniein mills, l.iit that is not nc-eL'Ssary. It is my l.elief that the time will HI If 81 /\7-.( l,\ I i Y \\ !/)/■: /'h\\( 1 1( /, siicpii iiniic u h 111 ncaih- '\\rvv lu'w minlcm mill > ipcr.iiitv^ \\\< ■n ;i lni,-i(;il iM.is" un tlir .li-siris will !„• ^i i r. .list III. I .■( 1 that vnishiii '" '" '"■ "' "loll "ill 1.1 ilnui- .ir\ l.\ Lrrakn-s an.l r..lU , ,i- l.all- iiiill-, an.l the uh..|< pnnhut will tlun U' mixr.j with r\aiii.ic sohili.in c.f a sirrii-tli suKi, iriit t.. ..1 tain tlir lii'^lust (xtr an.l pa>sr,| thr.iui;h t ul .c-inills ..r s..iiic ..tluT .'csi.c [,, rcl t'. a tincnrss ..t HKIiiush; that tlH-pni.kut will all I (.11.111 IKf ..■ a-.Iatnl t..,L,'(tlur an.l passcl \,, lilti r ptvssi < so cdnstnutr.l a^ {<> iHrmit .it aiit.iniatir (lisihari,Mni,' TIh' ..l,j( I ti.in td.hist, I think. will I. )Vfi\i)mc a^ It is 111 th rcnirnt mills ■.! i-;iir..|..', wlurr tin- laws nniprl the install, <'i I'xhanst-fans ami .hist-r.ill; itimi ■tiir> In a iilani mu h rmiylily (nuliiicl. tin- .lu^t luul.l I >l' cilUCXT. .>■ pipis iiiiiiuTtr. with an cxhaiist-tan t.i a li..p,.rr. w lurr a sprav <,f . yani.lr M.lution wnnl.l r..lK, t an.l cavry it tn \w niixc.l with the tlll.i-mill it...! Siu h an arran,t.;fnu'nt w..-' 1 he ctfi I'lMihut m.l lirnt, ami thr r. .st i.| inslalli iipfraiiiiL; wnil AlKlll tnlH "K thr ciiarso tjol.l i ur p..int whirh I think is in- 40 mesh has loni,' hcM its i.l that plate 111 the tirst rank, an.l f( purpose can har.lly l.e replace. 1 Hut it> success 1 n th ////■- //\7-,.l/.U/,\/ ,-/• !)h.>/:/ hav.- Invn piTM-mcl \Vr iiM L.n-.v uaiit a :;ilnr Id nu-li pn mIu. I . l,ut a IIM)-.n,->h T!i.r,tM,v 1,., u^ a.l.,,,t ilu. ,na. liin.s l,rst .int. ,l to tlU'Sr III \\ roililitioiis ();iklan.l, AulmisI I, l.iM nil I. M K il < ■^'.\.\ll)|•: .\(iTi-:s li^ I-; \ II ■|^^-. \Vi kn..Al,.,l^,.,„ ,l„. ,,, _,„,, „„„„„,., ^,,,,,. _^ , ,.rtannr,-,-.tn,r„t '"•'>' '"■ ^"-••-'>'l at ..nr .arni. I (a, I al ai,..iluT. „, ta, I ihr "■'•"""■"' -'"— I'll "illi -Mv I .ni .„„■ \r^r\ ,,t a „„,„■ ,„av ''"' "'"' ""■ '"■'■ "■'"" aiL.thrr Irvvl,,! tl„. sanir „„„,. (■,,„.,: '|llrntl\-, I.. !„. sii..,'>stul. Ihr rxani.l.T must !»■ CN.T alert AtL.tluT tlini- li. nuisi I,,,,,- ,„ „„,„l. an. I that is n.-v,T t,, ■?!""■ """'• I — l'>l'li- I .aii I., uuu.l a |,rrsn„al .xiktu',,, v '■ uriv irratiilv null lair s,„ , ... „ ivtra, (..rv 1,„ ,,,• ,,„l,n- "I liiL,'li \alur. ail. I 1m, ails,, ij,,. „,,!1 taiim- \\as a httlr |,.,.,r,T than "'•'" "'""' ""• '.^■•'111. !,■ plant, u,- ran all ..| ,i .l,,uii tlir arn.v., as 1,.,,,^ w.,rthl..ss ,., „, F,,,, ,,ars lat.-r. at tl,.. sanir plant 1 tivatr.lat a pr..lit. tailing' . arrMii^. I.m .„u hall thr x alurs , .f , hat "1"< li fan iiit.> wasp- n\-c va^ars l„-i",>r,. Wr all r,v.,.^ni.,. that ,,x,.iati,,n ..| tlir cliaixv .lufin.^ trratni.nt 1^ .l.siral.lr 111 s,.,nnn'^ l,i^-h rxt ."a. tP m , Init. s,, tar. n.. ,v.,n..niral '""'""' "' "''laitun.^ this ,..n.!iti.,n has 1„.,.„ ,l,.\is,.,l [ r.'Irr t., tlu' Ira.hm- .,t^ ..nlmarv san-l diar^.^s, |,,r ,!„■ au'itat.-.j .har-rs "' ^'""•' •"■'■ '■^■•"l''>- ■■M'li/-1 It is ..',-n,-rallv r,,n,,.:K..l that in a vat .iKii-r.l with san.i. wh.-n .Irani,,], th,- .•ha,-r is all,-,f.| l,v '!"■ "■^■^■-'" "' ""■ atiiKisplurr p, a .Irpth .,t l.ut a |.,.,t ,.r t w, , l,rl.,u- "''' ^'"-'a"' iM-.-tii rxi.rrinirnts an.l a. n.j.ntal .lis. ,,v ,.rirs | •"" '•■'! '" Urlu-vv that s,uh >hai-rs arr atlr.tf.l t... ""■ l'"tt..n,; liiii, !„ 1,,.^ !lu' unly ('Ss,.ntial I 'ail I., mill.! a small plant trralnm tvm sdll p, | oiio p,,,, '"■'■'""""'•" '"'"s an :.1.| plant .vtn.„l,.l,.l Thmiatrrial tivatr.l was a tailm- tr..in a s,amp mill. r. .iisistim^ n( at Irast -'.V ,lav sImu..an,l.atlHst,.,nh SO', . ■ miI.IIu ,-xt, a.t, ,1 tn m, it , Itsh.,,,'],! iK.Nr iMTn an-aiiL;.'.! t.. s,.paratr thr^linu- m-mtli.. saii.l m ..nlrr 1" "■'■at rarh srp.aratrlv. an.l tin. w,uM h.avr l.^rn .L.nr cv.,n.,mi- V'">'' ''^"- ^'^ "''■ I''^"" ^^''-^ "-"i-kiii- tn ^ 1 a.lvanta-r it was '''■^■'"'■'' '"'^' "■ '"'''<'' "" ''lam^r Thr irc.it,n..nt wa. .Irsi.nu.i tn ,h.,har-,- .,n,. xat .alM.ut :i(it.,ns, per .lav. an.l a. thrrr worr t^-n vats, ra.h vat was ^ivn a l,.n .lavs' tiTatnu-nt. alth.m.'h M' ncarl\- t. ''"' '■"«'"-■'■'■ '"M '"' , H, nirnin- m\ , r thr |.h,nt that lull rxi,a> ti.Mi was i,K.,lr m s.v,„ ,|,,v. Attrra „,..ntli ■.;• t «-. s,,,,,,- .x,,,, ,„H.ms \v;e al|..«eil n. .jram I r> Strong; s..liiti..ii . liar-e.) In. in .,li..\e, nniil \ ,,t till,.! « lun v..Ke was ,,p,.,„.,|, an.! wlu n thr , .eapm- ..'.Inn.in ""■•'till, d.l' , , u.ak ,..|iiii.iii uas run .in M\ h..nrs | ''"" l';l'. I'l'luiK an,! ilrainm- at same 11111,- ]■ ■ ' 1..1 .Iram tu., h..urs, « lu-n s.ven i.,ns tr.sl, uater u>r,- run ..n lr..ni t..p ami eliarj;.- I. i .Irani is HI. Sample an.l .lisi liari^'e tailm.. . s h. I I IS •r..iai l-'d h..urs This treatment t,.a\e us ^n.n.l results in fi\e .la\s. .lurin.^' full eharije ixperiments, when we ha.l extra vats; hut when all lh,^ats wei-e put int.. entninissi.,n as alr.'a.ly state.l. the extraction .lr<,ppe,i as iiiueh as eiijht per cent. in -..m- .iver th.' tnann, nt step l.v st>p. evervthin- eheeU'.l up t.i the ninth step. It was toun.l that while our s, lu me ealle.l I'"- liu' ireatnunt m.li.at^ .|. when we ha.l \a!s to spare, t hi' t,.,vs let the ehat-e .Irani o.xi.hze, m taet., u,. t,, withm the H h.iurs neeessan t.. fill the water-wash an.l .Iran, .lr\ en..u-h i<, .lisehar-e. the vats reniainin.- .|rv al„nit tour .lavs hetore the water-wa'^sh ill ^' ri. 1 mi, , 1% ^ • 1 I . ' ' i| ^ t -»._ -»-^.»^. ',!.- '« "^ MICROCOPY RESOLUTION TEST CHART ANSI ond ISO TEST CHART No 2 '•25 III 1.4 i 1.6 ^ A PPLIED IIVMGE Inc r^^ ."lestef, Se* rcrtt U609 u'!>A -= ■ 6) +82 - 0300 - Phone ^= 6) 2S6 - S9B9 - Fa* S,S A7-( i-.xr ( )-.\\ii)i-: i'/.,luli..n th, ,liss,,l\v.l iiH'ial-. still m tlu- taihiu Attn- ihis •\\~.cn\vrv. tin- trrattmnt was ii,..(1i(i,m1. a- tnll,ju>: III 1. < lur;.'!' \-.it> uitli m.ilfr..|i LV I h.iryi' sir. .,,->., lull..,, (O.L" , tn .,„ I.rl. .u at ..ii.-luili' \aK c iMpai'ity, anil U i -. ..ik . | j ■i. Discliari;,. si.lmi,.,!. valve unlr ,,|„.ii. ami at .11, 1 ,.| mv..,i,1 h'iur, Itc'il i.iti t,,,,, u^.ak s..huinn ((».!', 1 \al\r Ir.li I. I.rt i-|iari;f ilram, \alw ui.lr irj,, n 1 "> ■>- I l.arL;!- siri.ii;: s.iluii,,n Ipmii |.i|i, and Ifi -,,,ak p, ''■ "■-' ii'TLT, \al\v u„l,. ,,,„„, an, I at ,n.l ..f .,Tnn,l l„,ur _ '■ i'"-,!;'' ("" t.i,,, ui.ak -,. lull.. n. xaKr hall ., inn l-' lai .liar-i' .irain 1^ "'• lli'TUv uiak s.,luti..n tV..in t..].. valvr ui.lr ..pen. an.l U- I'. I.il iliari^r .iram ami . .\ii|i/:f ll>. ilLirun irrsh ".atrr In. in 1..,,, until vat tills, an, 11,.! s.,ak N. M,„.„ \al\r ui.lc. kmn.;.; > liap^T ,lraii!. tins uash .u.ur^ {■ , -l..raL;c-\ at l.ailimj f. /tnr-l...\cs '~ " 1 ■; I-'. Sam;.].- an.l ,|i.,har-rtailin,- y] T..tal , li tiJ I Ml Ii..urs This ttvatnirnt -aw -..,.,1 ii,,n,ial ivsults ; ami. as a chai-r was run tlir,.u.-h m ;!, .lavs. ,t Mill -avr us a L.lal ..I 1.. -,()() t..n, prr ni.inlti. insira.l ..t j.iiiiii ,,„,-, utnlcr |,,rmrr trratiiunit. 1 tirnilx- l.rlu-w i,,,w that n.xi.lati.m takes ,,1;kv >lrar in tl„. !"'tl.iiu .,1 a \at lull ..I sainl. il„. vat h,-i\iti- Lcm lilKal with watvr ami this thcti allMu.^l t., .lra,ii ntl, t'r,.tii tlir ImHi,,,!, W]k„ ml] of water, the intvrstiv, s are .Kvupir.! l.v the water, the saml srttlni.u att.l ,,aekitl,L; a, . |,„e as ,,,,ss,l,le .\s the uater .Irams ,,11. these mtersttees eniptv ati,l f,,rtn a xa.tiuiii. wl,u li iiaturallv tills with air: the pr, s-uiv ..t' this Leu,.^ ample t., till the h.uvr x-,,i,is. as the water iv.e,les ()„ee the iilterstie, < a IV fille.l with tnr, the ehemieal ivaein.tis that tak,- plaee ,aus,. a pra.liral .exnlatmn '""'■' '"■'Millie l.e .•.l|,.w, ,1. ami 1! Is pp ,1 ,al ,le t hat Ml', ,,|-tliis rea..Ii,,n takes pla.e witliin till In.urs Thtit the int,n-sti,.vs ,„ the ehai-e ,1,, tm with air is pn,ve,l l,v the fa. t that ,n runtitn^- wtiter ,,n t,, a eiiar.^e. mm i, e'.ulltti.in tak.- pkiee. ami !ur half an li,,ur , ,r tm.iv atmr the ehai-e is .,.ve,v,l with water: inanv air-h,iles l,,riiiin- all .,\er the t.ip ,.|" the , har.^v. cv.iA //>/•; .\(»7/,>_ ,S9 An'illiiT ]irM.,f that i hi iiiical ft-aitiun takrs jilair m a ch lI'L'f tftati.l a- mtlii.. 1, ati'I thru lift I" '1 faiii t lifi (■ or t, lur (!a\ i> itfMiii tii\- (jwn n-st>: that if a watcr-ua^h he run thfdu,!^!! iiiiiiic- ihattlw It will shuw hut a few iriits p.-r tmi: wluTcas, if t lir wati f- wa^li l.c' run thruu-h m \i ral (la\> after tlir iliaru,'c lia> hci-ii allnwvd I<^ < Irani. It will rarr\- fr'iin "--i."!) Ut Si. [icr ton -rwfal yiars aL^n I ilixiArrcl that nr\'.l\ turiu'.l zinc, if a> 111 irssar\' for tlir shaxiii;,'^ whrrr ^ton'^l wcrr cxiuisril tu air. w prrlcrt ]in iipitatinn. Later. I haw K ariiiMi t hat sulutn jus runnint; thi-'iUi;li (Ik- /.iih--Ih..\. s .-.hduM nut liv fio stn>ni,r ,„ ,saiii.lr. if a prnduit hiLjli in the prcnous tiiflak l.r .IrMrrd. Whrn t hr s..Iu- timiv run (i. I', or .ixcr. the rcai tiun --ct up i,-~ .-^u \ii)l(nt, that a lai-.u'' r ].n.pMrtiun .if nuv i> .Kst rn\ nl iM\i,li/c(i than is ncrrssarx-. thr rivuhmL,' slitiie launi^'winnli' i Ikiiil; 1ii\\ m i^'nM and sil\Tr and hi'.^li m ziiu-. With wi ak solutions the ri anion i> iioi-inal, ainl iiKtallir zmr IS ill stro\-.Ml in prop(,rtion to the \aluis in the .solution, ami the nsiiltant slinir is hi'^h-u'railc. I hax'i' sin-urcd slinu' runnini; SUd.OiM) p, r ton and In-h in zinr. rciiuiriiiL; acid trcattiu nt ; wln-rras, the next tiiotilh. on the saiiic L,'railr of ore shnic. low in .vine, ri'iiuirm- no arid trcatnicnt, and carrvniL; s.*,7.(lliu i^r,,],i p,.,- ton. was nl, tamed. snnpl\- 1,\- not allowiipi,' t hr solutions to ^-ct licvond a certain st rtn.Ljt h, sa\- lid.',' , . I'or this n^ason, nn- practice has '"■'■". "f late \cars. to run all solutions ami water-washes into a conmioii \at. theniised solutions from which are run to the zmed.oxis When the soluijoii is alioee (l.ll.V , in i\anide it can he run tlirou,i,di the zinc hoxes a little slower; and when l.elow- I'""'.. a little fa.-ter. to ohtain the normal results. Should t he solutinii he \-er\- low ni cxanide. sa\- O.lll' , . and \et ru'li m nu tal-. a little c\-anide can he added to the head Imjx in each row, if it IS t'ound tliat s.jlutions of (I. op, sti-enL,'th ilo not precipitate nor- niallw In the elean-up it is '^'ood practice to return all zme. sta'citiL; on a 4(l-inesh screen, to the |ireeipitatin;_;dioxes Tins zinc should hi- kept co\ered with a wi ak lxC\ solution until returned to the boxes. This pfexents the violent oxidation that sets in umler exposun to ilir at niosplirre. m (■"I'I'HH AW) CVAXIDK SOLUTroXS ^<-l''cm''t r I noil . Thr l-MitMi-: , ^"' ' "'" •■" '"^- ^^■^"■- ''^"'^ '■■"'>• n.Musa.an,, |um ha.i a ^■"^■': "-n. n,v ..van„l. man. uh,, |, savs wr a.v .,,,„,". ^ tearful ■'" "'>"I'l--'nih.;;,n.-l„,x.s. \V,11 v, ,u m.„1 ,„., ,n ,m ad.hv.. ^" "H- m,n.,anv,h,n^,I,a, ha>l,.,.„ pnnt. .. nMau. „n , h,s suh- lr<1. t..ra!l I knnu- .■.,.„,. vrrv nu a^r,. ,,„ ,l,r niattn- The piTscilcc (if (() R 1^ S. -■ -van..!, wla-n ,lu.va,v, rah. ll,v. la. .van,,!., ,,■,...-..,, M:>..,allv "■''"" '' '"■'■"'■^ ■" ">'■ ""■". nf ,.arl„,natc., .a>h p,,un,l „t '-PI'rr ,l,sM,lvr,i r„n,l„nn,,u wul, ah.un f.ur ,„,nn,l> ,,f p,„a.Mun, ™'" , -V'"'-""'- "-""''l^' - '">., .n,lu. ,,n.n,,„a„nnl,vnu.an. -■t /.nu-.havn,,^, nwin.M,, thr hn.lrn.A- nf i h. .,,,,,..• \,, tnrni ••' '"•'" "■'■•^'""' '■"•■'tin,' n„ ,lH. snrla.x. of ih.. sl,a^ „v- u h.n thr rvan,.!.. ...luMuns usr.l a,v omiparal uv! v m ak. \V,th simn-c r M.lut.ons 1..SS .„,,,„.,- ,s ,MVr,,Mlat,.,l, an,l , h.n ni a n„„v I,.,,.,. ;;;,.l spnn.rv |,,nn, uh,.-, ,l„.s n.„ p.vv.m M.. ,i,.p,,s„,„„ ,,,,„,,, ,,., \,\ ""; '■•^I"''-""<'"s "t V„n ()..,, ,„,,.n ,/„„.„„/ n,.„, ,v Mrt. S.K. S.utl, Atn.a. IVl... \sw. an,l /'nucoin^s V,,! |I ,„, ■■■■■■' ■"*>'■ an.l .,f (•h.-i.tv .7V„„.v„./,„;„ A. I. M. H S, p, is'll show ,l,at ,i„. ,l,m,-MUv „f p,,u.n.,al !„,w>.n z,n.' an,] ./.pp, V ,J ^.vatrs, ,n v..,-v w.^ak s.,lut„.ns ,.f KC\. 1,.,,„„,„„ ,,,,, ^,„^^„ „, Mn.,, s,.lut,,,„.. Tl„. ,. I„.,n,.l„ „u, ,n a .rapl,,.- ,nanm.-,„ U M,a,w..„l ,/■„„....,/,„,. i;^l, C„nv,n„„n C-aI,f.„-n,a .M,n.,V .W,an,.n, pp 2<.!.. 21,.. M,x,x.; ,,„ s,-,KXT,n,- I'kks, Ap,Hl '''■'';'^''^'"' '^'- '''•'"'-'-"■•'-' 'm,.!,,,,. ,,v,, ft!,.. n,pp,,.p J,,, 7'-^;"'""" 'i""-" ''■'"" ^vrak ,l,an f,-„n, stn.n^.,- s, ,]„„„„. Sr. alM, Mn.wnr i.M,n,x,; ax,. Sc, km,! ,.• |'r,,ss, |an •>4 I'lns .^V"""'"' " "'" '"'" '" ^' '" "'^'^ ^""n.U'.M- solutions .„■ „, ,,i,l rvan,.l.. l„.to,v p,v. ,,,„aMnL;, or t., sul,s,„uu. sonir ..,h,.,- ,m.,ho,l "' »'""'•"""■'" '"■'" P'v.ip„at,on. w,ll .l..p,n,l on a nun,l...- .,f ,„- '■"7::^;"^'-~- ''"'"^•^'''-"--"■vjul.anan.lsn.a,-, rC-van„l,n.(;o|,i an.lS,hv,-()n...-p. 2,1!., Tlu. .l,pp,n^ , ,f „nc-shav,„, ,n a :oh,„on (<'/'/'A7v' .l.\/^ ( )\\.\n>l-: >nLl Tfoxs, !tl of lia'i. iialrnlcd h\ Mai Arthur, ua^ mlcndcil to (Afnunir the ilitti(ult\' lau-inl li\- r(ip]icr in t lir zmc-liux, AllutlitT ])ati'i,.(l |iiiiits> I Porter's' IS said to lie iisnl at illi' Ha.Ljdad-Cliasi' ii-..,u'. the ;.;old hfiiiL; iiri'dpit alcd liv zinr sliaviiiL,' and tlir copper aftrr- uanl ivtiKiM d li\ iirol( J!i'_:cd t rratiiicnt with ziiu-dust and ammonia. This \\;,s disrnhid in the MiMxc, .\vi) Sc ihXTiiic 1'ri;^s of .Ma\- 211. l<,i(i.-,. KuiTuk. ■slJ-,1 m rV.WIDK I'RACTICK WITH Till- MooRF i-ilti:r I H^ R. Ihi.ma.n Hk.!\v.n 'Sf].lemKiT 1 , I'.Oh) The plant. ..( wbuii the lol'- .wm- ,^ ;, ,], ^, civrtiMl. aii.l l,n.u-l,i iM sali-,tart.,i-\- nplhin. \\-a- ■k-i-iu d, ,,,,,, - ,, , . , '■-■ "'" '■'"'"" 'I'l'-nii; ihr Nvars '•"!^ ■■ •^'"'■'' '" "■'' '■-■''■" '■'■ "H ,„vl,n,„,arv „n.M, ...„-,„ an,. >n„Mru.,H.n t, il naUTallv up,,,, ,1,.. .I„,ul,l. ,-, Z,, m,. t1„,„1,„-, •'■ """^"■■;»!-nnt.„,l.,„ .„ ,1,, ,.,„„pa,.v. „„■ wl„n, ,lu- -vnt.,- "''^ ^'■"''';'' '"^'■•^'^"■^ I'nnn;, ,1;. p,-,,.,,... ,,f ,i„, ,,,,,^ ,. |^,^,„. '"•''^ '" :'^"^'- '■■^l-nmrntal an,l p,-a.t,ral, was r,,ll...„,i ,vl„H, !'":'"■''''' ;'V'''''''^'""^'''''''''''^''''^'"''lH.l,lisi, ,„..,, llal,,,,-a,,.,,, "'";""f'"^"""»'^^'" '-■-—■"-. Tl„.pap..,-an,i,l,-aw- ni«si,au.l„...np,vpan,l.la,-^,lv, ,■.„„,„,„„,,,.,,,,. u„ I, , 1... vah,- al.lras.,s.an,v-,. ,1,.. pnval.. „„t.s,„ M,.. H II Xu, ,..,■, wh. , „■,„„ Hsp.,s,,,.,,, as „,...,,a,,,,,, ,„,,,,,., ,,,,, ,„,,,,,„,„,„„,,,„ „„. ;,^:;^'^""'^"-''*"-''-""-">'i'v,n„,u.i, u„l, ,lH, ,,,„„ ,■,,„„,,„. '-■"■'■ ■'""''■ ""' "i-tallal,,,,:, ,n tl,,. ,,,,-lv- ■!,(,. , ,,- .|„. ,,,.^^ c'van,,!.. plan, a, ,!„■ S,an,lanl nnn., a, M,„l,... Cal,,,,,,,,, un,l,.r till- in,t,ai,\v .,f Mi- ThiK II I ,. ,1 . "■ '""v II- I.. ,L;,L;rU,th,. iivalnirnt ,,( ,!„■ sl,nu' has l,.vn a p,-..l,K.,„ .„„.„,-,„. „„,„,,„„,, Th. ..a,-l,..s, p,-a..„c.ai i' '7';; '''r'?' ;•-:■'''''«■•'--■'-'■ an. .■as,.,n:,,aL.,v:;:I ;7;,''''' '■•''^'■'; ^'''"'\'-"> 'l-pon-ls w,,l, a.l,s.-l,a,T.,.v a,,.l ,,,,x •— „san,l Apan >n.,n M,. c.s, , ul„.l, .,.„,.,„ an a,i,l,„„„al '"■ """■" '"'■ '"" '■" ""' "''■-''■ '""na.v, ,nrh„l,n, M,r ,an,l ,'■ rT '"""■'''' "'" ""'" ^^'""■"■'" '"'■ "''■ 'l'l"""n .,f a p,„-,„,„ ;;'"■:""■•"■•"'"'■'■ '^'-'-•i--.l.-"l-,.l t'mnatal,],. si,,,,., Mn, ,,,,„, ,,,,,.,. nif„,s uvi-r n,a,lr ,„ ,,thr,- .. ,,f the '"'.',""" '''araru.,- ,,f ,nu.l, ,,f ,hr sl,n„.. ,l,a, w,,„l,! „.„ .,,,,,,, '" .Lhr. ,„„v..,- I.V, solnis. F,l,.,-p,x ss,n,. was , ,-„.,i an,l ahan- ////■ MiU>NI: hILII-.K I. 0.5 ddiU'il. hccaiiM' an tiL;litli (jf an ini Ii nf \,\\vv >Iinic wnuM make the L-lotlis ini|)fr\ inus, (\f!i under 120-11.. privvurc; and < \ i ii if tin- slum- was mixed willi tine ^and. the tilternii; was su slnw that thi' sand settled nut in the clianiljers, with the same fesult. Delndraticin nt di-\- ^lime l.\- foastinL.' made hnth tiltefini; and deeantaticn pMssil.le, hut with Inwef extraition and hiL;h enst; moncjxef. It was not appheahle lo t hi- ilifeet tfeattiieilt of the wet proihut ffoiii a stamp-inilh More than otie method of tihraiion m \ats during,' aL,'itatioti was tried and disearded. In the -unimer of \W\\ the first erude tests with the Moore method ut t'e made, witl) no hnlliant results. Later a pi'rsonal in\-esti^ration of the plant at Mefeur made clear the iiiheri nt ad\anta,ues of I he nu t hod, while at the same time it exposed eertain nieehanieal detieieniii s. An exiierimental plant of half a ton eapaeilx was installed at Hodie and from the hrst the res\ilts wife ,L;o(jd. Sueh was (jur sueet ss that li\- the middle of the winter we deeided to appl\- it lo all the tailing frcjiii the Standard mill. In di sis^'iiiiiL; the jilant e\-er\- care was taken to a\oid the det'eets of the Mefeur plant, hut not- witlistandmt;- this, several months were eonsunied, afti r the plant was nominallx' eoinpleted, in alti-ration and niodifieation. the maior part . let it he noted, heini,' in ditails outside of the Mooi-e pro^iss pro])er. Bv the midille of UMI.') operations had lu'eotne fairl\' ri\L;\ilar arid the profit fortlie whole \ear amounteii to more than half the eost of the plant. The ore eons. sts of (|uartz. iron oxidis.and ela\ , llie last eom- in;,' from the deiom]iosition of fehlspar in the eountr\' rmk. At times this eijuals ."(I', of tln' ore ami as an a\-era,L;e ean l.e takiii at .'{.'{'j' I ■ 'rill' .LTold is part ]>■ eoarse and part 1\- \'ery tine, till- latter portion atnal,i,'ainatiin4 l.adl\ . to sueh an extent that at an\- time tine eolors can l.i' panned from lulou the \anners. The propor- tion of sil\-er is hi.uh. the mill l.ullion l.eini; worth onl\- S^Kl to ,'*1L' j.er ounce. Altotjet her it is a ditfieult ore to treat , desjiite t he t(.tal al.sence of all miiU'rals ordinarily classed as deleterious. In conjunction with the introduction of tin Moore tni'thoij weak cyanide solution was suhstituted for water in the 2ll-stamyi mill and the .i;raiie uf the platis was incrcas"d from \\ to 2\ in, per foot, in order to cut down t hi' ]iro])ortion of liipiid to keep the platesclcar. This steep ,t;rade, in conjunction with the hardening' etf'ect of the c\'anid,c solution on amalgam, has liiniinish.ed the lil 94 KI-'A h.\T ( V \ \ //>/■: /•/,■ \, II, [.■ '■xtra. li.m \,\ trri' inillm- imni liu i,, "(r , .Vn,.,- r, ,ns,,l,..-|l,l,. rxprnnunt ihr Mniv^th .,t rv,,n,.lr s,,lutiMn w..-, ., tilr.l at'nv,', I-""'N !-r l.m, an.l u,ih ll„. at lirM „,, imuM.. ua. rxiM.nm.v.i "■"'\"'^' '''^'"-- '■•" ■" l^">' "'<■ I'-,.,- „n,.s, ulHT,. ,h.. amal.an, li- tlnnn.s,, Ikuv ,1„,u„ s„m,s nf ua.Un,. an,l ..„,„. l,a^v N-n '">■";■ ^^■'■' I ■ ''"-'I'lv 'In. ,an !„■ l,..,.,,,,! l,v umh, M„n,. „,.,al or l.v.an-v,n^ a hravur n.atin^ m an.al^an, |.„,„., al , l,r rat.. ';' '""' I'"'- "■"■-"l'l-l'"-lH'u,v l„.,.„v, t ,..,..,„, l,,..,-,,-,!,,.,- , ",'■ 1"^^'"- "^'■'- ^■'""i'''-v Ihr ,,ul,, ,. ra.M.l .;;{ ft, .,, ,1„. h,„i,. Ipvl tint.,,, tor r,.u..v.anr,. ,,, , h, .l,,,,,..,,].,,,, . |,s(,(. „ ;„,^,,. ""• .-Irvafun ,. ,l,,n,. l,v t.-ur Vnun-v .an-l-pu,,,,,.. ,n smr. TW- ''"V.. I,,uvr,,n..>, l(ll,v rA ,„ . l,av,. a !,tl m Mi,, , ,„ ,,.,,, ,,,^. '•PI-'-'"". ,. Sl,^ )s,n , „„i ,„^^. |,„ ,„ ,^ „ .,.,_^ j__^|^ I'^^^j tiutiu. ,s ,,,„, „u.|u.. u-,,1,. an,l niiir ni.h. . ,1,.,.,,, s,., ,.„ ;, „,,,,,, "' ■■' '". !"■'■ " . 'iH. ,-,1,1,, .atTu.s 17 ,,, nr, „,,„,, ^„„| ,,;,,,_^ ''^''■'". ■ " """"^ "''■'■'^" "'"''■'• ■'" >-i>'iiti..n- nt tr,„|„.ratun. A :,rra.l,. '" ' '■■ '"■ "''^ '""""' niMithn.nt, par, uiilarh- ui ,.,,1^1 w, a^hrr ^'"'"^"''■'■ ;;'">'■ "-^^ ^'1- t'.tm.l t,,^n,. ,nm!,K. hv a.vutnulat,.,n.. "'/■'"''■ ^^'"■" ■■'■'"v-l at tlu. >lin„-,,lant, ,h.. pulp ,s a..a,n '■"""' ''' '' >''"'"'uy.-.l-I'titiip tn tlu. >...,!. ...pat-atnr. \ „•,,,,! ;:'--"-'''"^;'"'i^v.M,u.,h,„l.,„ han.lltn^pulp Th,. Ff. „,..,• putnp '-■a ,>.^ular ,l,,w a„,l ...r l,f, . w,t l„„ „. ...pan, v, ,s „,„.t sa„'- ''"""'^■; ""' ■■■"i^i"„p,„,„ ,„ p.nvrr ,. „,,nnnal an,l ih,. uvar i. -""""'■1 '■'tlu.>tutnn,-I.,xa, tin. , I,., hat-,.: I,..w..vc.r, „ r..,|u„vs "'";■'■ ''"'■"'""1 "1 "IH.fatL.n. partirulat-lv ,n staftni- ,„■ .t..p,„n.. aii'l a -nat .Ira! n\ panis m rn^ini-^ Thr .v-^r:„,hn^ ,. ,|,,„.. ,„ ,, }., ,,, .o ,-, ,,.^„„,„,,, ,„l,,_„„i, -'t.\II,.-(ha,t„..,-. n,ak... Tlu. ...,.,i ,. ,V,„n th.. un,K.f-(l,nv ,., , w„ V'"'-^"' '■"•'""■'-■ ''"'•"-■ ^"■'' '"■ "■ l.app.-<.x,n,a,..lv fnv f...., ''••■'■,;""' ">"' •"• -■!- nt .„U.. X„ ,.„,, .„,„„„„ ,^ ,„,.,, "" ""'■'' ""■ -■!"'"-at>n„. ,|u. ,1..,.,... .„• u|„>.l,. ,l,a, ,< „, sav tlu. I"-l;;'n..m u, ,,v..f.l.,w ,,, u„,k.,-t]nw. ],,.,„. a.,ulat..,l l,v a .ittipl. ;;:,'""''"^'^''^'' '-'"^"-l l.v a sr,v«- an.i „an.l-u h,..! ,n„n ,!„. ,',,, ""■ '-""nttr t..., „„■ s,.pafat,un ,. f, .atdt tlu. nv^rtlnw ,,„ •, ■ -,, """'; '^■'■^''" ^'"'' ™-' ""■ "-.,ll,.-vahv until no ntatrnal r, lu M "" 'l^-' s..tx..n Tin. un,k.,ll,,w. n,nla.n„„. ,1,,. ..oafs.. Mnft an,l a '■'■'•'^'"M"-..pn,-„.,n,4a,|lu.n„,.l„„, ,„ss... to tlu. tnl„.-nt,Il l„.in„ ""x..,l wnh ..„,! a„,Ul„n.. fn.nt tlu. p„„,K. aut.mtattcallv f,',l tntu llll' Stl-raill, Tll(. nut III. Thr iinll niakt.s ■_'(; r,.\ w tiniii tlu. null ,> f,.tufn(..l t.. the ...nu.-^ !"■'■ """■ ■'"''>' I"'l'l.Ks aiT (uT.nlan.i 7 ///■•. MooKI: hll.ll.K I •»." ]t (■c>iurrtii.nar\- tliiit-^. the ilia,-;^r \iaiuc al.cAi the iiudillr This iharL;r M'ctns I" ' !■ thr 1 r-.i |(.r L;nn.hii'4 atiil Tin.st ( . . nmjiaral uf pnwri-, i.ut the ihtlcri ncf IS IK, I '^n at and the chariot- ran \\< ar ti> lia'f this .|uan- ti!\- with siiiaH ihiininniMii uf LjniKhiiL; Thr atiniipt was i arlv iiiadr ti> Use srKit.d pthLh-s frniii h.ral -ki' lal Unit, hut t hiir irrcLtiilant \- prcxc iitcd t"n ( tnntn.ii. aiii! ;;a\r a hi,;,'h w ( ar i it hiuTS, with inert asfil iimwii i unsuniplinn. Thr iiistit'tiricnt h.ar.hirss also lit t Ilr ] If hi ill s iiiailr I hem i-\jjensi\r 1 hf litiini,'s (iriL;inali\- t urn is] km i wcrr nt' w hitr last ii'i m. sri-urnl m yhiiv iinlv hy the .inh i>\ the shdh Th(\' wcit a MUistant SdUiXT lit ti-(nihlr frctii .h-iiiijiini,'. ami tluii- litV was shurt- S.itt- w-odii hldcks (III mil, six iiuhrs Inni;, wrrr next trinh 'I'iurr was tin .liniimitimi < it t !u- ,L;riiiiliii;^i. hut 1m'si,1,.s tln'ir shdrt lilr i >t ah"Ut 1(1 (lays thry intn mKui'iI an uiicxiiecli d rlciiifiit in I'Xc'i'Ssixi' tdaniiiiL; nt' all the sdlutinns. It w as assunu'il that this was due td a saiidnitiratidii dt the w.idd oils 1>\- the alkah m tlu' sdlutidii Hut whatever the . ause. it ii-mhieed an d\ crw helmitii,' mass d| suds, d\ ci-lldW in^i; all the launders and edXcnuL; the \ats uithi i.s m td ■_' tt d| tdani MduiMain niahdL;an\' \\as tried next, dmiinishin- this trduhle, hut with seareeK- a ;dni;er life Silex was sulise(|\iently used, and tor a time answered well, Imt .vhen [lartlv Wdi-ii there was ediitinual delay frum rejilaeiim wnrn-dut lilcieks. This dhjeetidii was entirel_\- aside trom the delav dt' fdur weeks dr mure demanded tdr the lull settins,' ol' the > eiiieiU that held the liniiit; in pkuc The enntinuatidn of the use df silex meant the addition dt' a seediid tuhe-mill, that is, the du|iliiatidn dt the re-L;rindinL4 jilant. I'inallw the iiraetiee settl.'(l ddwn t(j wrdu-ht-iniii plates tdr liners. These are • hy ,s in , cut into 7 and I.Vtt. lengths, and hdlted thrdu,i^h the shell. Sdiiie df the plates df this lininy wciuld he Wdrn thrdU'jh in !I0 davs. hut hy replaein.^ these the a\cra,s,'e lite eanie to d\er UK) days and the dut\ td 4, NIK) ; ms df sand, .yrduml td 2(1(1 mesh. The ednsumptidii of ]iehhles was l.'.t tons; redueui.i; this td pduiids per t'Jil, the liniiiL; wear was 1 A\ Ih and the -lehhle ednsumptidii ti 47 Ih It sin'ms Hkeh,' th.al th.e w,ear dt lit illv and jiehMes is rather a funetidil of time than df t iiinaue and i,i any east' it is e(,irtaiti that the rate of wear df liniu(,r at least is imu h atteited hy the manipulatidn and pnipdrtidn of solid m tile teed; sd tlial tins somewhat aiiimialdus sueeess with tlie M I I ltd A7-:( /•. A / ( r \\//>i: I'K 1, //, -t„rl„„n^,s,,p,!,,),K .n ..„..:,.„,-.■ ,1,„. ,,,, |„. „„,,,.,,,,j ,,^,|, „, "''"^""^' ""■ •'■'•'' '" ""■ ""ll It .- ... I.r n.„,.l a. a ,„„„, ,n '^'■'■'"' '" ""■ "'■'■>''^l>' 'n>n tl,a, il„.,v ,. l„tl,- uas,,, a. u can l,,- "'■'■" ''""" """ ""li""t hn-akn,.,' Am,!,. lrn,„ ,|„s thr rasr "I immtuhl; an.l s,., „nn.^ thr straps all ,„ ul,„l, .an l,,- a.,un,- ''';^"'"' '" ';.' •''■ "- '!'•■ 'iH.nnnnn, ar„„n,.U l„r ,h,.„- „„al ^"'"'"""' ""• I'""'''- '"'• ""■ niill ,s a,,,,n,x,n,at,.,l a. :,() 1, ,, "■"" '■"'■"1111- an.i 10(1 i, |, at startm- The iiiaxiimim ynn^hm; ;"''"'"^' "' ""■ ^"'^l'- """ li^'-^ '1'.' l-n ,lvhn,tHv ,va.h,.,r ,;" ;"^^^"'' "M'la.. , tat .ill tuns., t san.i p.r211„-. Tins tnak.s ""■■i>"v,,tah.„-s,.,,.,u,.r,n,.nth:;.it.,n. At n.-rntal . ,k, ,,t d,v, nr !:""'■;""'''''"'"■"" ""•I-w.r..,st .,„„,.st., 17,- ,„.,-,.,n a, tl„. ■^tan.lanl „nn., win, h ,,n,.ln...s its .,«,, ,..,u..r. th,- ,,,s, ,s .U.. An ,„t,MVs,,n, ..,,„,,,ans.,„ „„, l,,.,-.. 1,.. ,na,l,. l,.,«v.n th. o,st •" P""-'^ -.1 ^lanM.n,, fn,,,, ^r,„ .„, „, ;.,,„„.^,, ^„,,, ^_..^_,,. •'■-n;i,)-nu.sl, t,,l^,.,. Tlu., „nsu„,,,„.n. .,,„,„.,,„, ,,a.Stan,lar,| •»>"'■' l.nuU-11, Mamps,s,„,rs,a,„,„n,al„n,.,..M,,.. Th..n„.n,h- ly |'"i"^'^-''' 1^ I.M>n. - that tl,.. ,lutv ,,t ,,n.. h.„-s,.p„u,,-.,nonth » •i4 tons, 11„. ,v,ln,ti,,n ,,f hn.ar si/,., fr, ,nt .'I ,n, f, im-tmsl, '^ ^'7" '" ""■ '■^"■" -■• -•"""■ inn 1 F.,, ,r„, tt,l„.„nll ,1,, '•'"" l"!w.,-,i 1..,.,! an,l ,,P„h,. t ,s (I n_'.-, (111(11 ,„■ ■_'.-, I Suniniar ./"Is' On.. h,„M.p,.u,.r ,n tin- stantp-nnll ,v,lu....s .1) ,.,„s p.,- ,„,„„i, •" ^' '■^'"■"" I"" I- ^'I'l ." tl,rtnl..-nnll ;;(i„,ns at ■•.-,! Th.s. "^^";" ^"'•'' ""■ ^•■^'■'•'1 ■■-a-".- tar fn„„ a.vurat,.. l,ul th.^v scrv.. t- >l...u- in a skrt.hv tasl„.,n tlu' ku-.lv tn-ivas..! p.nvrr ,.,,st ','' ""•-."'■'ti'l.ii^. Ill r.,nn,vti,,n with thr nvrnt n,,trs:- ..t^ M,- '^""'■'" "" "'•■ "-'-^itv ,>r lu-avy .,.u,.lat,.,n. t.,r th,. tnl„.„nll " "^ ""-'■'■^t,n,^ t,, nn,.. that th. .,.un,lal„.n. at tl... Stan.lani •'"■,'"'■':' "f ''^'''^-^' t...ilM.rs, t,r,l an.l l„,lt,.,l p ...-.tlu.,- wuh hravv ''']f'' !'-'-"t 4 l,y s„, tlat in.n an,l .atvlnllv 1h.,M,.,1 n„ „u:.i- s.lU srt ,n hanlpan Mr Xuttrr trlk n,.. that aftrr n,.aflv a vour'. ""■■,"'""" "'■'■•■ "■^'-■'" "'ti' a tt-an.it an,! P,un,l nnnt,,vr.l ' \. a "'i'' -".nnrnt up,,n th. tul,c.-,n,ll, ,t ,.an !„. sa„l that ,t has pn,v.,l .tv.ll a hf^hlv c.ft,..,..nl .nu.-,M-,n,Hn.,' ttKuhtn.., I,u, that wh.n the "■''"''■ l;'^"" ■'•■I-'"i< >.!■".. a s,n,K. unit, as „, tins .as,., anv a..,.„l,.nt t" .' ^huts ,l,.w„ th. wh.,1,. plant TlHsvtnuallv -innan.is ,h,- ''"''''^■^""- •" ""■■ *■"'"■'■ tuiK.-nnll ,.,p„p,n..nt f,,,- a small plant a heavv ,.xtra , aptta! ,.xp,.ns.. Tins ]..,] .„ .xpvnnu.nt u„h a m."h!H-,l pan „„• hn..-^nn,ln,^. it was ,„un,l that a si„.l.. ,iv.- I""t jian ha,l a iaiia,.it\ ,,f -.l,,.,,. ti,.., , . 'IISUMIV, 1 •MlMV., VM^S, iKMini I'KHss ,\I;,^ Jli, |,)<),, ■////•. .\hXiKI: l-ll.l l:l< I !»7 10 lip, nr fri>in c ivlit f- iiiiir pati-- w ( I'c riiniirr'l tn liaiiillf t he marse [ipHliut 111 ■_'!) --t.iiiii'--, ,il .1 iiiarki'l iiiiita~c "t p'PWcrcMsi Xu ilrtcmiinal ii in wa-- luailr nl' \vi ar nl im lal lint ui'Ilmh'^' Iiniti rxpcricii, I with ;,;riiiilinL; nuii ciitratf il wnnM lir liiLili. aiiil pruli- aM\- till' lalmr nt attniiHivj ti. a hatli r\ nf pans wniM I..- lai^'c. .\ltMi,'rt lur tnr a sniall plant, ^i i |"ar as iliis i xprrirniT v^'in's. tliri-o siiialliT tulic mills, an\ Cam nt wliiih ,ii\il.l iln the wlinlr wnrk. wniiM Iir piatnalilr tn pans, anil jiHiliaMy rlaapif in installati'iil tlian twM lai'i^'f units The iHf rciii lit snliils has l.rrn iiii fcastil in thr tuln'tiiill ilisrliafi^c tn _'.")',, i.f prrliaps li:;,^'lirr. li\' till' aiMitinti nt' material ln>m the piiiuls 'I'lir scttlitiL; \at<, nt wliii h tlicrc aiT nine, ai;i,'i-f- uatr a capacitv- nt L'l.lllid .u tt . tln\ are tlat-lmttumcil u irii '.ats in twn si/ts nt 70 anil sil tnns snhuinn i apai it w rrpirsiiitiiii,' -'.■JllO ami _'".".() ,u, tt nspi ,ti\ 1 1\-. On tin- hasi^ nt mtlnw nf ^00 , n. tt ]irr liniir, the line size tills in .").") hr, ami the ntlu'i' m ti 4 hf While tilliip- the\- are aeitateil. then allnwed to s,ttle .'S hr. ami slnwly ileeanteil ilnuii tn the upjier snrtaee nfiheshnie. This neeiipies eieht hnurs aiiil twn ninre hnurs are taken tn mix ami ])unip mit the sluilye. a tntal nt almut 1:; hr, l"nrt\-t\M) per cent i\' s in. ernss-arm is sieureii in the shat't ami trnmthis the lirai^'s han- liy links ,,,■ slinrl ehains. The drag's are shnrl lengths nt' liO-lh. T rail, the speed nt si'\-en nr ei-hl r |i 111, is aiii]ile and ihe pnwer ennsumiJtmii is Inw , This dra^ t \ pe nt a,L;itatnr is (■sseiilial, as mherwise the slime paekini; amuml ihe lilades would stall the driviiiL,' i,'ear AtUr deeaiilatinil, the pulp is iiiaiK' hnnini^enenas \,y stirrini^- with the dra,L;s and then transferred to the stnra,L,'e nr tiX'atiiient \ats l.y eenirifut,'al immp <')r airdift, Imth devices liein;,; used I'nr di eimtatinn there are hiriRed I'ijies that are InwtTed inln the \at, after the recjuisite clearness is attained and that ean he kept near the surface so as to draw nt'f the least turhid solutinn. These diseharLje thriiui,di the sides ot tile \at a short distaiiee al.oM the bottom. The sludge is drawn otY tliroui,di pipes in the I.ottnm. ^- < '^ AXIDI'; I'RACTICl-; WIT i-ii.Ti:k II Till-; .M( )( )R|-; li'i l< '111 M W likMU \ iSei.tcmU'i s lid,, S., IiMl.. lias 1„...„ ,,„I,1,.|,..,, >.,„.,, „in, ,1,, M .,. pn.vss 111.- point. ,n ,,,nn.i.,„ L.tuv,,, ih,. .M,„„v .■„, I ,|„. Ca.s. 1- Hut ;.,■.,„■,„.,..,•,. TiK. t,l,,-a,,n„l„ va.uuni, u„h ,1„. ns„h,„,. adlu'sionn, .Inck.t., ,lu.„u,.„l,. ,,Mlu.nl,.r:a„,I ,1„ ..n,ral yi.'o,M,,.r,u-h,,,,all,,..a.r,a,a,va,n.,,,,,,,a.,an,l..I,,.aM..nn It sc-c.ms,„„„. ,l,a, ,i„. ,„.„,, ..I a,ll,..,„n ,„.,„„.. „,,i„ „1„ ,■ mak.nK ,..,..„,,., „. ,-,.„„„aI ,n,n, ,h,. nniainin, ,,„!,,, ,.,,„. n al '•""V ""'"•''■••"-■'■'■•-->•''-■ a,„l, ■!„.,■ .|,nu.„„.,h,„K O.lHM-s •" ''''7'^ '■^'^'- •''''■•■'■'''--''■-■'"!-- l-^.u..,l,,arall,.I ,. I,., Iv "'""■'V','""^ '""""■'■ '"•'-^"'"""^"■'^' •" t.nnnm,,,, ^.,h,„„. i.„, .,, ;''""' '^7; ''7/'''''' -'"''' ^' -'^'' '-!,,. .,u„„l,. ,„ a nh.r a„,! 't. .v,n.,va! ,v , In. ,n, an. fn.nMlH. until,,.,-, ,1 pulp ,. ,1„. ,.., „,„, '" I"-^';""'' ^" '>'^-'- Tl,,. ,..,.n,,al ,l,,y,,-,n,v 1,,„,..„ ,,,, m,,,,,/ "-"-■- "-pulp „■„,„, l,..„l„.,->l,vpu,ups ;;' '^"■'" ^"'"'"'■' ^^'l^'"u„s ua'""■•■ "'■•pl'"--.> a ;.„. ..hann,.l.„..,„ - /^/O '""i "> -I- .■"mpa,-,nu.n,s thus ,n,-,„,.,l ■ p,- , ,„ ., ,, ^, ^^,.,, „,^^.,.,^^, '" ^'' ;"■ '■"■<'"lat,-,n U-„h,n ..u-li „1„.- a i.„. v..,-,„al .u,„„n- 1"1'^'- "•""■"'■'1 a, ,]„■ ,-n.l s,, as i,, ,1„, „„,, ,h„ ,.|,.„„„,, ....... , , .. 1..1 1 I i. I — I ^. ; ^^ I I II KM) .V/-( /-.A / ( )\\//,i: /'A'.U TiLh r.n.!u. „, ,1,.. i,„„,„„ ,■,,„„ ,,„, ,,„,^„|., .,,,_^, „^,,,^^,,,, _^f ^j^_^ "^ "■"•';';""i I'v a >l,„n l,.n„h ,„ .u.M„n-l,.,.. m a tl,r,.,-uuh "'^*""" '■ ^'"■""«'' ^^■'-'' ">'■ suu.nn ,> a,,,,lu.,l. Th.. ,h.,a>l. ,.f tiii> w,,i i„, 1,,,,,,,, ,„„,^,,^, I ,,^, ,.,,,,,.„,,, ,^^ ,,.^^ .^ J ^^ ^^^^^ ""'i>^ V. nual siul, .,„-,.,,„•., /,' ,l,r n.anitul.l n, .n,i-v,fw an.i -1 ' •'"'1 /•'■ Ihr l'lrmun-|Miir> an.l nianifuM., 1„ ,]; Stan, lard Vn \ 1'';'"^ ""'■'■ ^"■*- •" '■• ""- -Pl^".-,- hu„. ,n,n, a iVanu- ,„ .,,,1 '•';^'^"\'/^^^^^- /•/•■/•■■• "'■■ 'l'>'aiHv l,.tuv.n >.nl:v-. huiiK t"ur ;''''"/ ""^'■'■"^'■'^';-'l><"l'ask,.,;a,,,,n,x,n,a„lv l(in,M„,aR. >" tli- ,u,, n, ,1,,-. n.,-.aMu,„,n-,,un,,, .C^ IJ l,v |.,n ,i,,vc.„ '"■ ^' '"■''''■ "■ <■ '"■■""• '" ■ ^vlii'l, .l.Tuv. ..s.Mrnn, ln„n thr :;;'"'■ "^'■'■'"^"'' Wuh a va.unn, .,( -,l ,„, , lu n,.,,,,,- r.msunus :^ ''''"''"'■'■""' ''"' '" tl — 'arlv pan o, ,l„ ,,,1. u!,,.,, nltmuK IS MM. thMT ,< a h.aNN nsr m ,„,u. r al ,]„. , „,1 ,,f ilu- strnkc 'lu.. iM ,x,,cll„,.^. .nlut,.,n ir.MH thr >l,n,l,.v ,I,.ara,uv .parr Tc •■'!"al./,. il„. ,1k. pu.np. hav.^ h.-avv flv-wluvN. CI, arlv ,1ns bas- ket anan^rnH.u l.n.ls ,,.,■!. ,,, ^,va, a,va ,,f „!,.,,„. .„,facc. "",'■•' '""'- '-^^"-1 't- '"">vn,,-at..,l ,n .ad, u„„ . Thr haska't .^ Inuvr i,v ,.„„■ .,,,11,.. .m,.-,.ul, p.t.h-.ha.ns ,.. ,1,.. „vv,-]„.a,1 '''^'"'•^""':^™^''''"'-i""-''--l I'va l()-h,p„„„„ru/, ,hnu,t,h,l,. !I^'''"""" '-'^'"'-l --„,..„■,„, an.l ,l,U..,-,.n,:aI ,.l,a,„-u-h.Hs Ihr .inv,,,,, ,,ull,.v „„ ,1„. ,„,.„,, „ „„|,,a„,l a, // an.l , 1„. .Inv.-n ''""•7 ^" '■ "" ">'■ ^^■■"■'" ^'1^'" ./■■ A'A" a,v ,h. u-,,n„-ul,.ds k.-v,..! """''■ ^''^'"■' "• "'^' l-l<>-t-u-Iu,.ls MM. Thrs,. w,.nn-^,.ar. ar. "^''" ^""' ''■" ""--"l^ TlK. u,„-,„sl„.a,-.,„.,.lla,-s„n th. .-n-N .,f "^' ^v,„-,„-.l,a„ an.lth,. ,l„v.„„„,., ,.„a„„„,s.uch,l,a,,ra,s,„K ">•; ■■•^"l. put> >haf, ./ ,„ ,..„.,„„. ,,, ,lK. sa,„.. ,,„„. ,1,.. ,v,,rms t'c'niK n,,hl an.i k-t,, ,h.,v ,. p,-a.-,,rall v n.,. n.p, hruM „„ , hr h.-ar- iriKS. 11,,, p,Hk,.,-wl,..,.l. a,x.,,fs,x an,l s.v.,, p.^k^.s ,vsp..„v.|v liu. .Ta„r-„„„,,r an.l piunp-,,,,,,.,,- .^r,,, ,,^„,,,„, j,, „„ ,,,. ,r.,lk.v- w,r... AA ,hn,u^l, ,|„. f,,,.^. an.i wiu.-ls , V '; P ,. , h,. „,.„la,.,l rrs, ..n„, wh,.-h ;i,.. , ,-, ,|K.v-u„v ,|n,ps, ul,,., „.„ i„,i,i „,, ,„. ,,„ ;""■''''■ ""■ '■■",.-„„„,.,■ ,. ..,„.,-a,..l ,l„.„u.I, ,lu s,a,-„n^^ ".X /. wh,..h ,-, .,,„!,-,,ll,.,l ,,,,„, ,,),. ,ank-H,H„- t,v ,1„. ...nls C ' li<' "".'1 ,nax„nu,„ l,,a,l ,,, ,1,, ,■„„ ,„^,^,,, „„ ,,,,, ^■,,.^^,^^, ^^ .^. ^^^^^^ 7'^ ""• l^'-'.sr.i ah.m, srv..„ ,..,, ,„ „v,. ,„„u„,.s Tl„sr,.,„vs.nts af">n< .i hp, 1!„. „„,;,,, o,nMi,„rs s.4 h,p, ..f ,.u,-,vi,! , .,, ,l,at the ^'S.. .u.,1 v„I, ,lu. l,alan.„,^ .„ ,1„. „-.„-,„s, ,s lu^avv, S„ll a. t h. h",s, ^ ,n .,p,.,-a„,.n „.„ al,.,v,. ,„„. 1,. ,ur p.M- .lav.' , !„s ,s n-.^li.- I'li' .\ntu,,lis,a„.lmu thr .iiCtcnnl,.-,! ,„.r,r,„,, „ m Tin- M(HUt, lar;,a'ly I'll ailsc tile Iiuckrts 111 t tlf wilt fl^ wtTiTlDt (ii'cji fii'JiiL;!, Ill- Well littfil til the chain, I'^vrii iidw when this has liri'ii ommtdiiic, L;uiilf-wht ris that \\c IT ilrvisril ti) make the chain i;n]i the [mcki'ts licltcrarc ritaiini] as a nicasiirc ut prccautnin. Pi-iihaMv' aii\ I'liliifc i!csiL,'ii shmilil ha\'c wheels with twice t he miinher iif |i(ickets. The j^'eneral ciiiist nici II III 1)1' I he i-raiie is clearl\' imhcateil \\\ hit;. ■'! anil the pin itn'^'raiihs, aiiil iKeils no • 'xplanatinii. The pi >ckt t -wheels afe placed at i|iianer-spaii ;Miintsiif the lar'.,'e I-lioains, ami all stfess calculatii Ills wiTe turafactur (if satVt v i)f (ive. The snppDi-tiiiL,' track is uf (iO-Ih. T-rail ami rests nn hea\-\- 12 li\- IN in. lun.uituilinal sills. - the ca])s (it the sujipnrt in;4 sets. Tn pre\"i nt -^ spreailine i if track, the .sets are franieil hack to j_ the niain jmsts uf tlie Imildmi;. All of this con- Z structioti could Well he of structural steel where p trans]>oriatioti cost is not jirohiliitiw. The E tra\"crsinv; de^■ic<■ fur the crane is a !;-in. plouLjh- ^ steel wire-calile, run over tliri c and four-L,n'oo\'ed shea\'es, after the manner of the Km ]ie lioist. ~ the main sheaw heint,' ilri\en li\- a W')rni-j,a'ar .v_ from the niaiiidine shaft. A nn\) on the (.ranc enL,'aL,'(^s tile cttlile and till" .s^'ear is started. stopped, and rexorst'd li\' a helt-shifter tlirou^di the niediuTii of IcM-rs con\enient]\' placed foi operation li\- the liasketnian. Tli<' tail-shea\e is I'll a carria.Lje and adjustalile totakt,' up stretch ot the calile. The rate of t ra\td is ti\e feet pL'r niimite. i'li,'. \ shows the j,'ener;d plan of the lilteiinL'-\ats and the discliar^'e li(ip])ers, Tlie hlteriii'.,-\-aIs iwliich. aloni,' with the others. lieloneed to the foniur sand-plant i are round, flat diottomed wits '_' t f t (liaill he 7 ft deeji Tlu \- ha\'e four-arnieii atjitators ( I'i,t(, ■< ' runnini; at 7r p.m. close to the li(;tt()ni.Tlie shaft to wliitdi these are attached is drixcn hv crown iji arinj:,' below the tank. A special stuttieL:-l)ox dcNised % I"- Kl-^ l-M t Y.Wini: /'KM IK /,. t" kr.p th>- s;,n.l nu! ,.f ,!„■ l,r;,nnL^ l,,-,> ^r..^v,l sati.ta>'turv I'll' ■■"uM l.r inipn.xv.l iipun. In ,-..M,i,,,„ i,, the a-itaturs, each "Itrnn- vai i- t,nr,l wnl, ,w,, s,x-,ndi air-lifts .lischai-in- ,,nto I'.v.M|,.tf,l,„t,tfjlaini.Kfs,,n tlir tups ut" t Iv l.ask.Ms. Tli. -r an run imrrtntiKnih .lurniL; ihr arrr.'ti,,n p. riu,] an.l scrxv t.. Li-.tv^ tlir oiars.r parlulr-; f. t hr surl.i.v, uluti.v, a- liuv >l,,v,lv s^ttl.'. tlirv arr rau-ht l,v llic surtmn ,,irrs 1. as |\,I|,,\vs: Th- Lasket is.uuvtv.hnt,, th.. vai lull . ,t pulp, until i h. top. ,,| ,h> sjats arv suhnic,-,,,p .,„,! ,,„, ,„,,,„,„ j_^_jj^^^ ^^ start,. 1. Th.- tirst s,,lutit,n '■■'nnn^MhrMU.^'h tnu.Mv ,s turn, ,1 l.a.k ,niu th. vat. It scm rlears ii-wrv, r. unl, »atiltrrlraks. Sh-uM t Iimv Lea Irak.thr ..Kntilv "' tt"' fault V hlt.r ,. .(uu'klv rstal.hsltr,! 1,\- an nisp,.i„,n ..f il,r .u'lass nippKs conne. tniL; each individual -plau' witli tin- nianitMhl. and !h;,! j.Jate is , u\ ->;;: i.y nnMnis ;iu p,..p, , s,-nuv <-...k. m i lie ////■; MdONf-: I-ILIEK II. 103 inanif'iMs Siiitinn i-- iDntinufd with inttrniittctit ai^itatiijii tin- lil a -ut'tuiiiii roat is (il.tauic'l, wliicii m tins lasr a\Trav,'fs \ in,, thru ilic basket is raised. l!'' siu'ti(iTi-]iimiii stil! ninnin;..;. and I rav- crsrd. witli its Iliad uf sliiiic aillnTiiiL;. fwv the wash-watef lank arid Imw, red therein. Here snetiiJii is edntmui'd with t'recnn tit titration ..f ilu' tihrate toward the eml. till the solutinii has fallen tn the |iredeteniiiiied nniiinniiii net strenL;th uf e\-aniile. 'I'lie displaeeiiient is i^'ood. alumt 0.7 ton wash-water !iein.i,' needed per .:i:;^ '■m. \ ii Fi,- r, ICiid View ..I M.,. ,r,. l"i!.,T-Ha-ket. '"11 "' 'Ir.v slinie: the eake m this euiiditiun 1 arries almut 40', nioi-ture. s,, that e\','r\- ton of -dime is a raiM.l a-am and run mv,t t Ik- 'listharL;(-lin,,|„ r; the Mirii,,n i. coniinu.Ml till cxrcss nioi-mrc i> ivinovr.i and llim an air-piTsMiiv ut .T. 11,. ,s tnnud mm. m suowssivf Masts nf a Uw s, r(,nds , a. h. Tin. ransrs tlu' , ak,- nf shiiH' tu dn.p ,,tl. the -lisrhai-u,. a^vfai^nn- alHiut s.V , , ,t ..„n- plrtcnrss K\vi-\ ahfi-natr .lav tln' tiltrrs aft- (leans, d liv .ul,- stitutnv^ water, nn.l, r l.'()dlK ,.r,>suiv. I. .r air. On radi ha-k.-l ''"■'■'' •"■'• '"■" ^I'-'i'ial air-inaintnlds c,,nnr,tin,i,' wiili th.' iiiMdr ot carh liltc'r, at iH,in;^ tour l\ct fn.in the . nds, l'r.,l,aM\- th, ^c • ■"ulii 1,.' nniilird, and llu' \arnuin manit..ld 1 r used f.,r llir pi, nuni •'■^ "■''" '!"'"■ 'lisiiiari,'>'.l .hitli:,' ax'cra-.'S ti^' , ,v,./;,/,v and is -luuv.l tVutn tlu- I„,[,|,rrs inK. the uast.-llunir, alM.ul a tun "' "■■"^■'' ''<-'i',^' iisrd f,.r .■arh i,,n ,.f slmu-. Tin- -radr ,,( Hunu' tnr this .Ja.s nf nialrrial is '■■ ,„ ,„ p,.,- f, . 'n,,, tf,,,,, ,,,„_ sunird m a smi;!,' cvrir d< pends priniarilv up..n thr tl'i.ktuss "t tlir pulp, as an mstainv, a pulp ,,f L'O' , .,,!,, Is will sranvlv huild up a ..nrdialf im li .oatm- m 1(1 hr , wliilr pul|, ..f 1(1', s,,l,d-, will iruv an m.d, cn:auv^ m l\\., t.. thnr hours. Thr [iv,vuy,v thukn.-ss tnr K.St war was 0.7-1 ,„. ;,nd tlir tnaxiinun, fnr anv n,,,- ninnth l.j-1 in. Tlir tinir nt' thr arrnimn ju-rmd is ahnut "tiiivr and nnrdiallhnurs. uashin.L; and disdiai-mu t ;ikr thr sanir. niakm- al>nul Ihivr full cvrks,,, L'-| j,,-. „llli tunc fnr rIlU'ri,vnr v maltrfs"' This IS cnnsidcM-aMv Inn.s,', r than is thr vxvmvmv (dsrwli,.,-.- and mu.st 1.- atlnl„it,-d tn ihr lar»r pmpnrtmn nf dav m thr mat. rial. n,:nn.„r one in.)nth. wlun c'la\ was nntal.K- li'ss. thr awra-r f.dl !" -'.•).-. hr. f,,r acvrui.m and _'.!• hr. f,,r washm- and disrhari^r. Tlu' a\vra.<,'c' Inad liandk'd n, racli ,v,lr is rlnsr In Is t,,„s ,,i ,lrv slim,-, sn that the tw., units in this plant haw an a'.vraur rapantv "t KIN Inns prr dicni. Tins has n,,t 1„,„ nj.iaiiud m pr,..ti(v nwr anv cxtcndc'd prrmd, hut l hr liniitm,- fartnr lias nm l,rrn the hltrnn,L,r, sn that the ninnthlv rapantv ■,{ the plant has l„,.n vnnsrrvatuvlN plavd at ;{,()(MI tnn^ p,,- nmnth. I'lft v-n-ht prr wnt nt tlu' tnial .nh,t„,.n ivr.,vrivd frmn tlu- plant has en: :.. thrnu-h, ""' "'"■'■-■ '^'^""'1 this p.„nt the pnuvss ,s I hr sam, as ,n ativ c'vanidr plant cxcvpt that il,r sump snlutmns. aftrr Ikui- s,andard"- tic.'d in Mnra.i^r-tanks, aiv ivluriird l,y a thtvc-plun.urr pump in tho null. ■;in,ir up s.,nir nf tile drtails nnt N-ft toui'lu'd upnn the fnllnw- hr 'pu stinn nf thr Wear of tlif filtt'rs is an iin- in.i,' IS tn in- not,', pnrtant one .\n x!r, nir Iifr nf Id Ti,,„,tl,s i,„., i ., ...... i THI: MOOKH 1-ILTI:R //. 10.) some casi's, hut, if hadlv mack' .,r laivltsslx- handle. 1. tlK'\- ri(|uirf icinstant atti'iitioii. ivpairs, and rincwaN; halt a c\(l.- per dav ran easil\- he l,.,st in tins uav. Six ninntli-, lan he taken as a fair a\era>,'e life, this, at a niuntlilx t(cina<;e of 1,. ■)(!() per hasket, makes the eiist .")e. jier tun. In uiher jilants wliere -mailer filter.- are ti.sed, the canvas is stretelu^d on an mtirnrd frame of jupe and so kept taut, the i)ipe at ilu same time, serving for siuti..n and diseharKe-pressure, In the .Standard j.lant ncj trouhle hr, ; heen expenenei'd from lettin,-; the filters taki' tlu'ir natural lian^. and when the plant was hem- ,iesi,i,nHd. the stretehint,' of the canvas over a frame did not appeal tons, holh heeause of ad di-'\iii' is used elsewhere with suness. From taiim.t,' a\t ra,t;mi: ahoui S.s pt,- [,,n the a\irat,'e n ; urn has heen KV , ,,f ih,. ;,r„|,] and silver. llu' ,i;'>Id alone hem.u close to !•()',. Ilis^dier results haxc ht < n at times attained, and the mdu'ations are that the avera-e for the present vear will tend to apjirejaeh these fiL^-ure s. TIh' total extraction from the ore is as ^riven herewith: the- third column .^ues the' re'sulls for a Sl'O ore, this heini; ahout the- a\erai;i- fo; the- mine': 1 1| > M I l\r cent Per eiiit <<\ lir"(Itut. (.f cTiiiie nre. Valut Ki'i civcrv ni tlu- mill . ,-, | Re-eo\-c-r\- iii the- sliiiit- lijanl s:{ ,')t II Sill Ml 7 1)4 T.iial Sl.s 14 (."e'liipariii.e; this with the- old nu-thod hy per, e.latie.n. we have- I he- f( illc m it-ier iiMi Ri-A i:\ I ( r.iA //'/■. /'A' i( //( /•: Rrrri\(r\ HI til,' mill . i> I i;| n < | _> m) 1< _' .", iii 1 ' 'lal riroviTV Ml J ,S 1 7 > 1 i'liK -aiti (if :!' , or (i:) rciit^ prr ton is >in:ill aii^l liarilK- iiKire ihan rtiMUL;!) t.. cmt the uxtra rust wliicli ..n tlir liaq-; of work iluriiiL; last fall i-, _'_'c,. so that it dors not furnish a stroii'^' arL;niiu-iil tor fin,- ;^'i-in'ln:'^' in ias,'s wiu-rc the whole |iro,hict is anicnaMc to prrrolation. Hut so far as this ore .^'ors. ami nianv like it. thr r-iinparis.in is l.y u<> means tair. Uiiilrr the f.inncr nu-tho,! of trcatnicnt :i()' , ,,f tin- tailiif^ was left in the ponds. iM'ini; unlit tor anv hut slim,- nirthods The revise,! eomparison then wouM \iv as foH,i\vs: I'.rii-nt;!,..;,' I'i'rcemai;e • il ,,t' "I'l iiie'li'i.l. i.r.Mliut. enicl.' ,.rc. V.ilue. Krio\-ere,l in tile mill, (i4 li) II S I L' s(l I)iseliar>,'ecl tr,Mn the null 36 ;i(i II 7 H) I.eft in the ii.>n,ls . 30 111 s -j u; CnUK to e\am,le plant 70 L'.'j J .-,.1)4 Sa\e,l in eyaiii,Ie plant "0 17 i> '.i 't'2 T,.t.il s.ivin^' Sl.li Slli :{■_' This shows a i;ain of .•<■_', PJ per tun. ii^norinn anv liitfVrence in idst. In our work last fall th.is , ante to s(),22 inereaso. so that till-' net ,1,'ain is .sl.'ll) per ton. Rotn^hly. the plant cost s()(), ()()(). tlilant. fully justify- ing^ the in\estment. In addition to this ijain is the ahility to treat some }().0()l) tons of aecunnilate.l slime, whieh has thus he- ■onie an asset. The alio\e eomparison is on thi' tii,'ures of eost aetually attained; usin.i,' the eost of .sl>, estimated for the future, the gain would he s-J .',7 per ton. The tollowint,' taMe .ijiv es the sej,'re,<,'ation of cost for the various dep.aftments : (ieneral expense, nulieliii:; sujn riiUeniUnee. w,it> hman. assays, msuranee, taxes. , lieimeals. supplies, ete ' $1 ''(12 Re-K'nm!in,L: ... ' "o .^72 M.K.n- pr-.eess ' ' ' ' II ;i!4 /ine r, „ an. H .».■ 1 'liital m slime pi, nit , j-j ;j.j() I'linds. e.illeetmj,' ami h.imlliii:;. with team (I |20 '"■•I'l'l '"'.il . $J.469 ////• M'hUy Xhv i\^M■ harrow jicrrolaiion nicth..,]. f(,riiUTlv followecl ihr rnst was s-J ■_',-, This ti-ur,- ,,t SL'.47 is tor a rcstru-tol tonnai^'c.' aii.l ,antiil estimate on a l>a>;s ,,t :;,(MI(l ,,,„., ,„.,• „„,n,h l,rinL.'s the cost .lowii to ._>, Futurr work siu.uM inipn.v,. rvcn on this Mention has Invn nia.h- of the a.vunuUat..l tailin,L; This material has lucn nia.lc availaMr tor ininicdiate treatment hv the provision "t a sto. k hm ..utsi.le the -rm.hn- house It i. ...nne.ted on the "lie si,le with the jH.n.ls I.y an inehn.d trark an,i a stationarv haiihn.L; system and on the other with the tul.e null hv a steep laun.Jer, into which the tailin- is ted from the hm. nieehanirally In the ease of ,,re of this kind with .|ualiti<-s ,,f verv sl,,w settling, the addition of dry material is a deeided advanta.ye to the plant, as It increases the i>er<-enta,i;e of solids and lessens the time of settlm,-^ It is prol.ahle that this ,.utsi,le stuff, not havm- par- tuiiKited in the violent a,i:itation with evanide solution aeeom- phshed m tlie mortars, and moreover onlv eoniin^' into contact with the solution that reaches th.^ tul.e-mill alreadv Aveakened from its original strength of two poun.ls l,y the Wanicides' in the ore, does not yiehl as hi.ijhly, and so euts down the average extraction pro rata. To the experienced cyanide man a ()uesti<.n naturallv presents Itself as to the accumulation of weak solution. The addition to the hulk ot solution comes from moisture m the ore an.l from the wash-water, the k.sses from evaporation an, I leakatre and from the disehar-e.l tailing. On the l.asis of the drv ton, the addition- are ().()!l ton ~- 0.7 0.7(., while the determinahle l,.sses are 0.47 ton This indicates an increase that is not lound in practice. Hut it It were, the extreme weakness of the s,,Iution would make such a ,t,^,in not of hrst moment, just how the difference is t.i he aceounted for. is not clear, hut it is ,lue in part at least to the ,lifH- cultv ,,| corixrtlv daivrminin- the moisture in the disehar,i,'e, 1-or vears the concentrate has luen treai,-.] in a p.m. with a lye and l.Iuestone chari;e. -ivin,- results that were ,.nlv satis- tactory because no way had appeared of hcttennLT them.' Soon alter the shme-plant had l.een put in operation, the experiment was tried <,t treatin.^' the concentrate with stron- cv.imde sr.hiticm and with added ty I OS Ri-A i:\ I t wwiDr: I'rm tu /•;. ami I'linui^li watrr t . l.rin-/ t !u |iul;> !■. al.nut ».'>' , solids, «i\ iii^; the rdii-iisteiuc Ml' tliitk 1 rraiii Tlir « hari,'c is ^'nniml Inr is hr. ami til. '11 >\am'lf i-, in, i' mIui i-J. \i< 1 rinir the snhiti'.n mj, to a stniiLTth Mt _M 111 prr tun (liiiidin'^ is .(MitiniuM with the adiii- tiun nt litiir aii.l i yaiii'lr at imrr\aU. the oiir tu insure alkalinitv and the otliir to keeji uji tin- -tren'^'tli \<> the (jriuinal. Alter ahout 71 hr it passes tn the set'ler fur ■_'! hr. further a^itati'm and tinallv 1- ihhited with mill sulutiun and tinned intu the sliiiie-plant lluiiie luward the end uf the ujieratiun. sanijiles xi the pulp are taken at inti'r\aK, washed eleail uf s'4 4' ; ; eust. s|:i ;{s per tun. On si.-,|) euiieentrate the j^am per tun amuunts tu s].") J.! in extrai tion and .s,">.47 in cost, a total t)i s21 .'-'L'. To the a.lvoeate of tine ijrindini,' tlu' ri'sults I have ijiven may ajipeal with too ,,'reat foree Stalllpint,^ if fulluwed at all. must almost uf neeessit\- lie in sulutiuii. and the luw cvanide eon- tent dem.anded l.y mort- than one faetur is apt to ,L,'i\-e luw results a* rej,'ards the silver. in an ure whu h. l.y reason of alisenee of coarse ^old. will yield th.at the furmci' has ;^'reat inherent ailvantaL'es in cheaniiess ut iiist.:!!l.-itiuii rni,! ;.ii..r-iti,in -iilI .r.-, .,.■;.■,.-, m I III: MonRI; /■//./ I- I,- If III!) am.hantv u„h ,1,. .l.tails sl:„ul.i rnak. ,l„s nurcasni^lv .v.Knt 1" '"tni.an.-,„ „„h -Ir, antatinn. apart imm tlic tart that tor ^..mf '"■-■l>';'ntat>,.n .s.-n-nvlv unsuitr.l. ,t dorsawav with the cnormou. lH.lkn(snlut„,„..tn.nu:,rr,.,M.atolua.hin.v In t„u-, it is l,rh,.u..i ' >^'t'.n,..„u.tallur,n.,s l,..,,,,,,.. I,,,,..,- uUnrnu.l on thr principles "t the svst.n,. ,t will 1... f,,un,l worthy of more eonsi-k-ration than lU-rrli >ti ire \''i h i[ ^i TUHI-: MIIJJXC IX K()Ri:.\ iSf lilenilifl .'.', IMM. 'riir l-Mitiir: Sir W'l ;irr ;il prr^nit r\|iiriiinnlinL; mi .1 praitical ^calo witli rr-Linndiiii; 'uir n iiu <-mrali' in a f.ilic-inill with i \ani'i(.' '-iiliition It iinuiTi'il til iiir -iiiiif iiiiiiit lis at'" that tAaiii'lr ".!iiti"n • M\ili| he u^iil Hist as Well as water, w hni rchiriii',; nur , ■ 'iii cntrair \(i slinif. ami i'lii.UiualK- scnir (it the i,'(iM rmilil he rxirai ttil wlnlr I'v^. 7 I^N|uriiikiital l'>ani.lf I'l.int '^nil'Iiii'j 111 ntlirr wcifls, tlu- tulir-null imiM ].c used as a '^riinkT aiiil a;.;itatiir I'liiiiliinrij. This I iiiiipaiiy :()ri(iital Cuv.. MiiiiiiL; C<> ■ lias iniistri^ tnl an fXlirriiiimtal jilaiil ci insistin;^ i.t' mu' tuln'-iiiill il'l l.\- \2\ t't . > . twii iiicihaiiirai a;_;itati'rs with pluw" shurs iS !,\- () ft iliaii! . thrri' tiltrr ami sttlliti^-lMixrs 1 4 li\- .*> Ii\- ."> 1 1 . ' . 4^ sr)iaratc--r''!""1 '■- .-1 -■miiiMMUs ,,nr, tin ,u,„,.ntr;,l.- is |,„1 nil.. tin. I,,,,,,,..,- uith .-vani.ir ,M|„t„„ ,,n.| u|M,n ,,,•,..,„•.' tliP.uuli ,1,,. till.,' null 1-, n.'arlv all -nmml i,, s],,,,,. anj a .^..,.„. pm .■nta",- ..' ""■'-"■''' '^''^'''.rl,,] At tl„.,„,l ,,| thr n„|] i.as,„t/lr <■. ,n>vnt rale an.l , Uar water, that passu,- ,,v,t tlu' spit/kast,n is il„- ( vani.lc SMlutiun an.l s],,,,,. The c narsr r.,n- K'K s AniptluT \'ifu of the SaniLV c'l-ntratc that may escape from tlic tube-mill is caught in the settlinK- l'"xes an.l a,i,'ain re--n.un to .s:< m ;.>4 liours. Tlic slime concentrate an.l cyani.ie solution i)ass on to an !!'!!!;""' "'''''', '^''^,''^''''\^^'t >n "if'tion (i;5 rev. per min.) and the ..■•ui:v: .•.■•.•.■.■:c.;. r,^\\ i;,^- pi.„iuci is aj^'itatcl t.jr alj.)ut 1.') hr the muller ,s then raisd t w,, feet, the a-itator st.^pped an.l the cn- li-' Kli l\ I Ml \//'/' I'K W //( /■ rt'iitnitc .illi.u, ,| iM >rit|, It t.ik. ^ ,.l..ini Mile li..iir I.. M-itlf > li-ar. liy the .i.MiiM.ii .it sMiiK' tinlk .>t lim. it .cuM 1.. iiiack- to st-ttle in half an limir I pic l( r t., n^, .,- litllr Imu- as iHissililo hirause tllf strniiL; alkaliiii -...lutinti , iisuiiu ^ a lari;c aiii'iiiiit ,if zinr. Till . liar ( \ aimli v. .hit inn i^ .|, i atit<.l l.\ a tl..at -ipli..!! int.. tilitr- l.ciXfs an.l Ir.iiii tin re it is run tlirmi-h tin /in. l...\r- an. I tin l,'..M Vrcripitalcl Next, the stfnti;,' |.rii. ipiiati'd t\am.li- s.-lutinii I''iU' '^ 'rul-r-MilI .111.1 |-;\|.rnniriital ( \Mni.lr I'l.ill !i-..tii tile stinii. '~^ puniiif.l up t, thru scttlr.l au.l .InaiUr.l, Fiilldwiiv^ tlii> . . nir tw.i suc'ct'ssuc weak ryani.K- washo m rfni..\-r i'\-aiii.lc aii.l '.^..1.1. an.l tinally a w alt-r-wash \\liicli is run thr..u:4h a f..u . .!' zuu-lmxi's t.i wastr. Xnw the rhar.Ljc nf ah. . lit li\T tmis cit' rUan ...niriitrati' ^ 1 1,,. i;.. .1 .;vi :iuu i:;f itl" iS a. I. led. TlHI Ml I.I.I \i, i\ /^-,,/./. I '"'■1 "..u ,!„■ .•.„ta,-,r u,ll ,i,.,l,.,..,. „s,.l, na.lilv an.! ,„•,■,...,„„■ •'"p; ^l"-^' Tl„„„al„va.nu.nt takrs .' H,, ,urv 1 .■ ., I, a,„at L ,„ iin.l .1,, antali..n l.ritiL; .|..iir in t he a-ilal.T, K'- l.-lin^ tl„. ,,„„,.„, rat.' an. I .van,.|.. ..,h,ii.,n unli . , „n- ^"■""' "I "11. ■ t.. one thn,ui;li lli.^ "■mill, uc arc aM.' t, -ct 111' a.^'it.it.iiN will ,,n|\- "'• lini-t :;iin.lin^ an.l lli.^ |„.st rvMilts ' ''^';'' '"''•; ""-'1 "•"-•'■" ""'am a hill .lia,-.. Wn.lr „n.. at;it,n.,r '^, '"■"'^' ""'"'■ ""■ """■'■ '^ 'i<''-.n„n,u an.l j.^.ttinu iva.lv ,., 1,. ,li.. ^■''^""''"' •^"''" '"■■"' ""'"■l^'>""i-''-.lra.iin.4tn.mn„ir,.,a..Uat.,r. " '"'"■/^•'^ ■■"" ""I'-' ^t.H k . Nam.!., val al,..v... s,, ,l,at uv , an a.j.l """"'^■'' ^"'"""" '" ^^■'■1' rUr laun.l.T .l.-ar Wi,h , U-an ..,„...,- iT-alc II IS n.vi-sary t.. liaxr a step i,.ra,l,> „''''", ^"■'■"- '>■••'""''■ ^"1"""" '"»:!■,, IS us..,l ,n ,1,, ,„1„.. "»'■ .ni.i a,nat..rs. ululr .1,,. -wak .,nr rn,,,l. ,^ ,.,! t, .r waslu's - "';!^;"V ^;- 'vani.l.. ,s a.I.l,..! .„ t h- wak .. .luf .n. I.,„„. ,s ;"7''' '^"'"" '"" I'"""'l^ iH'r t.Mi, u„l, ih,. ...n.vnttat,. as a is ii'.l Hit. I th,' mill ^ ''"''" "''' """""' '" '■^■^'""''"■'^ omr,.„tfatr luiv ,s l,v mixm;, "it.i IS' , san.j and ponolatuii,' m vats tnmi _>l) t.. :;() .Javs This nirth.Ml .^.,vrs an avrraijc rxtrai-ti.in ,.\ so jr.,- ,,.„, Thr .xtrac ti.,n (,I,taiiKMl at piTsc-nt with thf tul.r-null an.! ayita- t'.rs „n . Ka,; ...n.vntrat.- is !•:!. , Hy ^ra.luallv makim^ impn.vc- mrnts vvr mav p,,ssil,ly in'ttrr tlusr result , ■ I liUtahall.ir. K..rra. Iul\- _'(», |<»()(i. m (.■\'A,\ii)i-: pRAcrui-: at i:l ord i l^\ T A Rli IsAKll tSepli'inl'f; J^t MHCi' T',u: iK-wlnimu lit I'f tlu' niillin:^ practice at 101 ()!•■> :- lull III iiutrcst. 111 1^7:; a lull ii-ihl,i dc hciu-jh i,'. nr fciluctiMn plain, was erected tn cru^li .ire and treat the aeeuimilated tatlin- from a still 'ilder ,in\isli'i\ and to this plant lurtlu r are heiiiL; mined t'H|a\ .\e\-r- thek'ss, the enntract t'..r the treatment ni it was cancelk'd at'tei- tlie iiurehaser had installed lour atnal-amalim; ]ians with settlers and had started to slup ladlion. This was under the reL^itiie of (ieneral i'risl.ie. In 1 s'.i 1 a Chilean mill wasliroUL^ln frotii (.'liicat;o. to <^'nnd the ore after it passed throu,L;ii a Coiiiet crusher. The Chilean mill did liner -rindint; than the stami's, which at that time \\ere also jrt ceiled li\- irushers. of tlic I^lake t\pe. Tile mill in tui-n left a dump which. eNi'iittiallw asinilliods impro\-ed. It liecanic proiitahle to re-tnat. Late mi Is'.tl. lames H ilaii.i^ir IjoULjlit control. In the foll,,w-ni'4 yeai the old-mule s-.aMe was eo'Merted -,nto a cvanide annex. Re dw 1 tanks wiili lift. sta\-es and 1' 1 f • . ihanieter \\erc (M\iteil; the sump-iaiiks were lar^^cr. with (i-it, staves. The tailin;^ was carried, in Imxcs on the hacks of f',-iii!i-> and 111 liaiiddiari-ows, to the \ at s. CKanide solutii/n was tirst itiiroduced h\ upward )ii rcojation throtii^h a talsr liottoin, tile stieceedini^ water-w aslu s lieim,' applied troiii ahoxe. This was tollowed l.\- ]ir( cipitation on zinc shaMiii^. with acid trealtnetit lor the ziiu 'shorts.' the hulk of the iifecipitate hem- carcfulK washed and milted torthwith. Tlu hullion thus ohtained was of extraordiiiaiw tiiicness '.Mil) to tl.sd without the Use of aiv nitre in the meltint;. This was oiu of the lirst successful i\ anidc plants 111 Mexico. With oi,i\- the addition o! the small . \ annlc ])lant just descrihed. the inille pan! S 1 .011(1, DIMI ill dnideiids uji to Maw l.S'.I.S, hesides iiieetinc the cost (jf various installations. iiiclu(hn,t,' part of the l(H)-stainp mill taken over h\ the Ivm^lish eunipati'. , '.vhieli now cuntrols tiu piopvii;. rr.i \!i>i: i'r,\( tk i-, ly /,■/_ (,/,.,; / 1 1:. Fn^l, The tii-M KMI-Miniip mill wa. .Irsi-n..! un.Kr -hr Ila'-m- «■ iv,l;iiih- anil wa-^ ..nix- rxprctcj x,, ,ru^li 4. -(in t,,ii^ [kt Hionlh thr..i,L,.l, a ti(l-„K >1, srr.rn Wh,^,, tl.r ,in,|«.nv was ,,ur- cha-cl l,v il,,. l-xpluratn.ii C... ,„ lv.(s, tjii-, mill uas tu,', ,„■; , ■,.„!- I''^'""" '" '"■ .''''■'v.l. Th,' slmu'-plam x\a-~ a.Mv.l m l!l()c, aftrr '!'■<■ pn-int u..nij,an\ ha.l 1m, n turmr.l. W. K. HrU\ lia.l r,,,,- • Uutr.i a srrifs uf r\|„-nmrnts t..r th,. n.w ..uiirr-, ami ,l..ul,lr tivaiincnt was 1 1,,,, ail.,pt,.l lur tl,.- slmir-piam : n was unlv makuiL^ thf l.cst of r,,n.liii..ii> as ilir\^ wnv (.unul; Ik^ikv t hr pil, ',,( si,,ivd tailiiii,' now alMuu t,, l„. n--] i-catcd. Tin- -cmral plan ,A irratmmt was as f,,ll,,us; F,-„„i tli.^ sramp-hallrrv liu- pulp pasM.l ou-r .npp,.,- plaus am! was xWu .rv of nrw orel,o,lies. l,nt m.lireeth- throimh the eheapemn- ot op,.rai 1. ms, so that fun her eiilai-enieni of the null l.eeame pni.lent. In Mio:, anorln^,-. an.l the last, a.l.litioii to the ivdueiion plant was ,„a.le. The nev- mill of 1(H) stamps. with Its iip-io.late evam.ie e.|uipnienl , .litters fr.jni the oM ..nc m ti\e resp.-.'ts: 1 Me. hanieal l-:an.lliiiL; of the ore. - 11. a\ier si;mips, '■'< ki'-,L,'rin.linL' m tul.e-mills. -1. .M.'.haim-al han.llin- .,f san.l hv .list nl.m. .rs. exeavators an.l helts, ^. Me.ham.al aL;itati.,n of sl,nu l,y stirrers an.l eentnfuiial pumps. Ih.' new null e.mtains Kid s,an,,„, ,,.,,,,-, „,iohin.,' l.l.M) II. t'l'hr.L^ |(l_' ,mu-s p, r immit, . with a (i-m. .in.p, Tlie .lepth ..f .iisehai-e is 2^ to .-{ m. with a new .he. an.l .'U m wl-n »!-■ ,!,e is w.,rn .,,11. Wov.n hrass uir.-senens .,f ;i.- nush aiv use.l 1, 1, ii ■ ;■ = ! J X '— -j A: ;<:. ikiWT V^*:t::"^fc::-::; cy w/i'i-: r/<.\( ■/■/([■: \r /•;/. I 'A'" /. 1 1: liu' a.vn„,,,a,u,n^ .l.aL^ram- , F,^ |(i ,lh,stratc- • Ik- ..nnr^s an.l >p„.kaM.n uhi.l, M.,,aratc- th. carsrst sa„,l an,l .crM u """■'^''"-"""^'■"■•■'->'-'n,ln,^. Tiu- fim.san.l m.,,, ih.Mann.s -■'"'■"irs uuh ,1,. Mnnlav ,,r,„lnr, tn.n , l,r u,l„-„„IN an,l ,. Hcvaird l.v ilR. rati-uiu.l tu ,1k- >an, l-.-nlk-.nnL,' va,. \„v la-„K-rs. TlH- san.l ,s ,i,s, nl,tu,.| l,v a n'V(.lv.n,L; nKTl,a,i,s,„ ..f ,i„, m^„„,,, ^y ^,^,,, ^..^^^ .,,,^^ _,^ __^- ^^^^ chemu-al ,rra,nu-n, ,„ , Ik- san,l-,v.vu,-,-, ,1„- „l,-a Ikmh^^ tn k,,.,, '''","""■"■""■'■ "■'■'■ "■""' >-^-a""''' ^^1»I-' Hl..,,,,^ a (,nal sq.aration •;' ^'•'">'- -■ a^ '" ^.l a .Iran ,,n„hu-,. Th.- wat.-r an,] sl,nu- arc 'Irawn m„ il,n,u^,l, ,^atcs .„• sl,.,s ,,n ,Ih- s„!,. ,,,■ ,];, va-s- thrs,. ...irs a.v rlnscl l,v a n,il „| ,anvas as , h. va,s 1,11. Tl„- san,l, wlu-n thus nnallv ,v.,-,l f,-,.,„ ,,,, ,,„ ,,,,^.^, ,^, ^,_„,^,^ ^^ n,unv,,] |,v a Hla,s,l,.ll .x.avatn,- wh,.h .h'nps „ thnn.^h a .vntnil up.-nnv^ "n,n a R,,l„„s l.l,-.„„v, v,,v Th,. n!a,s,l..ll rxrava,,.- ,s hk^ a rrvnlv,„;; .hs.-lKuTnw and „ has pn.u.l a nins, Hh.i.n, n,a. !„nc It usrs r,,n,pa,-a,,vc-lv 1„,K. ,„,^v,-^ an,l w,.rks sm.„„hlv Th.- '"■'' ^"'i^>'-^'"- 'ak.-s ,hr san.i ,o,n,ain,n,^ n<,^v „nlv irum in '" 11', n„„s,ur,-i ,,,,1k- ,,Ta,,nrn, x-al . wh,rh ,s f,.,] hvanvohni- .lis,nl,u,,„- ,,p,.ra,r,l l,v a va,-,al,K-sp.v,l n„„,„-, ,1k- c.-n,nfu.-.^ t'To- hc-m.^r ,,, n-,^,ula!r,| as ,.. ,hr,,„- ,1,, san.l t,, the s,.i,-s ,„■ o „,,v ;'f "'- va;, as r,-,|u„v,l. The- duuvr .s -i^r, ,.,ns, .1,-v w.„ht '"" ""''^^'"'^ "' alten,a„-l\ „u-,l,un, , (1, 1 ' , : and st,-,,,,- ,ir" , s..h„„m a,v uur,„h„.-.l, s,x ^-.u,-s apart. This t.vatnunt is f,il- '""■'"' ^'y "■' '''- "'an th„-,v -ueak- waslu-s, sud, a h-n-thv "|H'val„m lK-,nL; sp,-r,a!lv .l.s.^^n,-,! ,,, .-x,,-a.t s,lv,-r Tins,- -uvak' washes are t,,ur t,, six h,.ui-s apart an,l ,,,niain III,;;' , KCv i--.,,.], wash,., e.|ual ,,, 1 .S t, ,ns , ,f s, ,lut i, m . Ain-r t,va, ,n.-nt. ,h,-' n-s„'hu- a.^'a.n ns,n- the- Hla,s,U.ll nia.hin,-. wh,, h n„,v(-s ,,„ rails ,s ,]is- rha,-.L;,-,l nnt,. a e.nn,-v,,r ihat takes it to the ,iun,p. Hen- the .l.^t,-.l,u,„,n ,,t ta.hn.L,' is n ,,ulate.l, as the aeetnnulalinn ,n.,.,,,-s hy a Inn^e.l !K-h.,,nvevur ,n tu., U-nL;ths. ,he la^t one heinK swung round aee,,r,l,ng to the e,,nl,,ur ,.(■ tll(- yi-,,-an,l. ,,_'"";'"*••'''.','>■ I^m'issi.m fr<,m -The Grin.lintf r,f Ore \.v T„t,o.\liu, ^^., r-np'-'ir. - Kl Dr,,. V^Vfr. mMiiM a rletalli-ri aLcuiml (if Iho ryani.le rr:u-iro at F 'S fi IIS /\'/-,( /-.A 7 ; V.l MDI: ll<.\( Th'F.. The slinif -ur- I., a .Mllctiii:: \at. fn .ill '.\Iiirii ilic tliirk iiuid 1^ 'Ifawii .ilY at tin- Ijnttiiiii and tlii-.iwn into our .,t tiir irrat- mmt \at-; Tiir-r an twclxc uf \\u-m-. catli :U ti diaiii and 1 _• " 'li''-I' IliTc it 1- a-itait'd with a pn.|MT pmii. .rtinii ,,!' , \-aiiidr Milutinii. wliuli H mtroihui-i -n!niltaiicMUaraiu-~ I'M- >tirrin,v mn^i^is ,,f i\\,, Ion- and l\\'< slmrt amis iiiailr >A nak li'iltrd t'l a sti'cl star. 'I'lif oak anus arr «<]]'] ; tht-v taprr mn 'Aarn-urs tort Invith. partii iilarly as i\':,'anls the dissuUnion ot thr siKav, l.cad salts wii.n .i^ldrd in t'\i rss t,, the cvai hition, .L;i\i' a iMTi ipitatf ■■(' l.asir Irad ryaiiidc Iml wlini prcsriil in mall lu-oportinn the irad niiiaiiis in s..luti..n, |irrsuniaMv nwiii- to ihr fonnation oi an alkaiinr ].hiiii!.itr .Kd'M)_.. l,y iXMition with the caustii.' alkali, tlui- i'l.A. , 1K( 111 K ,l'!o,, A. .'II.O Mi'r( urii' rlil. .ridr is sonutinu-s i.-iii].h i\ rd lor i ho ~.anif piirpi ise, lii-odiiriiiL; a rraotion with the Kt y so a^ to loriii a sohiMo douMe I'N'anidr. t liii-> ll;-;*:. ■ IKCy K.ll.L^ry, _'K(d Thf most nsrftil v\i<.v< of thrsr soluMr load and nicnniw coiiipoiiiids is the i\'nio\al in the fonn of insoluhlc ii-S and I'l.S, of any soduhk' sulithick's that would otjurwis,- fctard the solution of s,'olil and sih IT. and w hit h may f\ rii re prri. ipitatr siKa-r already dissohi'd : K S ■ K,il-('\ , ll-S !KCv h-.S K.1'1''). ■ -Mi J I I'l.S IKDli Till' iloulilc iiitTi uni-iiotassiutii iw'anidv also acts as a sohaiit. attac'kins,' i,'oM inorc vradilv than ^implr \\V\ . and this aciton is indept'ildciit of tlir prisoner of irw^^rii. L;old n plai Iiil;- moi\ luw ; Kdl-CA, - All K,.\ii('v, - il-, Sih'fV is siniiharh' dissoKa'd ddirsr rcartioiis lia\r Itch anipU' \i'riticd. 'riir aotion of nu'mii-io-potassium i\anidr on ^old is tlir liasis ,,f patent soured li\^ l\eith and H 1, the latter also claims the use of lead as faeilitatiilL.' the solwnt cffi'et ( jf cwmide : /. ( )\\\/l)l-: l'l<.\( Tit ! \T 1:1. nRo I I I!) .s..h.ti..n. 1),. \V,Mr !,.,s a ,,..,.,t invKm:; a.Miti.m .,f 1,,.,! "^"''' t" 'vannlr .,,]„, i,,„. Th.-r r, .mpnunH. als.. inlhu^mv ITrnpnaliun 1 .nirtKial! v if tliry rmiain iii tlir snlmi..,, up u. tl,r I-nit -frntrnn-thrzinr l„,x, a^ n, that rasr thr k-a.l aii^l itictvurv '"■'■ I">'''!'i'^'t,'.l nn \\w zinr. tnniiiiiL; ziiirlra.l aiij ;',nr-„icn ury '""'■''" "' '''-'' •■''''"■.MH,,ti\r lunv. In tlii^ liiv, ,pitat)-ii tlu' zmr sinipiy rhan.,vs ,,huTS wuli tlir mmurv . ,,■ Ira.l. a-, i. ai-;., tin- eas,, wlirn zinr ,liaM,iv: i-, .lipp,.] in Ica.l a.vtatr solution Thr rhai-r ,, i\u ,nn-> nlrv w.r^lit. ..1 .litnr thw ,. niixr,! v.ith a s(,hitiMn HI tiir pn,p,,rt„,n ,,| _>i, .,,h,,„,„ t-. I ,,t .!,„„■ l,v ^^<■l^ht, Thr.uluti.m r,.ntain> O.V , KCv' Amtali.m r,,n,nnu- I'M- SIX Ii,>ur> 'j'lu. \-at is tlicn till.M until liirrr is :ii, ..f s,,;.itiMn \., 1 "t slime; tins IS uvll stiiTr.l atnl tllrn allnw,.! f. srttlr Srttlm- aii'l .IrrantatiMU r..nsuinrs cn't li,,ufs. This part of tlu' pnT- (vss ,s hast.-nr.l hv the Use .,| luiir. whirl, is a.j.K-.l m ih.> irr.j nt the tulir-nnlls, 'l'li>' li'iK' has two luiu-tions. ,,ne .,t them clu'iniral. the .ith.T ]'h>sieal. Hv xinu,- ni ,!„• tifst it nrutraliz.s the s„lpbun,. aei.l •""' 'l'v"tlip...es the feme sulphate enntaine.l in th,- , .w . an,l ,lue t- nxi.lation Sueh .xi-lattun niav have ,,eeu,Te.l in parts, ,f the l'"i'' '"'t'Te It was nuned. or it inav h.ave luen .levelnpe,! ],y suh- se<|uen, ,-nntaet with the an' in its passa-e X-, the nfili , -r ."iurit... treatment . The Imii' ser' m this wa>- to pn.teet the e\-ani,lt: "I I"'tassium e- so.lium. as the ease mav l,e. In sjakin- the ^''''•'"'" "■^■'•l'' '•'" '''!<'- '!,. water f, „,rm the hv,ln.x„le 'Ca,()l[e,i whi,l, .liss,,!x-,s in waterto the extent of one part in M)() I.HP.e !S preteraMe |,, eaustie so.la, for this partieular purpose I'.rause the ealeium earhnnat.- is insnluMe in wat. r. wlnle the sul- I'i'ate ,s l,ut sl,,,d,t!y sniuhle, s, , that thc-v ,],, n.,t a, eumnlate in the '■^■ani'le solution, as is the ease with the eorn-spon.lin- so.jium salts where XaOIf ,s ,,.,,! as the neut rali/.m- a'.'ent. Soluble >'n-l-',ates are also pnMpilate.l l,y i,, -eavin- eaustie alkali in sulntioii, thus: CO, • (\-oOile. ^ CaCO., , H .(), \a,rO, ■ (a.OHi,, . CaCO,- L'XaOlI. Hv reas.m o| us physi,,,! |„„>,,on m the mill. linie eoa^uilaos shim-, so as to eause settling -f t he parlu les. The etieet .s eomplex. li.ts tilt- w.irk r,t one ii'ni! .,f kCi Th« ',\y..,^i ^i ■''^■'■^ '" i'ractltc iiKlit-U-mhs ui" Xae v 120 A7-.( i:\ I ( )\\\n>i: I'k'Ai //( /•:. Vur\] (,f till' matrria! ( la^sr.l a- -linu' is i.t a i-.,il'>i,l nattirc in.lrr.l slimr lia>l.rrii ^■iviilU lalu'lr.la ■,nlln.,| li\-,lvat>.-.' Surli mat tcr wlim l'ri.u<4lit iiiK. (Miitart with |,,nT watn- l.n.mirs aliimst urlaliinuis. aii.l tlu-iTr.iri' itiipiTxions t" ^M|uti'>ii Tlicrt- urv sc\cral sul,. Mailers, ii.ital.lv alum. an. Is, M,a]i. aii.l Hmc. wlijrli. when a.Me.l t" the tui-lii.l water. eaUM> the i;elatiii.ms m.iiter tn ei..a,i,'ulate or tl'ieeulale. s, I as to prmlueea ■-(■] laral mti mtM,listinet a.L,'),'li)nuTali(>Tis. l-"urtl)er. mmute partjeles ot ,,re. whether slimv <.r not, if siispen.le.l m waler ail . le.'.ante.l ,aii.| passes to the tiIter-\-al. ilu' liott..ni .i|" whi.'li is pn.xrle.l with tw.. or three feet ot san.l ..11 till' t..p ..f Iiiiria;.. Tlii- rem..\es aii\- reiiiaiiiiiiL; tra.e ot shine, ileatiin- the s.iluii..ii s, , that it is lit to '^n t.i the preeijuta- li. .n-h. .use Retiirnin.„' to the t reatmeiit-\ at ; tlu' slime remainiii'^ after (lecaiitation uiLleri,'. .,> further a-itati. .n The \at is lille.l with a l)(i:i', sr, Union aii.l agitation ensu.'s for 11 li..iirs. Then tolj.iw three m.ire sui-eessi\-e washes. The \at is tln'ii tille.l tor tli.' hftli tune ami the mixture is liirown !i\- a reiitrifu-al j.ump into a .jeep Settlin,i,'-\-at. I-"i\-e ..f tll.' Ii-eatnieiit .har-.'s ^jo t. .. .tie of these \-ats. of which there are six. ea.h l.ein.- _'() ft , .leep an.l :',i ft. .liameter, with a lapaeitN- of -»,")() t.)iis The siieeess!\-e ehar,L;es from the treatment-\-at are f. .1 into ..ne settIin,-\ at until it is full ..f slim.-, for as fast as the s,,lmi..ii ..gathers ..ii top it is run oft. lust sulfieient time lieiii- ,-i\-en f.ir elarilie.itioii. This elaritie.l s.iluti.)!i is s.) p...)f in ^'.il.l an.l siKcr that j.re. ipitati.>n is n.it atteiniUe.i, the soluli.iti bciii',^' use.l as the tirst ..f the washes in the treatnient-vat . The new mill eontaiiis three tuhe-mills All of them were ma.ie l.y Knii.p. at ICss, n The X... :; mill is Iti ft .s in l.)nL,' with :\ ft II in. .ham : .\ is .,f tlu same .liam.ter as the last, Iiut L'ti ft :•> in l..n'.:. Tin- sm;,!lest .,f ili,. tul....'S is found to lio nif.st w.rk per horsep.iwer nipiire.! In Western Australia the tuhes or .^'rit- niills (as they are often ealle.li have ln-en eut .l.iwn to a leiii,'tli ..f l-'i ft., hut the ore at Kal.s.;o. 'rlie is softer, so that ^'rindini,' i-^ tiK're fiui. kl\ aeeoniphsheil than at El Oro. The time roquire.l is ( )\\\/i>i-: /'KAi T/cr-: at el drd /, 121 'it'l-niiinr.] .luT.tlv !.vthrlKinimss.,t the rn,k. U,t \\w nw is U',| at thf upjKi- i:.,i aii.l iiKik.s its r\it a! the luucr, thr.ni,:;!] a Mricii. Of thf tlirrc typrs.,itnhr-niills. thr Ahl.r can !„■ tillr.i" n.on- tlian halt lull; this ranimt 1,,' ,1.„U' with t hr Knipp mill hecausc it both hlN ami .hsihari;,'s at the .■.utiv. Tin- Davidsrn lias rcntral feed hut prnplKTal (lisJiar-r. ■■vhilr in the Ahhr mill this is tvvrrscl. Ihr Icr.l 1,,'in- i.cnpli.'val an.l the .lisiliarur .cntral, Tlir last mnitiMin-.l is huilt in s.vtions arid the .InxiiiL; is .Iniic on tires and l.v -ca-. which rinlr thr exterior of the shell, lik,. a Hruckncr turnarr. The Krupp iuIm. is ,,,adc .,t wmn^lu-irun sluvts, wc-ldcd; It runsun trunnions placed at one end, so that the shell does nr.t eonie into pla;, as re-ards the drniii.i,' of the ni;i( hine I he linin.i; of tul,e-mills is an imi-orlant matter Chilled cast- ii-<.n, lioih that imported ironi Krupp's works and that made l,y l-;i Oro companv itself. l,as ;,..en tri,-d. the latter .ostin- onedialf the former and -i\in.- e,|ual wear wei-ht ^for- weii^-lit Krup] 's Imine IS from T to ,,ne inch thick. i-I On, linin,- is |i in. tliie :. Xevertheless. it is tile intention of the maila-el- to sul.stilute silex. a natur.-il (lint with chai-a.-t.^ristie conehoidal fracture, it is whittled i„.o ^hape j„ (lennany l.efore shipment. arriNin- in sec- tinns -11 in thi. k, 1 m, wide, and (i in. Ion.-. The pc l,h!es\.hat do the .-nndin.i; come ironi the coast of Denmark. Tluv varv in size trom th.it of an ,-- to that of a tist, the axera-e JKini,' ahout three incites m .iiameter. Thev wear well, (i 11, . of pehl.les l,ein- abraded durin.i,' the .-rindm.- oi one ton of sand: the consumption of linin- iKin.e 1,(1 ih. An att.'mpt is hein- made to select sonic. ,f the (lintv quartz, su. h as ,,ecurs m the low-.,M-ade ore of the mine. u> .serve as -rmdm- material. This seems wise: if the hard porti.nis of the "re can oe used to ■,M-ind the soft, the econom\- is obvious. At the time ..f my visit, Xo, :{ tube was bem.- driven at the VAW ot :;i rev, per mm., while Xo. 4 an,l Xo, T. made _>!l revolutions The dutv of the indivi.lual tube-mills ,annot be stated: 172 tons "t the coarsest sand from tlie new 100 stamp mill is t-e-L;roun(l trom :;.-, t,, l.-,0-mesh. or tiner, bv the three tubes. In additi..n. N.-) tons per day .,1 ih.e coarsest of the 40-mesh sand eomin.' from the oi,l IllO-stamp mill ,s reduced to the satne condition, makni^ the total work of the three tulies 2.")7 tons. The tube-mills ijet everythin.t; ab,,ve l.-,0 mesh, as sejiarated hv rone ,t-4c-;H. ^.1 :,,j. '!■'. ;.-- ■ . ■ , ._- _• I. .<'■., .,,, ..,,,, ]> lo J4M1IU to i.)ii mesn and tins •R"l..u-.l l„r much viiluaMo inf.,rn,ai..m '4 12-' KlA l:\ I ( ) W/lij: ri< l( //; h^ i> .•irri.iiiiilishcd as tu'aiix- as ihr as;!,i,., while ti,,. _Mi()-,iu>li ami tiiuT arc treated as slinic. Tlli■^ iuIm mill jMailiK' has stia.lilx ijaiiic.l jti iinpurtaiur, tlir t.'ii,l(iu\ Ikiiil' ti. treat a lar-cr pf ipc m-hmii .,| the pruduit lf\vry is fxtrcnu'ly small altir tin- l,i|.><- n\ a very ffw minutes if a fatal ,]<><.•.■ has l,ccn taken (hyr piiN.-i, shoiilcj 1„. ,li>,],at(li(.l |(,r the iiearot inc.li.al a-M^taiKv that is aeailahle, Imt no delay in tnatinent -IkiuIiI !„• inrniitti .1 to occur on this aieouiit. The lirsi ,aiv must 1„. t,, ueulrali/, ih-- rapid pi'iM.n l.y the anthill., and thru to cmpie an.l wash nut l!i.- stomaeh as s,h,ii and as eompleteh as possil.lr The aiitidntr ,.,nsi.is of two solution, scaled uji in hotths. and a s,.al,d powder. Thr t w. i sohitmns are to l.<' first nn'x.'d to,i;ether ni tile tin vessel in which tlu'V arc parked, \,\ I.r.akm- off the sealed ends of the bottles. The tuh. rontamniL; tile pon- der is also to 1„. l.rokrii and the wIim],. of the jH.uder added to the mixture and the dosr is |., !„■ administrr.d as s,„„t as , an po,,s- ilily I.e done. If thr paiirnt is siiH r,,nsri,,u. h,. must drink the antidoir at onee witlMui \'.aitin- for the uiscrtinn of the si.nnaeh tuhe, hut if not rMnsiiMUs. .,r iiMt r.s|„ nisiMr, then a small ;.;a,- must lie hrml>- inserted iMtuivn Ins trrtli, s,, as to pn-wn; il,r stoma, h tul.e from h.-in- Mtt-n ..ft. and tin- tui.e is tlic'ii lo I,,, passe.l down his throat and into his siornaeli. The antidote is to 1,,- poure.l down thr tulie. and is tlini to !„■ foHowc'd I,-,- sonie water. 1;. an_\- ease, either Kelore or after the antidote has l.eeii taken. Ih. stomaeh tulie is to 1,,. i-s.-rted. and al.out hall a pint o| water Is to l,e i„,ure.l dow!i 11, the palieni hein- placed in a reclining- position, a little raised ''--om the around The insertion oi the tuhc may j.roduee N-omiiin-: this. !i,,w,Acr. is cntirel\- fa\oraMe to the course of the Ir.-atnieiu When the last of the water is placed in the funnel, and l.,-fore it has all de-eendcd into the tul.e, tlie fiinnel en. I ..f the latter is to l,c l<,wcrc.| s. . as t<. cause the tul.e to aet as a sx'phon. and the st,,ma.ii .■mpti.-.l as much as j.ossihle of its contents. I"iv,h \witer is t.. I,e potuvd d<.wn the tul.e. an.l the stomach aijain .•mpti.'.l. and this is tr must ho made •From the Mrnlkh hi,'-..,! nf the eh,i.nl.tT .,f Mm.- Wcmitii .\uMniha. I J A7-,( /-.A / Ml \//V-. r/<.\. //( /, t'< ill. luce \i>niitinv; ;iftrr tlu ;i>liiiiiiiM ration ..( the ,,nip!oH.. while •"' "1^'"' ^''I'ii'^'V'T nniM l.r nia.lr t.. , ;,um i1„. paiunt v, swallow """■' "' '''•■■ ."111. lot,, l.tiurrti the im,r\als <>\ vmnitini;, it thf a.hniinstratinti !„■ not a!r, a.lv aii.l . ■ .iiii,l, trlv Tiia.l, Vemitinu ;iia\' 1,. in. hi.,. I ],y „n ,ni.iir. hkc iini>tar.l, .,r l.v II. kliil- 111,. I,a. k ..t tlir Ilin.at unli a > Iran l.-al!„r. ,„• a ],u; v nl rlran iii.lia nil.l.rr • il.r, ,,r thr lin-rr. All ami.!., .niantitv i>\ warm wal.r sli..iil'i !„■ swallowi-.i ami \otiiitc.l. -.. a. !., v.a>ii '"" ""■ -'"'"•"li ■'- m ilic previous case. SIluiM .,\arni watrr ""' l'^' ;" I'^iii'l. ".I'l "atiT may l.c cmplnvnl m it, [,!,,..■ As M.i.n a- thr stomach has l.c,-ii satislact.inh- riii],ti,.,l aii.l washc.l. an. I th.- si,,ma(h till..- a it h.lrauii. strps shMuLl I„ taken t" l.rinL: ali..nt artilhial ivs|,irati. .n Sh..ul.l the pali.nt app.'ar '" '"■ '" ■' ^'■"'' "' '"11.11. sr. an. I his h.-ratliiiiL; iia\r .,as,.,i t., he n..ti.eal.le. the ap|.lirali.,n of sm..llin,L; salts ,,r nf amm..nia t.. his ti.'stnls ma\- itselt" in.lud. hreat liim' ai;ain: hut if this ]„■ n,,t im- me.liateh- sueeesstuh the patient s!i,,u|,| i„. ,,-,.ate,l as 1, ,l,,ne ill eases (if partial .!n.wiiin..^r ,,r sullneath .ii, Me.lieal assis-iaiiee sjicnhl hy this tinu' ha\-e arri\e.l: imlee.l. il^ tlu' ].atiem he .< -nsei- ,us, there is n.e.v -feat h..pe that the w.irst etliets (.t the puis..ii will ha\e passed .,11". part ieularle it the .k tails of the treatm.nt liaxe h.vii all earrie.l .,ut, h.r eyaiii.le p..isunim^ is usually fatal within tweiile niimiles. 'I'he paeka-e for tivattiieiit sh.,ul.l e. insist ,,f a tin xessel Willi li.l. in whieh are jiaeke.l: (al A hermeti.allx- seale.l h,,ttle. e.mtainin- 71 -rams (,t ferrous sulphate .liss(il\e.l in :;n e r water, an.l lie A hermeiieall\- srale.l hottle. e.mtainiii.L: 11 ..:rams of eaustie so.I.t ilissohe.l in .iDI) e.e. wattr: an.l "■' -^ 'I'l't' eontainin^' t ',\o -rains ..f ma-iiesia. There ^h..ul.l he als., a -a.,' for the puipose of ..peiiin- the elenehe.i mouth of an uiie. .n- ei. .us pers,,,,. an.i a stoina> h luhe. that ean he jiasse,] throu,i.;h the i^.a.^ an.l .lown into the (ies. .pha^us into the jiatient's stoniaeh. This is vrrv ease t.) elieet , hut sev- eral persons in ehan^'e of the phmt sliouhl i-eeeivL' instruetions from Ilie nearest inedieal numast.. how to insert a stomaeh tuhe so th.-.t they niav know how to usi. it sh.ouhi oeeasi,,n at an\- tinn arise. The apparatus sh..ul.l luwer he all. .■■. e.l to he remo\e.l from its plaee 1.111 :!!"'a\-S ke!,t e-imiilrt:- j!e;! v.-:;l-- (..-.■ .-.: .... It IS a.hisahle t.. keep it in duplicate, in pn.nnment !y marked jiositioiis in till- works. (■\A.\i[)i'; I'kACTici- AT i:l oRo II li-i T A. Kh KAKIi (Octot«r I). lIMXij A f.'u sratlcrrd Tint, , on H' On. null ui.t. I.r wunli iTi-cnlinK. Till- linli-, ,,t ilir i,.illrr\ irain. s air c(.ii|.l,i| l,v \v;i>licr>. tlifsc aro '■' '" III in I'lti,:.' and Iimmi •_>! !,, ;; ni uidr: ili,\- connect two l.nim •^'"' I'"''' 'Ik'h 'inn If mic -ct-^ louse, the (jtluT lioM^ ,, in -np aii'l ]ivr\cnt^ nio\ciiii'ni , The mii.lc-^ an inaiK at tin conipaiu 's lonn.lr\ . of cast iron; instead of Lem- ,erIlon,,l \MI1i IhiU^, the\- are one -ohd ,„ecc. Kach siainii ha-, its own -ni-le and a nL;hl-an-le jilaie, lo Keep it in lii-oper place and Imc, The wear is sli-lii and therefore the stamp work^ sniooihlv: there i-, less lieatin- than uitli wooden Kiii'les The mortar w a de\-elopmciil of the aiiMlddock, Tin- i- an fxcellent mode of const met ion . if properl\- done. I know of one tase- not m Mexico where tronhle was caused 1,\- tj,, ansil- M'xk l.em.; .onsirnclcd so that it did not rest perfectle true on the cement foundati.,n. t.i remed\- this it was the custom to shim the concnte block wuh a little cement; when this last hroke and crunil.lid, there was a movement of the nmrtar itself. At IdOro. tlu' niorlard.lock is made extra heavv. comhimn- to s, ,nie extent the an\-il in itself, with a l.ase three feet wide ami a !ioii,,ni 1 1? m. thick; this is j. laced npon a concrete foundation, with ,i ],ieee of f|iiarter inch rtd. her hell hetween. At l-d Oro, cones are suiierior to spitzkasten; the si/.m-^ tests haw i.rovi-d this ahundantlx", the separation l,v the cones l.eing mtuh sharjier. The circulation and a,-itation of slime are aitled h.\- six i)umiis which an' the Mutters modification of the C.wvnne pump, such as is ustd in tlie London dock-vards. Thev are of the i.entnfu,L;al tvpe; compressed air is introduced to etfect aeration of the solution. The chii f advanta-e of the Hutters moditication is that all wcarm.i,' parts are rea-hlv rem..\al.le. Each i^unip makes KHMU rev. per m.ci. and in that period handles Ak tons {'i\ tons heine solution 1 of slime. The \ats are all made <>f stei ! tjI:!!; ■; ■' -^ ^]-.-..'..- :,!,... with }-in, bottoms. Redwood laid down at El Oro comes to the ii i. II I2({ Rf':(f-:\ I I ] I \ //'/•, I'K \, 1 1( r sanu- cost, Imt tlio sti'il i> nii>rc durahlf ami maki-s a tij^'htrr vat in the rliiiiati' of iintral Mcxiro Tlif vat iIol-s nut ilrv if imptv, tlirn' arr no stavvs ti> clu'i'k. .iii'l iki alisorptiun of solution In tlu' prt'iijiiiation Iioum . tluri' is us.'d a dcviix' introiliuvil in.l.i«ncltntl\ l.v \V K. Hitty in Soutli Afri.a an.1 l.v Alt'r'd I' Mam at I-^l Oin . I refor to a ilr in. ihaiii Tlus,. are driei! I. ( tore heim; thrown into 1 hf nultiiT.^' ]i.)t. from whieh hars of 1.01)1) (,/:, art' cast. The .Me.\icaii workuu'ii are comiielled to remove tluir clothes aftei work, hefore passiiy^ to the outer room. Tlu- I'l-ecipitatioii niom has a cemmt tloor and tlie furnace lias a dust -cliainlier. ( r,i.\ //'/■. /'A' \( I /t /■ 1 / / /, ( I/O I II I. '7 Till- .li-\tli.].nic ni ..t niilliii'.: .it i;i Om niiphaMZi'S the ivla- tiw imjtortaiuf nt the ivannk anm x m tlii' ni(. iv- K""i'i'l. till ptitniiiiii Ml till- I'Xtraciion Liin^' clDsiMy ilfiiTiiiinrtl ti\ tlif liiu'tU'ss (it i tpitc i'(|ualit> in M/.r of particlrs; the Kiaiii-- III ^.-iiiil' air shavp as against those of a mml islime) rniilriv.l iiiipalpaMr l.\ al.M ii. i ,,i .harp nlwi.s, -S.-iiiir ho\v- '"•'■'■ 'I'l'. Ill'' '•'- "ell. u 111 Ir ■-liiiir' \M 11 imi iiliir at all; 11 pai k- liki kI'Iiv 'hi III,, niliir haml. 1,\ a'asim ol llie r, lati\il\- lav.;' i -iiria, ,■ lUX'seiiteil l.\ niimite i,arli,l,s. , heiiiu al ailimi mi ih,' pn.nnis metals is aliiiiisi iii-laiilaiunu- I!m\\ ne< essav\ r, ;^riii^linL; i->, was sln.uii 1,\ a -mipl,. rxp, run, n; iiiail,' l.\ .Mr S 11 I'earre. Saml. alter i.riliiiars e-.aiiuli i n-al iiieiii ai ihe ,,1,1 null, w luTe there is no le-.unniliii-. w a- 'IissmKi.I m ,,,^„,, nxii. liut ihe purple ■I Ca sills' ti..,t, wiiJ! -• i-moiis ihlor^K , ,ja\v m, prenpitate what- e\-er, the Uol.l l.eiiiL; effe, li\el\- 1,., k,'l will, in ihe ^'fains , ,t -ami. The assae ,,| ih, san.l -.ive S-\ :.[\ p, r mn. Hem-' the lu .,| Mr re-i;rin,lini;. The aeeiimpan\in- reennl of u-si-, will pr„\,. inniv-t i--- lu those en,L;ai,'e,l m ,\ani,le uurk. l.ookiiiL,' at Fi- 1 1 , it uiH !„ ""''■'1 'li''' l'i>' le^iinl explains ihe -raphu- repiT,, iil atmn ,,f two M/m- le.is, Al tile inn,- ,,| these test>, a _'tin , hu,k-l,l,i.-k was iiMil, hill It was t,,,, low to have nuieh I'fleet on the ■le-ree ol tlllelless of 111,, pp.iluil; .lunn:.,' the lesl the slaniI.-,li>,harL;e was as ilirouL;h L's nie>h, L'mler t]ie>e ,'on,iin,,ns the hiaij on till' tuhe-inills ami , .n the plant tiei'am,- too liea\\ . s,j ihai limT sen ens w,'iv sul.siiuii,.,l vli,,ri|\^ ath-rwanl. In the .lia^rain (taken troni the paper |i\ Ca.lani ami Murl. alre;i,l\ iiuntioneiii the onlinates represent the si/,- ,,t th,- >ereen an,l the aliseissae the 1 ereenla-e nlaniiil on > aeh i>f the -.ere,.,,^, he leueml TIh'o' _'."(! mesh" .Nhoniil n-a,l "thnmoh _'ltl) nie.-h." The use ot the icrin samhimlex. to he -een m Ihe noi,. appear- ■■■> ■■■■ ■'■•■■■ ■".;,^:"::.. r. .-jinr^ s , :\| .i.iiiai m 'ii. iaiiani aivi i'.urt t-mplov- it. anil it represents one of ih,. niosi valuahle features m Jfr'n"* r'-'-'-L-T— r vt-T"'" -c ,"^I ,[,. -y. ■■■I .■■■•■' 1 i -^ >-i— ;r.>'l ■. k '^ -.' c u ti. ( ).\.\i/'i-: I'Ku Til /■; .\r /■;/. oi<,u that the limTthc sand, till- iR'ttcr thi' rxti-a.tiun .ihtaimd Tli.rrfov,. ,i,^. niaxiimmi possible' rxtrartion ..n a sai,d of n^jvm composition ;> ,; niiiuhfr pn,p,>iii,>u.i! to its juuiirss. rousiJcirJ jrom an t\oiioii:i. .-tanj f^.u'iit. As at Kl OiM one ran ,; f^iiori , alrulatc t-xactlv ihi,' cxti-actK.n Ir-m a san.l wiirn ;i sizm- tc^t ha- l.rcn made, th.'ivfur,. ,,:,. ,-an caK-ulai.' thr m.lrx an-,itfd "•'^^"'^■•""■" 1""^, I'.r .Mr,u- ,,.r .xtrac- ''■''•i'<-''l- l"n. tiMii. t,,ii. t,,,n. roars,; San.l -i» j:i j:,.;: ,, „; ,-,'.^.j , ... .,.' ':,'"^- ^'""l- -'■' •'" --■■'■■'' - sil r.' 11 1 .-,7 l; Mi ■^l"i'^- >■' -'II :i,!»17 'I III ',:<. ,-,s _■ ,i:i sj j,; ''"'"■d l"il -^.T.iJ s so 7(i .-,(1 1 s,; .-,s .)(, Rlmakks. (11.1 null l.mll Pifori. ro-Kriii.liiiL; na- a.i,,pu-.l I'nu - iii.l pooriT than ...ars, In. ,ns,- u ...nlams less j;,,l,l ,,,„n t , at-a. k. .-SI, me richer in silver l.\ [.nsotaf ..l suh.ln.lr. Mill \. 1. J. i?;""' -' I- -■>-" ^ -;n m !U 1 a!i ,;:. ti ^''""' ">.SS 7.!t}!l 7 i;s ,.n of sinne. H.u.r .-Mra.H.m .,n slnne raises KeiiiT.i! r.Mili 1.. .1 satisfaetory hjiure. i:;n A7-.( /-."A"/ ( \- 1 Mill: l-RAi //( /, '111'- Ksprninza mill ha^l Il'o ^I,^nI,s wlnii tlir prr-ciit r.,m- paii\ i.H,k it .i\-rr. ill I'ini |i was .!fcni,-,| a.l\isahlr f. iiirrraM' the cai.arnv at i!r- lra>t |H,-.Mt,Ir rust, so i:, iluntin-tn,, „„1N (each of .Vft .liani.i, were a>M.-.i, with llu- i.lra ..f iv -riii.liiiL; l.c- foro cx-aiii.latiun This was trir.h lait \\ was ImuikI n.vrssary to plUfc tlU' HuminKtons alM.w th.- staiiip 1 .attrnrs. whi-h nr. rssj- tatcd dcvaiin.t; thr puli, It l,,in- ihnvhMv .hihrult t<. .hstriluitr the i.til). tn thr lluntin-tnn tiiilN. it was (malh^- ilr.i.h-.l tn use thr lattrr inai-iiincs tor lirst ,i;rin.linu. in ass.,, iaii. .n «jth. inst(a', of the pnnlu. t will pass _'()() mesh. 'M the i:. Ihintin.-lons. si.x are now used as nrst L;rinalers "" '''"'-.s'ne' -.ulphi.le ore. the pro.Kiet hem- sized and distributed to six WiKKy tal.les. the tailing; from whieli. afti'r elassiheat ion, passes down hlaiiket sjuiei's l.efore (inall\- reaehim,' the .■\-anide vats. The eoneentrate from the Wiltlevs and that waslu-.l from the l.lankets. i;oes to the smelter at A,i,masealientes. The othir nin.' Huntiiiijtons treat o.xidi/.ed ore, which, after iTin- .ground, -oes to tlie eyanide annex. The >,.st of steel and repairs to wearine parts amount to :i4 cvi;/,kv.v per ton: lal),,r avera.^.es 1 :, to 21) ,:■, per ton. The muller shells and die- nni,' an' made ..f roll steel nianufaetured hy flu- \Iidvale Steel ^" ■ "' i'hdadelphia This is a soft metal and is suseeptihle of lieiti- kept to shape: it ean i.e used until worn .nit, and is, there- tore, eioiiomieal Kaeh Muntin^rton mill ha>; its o^^■n motor: It h; proved itself to !.e the hest maehine for leduein.L; the ore to a eertain point say, tiO mesh l.evond whieh, h,r hner -rind- in.L;, it is not ee.inomii.il llie s,,nd undereoes treatmi'iit for 100 hr, for it is found that e.xtra.tion eeas.s then. Aeration is effe, ted l,v a peilorate.l pipe diseharL,'in,i,' .<\er the return-solution \a!: vet there is no sueh ios. ,,f Kt'\- as mi-ht ha\e lieeii expeeted. The former eol- lei'tniL; \ats are iiow used for treatment: ther.' is less aeration and less mixiiiL'. hut then- is ,-i ..i-,.:,t .r-,i„ ;„ t), , ; .■ .i... * »; C)'\.\/Ii/- I'KACIICh AT 1:1. iU<<> 11. l.il Iilant witlinut interftTcncr with cthHtixc ikti '.lat ii m A xaMiutn- imiiip, \nv \vitIi(lra',viiiL; thr cnnrlinl s,,iutinii. is ii>r,l onlv at tin- .lusr (.1 tlir M|.ci-alinii. S("]iuill . \-aili.lf, Xak'Cv. is tllr cluiliiral fiiilil'iy.'.l . it is L^uaraiitrcl cciual to I L'.">' , a(ti\-c K('\', rani^iiiL; In.m I'Jl to l_'s',. Thr mrifluil sokiti..!i, l.i-turc i.'Tii].itati , the hirad of thi ziiu -1 ...xis, s,,iiijtiinrs in 'Hiantitirs sutrnirnt tn krrji tiif scihiti.in up Xn standard st rrni,'! ii. 'Idler.' arr no anialted of "),L'MI tons ,,f shipping,' ore and IL'.IIDII tons ,,f niijlmj,' ore. Iiav- iiii,' to-etlier a \ahie of s7mi.;;s,", U, S uirrdiex-. The t'.xtraetion in the null was (11 (if , of t he ,<;old and .")■_'!'_", of t lie siher in the eriide ore. I ('<'!'i'i:i< ix ( \-.\\ii)i-: soLUTioxs Tlir liiilitor: Sir- .\s to c()])j),.r in ivain.i,- s.,luiiuns, (indm- facts luiv at vanaiuv with those i.uhhshrd in vuur issue of SpHiiilKr 1, I thought an ac-fount of our practice here wouM 1,r ,,f ,nt.rr-t as well as our manner of niakni:^' pure hulhrni fr-.m a zim-hnx produet hii,'h in eo])per. rile K"M-l'e:i--in-4 ore eunsists nf li, maiiie and elav m about e.in^' ..,■ deea.itaiiun. The latter is tlie method we e n!plu\-, nsiii- sliall'iw vats lit m, hi-ii, which settle cnipletelv in four hours, includm- the deeantatinn of the clear solution. Tlu' lo.. „, evan.de ,s about loi,-- pounds ,,er ton. with a solution contamiii- \\ lb. c\atnde. The znu-boxes. of ei-ht <'onipan inents each, sliow pure oopp.-r in the last two eonii.,-n-iments, and uraduallv turn black to- ward the head. The cppcr ,s not l.„.>e and .ponL,'v, but adh.eres '""'"''■■ •'"'' '" ;'" ^'IT'^i'-.itic.s l,„,ks like pure cpper shavm- ' •■'"' >•" lined to b,l,evc that, ,n this uiMane,. at least. cop,,er liclb- m the precipitation ,,f -old and sdvcr b.,'cause a copper tui'- on the zinc has ahvavs been .a pro,,f that the .utnp a.-savs onlv a trace in j^old. These copp.^nd ^havmy. when treated wilii -ulphurie acid, and ih.n cupcll,.d, vidd -..Id 1 ,(l(»() !„„■ ; so that the -unip mast be five fr..ni >ilver. We have found ,t necoarv o„ Put two occa-ions durin- the past two vears to divs-, ,1,,^ /,nc ,n ili,' b,.xcs and thcti the last comi.artments were no, coated wnh apprccable .•uiiouiits , ,f copj,er. We simple clean u], the tirM and part of the second compartments everv mnm],, „„i, .s prcxiouslv e,,],] ,i,„„, ],,^^ „, accumulated that it retards the proper H,,w of solution. The sh,,rt ziiu- IS not nmove.l. We tmd m this fact a (on- iradiction to manv authors who , lain, .]„,rt /uic t,, b,' m. rt. The fact that we can return short zme uuh n., accumulation ,,f Muh pro.luci, IS a pro.jf of its precipitatim; qualities, ()„lv what e:ui b.' w -...li,..! t 1, ou<(h a 2()-mesh sercct: ;,.:;>.,;. d ^^,u, a>id an.i ( i>l'l'l:l< l\ ( )-.\\/l)/-: >nLi T/i>\. 133 ina-- ""^ ''^f'""'' '""i "■'•a'.mrnl i. s<.paratr.l !,v stirriiiK in water l^'ranim.^' thr su^,,.,,,!,.! .Iniu- nnlil miiIv a ...avM- ,i;ranular !- l>lt Thr latifv 1, la-atr.l unl, siilphurir aii.l th,- tnrim.r ■nh liN'.ln,.hl.,nr arpl Thr sl,„„. rnntaiiis a lar-r pvrvvmu^c 'A ralrnnn rarlM,natr. \\1,k-1, fnrl.i.K tl„. „„■ ,,i sulpln.nr ar.,1 on account ui ,]„. ,v-ulu. that v.uuM Ih^ t..nnr.i ,-; nirlnn^ an.l on account ,.t a, and om- nitre The meltm,,. imi.t he .|Ulekl^ perfnnne.l to prevent formation of too much lead irom the action of the .yraplnte m the .rueihle, .n,l unles. eon^i.lerahle exp,-rie,uv 1.. ohtamed as to the proper time an.l Ilea', a tlux eonsislm,^' of eijual part, of t.ieavl,onate of so.ia and l.orax -lass would l,e saler. The um' of lithar-e, on account of its rapid shrinking before complete tiudtn,L;, allows of several hlhnKS l,c for,, fusion, Tiie Hux and char-e are mixed after welting sufficient tr. prevent dustm-. Th:c. smaller l.ars resultm- from different melts are now readv tor relmm^ a^ follow^ Place mside of Xo. 35 graphite eruchle a Hatfr-ea I' cruciMe so tiiat t lie Kotloms of each touch To accomplish this, the .L,'ra,.hitc crucihle must l,e sh^dulv clipped inside t..r al.out an inch fnuii the top, M,.], ,he hars m the elav crueiMe and then add, from tim. to time, a little mtiv until the metal i^ ...vered wnh sla.uc which should then he skimmed hv nicans .^i a small crucihle ilOevams- held with ton-s. Repeat the addm- of „,tre and >kimmin.^ until the skimmuiKs show '"" '•"!'• l'^"i and the hulhon looks hn^ht. On an averaKe, the hars which hch.re ret.nin- aiv 7(10 to MIO inie, vield hv ahove treatment hars of ,,\er ',I(MI tme. In case the soda Ihix is um.I, ah-.ut hve per <-em metallic lead should he. mehed with the har, as without lead the copper IS (htticuh to remove. The ivtinuiK' ,akes al.out an h,,ur after ""■'""- " ^''1 ""■ '"^'l'- are made, usn,..^ a elav crucihle diivt hulhon ,„ its,-, nne ,an he produc-cd m the .,riL;mal melt, using either luhat-e or soda (lux. However, a> I was not ahle to ohtain larijer elav eiucihles ,ha„ ,h,, l^attersea I' si/.e and as the heat must travel through two crue.hK.s, elaN hreakmu m duvcl eontaet with coke. I toiind it jircferahle to ivhne in one nv li. t"o).peropolis, Cal , Sept, 17 ZIXCDIST I'RI-:cn>IT.\TI().\ Thr |-:.lit.>r: Sir Attt !" naWiiiL; \'>iii- n ii!;n-ks idin mini,:,' znu--tT and ,L, lid. with (i\ri- .".(I' , ..f the \aluc in ,L;i.ld. The pr.'ciintatK.n plani cnsislrd ..t ihnc j.Vlon flat d.. .tlunicd W'xidtn tanks, a sixmihIi srlt-a;,T-pnnip. and Iw., U'.'.-tnii tiltcr-pi\ssf>. One "f thi' latUT was a John-tun prrs-, wnh s,x-,nrh franir-. The Icarh trnni sanil and slmu' ran. to a suiiip \\< ;-ini> it was pump, d tn onr oi \hv Ihvrv a,<;nati<.n \-ats. This prr-nant s.iliition was worth ahout ■^- piT ton. The (Diiiiirrssor was started and air putnprd 'hrouj,'ll a ^in. line to a .Lifalm,:; of half^nuh pip,- m thr hottoni .,f t h,- vat. 1 Ik'S.' hranrh pipis were perforated Two to tour jHniiid- of zine dust w-er<- a.: led lan a\vra'.:e of lir-, 1!,,. an.l the a,i.;ital!on with air e(.ntint;e.l ahout :went\- niimites. The el-iar;^'e -Aas th(ti punipci l\- means ,,»■ the tnplex plunder throu,-!] the pivs- One press lield ahoui one month's produet. In onler that the j.re.ss should nil eompK.ud\-. it was the eustoin to elose the di-ehar,ire-eoeks of the iranies m the lialf nearest the mlet, ,LM-aduall\- opennvj them a- the farther frami s Peeanie tilled, Tlie plant treatin- the ore produ.ed a product worth sl>() p,.r 11,,, while the plant treatin.t,' old tailin>,' from a former paii-amah^amalion mill made a ptveipitatc worth 8N per pound. riiis preeipitale was 'reated with -ul|.hune aeid. roasted in an iron niuflle and melted in pots. The zme .Just eoMs r,.5 to t;r per i,oun,l at the vork-. .\o att, nijit was ma'ie to rotnove the zme -i.xide \\ilh ammonia. The .iuantit\- of zme u^rA was ^"jverned h\ il-.e -.aiue oi the harreii solution. Sonieti'iie- iii in- crease .il zme ma.le a Letter preeipitatioti and at otlu r times an ineri'a.se m tha- str, n,i,'tli of solution u^v<\ on the ores attained the same result A tWent\--eent tad-sohition ie:w ,-, :,iii at.-.i ail .K.aMc.nal rlra!i-iii). winch c-.iiisisu-.l ot hanl lalnii- with haninuT '"•'' ''"■-'! Thi> .htfualtv r,,uM ],r ;.>■(„, 1,,1 \.v ha\Mi- .■.,iiual- t.nttMnu'.i \-ats. Atidnt JJ.', ton-, w.-rr pnnpitaH'.l in L'4 hMiir- Thi' jirt'ssi-s w.ml.l -lan.l a [.ivvsurr nf |ii Hi., ahii.,ii,-h it was the .iistM,]] t(i till ihr prrsM-s with a> Imw a piV'ssun- a> pu^iMi., pumpin- llif x.lutmn at a rair l.a;vl\^ -urrmrtii t., krcp up u;; h the plant. X" nakr.l tlainr sli-uM ),r al|..\\vii arnun.l tlu- pr, s> uliilc opriiiiiL;. an.l th.' ri-arft tc >ninkcr> imisl !.,■ kcj.t at a ilistamv. A tianir appln'.j ti; the cliar-r wln-n t hr pivs> w (irsi npriir.l wil! I'Xpln.lr tlu' lix.li-M-rn niixtuiv, s.-paratiiiL; ilit^ I'raiur-, ami scattiT- inj,' nitii] S(ini<- \rafs a.u'ii 1 wa- shuwn the plant at Mrrnir aiiW no sciTfl wasnia'ir ,.f thr tiirtlm,! ,,f prrnpuatn.n , an.l thr sain,' statniirnt ajiphus t(. thr attitmlr n{ those in chari,'.' at Lead, Snuih Makota. Mark. R. Lamm. ('■oMtirM. Neva. la. ScpiiiiitHT 4. !l OKI-: tri-:at.mi:.\t at tiik (( ).miji.\ati()\ mixi- (".('LDFIHLI). XKVADA U\ I'raM Is I, H,,„j|| (Oitclier li atvl 1:1 1!mh, I Ml 1 Al.l.l Kl,\ Thr (■(qnlaiiation mm,', situat.-.l ,ilM,ut ..nr-halt" iinlr nurth- ^■ast ni ,hv i..,yu ni (;.,Mii, !,l. ..n„.,.,s ,,t t-.i lull .lain,, an.l tlnvc traotinns, a^-n-aliii- .'CO anv.. Tl„- Mri.nial ,1i<.,,v,tv . .n Cuni- I'lnaticn ;^r• Ilu- ivprrM.ntatnv. m , ., , , |.;as,,.n. rxplMratinn ,.,m- '"■'""■"• "■•'"■ ••'!ti-r a \iMt tu,,n,-Mi t i„- . ,.,th-m- ,l,-i n. t.. liapprn,.! t- 1- pasMni,- tlm.u:^!, thr prr^mi mi.- mI ( i. ,l,li,d,l ,,n thr wav to '"■'■'I'^li: an.] thu^, at thr vrrv ui,t>rt ..i' it. raiv.^r a. a ■..,], 1 pn,- ■iiurr. thr C.tnhinatH.n wa> Mrssr,] !,v thr happirsi ^ar,„lrnt that ran hrtall a tninr ,t ,a^s,'.l ,ntn o ] i,;„„i, -n,,, ,,,, ,j„,,., ,. has sin.r .Mvn|„r.l a uni,|„r pla.r anmn- thr tinnr. .:| ,,,uthrni ^';''''"'''' '' ''■'- '"■'■" "'11 a.hnun.t.Tr.l; it ha> ha.l thr hrnrht ot thr 111..-,! appn.x-r.l aiul pfartiral tnnh.HK ,n tnini,,^ an. I nirt- ahur-y: an,] its drvrlopnirn, ha> imi hm, hatnprn.l ',\- .unk nianipulalinn.. Cnnsr.iurntl v, tlmuuii tlir ,n,,.t int.Tr.tin- pn.p- -■i-tv in tllr .listfirl. whrthrr wr r.,n-l.lrr it^Narir,] nirtaliui-iral prnMrins. .,r ,ts fati,, nf nntput tn -niall nnll-rapant v an.] .mall '''■^'■|';P"l<'"t, it IS tllr Irast a.lNrrtKr.l an,l thr Iras, ,hsrussr.l. I'll-' tii-st shipnirnts fnmi thr C mil.ination wnv tiia.lr in "'■'■>■'"'-'■■ l"l»-i Thr ;,fnss output ni tllr !„,nr ,n,m thr r,„r- nirnrrnirni n| , ,prrati..ns tn April I. P.KIC, is as l,,ll,,us ., '.'.llur T..\ii \':iliil- C va,n,lr,.rrr,r.itatc (11..). 7.;, ' -,-- r'-.uii *l.-'-'s, il l.!IU '^'^•< I'1-..prrty ',v-is a shipp, r t r. mi tlir -fass-f.,. .ts .Mninst anv i^t-a.lc. nf ,,rr r.,,,1,1 |„. sr-ivratr,] l,v vuuuh srivrniuL' an,) i)KI •: TI;2.-, to SlOOi in ^'rade.l .lumps until the completion .,f a mill. In shipping; it was at (irsl necessary to haul the ore to the railn.ad, a .iistance of «)() miles. The costs ,,l transportation an,! smelter treatment were so lii-h as to emphasi/.e the importance of treatment on the Kroun.I. and an investigation was at ,.nce commenced with a view to installing a reduction plant Th<> ore has l.een ,|escnl,ed as a h,-hlv >iliciHe(l dacite occur- ring; in zones of hssunn.i,. m the de, ,,mposc..i ,iacite c mstitutinf. the country HK-k. In the m<,rc shattered p,,rti.,ns ol the ore- l.ody the dacite is almost •■nlirelv altered into ,,uartz, with sthnK- ers an.l pat.dfs of kaolimzed mafnal Dunm: the progress of th.- preliminary tests, the ore sh(,wed certain freakish variations which made it .iitlicult to .hvide upon a metho.l of treatment. The fineness of the j^'oM, an.l the alm.,st entire absence ,,f con- centratahle mafrial in the u[,p.T le^•cls -idicatei drv-crushing. and a testing,' plant lor .Irv-crusnin- was installe.i. ' But even after a j.nij,' leachin.t; with .vanide .s.^kition. it was still f.mnd possible to pan an ap[)re.iahle .juantity of ^.,1.1 from the residue. Tliese tests had .scarcely he.tjun l.efor.' the i,'..l,l in the mine became coarser, an.l the pn, portion of sulphides increased. A series of ♦.ests by amali^'amation, concentration, and cvani.iation. gave li!ii.' will) (\aiii'lc Milutmn I'hc l.r-^t . ..II. lit mil, f. .r the -.aii.! wciv ImuilI I.. f..- .iwlit .lav-;' liMtlmi- with a dl" , ...hiMon, uliilr ilu- ■^luiu- iv,|,,,,v,l |,,ur limir-, "■"'' •' I" 1.".', s., Intl.. II 'n,,- i.,ll..\\inL; is a rrcor.l ,,t .xtr.Tti..n Irmii nIhiic A^suy h(Mn a small s.ale, iHtter ivsults u,re ..l,taine.l h\ .rushing' t.i .VI mesh, anil it 'Aas fmm.l tli.at li\^ slimine tl-.,. u Imle prcluct. a still lii.^h.M- ree'i\er\- miL,'lit !..■ ina.ie. lint the inpmxf.l etVi- ii of the develop ment of a lan^.e anioinit of sulphide ore at tli,' time eonstni. tion eommene.il on til.' mill, the installation was allowe.l to proeee.i. It was while the mill was luin.; l„iilt that larije shoots of sulfihide ore were opened up as the limit ot the oxidi'^ed Zone was reai lied, and hefore the end of the year an extensive dump ha.l aeeumui i'. d with an avera.u'e content of al.out :i oz e,,ld. This was reserved tor ^pee::;; i r( ;;;T7;. nr . aiei saiiipies laia. 7(1 r, , ahuDina. 17 0', . sulphur, 1 '_" , , iron. S ,-,'•; , anci ( (.pprr. Ira. c Dinrt >yatn.lf tivatinrnt was iri.'.l m all pra. tii al.lr vanalinns. I'Ut without ^'.'oil r( suits. After ^,'nn.liiij,' tlinuiuh -.'(Id niesh an.l au'itatini; I.", hr lu a Kl.'.'')', cyanide soluti<.n. the re. every was only 00',, with a 1 11. cyaniile constinipti'.n. K'lastmi,' an. I lea. hin.i,' a L'O-iiiesli pn.du. t k-'iv.' an , xira.tion of !•!' , , with a 7 _'ll., evaniile eoiisumpti.m Roasting a 20 ni.sh pr.Mlu.t. re--rin.linu f. I'dO-rnesh, an.i ,ya- ni.lniK' l.y agitation in a l'.",' , solution '^ave \y.\' , extraetion. Pan amal^'amation ..f the n.aste.l ..re ^;ave an extraeti.m uf ")4 per cent. Oil eoneentratL.n il':iniore proeess) of raw ore, with a.uitati'.n of tailing; in .yani.le s.,luti..n, i,'ave !l()' , extraetion with a e'.nsuinp- tion of 7i It.. e\anin of l-jilorine produce.! l.y hrinyinj,' t.. -ether an O.S' , sulphurie ,„i.i s..luti..n. and a 0.7' ; chlori.ie of l,„,e solution, an.i leaehini; ;<(> hr,, Kav, a recoverv of 40 per emt. Chlorination l.v the t.arn 1 prot.'ss. after four h.nirs' treatment, V'ielde.i 7.S j)er eent . These various nietho.ls were tri-.i Infore wet coneentration because the aim was t<, treat all pr,,.lu,ts <;n the groun.l and avoi.f shipping. A comhinati.m oi eoneentratin^ an.i eyanidinK. howt ver. was ultimatelv considered the most suitable to C.ol.ltield condi- tions, anil was adopted. The ordinary concentration of. ■50,. r 40- mesh pro.luct was f.uni.l inefTective. It did not make a close savinK "l the tine sulphide, which ha.l t.. he renu.vcd on accunt ..f the poor cyanide recovery from the raw sulphide. It was mcessarv to evolve some closer method of recoverv which woul.l leave nothing' for cyanide treat- '■"""■''■■■ '■■'■'■■ •"■^■'•' panicics tiidi inij^hi elude the most efficient concentratinK machinery. The onls- wax to a<-complish this was 1 to RF.( i:.\ I I \ \ MDh /7vM( //( /■. l)V a sfriis i,( r. .lu.tK.ns. nml hv luHoWiii),' t.u], srnyy ],\ ap[.ni- priatc innrtnlnuiMn. T\\r Milj^hnlc tn .d at t m h siaKc i.f j^'rindinj,' wa-^ at (.ncv nni.ui.l 1h tur.- tiir mv j.a^s. i| t.. I lie m xt arui liner ^ta,l,'l• mC i;rni,|ini;, an.l ihu- an ur)ni(issar\ < oiiiiiiinulion was a\ipiiliil The |(ill.,\\ini; tmll ii m tnnii-, the l.as.s of the uu thod a<|.)pt.(l inpra.ti,, The ore. assayiiii; :i (II .,/ i;.,l.l ua^ (nislud in stamps to :i() iiK ~li and j)ass«'(l over a Miiall \Vdllr\ t utii i ntrator. Tins vi'ldrd (i' ; il,\ \vi ii^'ht I ut ( iiinvniratc. a^sa\ iiij,' 27 4 <>■/. j^Mild. T!ir lailniK was n ,i,'n)nnd tliruiii^h (id tiK sh. and n -< onci nt rat< d, vuMm- _' 1 I' , r.iiuvntratr, assaviriK l'.t.s,,z i,.(,ld Tlic (iO-i: sli tailing was n -i^round tlimuKli IIMI ni,-li and ...nn nt rat.d, yi( Id- ini: 1'; .uncinratr. assaMn^' L'(t -I m .^n\,\ The n si due was then t;r..und lu Jdd ni( sh. and pa-Md n\, r a ran\as tal.lf. vuldniK 10'; Ml sdnmus cnnicntratr, assa\in)^ ;{,!I7 (,/. i;(j1,1 The fnial ladnu: tn.ni \hr n\,nvr up, ,;,!■,.. n a-sav, .1 "l' .,?.. k(.I<1, sliowin^' an.xiraitinn hv .oiuvnt rat mn .,t SO' , 'l'h(^ extraction by canvas alone was I.'i' , , -howiin,- the marked adaptalnlitv of canvas to or- ,'ed cvani.iation. T UK MILL In con.siilerin.i,' a mill f.ir the c.imbinati.m mine, it was thought that the size of the proixrty would hardly justify the initial in- stallation of more than 10 stamps. The plant, as completed, is unusually lar^'c for such .small capacity. An extensive and ' 'A'/-. / A7' I / .;//■. \ / 1 / ////,,, ,Miii s \i,, , Y ^// y/. It o.stU ,.,„,,, nun. was nK.!,- n, , , s.arv 1,.- tlu' ..lahnnn,- procfss '■''''"'"■•■'' ""■'l"'''-t '■-"^•■'^. an.ll.vth,, l.T.smn ,„,!„■ ,nana^'.- ""■"' '" '■'■^'■'■'"- ""■''•"■• "' ""• nnll I,,r th,. ,,•,,.,„,.„, „1 cu>tun> '";■ , ","■ '■'""■ '--'I. nn.l ,,„,. run,,,|,„ an.ls,.,,aratrun,t.tl,u.ll,. ,'"'", '''^"" ^^''^ ^l"'"'"' "^'■■- ^' ^'''■^^^-'- an a than w,,ul,| oiIutwm. '•'V '"•■""'"'"'""' ■'■'"'"""•'V.I-u ^... l,asl„..„am,,h ,ust.- '"■'' ''' ""■ '''^"-'^'n'^ "f il„. nlarh,n.■r^. an-l i !„■ In^'h ncvrrv I'lilaitii i| ''','"' '^"'^ "' •■^'''"''' '"•■ '"''l^'lr intn„iu,v,i srvrral ,.n,l,|,.„,s ">'" '!"■ ..,„.,n,>,„,n uln.l, havr n.n ssanlv all, c tr.l t hr ,.,s( of "•'■■"""■'"• "^""•''^■■""■''-•vat,nj,ut..,v .tlu. I„n.. an.llh. .l.vat- '"f "I '■"''' '■■ '''•'-'.<>-. TlK. uai,. pn,l,K.,n, lunv.v,,- uas 7''''' •" ""■ ^'■"■'- ''"'"■ ^vatrr ,s .,l.la,n,-,i tn.n, s,,n„..-, . ludr.l ^' ■''>■'''■•> ;>"!- '.v-t uMh. m,m., an. 1 ,s ,.um,K,l ,., ,|„. „nll a^ainM ^''H-.l,„a!„nns()„n,a,ao.,„r„,,,..,,,,.^,, h ,s h,„ as „ , .nnes t" tlu' surtar,. and .arn.s al.uut 1', so.lu.m sulphatr an.l a tra.v •■'s.,l,unnl,|„n,l.. Tl>uu,h .I,,!,,,,- l.ra.k.sl,. .h. ua.rr ,s p,„ahl.. an.l h.r millin.,' purp„s..s ,1„. sn,!,un, sulplui.r ,s 1,. rutiaal ,n ass.s,- ini; tin- sett lenient of the slinic. Tlu; ".■>' IS tfatntne.l „•„», the shaft to stura^r htns, f.vttt ulnch >t .s ,l..l,xvre,i t., a pla.furn, al.ove a M) l.v U; Sturtevant roll. , aw cTuslKT. ul etv u IS .nt.x.Ml with the require,! amount of l,n,e varv- ■"K ron,.,to|..ll, perton. Th.^ rusher , ..hues , he ore to'al.out om-halt meh size. The laek of fall n,a,le the interposition of a sortin.^n.zlv ,n,poss,l,Ie. KvervthmK P-.-es to the eruslu r ami IS de ivere.l diree, to a iL'-m. helt-eon vevor s.., at an an.de of - ) . w huh ele^•a,es the ore to the mill-hins. There are four of thes.. hins tor the four units of Hve stamps eaeh. (Ten more stamps have reeentlv heen a.l.le,] for treatin., sulphide ore) The point of disehar^c at the top of the mill is shifted hv means of he usual forni of adjustable earna,e. The ore ,s fe.l irom hanKin^ feeders, attaehe.i to the bins, inte, the low mortars of the Boss cantilever Lattery svstem. This tvpe o^ batterv frame and mor' z:v^''' '" "" '""^'^ ^^" '^"^^"^'^- '^^'^' "^ ^^^^- ftr t I",."'' '"°''"^""^' l-: /'/\.1( 7/(7:. has been n ceivc d ; and recent favorable dexclopments in the mine ha\e (Ueideil tlie inana,i;i nu nt to devote the entire mill to tht'ir own ore. In the followini,' aeeminl. a eomiilele ti\-e-stamii svstem will lir eonsiilind. The selu nir of trealnunl is ixhibited diai.'ra- matuall\- in I'iu'. 1-. Inside aiiiali,'a!nali(in is earritil mi b\ means of a c'urved plate sen wi d to the iluick-bloi ':. 'I'he on- is erushed tliron,i,di /t?- 'J5J.0 >'4.*'^ r:;;) '/ r" i*«^ $>rrir*r 31' I'iK I- TriMliiunt nt ( InicIuucI ( Iro. I'J-nn sh wire-siRtn. Outside the sireen a splash-jilate is used. I'roin this plate th<> pulji falls to a lip-]ilate about 12 in wide, with the front idije slieluly bent down. Kivin^ 'he pul]) a ^'entle drop to the apronplati. There are three plates to ea(di mf)rta,-. arranged in stips. K'ixiii.i,' an amali,'aniatinj^ surface ");j in. wide and about \'1\ ft. lon^. Till' whole tray. b\- means of wheels and track, can be shifted during' the elean-iip of tlu' batlerv, as shown in ]■ 1J4, i.'i ami W. ' 'AV'.- 7A7-;. 1 T.M/-:xr . 1 7 y //./, , , )mh/\. 1 rn >x .u/.v/-;, 1 4:^ At the 1m„,,,„i of.ach tfavisasnialKunrln.lrauHc classifier wliKh s..,,arai..s the rears,. m.ll^,,„l,, int., t uo ,„•„ lurts: (|, Fine sand an.! shnu', whirl, passes to ,1,.. „utM- dtsrhat-o l,p „t the Brvan nnll and thc^ncv .Hrerl to the mnrentratufs, ,:>', ,.„arse sand whuh j.asMs to the Bivan null f.,,- iv-.,'nndini,'. __T1k. nre, hetnu' exttvtnelv hard and twui^d,. ,s efushed w,th 1 ■•vO 11'. statn,,,., lalhnK H'O tinrs per tnnu.t.v u- h a (Vin. drop In spite ot this, hou-ever, the stainp-dutv is onlv ;U tons usin- a l>- mesh sereen. One of the ."-ft. ^rvan nitlLs, running at half";pee,l, takes all the coarse san.l. trotn lOslanips (approximatelv 20tons -jer ,'a!natic)n TahU.. to 40 mesh. The final product from the Hrvan ,s pass .1 over two t,-tt. I- rue vanners and two C-ft. Triumph tables. From thes- •■"•urntrators the pulp ,s raised hv two A|,n. Frem.er san.i-pumps "> tw" sets of cone classifiers. Tins svstcm is a mod,fi..ation of ;';=" "itrodueed l.v .Mr. Merrill at the Homcstake cvan.dc plants 1 hr top eone takes the mternntten, d.scharue fnuu the sand-pump and ,s so adjusted hv valves that >t sends a fairlv uniform flow of pulp to the tv.sm.aller cones. The top cone is not a ' h .s.fier 111.' hrs, rouKi, classdiea.ion ,s made m the small hvdrauhc -mes. from whuh a stream of sand flows direct to the san,i X'atS. 1 he overlliive fr,>,.i t 1, n and fme sand. Hows s, the lar,..- lower cone, where a closer cdas- ^r^ ^ X: ^ H: ■1 , ~1: ORE TKEA TMEXT A T THE COMBIXA TIOX MfXE. 145 ^^ificat.on KS ma.le. The stream from the bottom of th. latter also flows to the leaehms,^ vats. The overflow from this lar^'e lower cone jiasses to the slime settlers. The pulp from th. I5rvan mill mav, therefore, be said to eon- -sist of two products, namely: Retained on !()() mesh 4|f^, l 1. Sand '. Passin^r 100. retained on .'00 ;r/ ' ' (17', of total Fassin>,''_>OOmesh . . . . y^r - ^'""^■■■■l^ass,n« 200 mesh ^ ^ ^ ' ^ ^ iioV .:«', of total. This IS not eon.siderelilllc is liclnrlTil IM till,- irntR' of a i-Miiiral-l >itl(jni SfttltT. l-roMdi.l with a run ci\ir!!()\\\ Tlit rr art' two (if llicsc sctth rs Mil carh ^iilr cf thr null. ICaili is allrnialcl\- allowrd tu till and nvrrti. w hieh has a lift (jf about 10, ft., is run at .'i".' rev. ptr mill. Thus, at short intervals, the wiiole content of the vat ])assts throu.L,di the pump, where it is aerated li\- means of a i)et-cock on the suction ])ipe. The stirrer prevents the s. ttle- nient ot tine sand at the junction of the cone liottoni witii the staves, and k(.<.i)s up the ai;itatiun during pump repairs. The only ripair re(|uircr or breaking. Moreover, the operation of pressing, w;ishini.'. and di.sch.-ir-.'ing OKI: I i.\iHfx.\r/().\ m/xh. 14: was cxtn'm-lv slow, r>'quirin,!,' al.out tivr h,nirs, an-l ihv oprratniK ^■xpfnsr Inj^'li, n'.jinnn- tw,. mm .m cad, of tlu- ihroc shifts at tlu. ,,n.va,hn,^. lalnrnT's wa^o of S4 ,..,- dav, to sav iKnlnn- of the cost ot the filtrr-cloths. It is fair to suppose that one of the h.«h- dass t,>,vi-n pn.sscs of the Ddine tvpe m.^ht have ^iven hetUT sat.start.on. At Ivst , h.nvever. filter-,,nss,n- is not to hv com- pared with he system now in use, esfxeiallv as re-anis eost of operating', and tlie completeness of the wasliin.i: ojh rati.,n. Tlie essential jiomts o,' ditYeivncc hetween the Ikitters-moditi- eat.on ot the Cassel (ilter and the other vaeuum-tiltenn^r schemes are the extreme simplicity in the desi.i^n of th,' tilter-leaf or fram ■ and the lact that these frames, throughout the (ij.cration, are al- wa\s staiionarv. In the Comhination i.lant tiure are 2n fram 'S <•' ''v 10 tt.i set 41 ,n. apart in a hox 10 ft. s(iuare with a i„jinted l"-l""" "Ul.ned at an an^le of ."O". The slime-pulp ,s intro.luced '" "'-■ I"'i"l "' the ',ox. and a vacuum of l'J m. „f mcvurv ,s "'■'•"•^""'■•1 tor al.ou, L'O mm, durin.^r whuh tune a cake ,s deposifd on each si.le m , he Iramc. ,' t,, 1 in. thick. The surplus pulp ,s then withdrawn to tlie slime reservoir an.l the wash introduced, consiMin- oi a weak solution of cvanidc. Wlun the .-'•..s are' th"rou^L,'hlv wa.hed. the weak s,,luI,on ,, ^^■ithdrawn into it's proper vat. an.l watM- mtro lueed, tmiil t he frames are eompleldv im- nicrsed. Tlu. ol.j.H-! of this tnial water ,s to assi.t in removing ilu^ cakes. Mor,> water is introdn.cd mtothe interior of the fraiifs ""'1>''- a low head. This causes the '"'-1 '"'ttom of the tllterd.ox, whence tluv are imallv remov.d l,v sluicin-. The wliok^ operation re,|u,re> about ;{J liour>. and al.oul nine tons idrv, slim, are treatcl ,it each cliaixv. die plain, therefore, has a capacity of ahout tiH tons per din- It is operand hy one ni;m on each shift. The principal power '■'■•jnind IS tor pumpm- the pulj, and the vare.e^ M.hilions m ■"^'> '"" "• 'l><. hltcrd.ox, and for ope,at.n,,r the vacuum pump In additi.m, the ,i;,.l,l-l,ear,n,- s,.lution discl,ai-ed from the vacuum pump is raised ahout Hi) f. , and forccl throuL^l, the disear.led tilter-press n.,w u.ed f,.r danlVin- purposes. The ^^■hnU^ consumes ah.nil 10 h.p A |,-,-n p, motor h.-,. Icvn metalled for tin, work but has extra work to do not connected immediatelv with liiUTinK.' Th.. hlter-plant has rcpiircl no repairs sin.v it was f^rsl operate.! in Febniarx of this v.^ar, and has w.,rke.l m the most sntis- I.*ci.,ry manner. l ne cost ot tillermg (ex.-lusivc of power) has •' m US A'A'c/.-.vy (Yw/ni-: /'/< \( ik /■:. lidii rciluM .1 fmin !iCk . per t.m nf slmir in Jamiarv (usins,' tiltcr- prcssi 1(1 •_'»'.(■ Ill Ma\ di-iii;^' the Kuttrrs ^\sictii . The ]i(i\\vr lonsiimi.tK.ii apiuar-, \n l,c al.<.iil llu- saiiir m llic tun prncrsscs. Tn\tt)ihtit ,'/ Sulphide (>>,-. This ore is i-nislu.l lo !_' iiusli. Ill t\vi] ti\r-stain[. liatt(i-i(>. ami run dviv platrs tn takr up the small quaiititN- nf fnr.^(,],l pi\ Miit Sir I'li,'. 1". A i lassititr at tile mil (.f Ihr ]'latc-tniy miK.xts the rnarsf saml an.l ■.ulplu.ir. wliiili u" III a \\'illlr\- ri.iiii iiiratdr: the (iarsr sulj.liidr frmn lln' pni.juct nl' tin "^taiiip- .nisliiiiL: I., l.'ni.sh. Tlir lailiil'4 iVnni ihr WiUlrV is raisti! m a lnu l-ct -clr vatnr tn a lir\ an null, wliuli .rii-lK s it in 4(1 iii.-h (Xn II -Initcl Mivmi. Thf tailm- fmni ilir lirxaii ^J —1 4«** »^'* ■■ •^aiis '^S^f ' -J IJ :i,^ *- at i- . # k *V'*>j . -,,;. !."> 'I'n ainu i.l . I >, null inin> tlir sin am nl" slimc I'mni tlir small ila--siti,.r an^l pa-.M s In l.iuf (i-tt . l-"fur \aiiiur-. lit IT a lar-c <|uanliP nt hnc sulplmU' is riiiin\i,l. Tilt' l-"nif tailiiiL; is ilun tlt'.ali'l li\- a sand-pump In a ( lassitu r ^l-nM a 4 \ \ 12 ft, AMm' tulif-mill i<\ th,- inmnmn t>'pf. 'I'lif fniic atts as a tlassitu r as will as a dt-w att niiu;- df- \-iff. Thf cnarsf sanA'/-. TIMH/\. 1 / /, ,,\ MIX/-: 1 If. short run the results uvr. v. rv ,,r.,m,M„,. (), ,1k- In.al ,,r,.,lu,t fn.m th,. slnm-tal.l., s7' , ,,ass.,i th,.,,,,,, ..(Ml „„ sh. an.l ,!„• thnv stairs of n.k,.„„„ .,,„,,.,, ,, ,,,,,„^ ,,,^ . „na „, nu „.„'^, ,f ..v.r W , ot thr ,onta,m.l ^oM. Wuh tlu- > va„„i. ,r.a>„um of th. Mim- tanm^:, a ronf,nnati,m ot , lu- small nnll-run ,s cKurnr<] namclv. Ix-ttrr than !I0' , nco\i rv. It ,s ,oo soon to ^nv tl,r n suits ,,f tul.c-tmll w,,rk, Th, nnll 's hm., w„h _'i-,n, s,kx M.Kks. u huh w,ll 1,. r.,.la.,,l l,v hlo.ks 4 in, thick. l-'.ir. Hi Tii!r-.\!,1I .:;>,I WillKy Shiiu-'n,! ,!t s. Inn,,„alion is a.onnphslu ,i ,n th. usual wav l,v m.ans of 7AU. shavniK. Th. solutions ar. ndu r than an. usuallv scvn ,n cyani.l.. mills, nadnn, as h„h as on. oun.v p. r ,„„„, ,„1,1 Owtn^.o th.. al,s,.n,v .,rs,lu:-, uh,d. un,h,ul„.,iiv ,aol,tat.:thc prccip.ia.ion ot ,..1,1, a v, fv lar,v .,„. surfa.. is n ,|u,r.,l Tli. prcopitat. ts re.in.,! w.th sulphur,. a.„i an,i s,„.l,..l „, ^ „oi- tuma.., with Kasohnc'. a pow. rlul i.t l,.,n.' m,-„n,a.n,..l : „_ . oi a small upn,i,'ht L.vn.r .omp,vs.sor. "^ ^^fl 150 /\7-.( /-.A / ( r.l.V//;/-, /7\M( //( The fdllowii il('tail'< of rost^ for millinj,' ami c din k' ifi- iluati' a few of the ,' furnished \iv a local c\- introlucin^,' a new fih( rini,' s\stein for slime. The marked dicreasc in opera- ting,' exp( nsc during Fehruary was ilue to increasing.; the capacity oi iiie mui l.y annexin,^' i() stamps, maix .u/.w., i .-,1 "»' ""al . 11,11, nv; an,l rv;u,„!,n,; , ust nf s'siis ,„ ,■ i,,„ ,,,.„„ |„„,, ir ,s rcalh nut m, u Ik n lural , ,.,„lili,,ns a,v o.nsi.kTc.i iT.s .^xpcrtr.i that furtlR.,- tT,,-,n,l,„u.nt u-,n s,„,n mt tl„. ,ioun to ■'*•» pc ,- tdll. Thr ,vr,,v.fv in tl,r n„l| an,l rvan,.i, plant lias attatn.Ml a niaxumun .,t 'Xi' , f,,,- s,.v, ral >„nM .utiv, „„,ntli.. an.I lias av,.,-auod <>\vv itO jur ( , tit !fi ' 1' T..U1 roft . f H'irr rhPTntrnts hih \n,i (V'.mIi' T.ital I:,!, iVjttrr> ^liIn(■■^llt4•^ T.iilinR iliiiii FlIliT |irr.s ^ .Nllutinn IlllMl . On- ti, t- 3 "♦ £ t- -S £ 'T^ V 5 i' 3 o — i oooo " TmuI ''(•(nT:il I xtn-rw oo O .1 M;iirit*T;irir ;^ :iii.| So o rfpjur-, oo I, " I-l|{^llTlK. 23= — ^ oooo© t^ -i ;;?5- P - l-uhrniititiK Riipiili'ii i.«Ih Suj.|.li.s l,al...r ooo o o oo o oo — ooo — * OOOOO zj -13)-. — -r ^ . ' SupplwH roS-r^^ - :^ (\:irM(|inK. , OOOOO ^ - isss^ i C <'"li"r'tr;itiiiK SupiJllR ocoo I V. :ii.i:.Uai„:.linK. ,,.|„,r "7 '% ^ - •r J 55 r3 "c ^ o565 rt .. '>iJ>liinK and •-leva inR lO r^ f -^T i OOOOO i \\;it4'r ;in(l |iiiiii|>i[iK . C li.iilmg C4 CO A e-4 oo I 0<0«i-w> I m ■CnrOf«C>4 1 ^ **J <*3 f^ to OOOOO I Rpssa I OOO — o I T* gc a» «n e-« I OOOOO §Or-»^- o5o ' oooo a<5 — ri^ OOOOO I OOOOO ' t-«c»c o -o I o eo CO -r c i I 0000& I OOOOO sissi • OOOOO j *". f-'^Cft* M |^* ?i eo CO I OOOOO I »0«0'r^ «o _• OOOOO omo3« I ?^»-. — — o »« -^ CO CO c- ( I OOOOO I '^* *" "S »— >^ ' io -r CiifoCO ' OOOOO I OOOOO ! ^oooo ' IPS . . .i 9 I ' — ;l ■^ ' 'C Mill ■MHTinu-Mliiit , OOOOO - "• Or,. ,„ns. 3g^SS tOOl ^-(-- to ' I »- — CO OD r^ 1 I — — -lOO • go q_e o O O O to kO '■C O O ut u? = rr.j iiS^^: II si. mill FILTER MACHINES Thr Editor: Sir In view of thf scarcity of htiTatun' touching ihv Moore ;in(l Butters pr.nt s.scs, some comment on Mr. R. (Oilman Brown's recent papers may he of interest. The process at Bo(he differs from that at Telluride (as dt scriht-d in 77i<-/-.n^';mvr/>n; and M iunt^ Journal, ^uly 7, litOGi in a notable point, the cak" heinj; lilown off hy air mto a hoj)per instead of by- water mto the wash-vat. The latter method is liistinctlv advan- taKef)us as the strain on the tihers is considerable, while air cjuickly enlar^'cs leaks. Further, a stoppa>,'e of a few iiiinutts cau.sed, for examjile, by a circuit-breaker bein),' thrown out, will cause a con- siderable j)()rtion of the cake to drop into the wash-vat, which is both inconvenient and expensive, unless the vat is designed for pulp discharge. The photograph given by Mr. Brown shows that the baskets are likely to hang so unevenly that to use water, the basket being hung up, would consume much time or give a faulty discharge at the high end. The discharge of cake by water when the basket is immersed, is perfect, while discharge by air entails scraping at the edges. A great disadvantage of moving baskets is that an accident to the somewhat complex moving gear l)uts more than one basket out of commission, while, if the pulleys of the hoisting chains wear far, there is a chance of an awkward accident thnjugh a chain slipping one or more links. The ability to rai.se the baskets, however, facilitates replacing leak filters. In the Butters process it is to be expected that the unmoved filters will outlast those raised and air-distended; but l)esidcs this we ha\e an econom>- in labor. To raise and discharge a basket takes half an hour and the basket-man's whole attention, while in the Butters process his duty is mainly to turn the valves. With the charging and washing intervals given by Mr. Brown, two bas- kets would keep a man busy, while he would be badlv ovi-rworked with quick charges Hke those obtained by Mr. Lamb on Goldfield ■ore. r^ . Bisbee, Arizona, September 7. WHAT IS sli.mk; Tllr K.litnr: Sir Slinic is i:nu nrciMni; m, mu, I, ^,it,nti..„ arnl is s,, ,,,n -pulsus a t.atur,' m nw iRatnui.t lliat tlinv >, , ,,,, ,,, l„. ■, i,n,u- nil; .lisj„,s,ti..n t., .1, siLjiiaii sonu measure .,1 nii.ii, ss u hi. li .sl:all ilitiiic il ari'l rm. i\c i,'rnrral mnLjiiitiiui We kiK.u- shiiir II. ,u- as a i.mditi(,n of pulp ,hat n.|iiir.s an.iitiun nm,-,. .,r 1, s> n 4KCv . JAu • f) ■ up JKAuCy, • .'KOII Ivxperiiiieiits are 'lescriljeil which l:<) tn sh'iw (|i that free that anv assis. tanec '^\\vn \>y free cixvi,'en is nl a seeumlarv iiatun', and i.Ji th i free nx\i;i-n cxirts a retarding; inlhietire 'I'he exiieriiiienls show that tile L;al\ annnu ter •-■iiits tn tht- Jjresence of fre( ox\L;ell as ha\ iiii,' a retar.hilL; iiitlueiue (in the dissolution of the i,'old, whereas the lialan(e points t., u Ijeini,' r)f niatenai assistanee The eause of tlie two inslnmu iit ■, not ai,'ree- int; is discussed, anil is attributed to the iMrmalion of l.xal \oltaic circuits Tliese. in the tirst instance, deposit hvdroueti and oxv- ,1,'en, \\hi( h it nia\- lie assumed, lieconie (jccludeil a; their respec- tive electrodes until the system-, are in c'|uihhriuiii It is pointed out that the cyanogen lea\es tlu s,,lutinn tii oml.ine with the K'oM ratlier than that 1,'oM particles pass into the si.Kuinn. and It IS shown that cyanoi,en docs not lea\e the Solution until the dcjiosited nxy^cn lia- l.een occlude./■>« I j,.,.fi.i(,,.„AV,'.;'r(. iT.piir.-,! by thp uuthor ,in.l puMishcd in the A7-;(7-;.vy < r.i.v//;/-; i'R,\crich.. -Iqiositrd, [■rem tliis it niav \,v r.nijcctuml tiiat no nirtal at'tuallv cnmh.m's with oyancjjen until the s(,luti..n has a certain mini- iniiin stri'njjth. Tiu' prrscm..' (,f (iissolvci oxygen in the sohition lias a soc- on.iary cllivt in thf process „f .liss<,l«tiu(y .l,.solvin:,r „i ,iie p.itassuim .yani.le s.,luti.ni. as one salt .Ii-s.i|\,'s 111 til.' solution of an.ither. Th.' .Tf.vt ,,f the uas cell is best ol.servc.l in hi-hlv .lihif s.luti.ins at ordinary or 1..W temperatures. Ai<- r a certain strength IS attame.l, .Icpen.ient on t. nip.crature, the effect ..f th.' ^as cell IS entirely masked. Al the hi.;h,T t.'m,K.ratur.s the F.M.F ..f the pas cell .liminishes, with a .•orivsp.ni.lin..,' incrcas.^ in the F -V I-. ..f the Au-AuCv .ouplc At !..„lin- pomt the ivtanlin^' oxy^,'en elhrt ..! th,. ^as .vll on tlu' .lis..,Uui..n .,f tlu' m.-fal prac- t'cally dis.-.jiears. SOME TAILIXG SAMPLERS Bv R. Oilman- Brown- NMVcr.il.(T .( lllOI'ii It is hardly too much to say that of taii-'riK samplers there should he no enci. ami the description of go(jd devices of this class at least serves the laudable end of removing,' the underijinning -*:■» -TT i/i , I fi . . . ^i-rff "f"" \ =-1.^ n — ij_- 'S— i^r Fig IS. Tiiihnj,' ^aini)iiT in I'so at the Yni-r Mill, W. C. from those who still evade the use of such devices. It can not but be remarkable that, even at this late dav when so much ha.^ 15S Ri-'.cKxr ( )\\.\ii)i: /'v i( T/( I-:, tu'cn urittiTi (if the m-r<\ ni a -iyst.-iiiatir vhvck on iiiillini,' work. It shouM lu' ralluT the rxcfption to find autoinatii- sain[)UTs in- stalli'il in sinalk'T mills. It is not the I'ViTN (lay iiuTlianic who can devise a maehine wlneh at re,t,'ular intervals ean he .;elf-i:isti'^'ate.l to take a quiek eut through a stream of tailin-. and many of the de\ iees fur- nished l,y mamifaeturers are open to ol.je( tion on the s.-ore of hii;h eost. limited ;idaj.taliilit w and eoniiilieate.i meehanism. The two illustrated herewith are i)raetieal maehines. whieh have hei'n installed l.v home taleiii and have stond the test of l,,ni,' operation. The lirst, illustrated in I'il;. I. 2. and :•!, samples the tailinj,' from the Ynur mill, m Uritish Columhia, Jt ean lie deserihed as lollows: .1 is a \ertieal ehute down whieh the tailini; flows. /> IS a sanii)hn- l.ox with ' ,,,-in. sl,,t suspemled liv the han.;ers ./ J. whi( h ari' free to swin- Im-oiii the spout of I) the sample runs into the reeeptaele /;. the apron .1/ i^^uiards a-ainst splash, and ( . with its inclined eo\ vr, further proicts the sample from acvidental saltin- When the sampler is in the positi.m shown, the tailin- MR'am falls into the hopprr /\' The aetuatm- devue IS shown at the ri'dit o| |-i-, 1, /•' is a w.ater pij.e with a re-ulat- m- \alve. /•. is a water ean seeured this .Icvi,,' D take samples in.ni l.v,' minute int. 'reals up t.. :i(l. H an.l /•.' are tin ..nlin.arv •"■;-•''- '"•'! "il .ans .It .■.iniini'i-ce. it siioiiM he u.ite.ltliat m li.t; ■'! tile .utu.itin- .l,\in' has hen ..mitte.l. ,in.l in i'i,; 2, the api-.in .U. The otlu'r .l,\ice is inMalle.J at the c\ani.le plant ..I the same ami'ij-:rs. i.-,'.> wheel 6" in the tailini^'-laumlcr driving' the tjnxived wheel /■." thiouuh the mecHuiii of a emsseil eonl. Hani^'inj,' Uh>sv of the shaft of /•; is a heavy arm of iron ( . I'onneeteil l,y / to the sainphn<,f-hox. The pi;i D earries C around with K until it reaehes the position shown in Fi^'. 4. From this position C falls hy its own wt'ij,du to its lower ])osition, swini;ini,' the sample-box throu.ijh the stRam. In the lower i)osition it remains until D eatehes u\> with it. when it is carried around a^'ain to the upper position. Duruii; this movement it swin^,'s H lunk still further out of the sue. nil. This is a very jiretty meelianieal arran.i,'<'nH-nt and works admiralilv. f6 ■* j.yy.iiff"-^*" Fi>,'. 19 Another Siimplint; Device. The use of the flutter wheel is, however, open to ohjeetion in that the time interval at whieh the sample is taken varies somewhat with the quantity of pulp passing. Assume that half the mill is hung up; if under this condition the wheel C/ revolves half as fast, the sample interval will he doubled, and as there is but half as much tailing dropping from .4, the amount of sample taken for this period will be one-quarter of normal, when to give true results It should be one-half. With half the flow, no doubt the wheel (i would not slow (loun to the .'^..Tnie ■•'i\:-.:\ ••.■.:•. ;t -.-.r,. .'.> m 160 A7-;( EAT CY.\\!.')F. PKACTICE. slow (iown sliKhtly, and observation of the sampler in operation shows this to be the case. Moreover under the best of conditions the speed of C is not uniform, so that a better arrangement would be to hav. /•: actuated through the medium of some reduction gearing from the mill-shafting or from a water-wheel driven by a stream that can be regulated. COPPER IN C'VAXIDE SOLUTIONS (\iivcnil<-r H. IBOC) The Editor: Si ir- I noti' what C. A. Arcnts says about copper precipi- tating on zinc shaving', and. havinj,' had a similar experience, I can a,i,'ree with him that ojjjier may not he a hindrance to f,'ood precipitation. Two years a.i,'o I was operating a cvanide plant in the desert country, treatinj; a dun p of old pan-mill tailing. One mill had burned down there, and there were numerous small pieces of burned copper jilate mixed with the sand. The copper did not bcpn to show until the jilant had been running' about four months. The concentration of copper in the solution was probably due to the fact that no wash-water or weak solution left the plant except that cxistinjr in the residues as moisture. Copper bc^ran to show first on the fresh zinc that was put in the lower boxes aner 1, ()()(! oz. of i)re(ipitate !i| <'ost of air jier l.(M)() oz. ,,( preeipitate o.(W "["t-'l $-> . .-)() I 'V'uinee in favor of oil jn.r ! I,(M)() oz. of [ireeipitate . I {)(> T-t-1 $;J.5H~! C'OKK. Sep'. i;i, |9(Mi. Preeipitate I. (MM oz. Trov Coke jji 11, '•''"i'-' Si hr. Cost of fuel jier oz. of pn ■ I)recii)itale SOOOJ.'U t'ost of fuel per 1,1)00 oz. of preeipitate ■.' ;{l Cost of white lalK)rper 1,000 oz. of preeipitate 1.2.) Total $:j,,r,,; •■> \iJ>^ '■is^: ,<- V7-:.sys BinvF.Ex ( ok/-: axd d/l. 165 SKCO.NU TKST Sept. JO. I!)l)t). Prt-cipiiatc :, (J(J4 ,,z. Troy !'*' ^1 ^;ai. '""'• ,, UK hr. < ost ijf fiii'l |i,r iiz. .if prr- i''I''tatf $0 ooooij Cost 111 fufl JUT 1,000 iiz. Ill I>reii[iitali' o .,;{ ('■•St of \vhiti.>lalMirp(.r 1.00(1 oz. of iirtripitati- o .-,,-, <'ost of air per 1.000 ipitate ;i .-,:>J ,iz. Troy ''"'^<-' -JS-A \h. l,i"if loj hr. I ost (jf fuel per oz. of pre- *■'!>"•■'('• ■ SO 0011)7 ( ost of fuel per 1.000 oz. of preeipitate 1 Ji7 Cost of white laUirper 1.000 oz. of jireeipitate . . , HO ital SJ .-.:( Tims, It, both thcsf tosts. on entirely (iitTtTunl ila.sscs cf mate- rial, wv^vt a uniform rt'sult, which shows stron^'lv m favor of the crude-oil method of melting, at least as far as the Repuhlie of Salvador is eoneerne.l. There are other advantages eonneeted with the use of oil which do not apj.ear above, hut which should not be overlooked. Firstly, the elimination of a bv-produet in the shape of coke ashes from the wind furnace; and secondly, a Rreat saving in labor and personal discomfort to the man who does the melting, which is a point of some importance in a tropical climate. K M. Hamilton. San Sebastian, vSalvador, October 22. TUBK-MILL LI\IN'(^, ' N'mvcijiI . ' 17 liflMr 'I'lir Hilit(jr: Sir Aftrr rcailitii,' alnnit the ],nip(>sc.l tul.c mill VunuiS. to l.f iiM.l at the W'ailii iiiinc. in New Zcaian.l, 1 lli.Jiii;lit it would !■(■ ot iiitcnst to \-our nailers to kno« ui mv cxiHTicncf with prartiralh ,lic same liiiinj;. We have installed a r.'-It. mill, made in the sli(.|.s ,,{ this eonipany (Oriental Con. Minini; Co., of Korea', .iiid. luiii'.' sli^htlv out of the world, it WMtiM have !« , n ■>. (Jiiartz li .Mortar 7 Slic ■ ^-^^-^^^^--^ ■ Fifj JJ TulK-Mill Lining. a Krtat saxinir to line cmr mill with oniinarv hard (|uartz and oenienl smh as descrilieci in the .Mi.mnc, .wd .SeiKNTii-ic I'kkss of fulv 2S, lUOti Ahout nine months aj,'o it (nxurred to me that if wo eould utilize our hard quartz, to^i'thfr with a proper eenientini; material. It would mal«' an ideal lining- for a tulie-mill. The most im- poiLaiii point was how to iioid it m plaee within the tuhe. The . < n HI: MILL LI mm;. 187 null wa-- pm tn...,th.T m tliHT s.vfinn. ,,r >l„rts n\ ,n,„ an.l all "■'■" '■|\. t,.,l hot Thrs. s,.i„,„s „,• w,-ll knru- w.ul.l not hv as k'.M,,! a- ,m, , .,niinu..u< .l„vi ,,r tul.r. f.,r thcv u.Tr liahlc f, spring' ;' Irak an.ini.l ili,. vxvru This wuuM „„,.., a , Mnsi.|,Tal,lr Inss "1 "ur raM , a-^ u,. arc -rin-lini,' cn.vntratc to a sl„,„. i„ stn.ni,' .,.,,.. 1 IK- material groun.l ,n the mill was concentrate, evanide solution beinj,' used. -,,-f=""^ -PTr-Tv I6.S KlA /-'.XT ( WWini: /'V i( //, 7, Xou. in rr^anl to tile ucarinj,' ..t llic lining,'. I rati say that it was l.v no means satisfa. tcrv At tli.- rate it was wcarinj,' it WdiiM have only takin al.out two weeks to cut away all the lining' It was rapidly undermining the larger pieces of (|uartz - that is, the eemeiitini; material was Kradiiall\- cut out Wherever there was a sjiaee of eement between the quartz that was possible to wear, it was sure to he j,'raduallv worn awav an.l cut out. allowing' the (|uart/. piei.s to fall out. \ini eaimot uiia<,Mne the I.eatinK and weanm,' ac tion the pehMes have (m that eiiuentini,' material. The ,|uart/. in th.' lining will stand alrii,'ht. htit the thin^,' is to keep It in plaee. H ven with sile.x linings, where the best (pialitv of "liamond cement is used, and where all the bricks are made to tit as closely as possible, the iK'bble will, in spite of all, wear away some of the cc'inent to a certain depth. Now. how cat) vou ex- pect onlinary or porttand cement to stand where the spaces between n.uKh pieces of quartz are ^'reater' it may be easy to think in the tirst i)lacc' tliat thi.. lininj,' is ^join;,' to hoM. but to make it is another tiling. The linin),' appeared to be very hard before usiuK and certainly ou^dit to ha\e been, for it had plenty of time to set. The prmciple of tlie lininj,- is all ri^ht. but I am afraid wc will have to find something' a |,'ood deal hanler than i)ortlan(l eement for a cetiieiitin^' material. Cast-steel liners were the next to be trieil. as we had on hand enough of stamp-battery liners (4 ft. by <» in. and I in. thick) for our purjtose. Before putting them in place the old quartz linini,' had to be removed from between the rails by means of a sintjie jack and moil. It was no easy task, for it was hard and the rails held it in securely. The rails were left in and the steel plates put on top, bein^ held in jilace by bolts with counter-sunk heads. The bolt extended out throuKh the shell, and over this was put a washer made from a piece of old vanner belt. (Jn top of this was. an iron washer and then the nut. There were two holts, i,ne in each en.l of the plate, to hold it in jjlace. and both were scrvwcd down tightly. After a day or so of runninj,', thev were screwed up again. J'robably it was necessary to ^o all over the bolts on the tube-mill a third time, but aftei this we never had any trouble with bolts leaking or getting loose. It was absolutely necessary to have vanner-belt washers next to the shell. Fig. 2:i will show the method of holding the liners. The rnili; crico tl-x. ti.l,<. ,T,-,.Tt .■>,-..„.,* i, ,.:,.ii i ■. ■ 'I I HI: Ml I, I I i\,^ lt>!) •'''"--(.■.■ll„ursl,avc. Muu l,..,.n,n us.- „„,. , ,, 1, .,„,! .!„,„. F.. 2, , S,,.,, .'la,,. ,.,n..r , r,„.n,.rs„„W .,.„, , s,,.., ,<„, th I' null aj^'ain as yoar.c c-on.vntratr, makinj^ n«ht t-ns j^mund '^""1. -ne of ^n-eat ,n.,K,rtan.c. to tul.c-nnllin. If „„„-, ,,ould Taraojl, Korea, St'j)tcinlier !'<•. A. Fv DkIi KKR. i ■ ■-:.;j-5; ri '■rri] '1 1 ^ ^ tif — „ n 1 -^-— - A siMi'i.i- soi.iTiox .mi:ti:r ilVicml'i ■ I I'llii. In tlu' ..piiMti.iii (pf I \ani.l,- |i|ams, ii is luarlv alwav-. im[iiii-t- "" '" ''•!■''■ •' nil 'an ; i.l . nr,-rcll\- .|.irrmiiiin- the ainMunt "f u,,i,i_ '"■aniiL; snlutiMii culcviii- tli<- jm'. ipnatiii- li'.xi's. In diiu- plants -'1.1; -I ''''■^ '" '1'"" 1'.^ ahrrnalclv (.lluiij an.! .iisrliar-in- Minij,-\ats of '•"'■|-\' - ' '^i''"'- :"i>l nTur.liiiir til, hfi-ht of solution . „h Utile a ^""'i' '-^ 'i"''' This IS a I !nnis\ . th'.ui,'li ar ruratc cnoiit.li, nnt!iu,i. Iitil has tlic iihj.Ttion llud It iTijuirfs ncarlv lonstant at t.'i^lancc. .•1 SIMI'LI: >(>/.CT[i)\ MI:TI:K. 171 Variovis water iiU'tcrs arc nianuladnrcd whi.-h. can ]k- v.<\-\ 'inr sulutinn work, v\ ■vy'i that tlmsc of sut'fic irnt rapatitv arc cxiivn- ;-i\c, aii(i arc oj.rn to jlu- olijction that the lime which i> used in prai tically all c\ aindc-i.lant solutions, so ,n deposits a scale m the workniL; parts ol the nictcrs. which renders thcni inaccurate or puts then! out of Ijusiness altoL;cthcr. 'lo nicit these ohieitions I adapted the faniilia'- sanii)lin,i; box illustratiMl herewith, to tln' rei|uirinients of the . ase. and one was in:-ialled as a meter at tlie Lihertv Bell mill The de\icc is simple and cheap, and as others may lir-l it useful, a .Icsiription of it is not (iut of place. The arramrenu'in can he ,ecn by reference to l"i>,'. L'l. The eonipartmcnis B IV alternatel\- take the .solution flow from the lecd-pipe. As ,i com;iartment Iills. the weight of solution o\crl.alances tile empty compartment and the liox turns throu,i;li a short arc, dis( hari,'in>,' as it turns, until it is stopped l,y the spring's .s ,s', l.^icli time }i' discharL;es t he lounter r.'.-isters 1, The meter at the Lil.ertv Hell is set up ox'er a \at. and the pans shown m the dia:4ram are alwa\s sulinieri,'ed. Their retardint,' elTcci IS neccssarx- to avoid excessixe iar. A dash-jiot would proh- al.ly do as well, or else the liox lould lie made .if nutal with a Jiear shajied cross section, and hum; close up to its centre of gravity. The latter for'ii would not need the sjirini^s or jiaiis. At the Liliertv I^ell, the icinstant of the meter was dcterminen,nman,I attcntiun. I,nn- uritirn I,v •"irul„,,s„nl,r,l,„k,.t,unvntpra.t,rr Mr, Husqui tavur. t,l,.T- .",U ma.lnn... ,,( ,1,. M. „ „v- Rutt,,-. tv,,. and ,. in.I,n..| ;., .„„- s.. .T. a> Mr Alnv.l Janus ,l.,.s, ,ha, nitrr-prcssrs will shnrtlv Ik- >vU'^'at,.l ,., ,1„. l.a,k,n,nn,l Tins appears ..p.n lo ,l.,nl,t Twu .|'^>' ta>is an. a^an.s, ,,. nanuh . tin- x.ntinu,..] use ni prrsscs at Kali^,,.,W,r an.l , hr s„.., ,.ssinl nnprnvnn.nt. nrrntiv ma,!,- l,v ■^''' / ^^ •^''■'''■'" ■" ""■ llnnu.slakr Fn,n! Kal^'onrHr wc I,,,.,- ■" ' "'"" '' ""■ '^"l.^^vay n,v,.nlr,n. a horizcnta) rrv„lv,n.. ^';"";!""" ^" """' "'"■- '"" ""> n,a.lnn,. has vi tul... tnr.l ,n ""■ ,^ "■"■■' -^'^'"^ -^l 1">— >'■ ■" all ,lu. san,! U,u\n;] a, Kal- :'""■'"■ ■■"'>""'^^ ""'"-'"'1 "-- ar.. ,rra..,ll,v ,],.vu.,.s ,„luT ,han lilt('r-prr-.s,.. All llu- lar.'( aii'l till- i\ anhf.,- is nuw irct ' itini.s in 111,' l,a< k .tlio,l II,. has enlarged Us s..( pe and sinij, lined ,;s .letails U,th .'4 fiifr-presses. eaeh wei.„dnnK' and A t,.st has l,een ni.-.d,. .„, (i.ooo ,ons of .slinie. In ehar-m.^ !"■ uses a pp.ssuiv ot ;;.-, pounds, while leaehini;, 1 2 to 1.5 ponnds^uid l<'shn,ew,th,apr..ssureof(i.-.p,,-andsper,s,p,areineh, Outofashtne -'"tannn^ !U een,., h. extraets s:) eents Mr Hosqu, „ves other 'l''ta,ls:thos,.we,|uotearefron>,Mr Mernll him.self. It is a remark ^'■l'' la, t. worthv of note, that alter 2s v..ars working, :{5 per eent "t 'li-' H..nu.>take ore still eo;n,.s from surfa, e .xeavations \„, """■■■ "'^""■'- i"M' r inal ,s ,he us.- of zine dust as against shavm- I'Ki X.KESS !\ CV.\ Ml). \ Tl( ).\\ 17,? tin. „rm.r ,s ;;ai„in, ^rnun.l in AnuTira. \\V aiv int.,rn„.,l that at tl,r \\a,h,, trrat.n;, -..o,),, „,ns p.,- m ath. it romnns sev.n ;"-" ^"'Unn.uuslv to .Iran th. l,„xcs, usin^^ z,n,- shav^n.u'- at the H-nnr.t.'r. tvv:.un^^ l.-.jKK) ,„„s p,,- n,„nth, „nlv fun, ' m.n are ^■'"I'l" • ■ -. I.alt.lav. usint; znu ,h,s,. I„ all tluse matters there ,s ;'/"'•'■'''"';•'>'"■> '" improve. an,i it is nnlv l,v unpreiu.liced tests that the l,es, „„.thn,l .an he ,ietennine,l. On another paL,^. , ""■ '•- " ■^""•■'" ^'-'-'^ ^'^''^'tlv to ,he value of o„r Diseussion ^ ''■''■'';■' "'^'"^ ''>• ^' '^"^''-i" ^vhuh he eompares the use of the Moore and Hutters filters. Such t,rst-han,I information from practical men w,ll he ol service to all those wh., use evani.le m m.llin^j We trust olner , u.n.ls w,ll not hesuate to put their exper.enees on reeor.l. wlu-rr a can he of L,reneral service. CVAXIDK PRACTiCI- WITH TIIK MOORK FILTER IJm mil I i:., I! lu; Til,' H, liter: ^•'' M'' I'^ ''liliiKm Hrowns nn m iMiitriliutidn lollir lucr- atm-r Ml \-aruuiii till.niiL;. inlitlcd •C'vanidf I'rai tuv with tin- .Mi".ri l"ilu-r, apiuanii.,' m \ (,ur issmis of' Si pn iiilur 1 am! N, is <>uv > tare (hlliruh ])n.hl, ,ns m r>-aiiiihiti(.n. Of i l.r trw artirks -u tar [)iihiishi >\. Mr. Hrowii'- is h_\- lar t hi' trot t Imu'^^ht I'ul. ami r-.n- tani-> ilrla:! thai mhrrs haw iidt attcnipliMl to L;i\r, As thf wnirr hail imirc nr K >s kj .In witli the i i.iis! nu tion nf ihr liii.lif plant, ami its siihsr ha.i tl.r npp.irtinm\- <.| r.nni.annL,' it witli ihr Hiittfrs- CasM.l ln^tal!atl.in at the ('. .nihiiiat i< .n iniiu-. ('..il.ilirl.l, Xcvaila. till' Huturs' plant at \'irL;inia Citv, ami llu Mn^n-v ],lant at tlir Lihcvty Hrll null at Trlhin.jr. I'.ilora.l... hv has -atlur.l a Itw tarts ]iirtmlime-formin.iL; matenah than th.e Lihertv l^ell an.l llie Stan. har.l C'..ns..h,lated ores. At the time ;l;e silex was Irie.l at the Stan.iar.l. loeal pebbles ol misivllatie..us . haraeler. an.l larij.dv ..f ;j,'ne.]vis orii,'in were in usL'. Their eonsuniptDii was ah.iut ."(( lb. per ton .if san.l re- Knuimi. T.i .a l.in^'e extent thev wore flat. in.lii-atin,i( a sli.iinj,!- rather than a roilm- m..ti.iii. At that time the tube-mill was fe.l almost entindv from spitzkasten umlerllow. earr\in,i,' perhaps 2(1 t.i 2.-,', soh.K Th.e silex w,,. ■_>! in. thiek, an.l the lininj,' laste.l ^' - . '■" ''¥' . 1 "i ■- .•.?• ■^ i» ^i ^t^- «:f' ( WWini: /7\M( //( A 117/7/ ////, MonKi: I-H.teH 17.1 MX w.vks. At tlu- L,!,rr,v IVli. a Jl-,n. siKx hnni- ui a ni..!! K,! ti-'m spitzk,: irn iin.l,T,lMU -:uc h.ur ni(,mli> .,. a.tua! scrvur. As all (.tlur (un.lninns uvit ,.rartuallv parallrl ,n thr oprrati.m "I llu'M' iuu niilN, rx.Ti.I the us.' nf lucal y,-\M.. ,„ ,,nr an,] Ihnl |.Hiblrs m tlu- ntlKT.ihr slinrt luV- of , !„■ siVx at thr Stan.iaf.l c-an It si'i'ins. l,c Maim J nitirrlv on tlu' lucal [vlihlrs used. .\l ilK- Lilnrtv l^rll Hum-,' aiv t luTr tnlH-niills, ,,nr tr,] l,v spitzkaMrn un.Ur.luu as aiivadv stalr.l. uluio ill.- utlu-r> r.-cv,vi> t!K-,lisrl,ai-,-ln,n, I >"rr s,-fai„n- dassifu-rs, a o,ars.- ,,ru,iu>i ,-arrv- .hl; tr,,m T, tc .-,(!■ , .,,l„K, i„ ,1,,.^,. „„Ils, alx,. ,Iu- s,l,-x Mocks liavc lK-,n set ,,n t-,!-,-. tnnnin- a Hnin- lour ui. !h-s tlin k. Hv sc'ttm-tlK-M,H-ks.-,lu,.u-,s,-,,tsc-,-inslikt-lvtl,at ihr uvar is mcf.-asr.t as 'In- lK-.idiii,u plani,^ .,t tlu- ,,n-inal Imu-stnnr so-in to M- pa-MM '•■' 'iH' tlat si,Ks oi ,!„■ Morks. Capptn- ,s u-natnlv not so l.a.j w,th thr c-,1.4.-u-,sr Mo.-ks. The- .-.l^^.-Nv.si- 1,,,,.,-^ has ahvadv ha,l "HI.- tnonths ot arf.al s.-rvuv, an.l si-. n,s koo,! l,,r sc- v.-ral months ni"iv. Rou-hlv. tlu- lining; m tlu- null r, u-, vinu' spit zkastrn un.k-r- tl'iu- wo,v at tlu- fair of om- mHi in two months, as then- was sonu- wastr. oi loui-M-, wlu-n it was (niallv remove.!. In tlu- otlu-i- iiiills tlu- ratr ,,f wrar has hrrn just al.oiu halt ,,f this om- iiuh >n tour months. II,-,v. tlun, an- tlm-c mills on tlu- sanu- ,,ro anil oprralm- un.lc-r nearl\- i.k-ntiral ron.iitions, i-x.-.-pt for t lu- matt.-rol thu km-.ss of pulp h-.l. In tlu- mills n-r.-ivm- .1,.- thukvr pulp tlu- wear ot linin.i,'s is ahout half that in tlu- oilu-r Tlu- .lutv of tlu- h.ur-im-h linin- has hn-n .s..nu-i hmi: over D.IMMI tons ,.f san^l re-.!.,'roun,l jier in. h of wi-ar. These faets are a.^'am illustrate-' hv latei results with t he t"l>c-mill at the Stan.lar.i. There, ,,e (irst urou.^ht ,r,,n linuv ot t-m, ,,lates laste.I (lU ,lavs an.! re-^M-,,un.l ahout 4,.s()(» tons of' san.i Dunn.i,. its hie onlv a .mall tonna,i,'e of pon.i-iailmu' was introdueed to , he mill. Ahout the time the seeon-l Imm^r „f ,|,e same kin.l was put in, arran.irenu-nts ha.i heen eompk-te.i tor in- tHMluem^r poii.l-tailin,- in a.j.lition to the .lailv mill .nna.ue uj. to the full capaeitv of the lilterin,- plant Tht- pereent.->-H. of soli.ls in the tuhe-mill fee,' .lunn.- the hi. of , he seeon.l HmnK averaged arourvi AT.' , . as a.Ljainst 20 to •_'.-' , hefore The life of the second linin.u was 170 .iavs a.~ a.^'amst !•(): the total tonna>.'e of re-.-roun.l san,l inereased fr.,m 4.S0(I t,M,ver 10,000. an,l the pehhle consumption .in,;iped fnmi (i ." 11,, p.-r t,,n to L> () 11, \il other con.iit.ons were the same. Tliesc results speak f,,r themselves ,!i! H& I7r, A7-.(7-..\/- ( )\\\/i)i-: />h',\( r /(■/■: At !h<- Maii.lan!. ! !»• ,,,.t i..v l..al |h 1,1,1,. ai S!» per tu,, iai,l ,l,,un at tlu' tul.r-iuill wa> si),2.'- p, r t,,n nt r.-.-r. ,un.| -,an,l, wlnlr the- i-ost tnr tlint I , l.Mvs un,l, r \hv same . Mn.liti.,iis at S7ll._'ll pn- t.,n of _'. (1(111 II,. lai.l Mown at tlic tul,r-mill uas (,iil\ si) _>:j;i j,,.,- ,,,„ rc-Kround, ati.l this has mihv ,ln,|,|n,l m sodiu |,it t,,n. C,,,,,,! teohnual rrsiills lia\r Ihiii cl.tann.l with the M •.■ plain at t ln' Stan,lai-,1 ,lunii- 'he hist halt-vcar. The extra, m.mi ha^ i,cen iniivase.l an,! thr est h.uviv.j. Tlu m' ivsults are mtiivlv t,, tlu' c;v!it .,1 Mr, II, II. Ki>skr. uIk, ha^i h^eii ,n > liar-r ,,t thr plant, sinrr the first ot the \( ar, Ai tlu- Stan.lar.l. (lurini; tlu- tinic th.c tulit-iinll ua.s shut .luun waitini,' f,.r t h.c .vincnt tc har.jtn m ll.r mUx Imin,-. thr .M(,.,rt.' plant linii,,.! alnn.i; as hist it rnuM without iv--riii,line Thr sand aiamiulatr.l whcivwr it had a (han.v. The Mttkrs. the at;itat.,rs, and th.r iih, nn.u \ats all turnislicd th-ir (jU(,ta of san.l and !,.rRf A raw ,if ahoul six mm was ki pi i,us\- aM il;e liine repainn.s,' tilteis. and tin:; one tn(,nlh alone made a de.Med merease in the eosts tor the Vv'hole \ear. M( reur\-stei. l,eariii,<;s tor the a-itator shafts xwiv a .i;ood d, al "t a failare. The i,alls '-round the iron and the nier, ur\ toucher into a niee iri,ii ainaluain. .iikI their use was ahandoned, Mr. Hro\Mi has deseril.ed the haski t hoistm,- arran-eiiuni at llir Stan.lard. At the Lihertv Hell, the haskets are hoisted for transfer l,v means ,,f Indrauln < ranes, operated und, r a [.Rssure ot l'."(l 11,. These \\,,rk well, and ,L;i\e inueh less tn.uhle than the dittereniial chain hoisis at llie .Standard. Where hi,i,di-j,ressnre water is u,)\ a\ailaMe, an automatie hit,di-pressure pump installa- tion, sueh as is Used for ele\aior .se-viee, coukl he utilized. At the Lil,en\- Hell also, an in.k-pen.'ent t deelru m.,tor druc is u.sed tor tra\ersin,'^' the cranes. This is nun h, the l,est arran,!„Mn( nt where .)ne erane ser\es a numher (,f haskets. The Ion- hlli r as installed at the Standard did fairlv L,'o,,d work hut th-re was,neviT- tluk'ss, eonsiderahle trouhle from twinnin.- .,r c oaks, in,i„' .,f t he fakes on adjomnn,,' filters, whieh jir, ,o, ; eifi.ieni w;i''in.„.. The tillers e(,ntinuall\- hroke l(,(,se from the spaein,^ hars, and l,el,,iv the writer left Hodie he was seriouslv eonsiderin.i,' tlie adeisahihl y of ilividinK I'ach of the Ui-ft. filtei-s into two tinits and st ri t, lun'i,' the canvas on iron frames. This was not done, hut. fr(,m the ex- perience elsewhere with the smaller hlters, it would he an imiirovt- nient. Mr. Hrown has eallcl attention to th -reater etliciencv ' r.i\7/v-, I'KM I n I- wi I II -III/-: m,,u-'>"l-''l "1 llir ,lrs,,^„ ,,l tilii-an.m ,.lant>. as u atlr,-,. ' "■ ' apa, u V ,„ a v.-fv la,-. ,l..u,,,, Thr reason m vnts |,, 1„. ,„ainlv '1'^" "> i!u-ll„.k.T,,t,l,,. ,lu..a„.i ,. l,uu^.,l up, an,! a h.-tt-ra,,,! "•'•:•-■ p.nn.aM,. a.h.nxt ,„■,■ ,,t .a,„l an,l .l,,,,,. i, ,,l,ia,n,.l i„ ih,. ,'ak,-> li i- satisla,i,,n- ,,, ,v..,r.j liiat tl„. ..t,'Mat,,l ,apa(ilv ,,f jlK' Sian.lanl plant uf ;;,(Min ,,,„. ,„,, „„„,,|, |,,,^ ,„^,,, ^,^,,^,^-.,,,,,, l.v ..!)(! i,,n> ,h,nn,t^ tl„ ,n,,ntli> wh, n nn,nt,iTt,pi,.i ,.x, a\ at .,m 7"''' ''^ '■'■"••■■'' '■" '" '!>•■ p,,n,l-,. Mr, lip,„„-. Ma„'n„.,„ tliat tlH'iv u-a< n., a,vu,n„lati..n ,,f u,..k .Mlui„,n ,n ih,- plant applu.i -'|lK' tit-M p,n,„l,.ftlH. ,,p..fat,.,n., AIUt all >,,nr,vs ,,, „,,,l,an- "al 1-- ,.l s,,lul,.,n l,a,l l„,.n ,l„ninat..l , l,,.,-.. wa> a ...ns-ant a, , u- '">''••'"••" "t "vak >,,lut„,n, wln,l! I,a,l ,,, ],. n,n ',, uast,. Mr li.--.vn tnak,.. in,i,l..ntal tn,-nti,Mi ,,t ihr Iimt,.r.-CasM.l ,,r,„v.s as l„.n,' an mur^.n ,,f ,h,. M.»„v pn„,.ss, an.l p.„nt. ,,nt t h. '■"""n,m ,.s,.n!ial l,.alnrr ,,f ,1k- tw.,. uhi.'li is, ,1,. a.llics,,,,, ,,, "'>■ "l'>-" a ,ak,. ..I sHnu. tl„.-.-l,v n,ak,n^ p,,.Ml,l,. it. r,.,„,val "■'"" ""■ i'""""-'V'l n-ntainin^ pulp. In tli,- M.M.r,- ,,r.M-,-.. ,!„■ Iill.-rs ar,- t ransK-rivl Inm, l,,a,Hn^' f, washing; vat. ,t.-,. an.l l,a.k '-"'"■ "■'"''■ '" i'^' '^^'"^ '- C^'-'l Pf,„v» th,- t,l„.-s ar,- stat„,rarv ^'"'1 "■'■ pulp wash-wal,-r, ,i,,, arc t ran>f,-rr..l t,. an,i tVum , In- "l"nn. vat, Wlvn lar,- ,apa,t,v ,an !.,■ „!„a„u.l ,n,n, a r.la- liv-lv s„,all l,i,,M-,n.u plant, tlu- Hut t.-rs-Cass,-l prurc-,. ha. s..v,Tal a.lvanta^.s ,,v,-r ,!„■ M.M.r. pr,„-,>s, hut uIhmv t !„■ nh.nn^ ,,lant nni,M !,.• lar-i' th,- r,'\vrM' i,s tni,'. ^ ■' "'.I'M !„• lH,rn,- „, „,„,,! that tluM-.- is a wi.K- vanati..n in tn, shn,,s ,na,k fn.tn ,l,ltVr,-nt „r..s an,! that ,h,-va.t .ItHVrmt Iv "^ •'"'■'■-H^""- -'"'^X a plant ,!,s,^,i,.. -,,ha.i.!l. a ,vrtain ,,,n- "'-'■ "' ""•■ '"■'"■ "'" ''^'^- ^' <\^(U■u■m ,.,pa,itv at an„th.r. Thus •" ""■ '"'"''■■'.•"•nn null at ( ;,,|,!(k.M, ,]„. l,,a,li„,r ,,,,„.,l i. ,.„p. .-ill nnnu!.-s, uhil,. at 1 1-. Stan.lan! n varus Wnm L'l ,., ,; h,,„rs ' > I-'i'lni^' ,m ,!„■ pr,.p„ni,,ns ,,1 .lav shnu- an,! hnv sa,i,l in l,c- vhat-.- an,! th,- ,l,i,kn,ss „l pulp TlK.vf,,r.. a plant .Ksi^n.,! '" ''-""ll*' <"",,ns p,.r ,lav ,,f (ntnlnnat t-m sl,„i,, ,,,,„i,| f,,ii f..r short "' han,!hn,^ (id t,,ns „f H,,,!,. ..l„n,.. At ihv l.ih,u-tv M,.!l ,!„. !,n,!- >■;. prn,„l ,s „n,- l„u,r uhi!.. at liuti,.rs' Vir.Muia "ttv plan tin- inn,- var, s tr,„n W ntinutrs ,„ „nv l„,ur. .\t all ,,f the „lants " 's tlu aim i,,l,u,l,l up a .ak.- ,,f tnmi ,' t,. 1 in. thivk ' ^j^-. .':^^:^*r^|j^/^" '-^f^^X i; A7-,( l:.\ I I ] Wini: r/<.\( I l( I: It will 1h ;i>-um; li Inn- \hn\ the (vscntial tipcrat icin- ..f l(,aam,- Mmic. ami tills iliMussii.n is i unsfcuK'Hth' narrow,, 1 tn a loiisiiliTaticpii "f III.- rrlatnr iik rits ol iransfcrrin- the liltvis aii.;lirr vamuni can \>v iiiaint aiiicil within thr filter. (.11 a. ,,,unt df the |H,ssil,ilii x- u\ arraiii;int,' tor lH,tt<.iii snlu- ii"ii 'li- liar.uc frniii tin- tiltrrs, ivhirh (amioi l.c (hni,. ,.asi|\- with the M,,,,r,. pnurss. The .litlnvilr,- is n..t -rrat , h(,wv\ ir. "as the snlutimi is raise. 1 in the siutn.ii pipe in the .M,,nre nhiTs ..11 the imneipk^ <.t the air-litt. an.l there is nut, ecMisecjiient Iw a sdiil euhinin .>f sulutu.n, reihuin-,' the \aeuiini Inut I'nr tout .,t lilt in th.' suiticn j.ipe The rate .,t' h.adiiiL;. als,,, ,|<„s n,,t inrcase direeth- with the \aeuuin. l.ut is ..eater at tiiiKs with a Inwer than with a higher \,aeiuiin. At the Liluriv hell, when e ver\ t '.ini^r ,., wcrkin- snioiithlv. the Mor.re pl.ant will pisi alidut liuM e^'ii with the i.iill enishini; :r.(l tnns per .lav. In onler t.. ^ive the . ak, s a i.nliniinarv weak sMlution wash an.l allnw als.) f.-r repairs. an..th.er set .>(' filters an.l another washing vat are to l,e installe.l. Hesi.ies the neees- sarv settlers an.l a-itat.irs, the plant at ], resent < ontains si.x vats, two ,.1 ^vhi, h are t..r l.)a.lin,i:. an.l five haskets or filter sets The" baskets are tr.msferre.l hv tw., overhead traveling' lu.lraulic eranes. an.l eaeh transfer takes ten minutes. Kaeh e.iniplel evclr re.iuiris two h.iurs an.l fiilp. wati^r, etc.. wliieh is depen.lent on the size of \ats and fiunips." To arr:\e at a eomiiaris.)n. let it he assume.! that the Lib- erty Hell plant is t.^ be ehan^'ed from thi' Moore to the liutter.^i system. Instea.l of the pre'enl arrangement of "wo loadinj,^ and four washin.t,' va's these, an.l the additional ones neeessxtrv will be used for all operations. At Virginia Citv the \mv of fil- tering and emptviuK the filtering; vats is from l." to 20 minutes. At tlie Combination it is from l.i to 2.- n.inutes, Kaeh filterintr vat at tl Liberty Bell contain., ;}.().'■)() eu. ft. A ti-in. centrif- u^'al jiump at normal speed would fill or diseharKe a vat in approx- ( y^\/ni- I \t III A 117/// ////, M,H>Ri; I'll.i i.,u 17!i imatcly L's mni . ,, 7 m piuiip m is ,,i,ii . an s in pump m I 1 mm . •'•"I ••' ">in pump m 7 " numil.> Tlu l.nxv |.mnp, mvuK,- il,,. ""■ "' ''"'^^' ^-'Iv '. "li" Il ;nv a sMir-.r ..MnniMr m pumping; san.l, whilr ihi'smalliT pump- mvuKv a larL;rr planl I',,,- a nu.MI, (.our.^i'. 1, t Us .MMsi.Irr il„. uisiallaiiMn ..| 7 m. pumps |i u,|i praniiallx !,.■ nc.rssarv ic m^iali a pump I., ra- li xal. m ..,•,!,. r '" •■''""' "'"'"'■ valw ...mpli.atu.n. Tlu . v . |r f, „- , a. I; x at ''"■"■ ^^'" '"' -'-^ l"ll"^^^ l.ua.lui..' ,,nr liMur. pump.UL; ,.ut pulp '"^ """ • l"i'"pm- m uahr |N mm . ua^lm- tlir ,akr nnr l„,ur, 'li-liar-ui'^' I.-, imn . pumpm- l,a>k wain- Is mm , pumpiii',' m I'lil!' iMnm .tMlal ■! hr, -.'7 mm,s,v:ilir ;{() mm., a.s t hat mmli. " ""' """•>■• '^"••' 'I""' ■■■:ll 'aMl\ 1„- ronsunu.l Tins . v. Ir is lon-rr l.\ .".'I mill, than wnliilic M.mmt plain. A' i:, tilirr- .hai-.s p,r,lav H,,. usual run ilunis a ,..tal inn,' m. rras,- of ••J: hr. ;{() nun n .|unr.l i., han^llr tlir i.,nna.L^r, am! pmvisiMn u:l! "''■'■ '" '"' '"'"l'' I" lian.llr II ..xira riiar-r.s p,r ,lav ,,xr;- uliar thr prrs,,,, pi,,nt v.MuMiak,' ,atv..|. This nuans t ]„ ' ms.allat i.>n nt thRr m..,v nli.r M^lsan.! t v,- , mu,-,. vals. In a.Muion. tw., Mura.^r \atsw.,ul,l ha\, ;., l.r pmv i,!, . 1, n,u- Im,- wairr and nnc tor pulp (,„• :akni.^ ,ar,- nt 1 1„. tlu.x ,,1 malrnal .lunn- np,. ration 1 hfsr sJiMuM lia\. a raj.aritv n; at Last (i, 011(1 .u. H. .a, h an.l '""•-■ 'lian tins u,,uM !„■ .KsiraM,.. \\\. i,;,,.,. ,,„.„ ,„.,, „,,;,'.„,„ vat.,,f .-{.(MHIru ft. .apMot \ , 1 lirr,. a. I. lit i,,nal hask.ts. ,.i.J,t 7-i,r >vinritu-al pumps, uitl, il,,. nr.vssarv ],ipc r. miic tiuns. i hr,.,.-xvav and .sim,'K' \al\vs, l„ liitii;. liuf shaft in,-, m,.tt uni Kss ihati ti,(ll)li .u n. raparitv .■ach, all ..f xvhid. aiv l,al- ancvd a,i;..mst tun luavx t rawlin.i; hvdraulir > fanes, with t!,r nc.-, |„r lic,rsf-|H.u, r m.inth. ii wniiM ]„■ l,ar,I t., ,a\ wlial ''"■ 'M'-.i iM.u.r l„ll „,,ul,l !.,■. SliMuM t,,ur ,,„m,.. 1„ u,,rkm- '•'■;"■ Ilic maxinmin lift at ..iir tun.-, «liuli u..„l,l „,,i 1„. u„i,k,ls"^ ''"■ '"11 '"'■ liir ninnlh uuuM !„• al.nut .<•_'■_'- It u,,uM pnil.al.lv nnt l,r Kss than Sl'il an\ ,,nr mnntl,, ami mi-ht run up t.. S:{l)lt or Til. T I ", |. (K. ^Il ua. n.arlv tu.ntv ^.a^s a^n ,1,., , wu (;ia>«„u .homists. la.Anln,ran,| |.„rn.,, „,a,l.. , „,. h,M ,>ra> „, al applira, .nn .,f th. .l.ss,.lv,nu art.on of a .!,lul,. , van„ir s,,hu>„n „„ „,M Th.. nnn- oss was at oruv a,l„,,„.,l ,„ X.u Z.alan.l and S.uth Afrua In til.' lattrr rnnntrv all .!„■ ,.„n,l„,M„s «,.,•.■ „„.; tav,„al,K. I,, „s su..vs>, an,] ,!„• .unnuuus ,,n,,„s ^i..M.■,l l,v ,!„. ,„„n,.r plants a. ' m.nn,« mdustrv hv the B,..r war; and also, i„ part, to the con- servat.sn, of metallurgists on th.. Rand and their reluctance to •Kov,^,, ,,v ,h.. a,„h„r fr„n, a pa,,,, r-a,, ,,.,,„, ,hc .X„u.n,an M,n,n« C„n«.ess. '^^:-'';, " Y: -^*^-^ 'T-^^'j^" r^?mrM ^^: ^ MICROCOPY RESOIUTION TEST CHART ANSI and ISO TEST CHART No 2 1.0 I.I lift m J-* III 2.5 \\22_ 12.0 1.8 1.25 111 1.4 1.6 ^ AP PU^a IfVHGE Inc ^= t) *82 - 0300 - Phon« r= -6) ?88- 5989 -FoK is-J /\7-:( i:\T ( )\\.\'ii>i: I'K.u in !■: ai' iiii|innaiU iiiT' i\ aliniis iiri:4inalinL; flsi-winTi-. Tlir l.rdtlirrs Dciiii} .ri\' the [\y<\ lit tlu' Railil lllrIallur,L,'isls tu rrrn^iii/f the iiilpiin.i.,! r nt liner ,L;rin'liii,L;. aii'l tlicir ciuTL^ctic aihmarx' ni tiilK'-niilliiiL; aii'l lillrr-pa'ssniy tiiiall}" rrsultcil in llu' arrrjitaiKu of .\iiv iintcd that all the inipdrtant (k■\i^^■^ int i'imIihimI inin cxanjilc practiri' hail hern | n'cv ii nisl\- n-,ril in niluT iii'lusl vic^. j-^wii the I'lin' (listriliutrr u>cil for dist rilnil inu lailmu in a It achiiiLr \'at wa-- an adaptatiiin nf tjif '■unininn la\\■n-^|>rink^ r The tiltrr-jiri^s had hi'i'ii empliivrd td ^tr.iin sniuti'in^ in tlu- rrtiniiiL;' nf -.u;^ar: tlir t f.lx'-niill liad lit'cii in um- a-- a dr\-'^rindin-4 niacliinr in the miiriit indnstrw Tlir nulallur^i>ts of Au'-traha iH'\-cr ti.nk kindl\- tn di I'an- tatiun in ^linif ircatinnit, and tlir int ri iduclii in i .f thr lilt>.r-j)i\'ss was the result. In iustirc in .\i'riia.n Mjn'ratni-s, hnwi w-r. it nnist !k' said "•hat iK'rantatinii wa^ wrll suited tn i'xi>linL; iimdilions. Tlif |iri)diu't the}- wrH' liandlin'4 was tim Inw-L^radr in stand the jirnhihitixr ii)-.t nf liltrr-]>n'SsinL;. in Wcslern Australia, the filter-jivcss was applied tu a nuuh riilicr ]n'Mdiut, and oiu' nunh lietirr aiiaptrd t(i the nielll'id. Till' iil,\iiir,s iihifctinn lu the old i\pc of tdicr-pn'ssos is the hi,i,'h cost ot in>ta]lat'on and operation, hul thc\' newvt heless enjm'ed a utrcat success; and it is wr/-.l//-;.V7>' IX THE I V.WIDI: I'RiH ESS im:{ is suM .n twi) ^izis; Minks _'t in. and \ in. thick. Tlii' >iKx lining,' is laiii in uniriit and \\\\\ kisT t'niin fcnir to iiL;lit ninnths. dcptiKi- in;,' U])<)n the nvv . Wlun rradv to oinratc, the mill is charf^'i-d aliout lialt-fiill with tlint piddiks. The prndiut to ln' rcdiuiMl is fed into tlic mill t'ltlur throuj^di a spiral, or a dcNict- of the >ttitT- int,'-hox t\p( , and the ri-),'round matrrial is disi.iiarj,'f(i at thf opposite end, In'int,' tiind\- .ommimitcd !i\- attrition a.i;ainst thr Hint pelildes ami the lining' durinj,' the slow revolution of t lie e\linder. The a\era,t;e s])eed of the tulie-miil is from "J." to .'<.'. ri\-oUi1ions ]ier minute. The Hneiiess to which the san', tons of ore per day, passes to the tube-mill classifier; and of this jiroduct about 7."', i^m^.^ to the tube-mill, or 24. G tons i)er day. The following; ti.Ljures may be of interest: Cost ot 2J-in. siU'X linmj,' laiil in null $;<■':) ,-,o Life of liniiij^ 4' month.s (- ost of lininj; per ton of ore stamped 7,7 cents Cost of iH'lililes delivered at (loldtield $71 per ton (onsuniption of pebbles ■2AY.\ lb. per ton of ore stamped ( ost of pebtiles per ton of ore stamped 7.1 cents lV)\vcr consumed J.', h.p. at $ll,J,i per h,j). per' month < ost of power Jti.7 cents per ton of^ ore stamped ^^unnnarv. eust per ton of ore stamped. i'!-'^'.'j''-'s SO 07 1 r'"'"K 077 J ""■'■■• 0.267 $0 415 Tending the mill is one of the several duties falling; upon one man, and the consumption of lubriiants is almost negligible; therefore 1 have not included these two items in the cost. Tins •cost of 41c. per ton mav be assumed to be the maximum for tulx-- 1S4 A7-(7-..V/- ( \M.\7/v/-. I'N.\( ri( /■:. milling:. "WiiiL,' tu tlic \(T\' iiii;li (.i-,t of lalji;r atid lr,iii>]» jim in suullurn .\r\aila i ani|.s, 1 haw alrrailN rcrcr.-i d t<. tilirr-j.nssin.i; as an t-.-ialili.-ln li IirartuT in \\\sti rn Australia. 'I'lir pn ss \\a.^ never wrv ]in[,u- lar m Aniiriia. anil K \v suctrssful iiistallal ions arc nroniid. Tlu' most notv\\onli\', pcrliaps. is that (jf the (lold Road niiiir. iirar Kiivi,'iiian. m Arizona, \\1hm\- two fixc-ton IXlinc ])rssi's ha\-c lucii suii.rsslnll\- operated for some time. Alioul three wars aijo Mr. ( ieorL;e M ■( , alter a series of failures in an aitemjii to lilter-press sliiiie at till' mill of the Consolidati'd .ilereui' t'o , in L'tah, desised a \aeuum-lilter and installed a plant m the M. reur mill. This was the on-m of the \ aeuum-liiier, reeimi niodifiea- tions ot whieh are to l,e found at a nunilier of mills in this eoumrw l"..\perimems reeeiitlx- made m Australia so far demonstrate the supenoril\- of this method oxer ell others, that it .seems safe to prediei the earl\' disappearance of the filti'r-pri ss. rile unit ol tile .Moore filter is a reetan,L;ular weiodeli framt' co\ereil with cainas. and prox'idcd with a \-aeuum drain-pipe extending; to uie lowest point of the interior. These frames ai'e 5,'rouped to^rcti^.,- i„ ilusti'rs or haskets. which are raised and lowereil li\' means ot a hydraulic ( raiic When lowered into a siiitalile eomp.artment eontainiiiL,' the slime pulj), the waeuum is applied to a lommoii pipe connected \\-ith each frame. The r.ohition is drawn tlirou,^h the caneas, and a slinie cake wiryini; from ^ to ^ in thick i- .deposited on each side of tlu' filterdeaf. The cluster fit tiltcrdea\-es carryim,' the charge of slime, weiijhint,' sexcral tons, is then lifted from the pulp, shifted automaticalh- to an adioininj.; compartment eontainiiiL; the \vash, where it is as^'ain lowered, the \aeuum applied, and the ilisplaeini,' operation repeated. The load is ai^'am rais.d and shifted to a bin where the cakes are ns to the .Moore filler are the hiah lirst cost of the mechaniMii rei|uired to shift the slime and the hiuh cost of main- tenance The uniiuchaniia! and cumliersonie features of this s\steni led to the inlroduitini by ("assd of a s*ationar\- tiller, and the I'hmination of ihe a"kward tncclianism of the Moore schenii- It remained for Pjullcrs to ado])t the Cassel prim iple, simplii\- it. and so modify it as to make it a pronounced success at his Viri:inia ('it\- plant In the Butters filter, the leaves are set in a ix'ctan,L,'ular box or \at. the hottom of the hox eonsistini: of a /.1//'AVM7-..U/-,.V7.s !\ Till: ( Y.Winh: I'KiH l:<>. is." srrirs oi iMiinlf'l |inckct>. tn taiilitatr the clis^■llaI■l;(• nf the spriit caki'S. Tlu- nanus arc ap]nMximaIil\- ") li\- 10 It, and ( nnsj t ot a pifcc lit ciic'ia matlini^f witli a ^l-.cct "I' cain-a-^ (luiltril nn ra 'i si'lc. the wlinlr liciiii; stitcln'il nii a I'rann' i.f l-iii ]ii|n' aii'l scruri-lv sc'Wt'il t'l tlii-- pipr-tranif. wliir'n in turn i-> suppnrtr'l nii a tinitici- licailtT, 'I'lii' liott'.tn afiii lA \hr iVatiic is pcflnratc . 1 with Miiall linlrs, tlirnii,L;li wliirli tlir soliitinn cntriN tlic pipe when tile Wiruuin is applir'l. On unr si^lc the pipe tVanir is pi-nicctnl thi-('U!_;li tlir Willi. !rn licaiUr, anil i-- ruiint rlnl witli a niuimun \-a.uiiin- pipt' k-ailiirj tu tln' \aiuuin punip. The ifainrs staiiil pafalK'l in the lilttT-lmx at alimit 4 ', -in. rent its. The pulp i~- ilfawn I'mni tlu' slin)c-rcsri-\-iiif ami putnpcil int" the linitnin nf tlir liltcr-lK ix until all the franifs arc inmin-scil, Tlir varuuni is thru ajiiilicil until a (.akc III' --uitalilc tliifknrss is ilrpusitcil. anil the iwirss nf jmlp is thru wit li'lraw 11 into the slitnr-fcsri'\ niiv Tliis npcfatinn is ix'pcatril t'l if tlir wash, anil thr raki.' Imalh' ilisdiarLjcil mtn tlir liiittiitn III' tile liiix liy int fi nhirini,;- watrr nn-lrv a luw hrail intn thr intrriiir nI thr lra\TS, Thr arrunuilatnl rakrs iVi.ni rarh rh;',fl.,'r arc frtnoN'ril li\- >luiriipL,', This --ystrin ]ii is^rsSfs thr threat ailranta,L;r nf sini]ilirit \- ami low rust lit' tnainlrnanri , A |ilant nt' any size ran lir nprratni liy iinr man, wlm stamls on a pkitt'nrni un a lr\-rl with tlir tup ut thr filtrf liiix ami nianipulatrs thr lui nips \\-itli lr\-rrs, ami thr \-al\-rs with a sitnplr ilriini-aml-shrasr inrriiainsin, Thr L'dll tun plant lit tliis I\-pr in thr Huttrrs mill at \'ir!;itiia C'it\- is uprfatnl at a rust lit alMillt Idr. prr tun lit' slinir. At thr Cimiliinati'in mill 1(1 tuns ol this slimr prr ila\- arr lirillL,' llltrrril at a rust nf almin l.")r, prr tun. as fnlloWs; Thrrr nu 11 at St sl'J ]Kr .I,i\- :i(l i fiits per ii qi Twrhc h,]., al SI i.J.'i p,r h.i. |n,r niimth I I l.uliru'.cni s ami nicrlcntals 4 l.'i rtiils ]iiT nm This plant, Imwrxa'r. has a raparit\- of .")fi tmis prr ila\- If wnrknl til its limit nf raparitv, thr rnst wnuM lir rnhirril tn ;
  • a ilarif\-in;^' tilln- jircss OlKraiiii.L; a J-iii. .riitnhi-al |.inni. [<>r iTturiiin- llu- sliim- n\vr\],>\v fn.iii til.- Irarlim.u-xats {,, i\n- -iiiiir -^dihrs. ()lKTatin<4 ^tirrin.L; iiuilKmiviii in {w,, slmu' r.-scrv.qrs IJ ft. 'liamrtrr. The \,n\\rv u]:tv ]r :i),'itatin),' slinif-i'Uin|i For uses not ronm-clnl uilli liltir :i ■■ riic cv.'lc (.f i.].rration m the liiittcrs tiltcr r.iii>uincs al».ut '■'• lir. _>() nun,, it will xary. uf r,.urs-. with thr naturr of tlu^ -l.nK- t'l \n- liltciXMl. Tins type (.1 tihrr has luvn install, ,] ,.r is in pnuvss m' installa- li"n at SIX nulls, in Wva.la, .Mt xi, n. and Sahadnr. riurc ari' rcrtam ron.liticins. how.'Vcr, wIut,. the pr...hut I" lic han.llr.l is tn,, Inw-.-ra-k' to admit vvvn ni va< uuni-tiltrnn-; tins,' miuirr spmal study and a siKvial pnucss. Th,' n.vd ,,t"'a special process to suit a unique' condition was never Letter exeir,- plitud than in l}]v ease of the Honiestake ore, I shall not venture to des, filn- the .lilfeivnt prol.leins en- e.iuntered and sueeessfully so!\ed ],v .Mr. ('. W. .Merrill at the Honiestake in the eyani.iin- ,,f a tailinL,' ax era .I; in, ij less than sl.r.O per ton. The next and most serKuis problem to en,^'a,t,'c his atten- tion was the treatment of the slime, of whicdi l,(i()() tons jier waste from the Honiestake nulls. Mr. Merrill has deseriLed a tilter-pr, ss the uni((ue feature of whieh is that it ean l,e automatieall v .iiseharK'cd l.v sluicing' without liein.i; oiiene.i. thus doin^ awav with the chief ohjeetums of tile olst of operating. This press is of a common flush-plate and distance frame i.attern, l.ut consists <,f much .ar-.T units. The dimensions are as follows: .VimihiT of frames Size of frame I.eiifjth cif press ( '.H]iaeity of press \Vei),'fit of jiress Tliiekness of cake 4 hv (i ft. . , .'4.'> ft. . . Jt) tons li.") tons , t in. I Ik- puij. is admitted to this press through a eontmuous channel at the centre of th.' top ,,f the frames. When the cake is forme,!, cyanide solution is forced into the cake throujjh channels IMI'l>. |s7 :it till- ui>|K'r I "i-iur-^ At tlif l.(jltiJin of tlit- IrauU'S, llicrr ixtni'ls a I cinlimtiiu-- rhannci within whii h lies a siir.ciiiLT ]ii|ir, iirovidcil with ii'izzliN that |ii-'ii>(t iiitu larh cciTiiiiartiiU'iiI . 'I'hi^ pipe ran 111' vr\(i|\ (.1 thfiiu'^'h an a it at an\- iiia,t;nituili' so as t" ]ihiy a stream iiit'i aii\- i>avt <>i the take, washin;^' it ilnwii into thr aiituilar sjiacc Iji'twiTii {\]v (ciiiral ihaiiiicl aii'l t!ic suhitioti jiipc When the press is lieini; hited aibi learhe'l. the chsehari^e emls nf this pipe are scale. 1 The nielhuii ol ii|iei-atiiiii is as Icilldws: The ■-limi-, aftef partial ile w alerini:. ennsists (if atniut three jiart- i)f water to one ot' -.oli,!s. In this lortn it is eh.arj^'i'.i by i;ra\it\- to the jiresses at ahoiit oO-lli. ]iressnre. 'l"he leaehini,' with e\-ani'h' solution is ,i..ni' in the prcs^. the etlhieiit sohitions licin;4 eonducteil to lour pri-eipitatiiiL; \ats wlieri- the ;,'olil is rceo\-ereil on /me ihist. There is no jiouer eost for a^itatitiy or eUwatin;^, exeept for eleeat illt; the sohltion to the Jiress, Theri' will lie only (i.(i ton of solution han.lleil per ton of slinie, of which onl\- (l.'l ton will he iirecijiitatcil. All tiltcriii'^- will he ilone !iy !,M-a\it\- at a cost of two cents per ton. This plant is liein.c; I'recte.j on the hasis of tests iiKeli' in a fotir- lon press of the tv'pc (k'scril icT. In all. 1.21U tons were treateil with tlu- followiiiLr rt'snlts: 'M cents j.cr tun 10 ■ si cent-; iir !MI' , ..s;i cents or !»]' , Axcrauc as^;i\--valuc cl slinic licfore ire.ilniL-m alter ■' I-;.\ tract 111,1 li\- a.<,^ay. ]icr t-m Reciivcreil in )ircci|ii(atc ikt tun The following; facts relatinjj; to this imjiortant installation aiv of interest : Estimatcil ciisl of slinic-treattnem -"i cents ]nT ton Estimated jirotit inr \ear S:!l)(l.()(M) Cost of plant S Kld.dOl) Cost of ])i[iedines S.')(».()(t(» Area covered by plant -~ll hy (ia ft. Area covered jier ton of capacity Two square \ards Cost of installation jier ton of capacity S:{(IO Filter-press cost per ton of capacity S<)0 Power recpiired 1 ,'10 h.p, per ton of slime treated Water required for sluicing 4 tons water to one ton of slime In the elaliorati'-in of the above process and plant, Mr. Mer- rill shares with the projectors of the vacuum-filter, the ercdit of the most noteworthy advance made in recent years in the metal- lurgy of the cyanide process. His method is admirably adapted IJ „»-,!. .1 jt-c- ts an.l prolits. Whrthrr an autmnaiic all y .li.clia,-,.! ,.,v>s ran r.m.prt.- un.lcT a\vraj.v <,>n.luiu„s uith tlir vamuni l.ltrr. ,vn,ains m 1„. ■';■"" -^'^''i'"' '■">"•-,■, W,ll,lc,„,„l „,„.„ l,Kalrn„,l„,n„,, ,,,..1, a. thr Mtr, ,lu. ut,l,.atin„ , ,f .,av,tv IM- Various np,Tat„,ns wat.T '•'"'""■'■ "'"'■'• ""I'plv. an,l tlir prn.iral.ilitv .,t the niatrfial ""■1»''- tivatmrnt. as v.rll a. tlu- ,-a|.„l,ty „uh whu'l, u vu^Ms up its prci ious nitial. Spa. ■■ uill not p,M-!iut Tiir p. tuu.h np..n zm.-,lust pivcipita- """ '»'■"»•'• than tu sav that th.rr is .^v.tv in.li.af. ., that it u,ll .■vrntually takr th.^ pla.v ,,f „„,. ^Iku in.t; ,n all plants ,,f la,-., '■apauty. HU.,tnr .lrp.,su,.,n n(t.,-s a lat-r and pfonns.n^ l,d,l tor mvrsti-atinn. hut has not as vrt h.vn hn.uL^ht p. a prrtVvtlv satistartnry rondus„,n. Rr, cnt a.lvanrrs in ,van..latiun haw niainlv m ,].. NMth thr Inirr r,.hutinn cf th,. ppuiuct to !„• tR-atr,l llH' tnatnirnt of san,| l,v karhin- will prohaMv cont.nur to Ur tlK' licst tnrtho.l in a frw instan.vs; hut no ohscrvcr w,ll .Icny that thr trrn.l .,f tno.jrrn ,,i-arti, r is towani tinr -nndin-. an.l .Join'- awav \v,th Iradiin- a nsult nia.lr p,,ss,l,l,. l,v thv ,:,! ro,hu-t.on ui- th- tul.r null an.l the Hfianit tiltinn- nuth.MJs now m vo,.uc c'VAxiDi-: I'RArTici: at kalc.oorlii-: 1)1 , iiii!,i r -'.' I'.. III. Tlu' Kiiitnr; Sir 1 ii)tivi,lrr it a furtunaU' numinit ulirti a vnyv i,\ \-nuv issue lit July L"^ laillf i:it\ a tew reiiK.rks in thi' first part i>f the artiek' in i|iiestinn, there is little tn 'lisa.i,'!-!!' with, hut it is when Mr. James leaxes general \ iews. ami Ljets ilnwii i.n tn more iletaileii work, that lie appears p. lose his halanee. es]ieeiall\- in reLraril to his criticisms on the tests niaile at tin' hanho' mine, at Kal,i,'oorlie. hetween j^'rimlinj,' pans ami tuhe-mills Althou.i^h I lel't the stf- vieiMif that ei)!n]iany in .Mari h last, it is natural that an attaek ilike the one now under rexiew) on those e.Kperinu'nts. whieh were car- ricil out hv Mr, K, H, Xieolson ami myself, should evoke a replv. Takin.L,' that jiart of Mr. James' jiaper which relates to pans atjainst tuhe-mills. he op.ens with a reference to a mvsterious mine at KalKdorlie. that is practisim; hromo-cyanide treatment without usinj; hromo-cyanidi' methods, and in conseiiucnce the residues of this mine are rejiuted to he worth L'^, dwt. ])vv ton. With the exception of the loss in residues. I have a shrewd suspicion wh.at the name of the mine is. hut would certainly advise Mr. James to call at headquarters and art i-orrect ti^ures for the past few months, which are. I dare say. considerahly under his estimate. The question of extraction was entirely left out of the Ivanhoe tests. The point to he ]iroved was. whieh was the superior grinder, a pan or a tuhe-mill. I'ersonally. I think very little difference would he found in the extraction ohtained from the slime made hv cither of the':e two machines. I am i,rlad to see Mr. James rej^'rets that names of such iiit^h standing .should have heen tacked on to tests .so badly carried out as were those at the Ivanhoe. While apjjreeiating the compli- ment in th ■ first jnirt of this sentence. I would also ajiply the same rem.-irks to Mr. Tan.ies ^.v.'A h.'s, 'Ttic!;- 'f"!-.-!-; --r-i." ;r---.»i."-"u" • ■.- li»() l .Ir.lu.ti. ,„. thni ,lis,. ,\ ,rs t luit as til-' rvaiil,,,,. iul„-niil! wnrkr.l .„i alurnalr .hu-,. thr llims urn- "■at,':i uiih slimr at the vtan .,| ra. Ii .lailv I,>r l", „■ Mr. lanics '""'■''' '''"'"'■ ' ""iil'l nil..n„ 1,|„, ,1,,,, ;,t' ,hr rn.l .,| a .lav's run "'""■'"'"■ "i>".'l"l-'''l"-as.lu,l..|ian.|.|,,,„ watrrpasM.ltlm.wh '"'■ """•■ """■ '"'""■'' ""■ "I'll it^.ll «a< st,,,,,„.,l. an.l ,„, iv MarlinLr '"'■ .niMiluT .lay's n,„ tlir null \va. all.,uv,l to ^y. .yk i.,v -.,,„„■ t,i,u' '.•"111 ,ts ml! l.K.l wa. n.uhr.l l,.-lM,v sa,„,,l..> ,,| anv kui.l uaTr lakrn Srttm- asnl.^ ih,. piv, autiM,,, il„. |at,. ,,1 anv slinir Kit "is„|,. a lulK.-nnll rrv.,Kni.^ at :;." nA.,hmnns ,„,• niinut,' ran l.r iniai;iniil. Mr jaiiir^ ,!,,^^ rnnuiirnts M,nii what sar. astiralh- on tli.- lar-r •"""""" "'■ ■-l"'"' '■■ ' I'.llinrslp U-hir], is allnUT.l tn rrturii l, '■li"kr th,. tulK-niill instra.l -,| l„.i„. ^.,,t ri,l ,,f at nuvr. an,l slinws tliat ilir Fvanh.... null lia.l niorr slinir ivturncl than was its ,laily nutput ,,f tl„. ,,rM,hut. Thr statctnrnt tiia.lr in tlu' Ivanli.u. ivi'nrt that tlu' iuIh' mill l.r.-aniv rh..kr.l. has l.c.^n taken [u'rliaps '" t."> litrral a scis,., I, i. ,,|,vi,,us that as ln„^r as thr inlrt an.i "utln .,t a tul.r-niill is lai-r (■imu.u'h, i.ra.tirallv anv t-.nna-r (.1 san.l ran \,r nisho.l thrmi.uh. What happrns i„ a rasr nf this'^kind IS that thr variuns spit/.kastrn us.mI t..r srparatin'.' the ivsullant slim,- an.l fn-.lin- thr mill arr -ra.luallv rli,,k,'.l l,v the' accumu- laticm r.t lit,,' ,an.l ntum-.l tor rr-,-rin.lin-. tlu'' .■itri-t of tlu- tuhc-tmll haviti,-; mnn- ori-mal iVcl than it cati c.ipt. with i.r in "ihrr v,-..r,ls, ihr ,,,,11 mav l,r said t<, 1,.- -ovc^-hia,!, ,!.' This ,s what hai.prnrd durin- the Ivanhn.. rxpchmmts. Tlu- tul,c-mill 'inl net cxactlv ch.ikr, but the various spitzkastvn c-mpl.nvd did and alter cnTy cxpt-difnt tailed the tin.' sand was onK- i.,v\vnted from .uraduallv gaining on the n„ll l,v reduem- the' amount of on-inal tee.l. As there is a eertain time at wliieh a tuhe-mill must become overloaded, that jiartieular ],o,nt was naturallv pre- sumed to have been reache.l. Thi' same ret'arks also can be applied to the i^rindiny pans. At this point It may be as well to ^et an idea of what Mr James dcx'S consider crood work bv a tube-mill, an.l I have -'one to some trouble ,n turnin,-,- up a few statements made bv l,im during the last few \ears, and in one of them m The Engineering .md Mining Journal oi January, 1905, I notice he makes the fol- lowing remarks: ( \- 1,\ //'/■; /'A- 1( IK I: M K \I.(,(H>IIill iliiiii'^r ill,. l„..,t uiivk. \\hilr llir Ivanlici' mill lias hrrii tliriiwn nut'' Anil turtlKi" mi wr Ikim: "Tlir lniiL;tst ami nMcst milN, llmsc at llainiaii'^ Star, aii'l tlir nM Bli p\\ iihill cxlilhlt tlir lust ri stilts, itr." 'I'tiniim; ii'iu td tlir h'tmuil 17 llu' ( li>inihri i>j Miius nt W't^t- t-ni Australia er day tn a slime ci|' l.",(l, while the hanliiK.' mill was 111 It. \nn)i. r,'(|uinnj,' I'd h,]). and lirim,'in.i; !!•."» tuns cif sand t(i a shme also (if minus l"(t. It tii.iv he addeil that of the on,uinaI t\ed of li.s tons sent to the former null, !.'().."/, remained on 4(1 tiiesh, while of the I!!..' tons sent to the IxanhcK' tutie. •"*!', sta\ed al>o\c 41) mesh, or, in other worils, tln' oriijinal teed to the hanhot' mill waS 2\ limes as eoarse as that sent to Ilaniian's Star. As it was demonstrated, in tests earrieil (JUt at the former mine, that eoarse sand lunl a had ef- feet on luhe-mill work, this faet, takinj,' the size of the two tulie-iiiills into aeeount . explains most of the dit'ferenee in output. As 'slime' I 'I in the return feeil is the ])roduet that worries Mr. James so niueh. 1 ijne liilow tln' ^'radini,' from the Iwci tuhe- mills: Hannan's Star null Ivanlioc tiilif-iinll (llil't.i :;(iS tons per day. (Kfft.l 1 4.' tons per day . heinj; orijjinal feed and liehi;,' iiriy;uial feed and sand retunied for re- sand rvtunied for re jjnndiny. ^'rindinj,'. ' ; Tons. ' ; Tons. On 40 mL■^ll 4 .-> IJ ()(i 11 40 Iti 1",» tilt !) .-> IT) 4(1 14 OS L'l L'7 " HUl ■ i<» !( .->:{ :j:{ ud (m :>:.' 4.i l.")() 1!) (» .")(). <»J 17 77 2.') L';{ Through l.-,() " 47 1 l-'6 2'.' 18 i»l 26 8.') A ^danee at the above figures shows that the Hannan's Star mill with an orij,'inal output of 38 tons of - 'loO-mesh slime per day contained in its return feed no less than 47',', or r2() tons of this same ohjeetionable product , against the Ivanhoe mill with an nrnriri'il r»iitT»iit e>f 10 r\ t i-it-i c /^<-.n t n ini*^ I,, ,1,.. admirati-M, ,,t ,l„ „„n,n..' «„rl,| , x,- <-uim« a ,.,„!, .1.1, s,„„,rsauli. an.J .. ,,,.1, „„),>,■.' ,1,. ,„l„.-nnll I.rariuv ,,„ a .u,,l,|„,r,„.. umu-. wl,..„ ,.n Ins -nvn sh.nv.nK this '^'>'>r „„11 ,. ,1,.,,,., tar !,.,,„. ,v„,k. ,.s,Knallv as far as rlran s,.,,- an.t.un K.vs. than ,1„ ,„,. l,.- ,s „, ,,r,.„.l ,„ I, „ „nl.,n„na.. that Mr. jam.s has all.,u, ,1 ,„.vs„„al t.. in,.^s „, ol.Mur. lus ,...!«- ""■"'"" •I"'* -xvasi-M,, an.l ,r 1„. ,„,u puts th,. Hannan's' Star "Hll liuur.sin .1,.. pla.vnt ,1„. hanh.,.. ,, ,s . vM. m ,n what a„ untnriiinatr i...Mii.,n W- ha. pla,,,] hiniMlf, A. It is lianllv iunv>sa,v in (■..nniunt anv turilur nn this ur will nnvv i^u „n to aiv.lluM- paia-rapl, ,„ il„. pap, y ,„,1, r r ' vuw wh.r>. cn„,p|a,„t is „,a,l,. that llu- pans ,.p.,,allv ,h.^ inM om-ha.l a„ ,M,.1,„ ,,.Kanta,,-r .,v, r ll„. ,„l„-,n,ll ,n nialhr of Jjcttin.: n,i ,,, ,„„sh,.,l pn„h..i. Sunk Mr. |ain, . ,1,, . „,.t ,,,„- •■ l'"l n,,,, a srrun.l ,,, 1,.. .!,„,., 1, This 'V'!'" ;" ""■ ^"'^'""^'^'^ "f I'^'"> "vcr iul.,-„nlK. a. ,„ ih,- ca.. " 'I'^J.-'tNT..-,. ma. Inn,, ha. I,.l„„h r,.,l,uv r,,ar... san.l an,] ,1,, ho shn,,,,... as uvll II„uvv,T. ,1 Mr. ian„ . ha,l l,„,k,,l a, , h. frr,] vnunw. Ih. s...,,„,l ,„ ,„nsh„„ pa,i h,. u,n,l,l ... ,ha, ,„„ "1 a'latlv i,,„„a^.. „1 7t.i,,,„. ,vt„rn,.,l ,,,,h,. pan i.,,!,.. ,han '\''''-"''' '■■" '"'-^l' ''-'"'^' 'imr ,.>„s „„„■,, ihaii ,is a,.,nal "'"I"" "t 11,,. pr,„l;,.l.. ,„•. ,,, ,„,„ r u,.r.l., , |„ , • ,, , .11,1. |Mii nan prar- uallvih.. satn.. ,p,ahlv,.|i,...,la.,h.. t nlu-nnll. -,, , hat l„„h w,,v ';''""'"'^ "'"''■'■ ""■ ^^""- ■H^a.hanla..... It niav 1„. .,,n.,,l„v' t,, ""■ -'""-"'■•'" I" M'-ti-n that all tnh.-nnll. an,l pans ..rnt.'l.n.' '" '' "'"'"■ " ^'"l'-' ""■ 'harartrrisi,,. n| ha- ,n, n„.r,. l.-.O Mnn."^ '','■.'"""'""' '" ""■'" "'••'" '-^ """• •■"■•^■^'1 ■""!■>" "f ih,. pr.,l„,, ''"'!' '-'^'--I'i-v.tlK.n.sul, .„•„,„ hav,n,a,,r,.p..r,]..,nnt„.n "I "1'^" .-n.,,tut.s slnn,.,an,l a h.^ttrr plan f.,r ..parat „ ,n nf , , sanir. .Vnni.n.ns atlmipt. havc' l,rrn ina.!,- ,,f lair i,, .hf,,,, "■''"' ^'"'"' "■ '"" -' '■^"- ""■ 'vsult. hav. n„t l„vn sa.,.ta..t,.rv '■ '■"""""" '""' P'-a..t..'al .l.f,nn„.n at KalL;n,,rl„. ,.■ \11 ,hal !;;"''"',' "■'"'■'' ''^'^^''^ ^' -■■•-■•'" i'av.n^ l-U h.,1,.. p.,- h.u-ar ,„d, ^'"f' '^""■;:^"'''-' - f^"- '■■•■"" ■:attshu.t,.rv. f„r au^un. r„nv,-rsant w„h unn.hn., pra.,,.-. k„nw. h.nv lar.;.. ,s ,h,. quaninv uf v.rv fin,, san.l that will pass a |-()-„„..h r.a.Hlv. l,u, ,s ..t hravv inou,.i u, sink m a sint/kastrn, an,l !,r rrinrn,,! t./.i,.. ,„,„: ( ilA //>/■, I'h: U / /( /• .1 / K \l.i,iii>l M-m/in- i||,s.- diith uImi -. it Aa> slati-.l at tlif nutMt nl tlir |\anlii., I \|i. riimii!-- thai all tlial piu.liut wliuli passi-.l a l-Mlinr-h \\..nM l.r ralKl Mimr,' \\Iii ihrr II rann iVimi a uil.r mill "v >4riniliii_i,' pan As ^uiiir li;i>is ''■I'l 1" 1"' iiia'lr i,<\- ■ i'iii|Mris,,n. this was ilmui'lil \n \,v tin laircst nii'l tli.^ I-. inrnc'il slmir whirh > auscs Mr [atiirs mi tmu li \\ nuul, >l,an:.r, a„,l alsn th. fact tl.a, ,!,. pr.„lun rntrnn^ tl,. '» — n.ill> n„ ,h. Ran,l ,s o.avs.r „„ a..,,unl ,,f „ ,„-a.,i.all v l.nir havr a la,-. ,,.T.vnta-r nf ,.r,u,nal U-,.! ,vtum-,l auani'^tn.l ^;'-^'^""- ""'' '" '■■'"-'It"-n>v ,lu. .-,.,.1 rntrnn,. ,h,.n ,. „uu-h t,m>, Ann, UT prruhar .„-.u,ii.,anr,. ,s ll,a,. wl,,!. i, „ ,l,l„c-lt n„ ,]„■ „;""' '" '""' ^' •"'-""" "'„K.,- L'L' .,. ,„ k.„.,i,, ,„ ,,!,. who!,. „t WcMrn, Aus,,-al,a tin,-,. ,. nu „„li ,„,,■ Hi „.. ,1,. ,„a,nntv h.in;; A ii,-ar,ual |,nH,i ,,i ,1,,. rst.Mn ,„ u ln> h -^vm.luv^ pan. a,T ';;,!'' •:•'':" ^'''"•" -"" ^"•>' "- '■"^a^..,i ,„ w,.,..,-,; Aus„-ai,a, ;* ■ "' """ ""''' '" .^nn.liTi- ,-aw sa,„l, adiiiiitr-llv ,i,„ , a sl„iu- ""■ 'l-^'- n,„u-s wlnrh a,T sl„n,„,. tl,,.,,- „„al pr,„lurt ha.l tul,r- "HIN rr...,ol nr un n,-,!,-,- !,rt.„v ,iu- rr„,a,-kal,K. ^^rnvluv^ a!nl,tv "' I'ans «-a. n.n^um.l: \>m whcTr i, l,as l.r.-n ,kT„i,.,l ,„ mcTa.c '!>'■ 'apa.nv ol th.s. laltr,- plants, pans hav. ,nva,-,al,lv l.c-.n ,n- sta l.Ml ,n prrt, ,-..n.v. It ,s p.,-ha,,s w,„-tl,v „f nniux. that alM.u, a .i'.A-n havr a1s„ a,T,v,.,l ,„■ a,v .,n ll„.„- wav t,. Sn„,l, Atnra it ,s a tnattrr „f s,n...,^. pl,.as„,v ,„ ,h,,s,. ,-..pnns,l,K. if ,„ '"■ ^'""''■'' '''-'■'''■ '•''' ■n>-'vas..,l us. of ^nn,l,n.r pans ha> l,cvn •!"-■ ';■ '1'- Ivanhn. .xpc.rmvms, and al>n tlv ,v...,n„n.n.ia,„m '■■ """""'" "t a .^nn,l,n,^r marhinr ,hat (,„ us. M,-. |a,n.s' nun x\nnis: ha- thr a.lvan,a-c.s uv.,- tul„-,inlls ni -u.uv' l.ss l„„-s.- I"^^^';'- !'<''■ "">,. t!,r,r ..vatrr runvvnuna. ,n w<,rk,n-, th.„- .apac- .•V t,„- amal^an,a,,un. , lu- ^,-anula,- ,h natu.v „f tluM,- pn.lu.t '• 7' '',"'" '"■ "''''"' '"""' '•-■"">'.s,,-at.,l u,lu.,-w,s.. ,!,.„■ un- ''""'"'■;' ^"l-'-'-nlv ,n l„vak,n^ ,l,nvn o,ar.. sand, and tlu^.r nior. than .(jua! su('rt wlmh \nu kiii'lK' st-nt nif an aiix'aiirc jirMof. 1 niitiLi- that in -^iiiti.- nt tlir sjiaci at his ounnnaiiil Mr. Hrilt cised me .-u las'orahh' that wei'e 1 la\in>j; (hiwn an instaUation of pans I sliould deem invsidf fortunate if aMe to seeure the ser\iees of Mr. Bfelt tor tliis purpose so elfieietllh' ha\'e tile pans Ik in worked at his late null ;it Kali,'(.)orlie. All Rl".l) j.\Ml.s. London. I )eeemln r .". I'ROC.RKSS IX CVAXIDATIOX DrRlXc. I<,().; I^ Ai :i> AMi;s .p .11 . ,11 ; ; .1 I ; ( J, r, ":;':"" ''""'■':"'^"^"' "'>! — ..,.„, ,n,.van„la„„„,lunn,,lu. ::';,;;;-;;'''''''^- ''•■--". -^ll-n..,w„,n.,.a^,u.v.,,;;;:: ;',",""':; "^"" 'l"-— -^'nn. ,„..„...„ has , , V """■^"" •^■•'■^"'■'- Pn.n.„u.,u.,., an,l a. s,a„,l l,v , ' v"" ^"""' '" '">'■ l^'-"-' nu.,all„r„s,. hav. 1,..,,, a,- ;;""'"' "• 'i>'"-I' or- nu.I„,!,n, .,.,,.,„,, „,„,, a„,„„„nv- ;: ' \;" '■^■"'■■^'"•:- ^'■"' >-upnf..rous ,a,Hn, an,l ,„ .rush.n^, ruast- "^- ;"".' ':""^-''^-"i^ "V a,v ah,.a,i ..t la.t vvar's ,,ra,mv ' " -^ ■"t.,vs„n^ ,., n,„„ i„,„- ,„,. ,v.ai,„vn, nf .„|,1 ,„-,sl,as "'''"''•'' '^■^'""'^' '™""' -'-'"utv a ,u,.l„„l „,a,, ,n :"" 'f^' " ""^""^ >-l.lnn,lu„u: n,a.t,n, a„.l ,1,. „1,1 pat,,, -- nrt,K.,,va,nu.„, ,,f.,Uv,-.,,vs. C.pp.,- ,„v ,„ ClnK. ,s n-M...n,M..adu.,l,narvan„l.. plan, ..,,l,uu, .van>,l. an,l,h,. ■;";■" '■'?"■'■■ "' ^"^■'■•■^^•"'1^- mtn.huv.i ,n Aus.raha fur ^,,1,1 ,;;;^^;^'';-' ->''''- ''"-.n-n,lus,n- ,,.,., ,u., ■,..,„,,/.,„. '";''■ '•^''-'''--™ ta,l,„l,.s,au.kl,v ,lu. wav ;':: :•''''• ^^^':^--"'^'''''-'-l>^n.,...,, a. A,..all,Ma,-r^^ ;:-,;;;:; ^;;>;'--'--,,..nannu.,,:.n.p.^ , ">'l-'>'-'l'v •■M-n. a l,n,,.r on anv „„. pan „f,i„. ,vn,-M <;"s'.nat.,i ,„ ,,il„,, .,,u„,n..s apprar ,„ 1,. „„„-.. ,,„..kh- -.ut •-, ;,';!';; ^;!"!"'": "y""^!' "':; "!'"; "■ """■ » ---"^ '- '- '!>.■ ,..^ ;:wi,;iKn;. i-|,.i,aiiiy tiir cniulatiiin arising trnin /7\Mo7v7->> /.\- ( WWIDATIHX /^TAVAV; iiiiMi, 107 till' u]i-i(i-ilatc nirtliMils of thr leading' firm nf niiiiint; iTiLjinccrs im tlir uiir liainl, and inilr]H'ti chietlv husi d itsclt with tul.e-mills and slinie treatnieiit. Ar-;all. 15..s(]ui. Huttd's, and Merrill l^n/e all I.een cotitriljutiiiL,' to our aiKancenieiit ii\- i;ettin- out iin- lirove.l methods. In Africa the luililication of the rc-ults oli- taincd hv the l.rotlu'rs Denny at the Mever iV Charlton an liitjelow breaker, of the Klakc tvpe l.ut with the pit- man workin.u in eomjiression and having its weiijht assistin.i,' tlu- crusliini; stroke, appears to he rei)lacint; the other kinds at F\ali,'oor- he. and to show a lower runnin.t: cost than citlier the -vratorv or the older ri'ciprocatinj; patterns. Stamps of 1. .-)!)() 111. wei,t,dit are now in use ,,n the Rand, and it looks as if the limit of wei,<,dit had not \ et heen reached. But little has hem heard this year of anvil Iilocks lor tnortars. altliou.L'h at tlie Waihi (irand Junction ihey seem to have made for a con- MIS AV-.VAAy ( WW/DI-: /'AM( //( /■: M.lrraM.- innvaM' in nutpiit hcvmi.! tliat orii^inallv rxprrtr,!. Ju.i,-in- \,y .nit-put ]..st of .Irv-.TUslnn- at thr Soiitli Kal-u.li appears to ],v aliout tlnxr shillin-s per ton as a-ainst roir^'lih- Is |l,i. ;,er ton rrushini,' w,t at the ( )n.va-Hro\vnli.ll, l.akc \-i\w. and Ivaniior. On tlu' other han.l the latter erush throu-j, v.^-v inu.li eoarser screen. n- iKI, 17, an.] l.", ni. sh. resp,.,-,, vely ^ re.luun,.; the over- size(| proihi.t 1,\- iheir pans and tulie-mills. l-nu- (.nudnu:. The tende.iev has l.^vn to use .lamps tor rou-h erushin.L,' only, that i^. to M.hstuute eoarser sereens tor those lormerly m u^e. an.] tn-m the pulp to .,.,,. rate the c'oarse pn.luet an.l to .^rin.l it m tuhe-imlls or pans. There- haxc heen no notahle • ontnl.utions to ,,ur knov, le.l-e this y^-ar as to wlneh is the hest appliance for this purp.^se. Tul.e-imlls seem to !„■ -enerallv em- plove.i. except at Kal-oorlie. where I he n.aMe. 1 ore can he etfieientlv ground to the reipure.l luieness m ],ans. .\.„ ,l,at pans are not effective .,n raw ore On the coi,trar\-, the Ivanhoe results show verv -oo,l work imlee.l. and it is ;,, 1„- m,uh ix-retted that the comparative tests ma.Ie at that mine hetween j.ans and tul.e- mills were carried out m such a wa\- as to make the results worse than useless. Hut it is a matter for -erious thou-ht that the Ivan- hoe costs for re-.-nndin- sand sh.ould he onh- std. prr ton treate.I when the Orova-Hrownhill. Lake View, and other mills should >how a h-ure twiee as hi,uh. It cannot well l,e a matter of pans onlv. or we sh.iuld have heard of similar l<,w result,, from tile other comi.anies exclusively emplovm- pans lat the Oroya and Lake \iew pans are used m cnjunetion with tuhe-millsi. Is it that the Ivanhoe otv is s,,fter or that the linal product is not slimed as «ne.' The mana.^enient has ivcntlv heiii ver\- k.en on re.lucin.i,' the value in their residue and ha\e s„o cede,! in doin.i,' so matiri- allv and one would therefore expect that they would not over- look the Kain from erushini,' as tine as their nei-hl.ors. It is to !.e assumed, iheretore. that the erushm- is as hue. hut the fact remains that the cost of ,-rindim; sand at the Ivanhoe is less than hall that of neii^dihorin.L; companies of the- same ,t;n.up that emp.Iov wet crushin-. There is an ohvious need of thai careful compara- tive test I.etween pans and tuht-mills h,r which I have .so often ■"'"'"■■' •''■'"' "''''^ i' i ii'cci uouid in undertaken 1,'V Klu^; or /'/\(v;a7-,sn /.v ( v.iA7/^r/7i'.\ priaxi; looti !!»',» iJrnnv. IiKiiTiJ. it \va^ uii'lciNt 1 lliat the latUT was making :h tests, hut nothii st'i'Tiis tu Iiavc (lime of tiifiii. Meanwhile I atii informal that surh a tolidate(i (lold I-'ields, tnade earetui tests on manijanese sticl liners as a,i,'ainst silex with the result that the former were shown to he iiior/ expensive and the ,L;rindin,L; nothinj,; like as tjood, owini,' to I lu: slippinj,' of the jiehhles caused hy the polished surface of the man<,'anese steel. At l-;i Oro. a 2l)-ft. mill with 7\ tons of pehhles j^'rinds I-'.") tons ptr day of sand for tio h.p, to sueh a tintiiess that DO'; will pass KlO-inesh and .")()', a L'DO-mesh screen. At Waihi, an h^-ft, null ,<,'rinils 77 tons of L'O-mesh sand \>rr dav. so that (tH'f, will [lass l.")()-mesh, for liTk h,p. The Waihi is notorious for the hardness of its ore. which hall mills failed to tjrind ,;atisfaetorilv. Their tuhe-mills do not ajjpear to he run to their utmost c apacitv, hut their fiLjures are interestiuL,' as an example in ]iraitiee of direct tuho mill work, that is. without an\- rt'turn of material treated. The ahove tiijures, <,if over two tons slii-ied ]wr horse-power, at first si,i:;ht show a less duty than that mentioned h\- me a year ago. of four tons per horse'])ower in Africa, hut it must he reincinhered that the African crushiiit,' was much coarser. the\- havinj,' at that time a , i ii ii i jiei \ear accruini,; to the I':i Oro ('omi)any from tliis source. At Waihi three IS-ft. 200 /,an,ps iKnv in..n..s,.,l ,h. ,„„,,„ ^,„,„ ..,., ,„„^ ""r"'-': ''>: ^"'' -'"l-v hav,. „„p,.„v,„, .„.. ..„a.U, , ""■-^ "'"' ^"^" ''-' -- tlu. a,l,,,„„„ ,„ ,„h.-„„lN ,lu. .I.ne - "''-■I-n-abI.-an,l,lu.,n,M--,,n.s.,har,..s,ak,.I,.., „„.,,,,, 7'^''''7'-7''-^'---'Pns....an„,,u.,!,.aMvnh:;n-, ,,,r. '"""■ "■•'" '"■""■- •'•'>•■ -- '^-■•■v lnnn.s, ,„a,l,. „n „,: " " "■'■"";":'''""^'^"'"'"--"'""-suIt,„a,n.a, >av,„, „f '„., ""■^ "",""'""■'"■' ^"'- ""••-"■M„nn,. ,s.,a„.,l,:iaM f., r' ' "\ '"■" ''^'>" ^''- " '• li--vv .nak.s a „va, ,„.„,. ,.f -■n,i„s „„,,. as n,u.,, asp, ..n,l,..s,, as ,,,,.,:,,,,,,.,,, !-''''l^-.an,il,as,„,„H.u.l!„s,l„n,-s,.M.,Uvtth,saN,. .,.Ioha„n.slnn-,AIr.\V, R I -„.!,„, .„,,,,,,.„,„ „,., ,,,,,,,^,,^. '" '''''''''''''''■''■-l-'-a....n,„,h.sa„.i,.,l...,v-,n,,,„,, „•.,„, ,1,;. slniir ui tilt' mi I-,,„l,, aii.l {,„■ I-,., .,,;„,. ,i, ■ •MS 7"' ''"'"" ''''^"'''"' "^-'— 't ,h,. R„l,„,.,„ „V' , "■' '""■"" ■"'"''"•■ ""'■'"^'■'-^ iL'.l.iwt,, „„u after 7''" ''•'7'"^'':7'"^ ■'-'•-'•' an „..n.as.,N^ t- n.r,n„„,h. ll-H.ks,..,n„,„H. ,„a,M,t,.,„,.,„,;,n..r.as.,i "•tP»t '--"H.n, „..,„ „„. u,lH.-„„Iis. slKUv an a.l,Ii„„nal ,,n„it ;" "-'.""'-tols. O,l.,.rto„,,s,at the Rola„s.,n, 1. ^,i a, the -m.,nn r.suln„. rn,„, ,lH. „,, n.as..,l .x,,aetiun, whieh has K.s..,u.,l '■"''"-'" !'^" '■^■^■''- ''>• ^''-t half a pennvwe„h, There n.n..u.,stul,e-,n„,satu„,.k„nth,. Ra„,l and tnor. „„ „r.ier- ; -«^..en.„t„„nes.an.l,hese5St„,..sat,he.4n„n.^^ n^r .s.,1 tlu. amalua„,at>,.n returns .,f the whole .,f ,1,.. Ra„,i l,v tnrei' [HI' i-eiit. At present the Kni.hfs Deep appears to have the h„hest '""""'■>■ '-'put per stamp for eompU,.. ,,,,UTV - of 7 ,iS tons per stamp, s.n.e reduee,! hy the ..l,st,t ut.on of different screening tj; ...N tons. In \\,,tern Austraha the ( )rova-Hn,wnlnll eruslus ' . '.ns per stamp through a U.-nush sereen. and the (ireat FtnKall . ..nih, s,an,ps. exh,l„tsan average duty of seven tons per -4 hours through a H^ ntesh serwn, and the Sons of (iwalu at j-nora ,.,.,,0 1,,. statt^ps, treats ,i,,ls ,„ns per hea.i per dav throu.-h ■_',t-niesh sereenin.s.;. It is estimated that, in ad.iition to th,. aain- ;i!re:..!v ,„..„-;,,,,^.! as resulting; in Afriea from the use of tulie-mills. there i-.- a sa\mt; J'Kih;r!-:.^\ !\ ( wwiDA rii)\ pi-r/x li 1 !»(,)(>. .'01 of :',[)'■ , ill criuijuiK lit ,iri>iiiL; frnm the ailojiiion nf tln-ni in pi place of ir iiurcMseil niunber \' aiiials/aination I' (/litaimiiL; the sairic nitput ]>y the addition nf t! of stani[N lui t'S'-a'-x- .l'/; //i' (/);.///.';;. 'r:,c increase. 1 extraction h rcMtltm-^ from tlie use i.f tulie-niills. has \,vvn referred to already. At Wailn. amalgamation is earrie(l (,iit (hort<'r jdates. bm pmbablv the In'Mer method would be to exeludf eoppcr plates from the amah^'amation ajiparatus. At the Lake \'ie\v I Kal'^n)orlie-, for instance, ].lates are discarded and amal-amaii.in takes plaee in i^ans; in that mill .")!', ' (,f the value of the eonceiitrate is rei'ovcred by amalgamation and AO^}, by subscpii'iit eyanidation. A','j>//;;t.c Thomas l-^b.ards has increased the capacity of his nvcnt furnaces by a parallel svsteni of rabbles, wliieh is stat.d to promote int.r-rabb'in-. (',. C. Klu- has adojUed this lor the Hoh loff-Wc they furna.es at the Perseverance, and claims liiRh results. Mcrton has also modified his furnaec bv making it a five-hearth roastrr, and als.i of greater hearth-area. The- great Houlder Proprietary has a masting cost of 2s. :!d. prrtiiii (emi. loving ^lerton lurnaces* rediuiii!.,' an ore i..'oing A to .">' , suljihur down to fl()7', sulphur, as sulphide; with this I'xcc'ption the record of the Soutli Kali;urli t}pe of Mrrton furnaces d.ics not yet appear to ha\e been impi-o\-rd ,,n, ,'it]ier for cost (L's (id. j.er ton roasted), output i:{2 tons ,».,• diem for sniall-sizi- furnace, taking IJ h.p.), or ethei.'ncy i:;.l', sulj.hur down to O.op, sulphur as sulphide; one ton of green w 1 roasting 11 tons of orec With regard to the suggestion that I made in this review a \ear ago of adding, sav. two pounds of lead acetate per agitator charge i-lO to tiO tons) ot roaste.l ore. Ricliard Hamilton <.f the (;reat J^)ulder finds that the use ot lead salts apjiears tt) result in an increased ron- sumption of zinc in the precipitation boxes, as against which lie benetits l,v a saving of ro.asting iuvl. an increased tonnage through till' mill for the same labor, a re.luclion in the value of the 'Siuilh A; I t''in Min,-s, Oitiitpt-r J". HMH L'(»_' KhA i:\r ()-.\\ //)/■: /'/,■ \( //(/,■ U'M.lur. ;ui.l aLi.rnril fc rim- , f c nnh.Kn. .■ in 1 Ik al.ilit v to >ct fnul roa-ls ai; ii-l,t ,|ui. kl\ in ^, it,. ,,t ll,„ lual lo,,, ,„ naUira: draft ' ■""•■""■'"'"" Til.'; a;.|,..a,x m 1„, „.. u,-,,,, .-..ivancv ma.ir tins y, ar m thr rn,u v„t rail, .n of .,,1,1 .„■... Tl,.' ,liriirultv rnnaiiis '''■'• ''" ^""■"il'' I" ,,.ii fnmi an "iv ua\,'. a tailni- pra,1uall\ a> ivfra,t,.rv a-~ the ,,nL;,nal ort\ '' "■■'-" l"'I''''l 'liat (mr vlnnin,- an,l tlir W.Hlcv slinir-tahle nuylit ,:^vvr..mr tlij. .liihrnhv. l.ut the lait.r tnarliinc is l.v no means p.-ri.-.t an.l niauurnan.,' is a ni,.st f,irnii,laMf itrm.' S,, tar tlu' ,,M wmxas tal.l.s ,,r franus appear t,, ,^ivr tlu' hcst results. l,ut the ,,..t ot wasliin- ,l,,u-n is very hraw m.lrr.l anvumtinj; 111 crrtain rases t,. .'iOs. ,,r Ids jur ton ,.f ,,.neentrate i,r,„luoe /A ( )A.\/n.\ n,>.\ Dl lt as ahovr. a,M salts the rn,l ot thr roast, ati.l .hloruialc l5oth, im th nil' , rxtrai tions. l.ut ha\r the .Iraw ha. ml roast 111 L,'. >//->;<■ Inatuic,:! Thr hrothr;-. iKnny has.' ina.lf somrthintj ol a srnsation at jol,ann,sI,„r^ l.v t he ni,t ho.ls thrv liaNT applir.l at Ilinr luw plants. I„ th,M' tlu^y have a,l.,plr,i thr \\\m Austra- lian ni,tho,l ,,f cinulatin- .lilutc rvani.lr M.lutions throurr], tlu' null an.l tiltc'r-prrssin- tlinr sliinr in I),hnc hv.lraiilic-rlos, ruitcr- l"v.srs. Thry , jaiin a nvoxrry of osvr vani.l... hlt.r prrssm^:, an.l -lisposal of resi.luc '•■"' '• "' '" '"''■ I'^''" >"» As this .arrvuiK into j.ractirc of their I>ropose,l treatment srhenie was not effeete.l without manv proph- oeies ot failure, an.l as the ...st of the in.stallati..n necessary appears to I,,, less than half that <,f the nieth.,.1 of treatment I'Hally m v.n^uv. it is natural that their work shouM have receivc.l much attmtion, ,-„! as their ti-uivs ,1., not s.^em t.) I,.. seri..uslv conteste.l. the D.'nny l,r.,th.Ts ..■rlainly l,,.,k like scrniK heavilv ai,'ain as th.' result .,f th.^ir enterprise an.l toresi,i,'ht. just as thev did Iir.vK.usIv i,v the intr.„luc!i..n on tlu' Kan.i of tuhe-mills. Hut p.rhaps th,. tw., -reatest su.ress.s in slime treatment— as heuiK a real a.lvance .,n c.;tablishe.i filt.'r-pres.s pra.ticc- are tin- res[.e.tiv nu'tho.ls evolve.] i,v Ri,l,L,^wav at tlie BouMer an.l l.v Harry at Waihi. Anyon.. rea.lnii,^ .Mr K. Cilnian Brown's article- nr I hat la ajiptars ti i lie working; wit li c (]ii-,iil(ralilc sill I OS at V'uLiiiiia Cil \-. as i|mi s aNi > !■" I, Ir a \Tai' at thi- 'ircat I^)ulilrr. anil has trralnl smiif 1 himsaiuls nt tmis nf slinir i|iiitr aiitiiiiiat ii ally aiiil withmit any 1 1 uitiniinus supi r\ isii m, atiii Ilaniilliin, w hn has hmi trstin,:^' it alnn'_;siilr his liltcr-prrss itislallatii 111. i^ s< i satisin il with ihr ri'sulls that lir is la\ iiiu; iluwn a plant tu treat .")llll tuns pi r i lay the lav^cst slinir jilaiit m tin- snut li- crn iK'niisphriT. Thr pniiriplr nl' tin- ma, liinc is a miniln r nf liiiri/.iintal plali-s rr\i ihini,' rnuinl a i-mtral vrrtiral pnst, whirli is rrally a tiilir. anil tn whirli pipfs intiinnmiratinL; with rarli jilate arc attachcil. I^arh jilatc has an iiiiiiir hlti rini;- snrlaci.', atnl thniai.;!! a pnrtinn nl' its rr\i ijutii in it ilip- intn the slinu'-jiuli). A caki.' is I'lirninl liy the appliratii'ii nf a va^ mini, aiiil thr jilatf ill the ciiiirsc i.t' its jniiriu)- arminil its axis tiniN itscli' next in a wattT tiatli. wiirrc it rriiiains suTtn imtK' Imi'^' t'nr thiiniu^h washiiii,'. Till' rakr Is tlirn ilislml'^ril aut i >niat iral 1 y intu tlu' rcsiilni' drpnsit system This niai hinr is rrrtainh- rlu-aiiir than thr hlter-prrsscs. Iml h in tirst (list ami in uperat i' 'ii, and an eipiipnuiU tn iln ilu' ihit \' n| an Alriian ilceantatinii p,ant sliniiM nnt nnl\- xifhl IiIljIut ri'inxcries at a Inwa-r wnrkitiL;' rnsi , hut shnuM lie inst.ilk'il tnr less than halt' the expense n|' the exist in ^ s\steni. ( )t' the nther niethmls ret'erreil tn last _\ear Iml little has lu-eii hearil. ('. W. Merrill ajipears tn ln' still at \vnrk nn his lu'ilraulic cniptyiiiL; tilter-jiress. l.ul iletails nt' s\u eessuil wnrk haxa- imt x'et reaeheil me. Philip Ar'_;all has a tixeil frame ami iiin\al)le tank, but ajipears inn busy at C"rip]ile ("reek tn he alile tn i.;i\e mileh attentinii to his slinie-tilter I'nr the present. In Western Australia oiii' nf the i^'roups had a metliml nf iij)\varil pt'renlatinn nf the snhuinns tlirni.ii,'h tlu' slitm-piilp iluriiit,' a.u'itatioii. Itut this iiuihn.l ilns not apj-iar tn haw licen atteinled \\ith an\' '^reat sueeess. fieiieralK' s]ieakinur. it Innks as if smiio ilireet niethnil nf aiitnmatie almnspheric tiltratinn wnuM displace fmtli deeantation and Dehiie tilter-pressint:. althoiiL'h at the outset it will proIiaIil\' rei|nire a hiL;her di.\L,'ret' nf intellij^'enee for its etYoc- ti\'e and sui'eessful workim/. /■AVV,7v7'.ss /A rr l.\//M//()\- /y/A7,\V, \'M)i\ .>(),-> A'r ti,;itiih III ,./ lailii,.^ \,,i miu h li.is Ik cii sai^l of the Stark l'r.i.,-.s rluriiiL; the vcar It s.ci.i^ t.. Iia\,- Im.u i,,M,t i.n.tital.ly applicl tM tiir Cn.uri RrrI .lump 1, n il.at tlinv is aiiv s,,,, ial cliarartcnsti.' Iraturr of this ,lii:ii]i that inakis it suiial.lr tor t ho Stark prui CSS' Mn.itii, Ci.iniJr. A r.tVn nrc \,, a t,st hv liuitrrs, ,,ri ivl '>••'""■'■. nf a mrrru:-v salt a.l:i..l t., the ,\aiii>lr' s,,K,ii.,„, avails thr invcsti-aliMn iiia.lc l.\- the Ca-srl ii,ini.ati\- ithc unn.-i-s ,,f the <.i\iii'lr patrntsi in IMC, i„t., thr use ,,| liu. >alt. Th. \- d.taiifMl iiupo.vf.l .-('suits. ,„, snnir .,,vs. ,,f i)!', -,-..al.T .xlra.tit.n ..f tho «"M and :;' , ■4,vatrrr\trartiMii nt' thrsihrr, with a hiuvr , nn,„„i[,. tl'.Il nt , yani.lc. Imt the trsts UTI-r n..t runtinui.h as the illip.-,,\T,l cxtracliuns sitiiknI in-md, i,'iii ly cnmu.-a-in,- in \-ir\v .,(' the aM.li- liniial cxpciiM' ,,f ,!„■ a-M,-,l salt; hut Huttc-rs' trsis have ivncucl intcr.-t in. the -^tihjr. t. iti.l w r hop,, fur fuller .lata. ( •t W.St Australiar en-,ts will show t ii.' progress still In^m- made m that re-i.in l.y e-.inparisun with those in iirecclini,' papers, as well with thos,' chtainin^ elsewhere: A'l'. ,(-/)Viavn/i;. Mill. I.ake \-u.w h.lllll'.r , S'nilli K.il-urli ii|i-\ I.akr Vuw IvanliM,. Smith Kal.Liurli (ilr\ ' Coiifiilriiinii;. I.akr V,r»- 1\ luc. . 171 . I s? . .i.S'J Is. <),1. Is. <(,!. -'-.li.I. I\',inlicie ''■-■ "I. juT ton < ..11, rntratcd lid. pi r 1..I1 mille.l ■'^^- "d. per t..n e.mceiitratcMl ll'd. I'er t..n milled Ivlmh!^''" ^; '^;' '"■■■'"" '■""''':'' I >■""'■>;•" tratu only) Sinitli Kal.L;iirli _>>. II. I (Ireal H.nil.ler I'p'iMii'Iarv L's. 1.1. Fiiir (,'riihliin; SiiihL I. ale \'ie\v (all the lire) ^l- I'K \t 1 1( /•; Cxiitiidnt); hy .\t;italiitit. I„ikc Vifw As \<\. iituluili^ |v |,|. i,,r KCv .in.l Is. J,]. (,>r RrCv) '^•'"'i'"' '''■ 111. ("I'liiili-- IM. Klv, Js. till. Hrfv, ;m year, save oticf when it \\a^ iiii.l.i- j(l. 7'.i/ij/ / rcuiiu ill I'osts. I\-anliiu' !K. (1,1. Smit 11 Kal'jtirli , | | . :;,| (IrL'al Hi.!il,l, r I'r- '|,nii,ir\ , W-. tl,l. I'irrat l"ini;.il! r,,, I I, I. ■'^""- "I ''•>\.ilia . , . .-,, _.,! p,.r ,.,„ tr,M;,-l. ' -I nil. In.liiii; 11,1, |..r Ki '\- .111, 1 Iniir) I I I'l. nil, lii.lin- (1,1, |.,r Ki V .in,| Inn, 1 I , :■! 1 •, li'l. li, r !,in tiltiT iiri-"i'l. (n-u,-r,]l. 'I'lic l.attK- ,)1 tlu iirmrsscsat KalL;iiiiT-lii' i-; ii, iw ii\ it. Il i-^ adiiiittf.l iliat tile all roa^t iii'.,' pmcos u'ivrs the must |ip:tit- ahlr ixtra.liun. Imi ihc l;i^<''l i" 111' mill ,n„Msl',-,l ,,! .p.vlal st,rl ''''"'■' '''■'""" "• ''^' '- •"■ ■"■'■^' I'V -I,.' m, I, tln.k, u.tli a l,aM. ,„a.i.. -'thai tli.',ntnvli„in-was,,ii,ii,|,,lt,,|„.,„,,Tlu,kinL; Tlu-r platrs l''"l •' III' "f l"ur '.r tivr i.i.mths, l,„t a^ ,. nhru the eas.^ uith east- nius siil,|,rte.l t,, -riiulin- a, ti,,ii. .,,nir n\ them wuuM wear un- 'venly an.i .uvasinnallv <,>!,■ u,,„l,l ,ln,,, ,,ut n| phu.'. Thw lu-es- Mtatr.j sl,,ppin.,' the null an^l npla. ,n.^. tl„. I,„,sene.l plates. The nexi liiiin- us,.! uas ,n the f,.nn ni pi„e M,,, k> . ut from 4 I'V (, in. sau. .1 tnni.er inm (i in. len,i,Mlis. trinmie,! -^li-htlv we.h'e- -liape,! It.) all..u tnr eiirvatuiv <,\ shell,, an,] ,et .ai ,'n.| T., plaee a new set of these pin, M,,, k U,n'r.. ,n. lu-lm- reiii.,val .,| .,M |,|,,eks •■"-'1 sh.,velin.4 "in an.i ,n .,f th.. l,,a,l ,,f p,!,.,!,.,. ,v.|u,re.i usuallv ;''"'>" •!<■• Iiv. .The lul,e has ,,nlv ,,ne n,aii.h.,le, tli,^ , ,,ver ,,t uhieh IS sh.,wn u, the ph.,t.>L;rapli,, A set of tlu^se liners laMe.l fr.,n, 10 'lays t., tu,, weeks. Asi.le iV-.m Its sh,,rt life, this Imin.,. ha.l the 'lisa.lvania.^re (l,v reason,,) tlu> ve-etable .,ils e.mtame.l , ot inakin- a soapv mixture uith the alkalies present in the evani.'e solution u-rushni- hem- 'Lme ,n soluti'.m. This sa,M,nili.ation eause.l ex- fossive toamin- m the haltcnes an.l on the plates of the stamp-mill itnrafterL'o,n;Mhr.,u-hthezmel,oxest!iesoluti'.n wasn-stan.iar.l- ize.l an.l returne.l t.. the Lattery st.,ra,^-e vaf, an.l also in tlu' tuhe- niill, laun.lers. an.i vats in the eyani.le ,,Iant. After a U■^^■ sets yt the.se pme liners ha.l heen trie,], a similar set was m.-,,),. out -a' i-ioeKs ot mountain maho-anv, a ,]ense. hani woo.l from the Sierra Xi'varla mountains. This <,rave a few ,lavs lon,t,'er life, an.l the saponi- neation was ileereascd. i 20S lt sclci.tfil ]iii'ii'S (if rlialci'ilnnic ATin-stutV, \-(.'ry haril aii'l t li iM-i^rainc'l. f;-"iii tlir mine. This linini,' \\;i>^ rarcfulK- put in with iiMnlaiiil iriiiriit. aii.l tiuii allnwcl t' I >ct I'l '!• al luut lit (lays. In K-ss than Iialt" an hi nir al'ttr startinL; n|), the ]Mnin(Hn.L; ct thi' |iclililrs caiisril tin- Inunu to ln'rak. T'lis 'liasty tinish' was. at the tiiuv. iiui'Utol i.> the (pialitx "f thr ccnicnl uscil and til thi' fart that it was imt allnwiil I(ir.'.,'rr tn set. ^Ir. Unkkir's ( x]n-rirn(.f. In iwcxfr, slmws tliat it \va> nut alto'^ithiT due ti) sucli caii.si.'s. W'r next trinl silix lining; Imt while this did not take (|uitr as Iimu; tn phur and fur its rtini'nl tu set. a< did the quartz liniti;^. it did nut v^iNc as lun'^' a life as was expei ted. The silex lining, alMi. aeted siniilarl\- tn the first steel-plate lint.s used, ,L;i\in.!j; tniesen wear, with iieeasidiial dnip]iinL; mit nf Mocks. Then, it was deeided t'l try wrmtLrht-ir'in hars. s in. wide hv 1 in. thiek. a (|nantit\' of whirh were on hand. Iia\ ini;- lieeii used as enniUi'tin^' straps i ir ]ilates at the juints in t in- i ild I'urnish pump in the Lent shaft -s hcrii llic [i.Mrtifi- tci fiTct a separate r.jMiii tn: rlraniiiL,' and lux'ssins,' aiiial;,'aiii. aii.i tnr tn-atin.uaii\- ri.li piMduct, siu h as .lie sail. 1. el,,, an.l 1 tliiiik it IS still Timre im|Kirtant that a .-eparatr ■.■.».ni .ir tloo.- sIkhiM l,e set asiile tdi- till' eii,-.TsiHin.liii- "iH-vat ii ms in a i vani.le jjlam, as the lialiility of ' -es (u-enrriiv^ in hainlliiiL,' :^i>],\ sliiiie is imieh .ijreater than in liamllini,' aniali,'ain. 1 tlHi-eln.-e ]ir,)pns with llu> viewdf evokint^diseussion on tlu' suhjeet -tun loni; neijleetcil — so that the en,i,'im'ei-s who (lesii,Mi thes(> j.laiit^ tnav have a fairly 'It Unite i'lea of what is reallv re<)uireil. The elean-up floor sliouM have a ilrainai^'e separate from the rest of the cxtraetor-house floor, so that any wasliin,i,'s shall n..t lie eontaminate.l with oil and i;rease from the pumps, et<',, and m.iy hv run into a sump from wliieh the residue, after settlement, may he easily eolleited and imduded in the next elean-up. Means of trans]iort of the .L,'ol,ldiearin,'f zine, ete., from the extractor- boxes to the aiid-tul.s should he somewhat Letter than tli..se afforded hy the proverl.ial Kallir and a hath or law ket. .Much time and also lahor is wasted hy that metho.l. .\n overhead erawl with tipiiin'^' htiekets e.iuld, I im.ai^'inc-, \,v easily installed in most plants and waild -.. ., ,i, p;,y for itself l.y the savin.i,' of time and labor, not to mention the ileerease in liability of havin- -old sjinie aeei- dentally spilt on the extraetor-house floor, whenee it is ajit to be carried by the traffic to the outside of the huildin.i; and lost. The aeid-treatment plant is often totally in.:de.|ualr {,,r the proper dissolvint,' of the zine and insurii.i.ni allowance made for the washing of the .iiold sliiiie before li!tcr-pres>in-. I iin■ '"■ """'' """■'■ 'I'li'kly acrM,„,,lisl,r.l N.lu'H thf -..1,1 slinir is .Iraun tmin tlu' lM,ti,„„ „i thr washi„,i,r vat than whon tli, su. tiu„ tn.in thf hltcT-prcss i.unip is slun.i,' owr tlu' side <.f the vat. A> the ,l,'.>l,I sli.iir is.vn-y heavy, it is advisaliK- m us,- a .p.Tu.llv slmn l.n.^th Ml hose- for the tiltcT-i.rc.ss putnp suction. If. .vlu-n runnin- .1 -wn the char-OS from the aci.l treatment tubs, cvervthin- is pnt tl.P.ud. a tU-nicsh screen an.l the intents nf the xvashin-'^vat k.],! ni a.-itat!u„ while the press is hein.i,' tiPed. there is no ,l;m.'er nt th.- liMSe ovvr the suction .Irain-pipe l.ecmin.u' ehokcl. n.c use of niter ,.apers nver the cloths of the press is also to l.e reco„„„en.le.I. as hllin- is therehv facilitatcl and the lite ot the cloths ,s pro|o„,,.c,l. a^ no scruhl.in- is r.-,|uire.l to .lean them 111- liltvr-presses sui-plied have invariaMv. in m- experience tlK' opetnn.^r. ,„ „H. 1,„,|,„,. ,,,„„,,, ,^.,., ^.,,^,,_,,^ ^,^^^._^| ,^^^ J ^^.^^^ ■ '|nantUvoltusc,lmol,h„..^ ^and Mockm, the passages Hv havin- these ope„,„^.„l,.,l,,„ „,,i,., ,hc,,,n,l,nH-darea.i„afull press^ 'V'!'"''' ' ■ ^'■'''""' "'^"' ''^"" '"■ ""■ '■"'■'^ -I'anncI and with a ^h^ht increase ot area toward ,1„. ,„.,de of ,l,c frame., there will l.e less hahilHv '■Mheir,l,okin,candtheprc>s,„avl,cl,!!cdmal.out •!"', h'ss time ilian when tlic\- are left rou-h. For uashin^ the cakes while in the pre^s it is advis^Me to use iiot water, no, ,,„lv for its l,ctter wasl,in, ellect. l.u, also hecause '^''"'•^•"■^'"'■^'^'"""^ 'ry. cxendthcreisonKa laverof ..,M shme ,.„,,,.- papers, ,r cloth. .\ l« in ,al. ta-M< phucl , .Oer the' flue ot the calc.mn.u turnaee, if the latter is fairlv close at han-I so as to utilize the heat from the escaping ^ases, will ^enerallv l.e'p.uu,] eapalil,- ol -nin- enou,L;h hot water, it ts essential that a va, lar,,- en,.u,h „. take all the washes ';■""' '■';■ "-^'^'""^ ^^" ^'"'1 '1'- filter press 1„, ,„stalle,i. s. , ,I,at the washes may receive lurther trcalmc, l.cf,,,,. !„,„„ ,;„ w asti m to ,'■"'".;": '.'^'•■" •"""'' '" '"' !"■'--'=' "1 sohit.on in the acid washes^ I his is app.rcn.iv due „. , he presence of 1, v,lr, .cvani. ■•I'td. The m,.re completely the acid treatment ,s carrici' on, that IS. when no zinc is left undissol ve,l. ,]u- m,.re ,lanL;e, o| t;,ild l.ciiiL: rediss(,h ,.,1 h ic ;!,,.,.,.,■,,„,. -,.u-:. _ . .,,. .^ ,. ua-hm^s sl,.l„lv aci,l an.l then spnnkl.. /m.-'fume'over'ti,.''su;f;i'"' .'r there IS 212 ii-: 'AM( //(/•:. mi'anwhiU' krc]iin;4 tlic suliitinii aijitatiil. This should \iv ddni' t'aoh liiiii' a i harijr liuni the arid-tuKs is t ranstV'rrcil fur wasliiii^'. Aftrr the 1 li an lip i> oxer it is ail\i and si .;i(i i ■ ]ia(ki.d in air-tii,dit lases. as it oxiilizes readih' on exjiosure to the atniosjihere and is afterward, of eourse. useless for this j.urjxise. From li\e to si \en ]ioun(ls are sulfieieiit to treat washes amounting to ahout 1(11) tons. l"or taJNing otY the aeid washes from the washiiiL,' \'at it is nd\"isahle to Use a ileeanter. If the arm of 1 he ileeanter he paint eel ^\•hite, the operator ean si.'e at a glaliee whether the solution is I'lear enoUL;!i to draw o|f or not. The paint \\\\] last throui^di a elean-up and laii !»■ easih' renewed. The \vasliing-\-at mav ha\'e a false hottiuu of ei inent slopinj,' toward the outlet to eiiahle it to he more easil\- (leaned out. The eeillellt should lie painted over with P. Ov H. aeid-proof paint after eaeh eiean-np. If this is done it w ill show no sii^ns of wear. When t lie ]iaint is hein;,' a])plied it is as Well to keep an eye i m the jiers'in doini,' t he j"l), as I liax i' had a Kalfir o\ereonie with the fumes from the jiaint \\hen at work- on the hottom of a \ at K) ft. ileep. He (piieklv reeoxered on ht'ini; taken t" tlu' fresh air. Stirrini,' i,'ear tor the aeid-dissoh.im,' tuhs should he installed, hut the tiioiinn should ln> rexeiihle, as it is often fmind expedient i<> re\'ersr ; lu' direetion of stirritiL; in order to help the dissoh iiig of the zine and to free any whiili mav ha\a lolletti'd rouiid tlu'- upriL,'iit e.irrxdrr,^ t lie p.iddu s. Till-: MOORK AXD IJUTTl'RS FILTERS (Jamiar\ I _' ]!tli7 The I-Mitur: Sir The anidr by .Mr. .\utt< r .m thr .Mm., re tiher in vuur issue <>t Deeeinlier I") is lioth iiitii'est in- ami iiisi inu t i\-e. Tliere are. huue\-er, se\ eral serious errors in it whieh do an injusti( c ti- tlie Mutters (iher. ami which shuuM he edrreeted iiniiie(hatelv. In .hMUSMU.L,' a plant \<> treat .'!.")(l tons iil">linu'. as deseril.e.l 1,\ .Mr. Nutter, a eiiin]iari>(.n with the plant ereetei] iat .Millers, in .\e\a(la; for the Tdnopah enmpany, will l,e ni nnler. This [Gutters sliine- (ilter consists ol' _'l(i Uaxes. aiid wmild handle al.ont .'idd tons of the hilierty I^ell shine, and L'."il i leaws would ea,sil\- handle the null output ..I :;.-,() tons per da_\-. Sueh a plant would require instead of ri-ht 7dn. pumps as estiniat<-d l>y .Mr. .\mter. only on.' pump that word.l tran>t\r the puii> or watiT in ill nnnutes. It IS \er>- .hl'lieult I . . al.ulate eentritu,i,'al jiuni], eapai itie.s v. . .rkin;.^' on a material otsueh \arial>'' c unsisienee as slime, hut juik'im; from ])revious e.xperienee with different slimes a ',)-in, pump would he amply lari,'.': and as (Sdn. pumps are reL;ular]\- use.l to transler sand m dre.l-ini,', it is har.lly in or.ler to call a l»-in. ]iump "larije," or to L.iisi.ler it oi- its \al\-es .iitficult of operati.ui. The li-ht crane r iitione.l l,y Mr. Xutte- \\..uM not he neces- sary, as a h.alf-ton < haind.lo.k, with crawl. wouM h.m.lle the Butters K'axcs when such, han.llin,!.; lie..ame neeessarv, which, li>' till.' wa\-, won 111 lie r.ire, .\s rcLjar.ls the ; of the lar,i,'e quantity needed to fill .\Ir. .Nutter's (ilter-vats, whieh are not desitjiied as is the F.utters filter 1m, X, p. i.intain harelv i nou.ijh slime to c.i\er the leaves. Xeitlieris it ■■. fair jir. ,p(,sit r ;n t.i re.|uire that the .slime he pumped aj^^-iinst the nia.ximuin lie.el . ,f 1!) ft . when ;i pr.)perl\- .lesii^'ne.l plant. e\-en when huilt on level 1,'n.uii.i. i, i - a maximum lift of ID ft. and a r,iinimu-i of I) ft hi other W(,rds, one properle ciesijrned hox for L':>1) Butters lea\-.'S will contain ajiproxiniatelv 7.000 c;i. ft. instead of the L'MMIO , n. ft. eaj.acitv of the ei-h't tiltcr-vats that .Mr. Xutier consi.lers necessary. The use of such a iif>x woui.j make availahle t. water and slime storage the vats Khj i:.\ I ( ].\.\ini-_ I'h'A! I !( /•;. IMW tisci] I'.ir liltcriiv^ ;mil \\;i'-liin-. thus i .l,\-iatiiiu the tin-osuy "I iiist;illiii- till' twi. >tofa-i' tanks li- iiiniti. 'U^ Itisirail ■''■ tin- linn- ilnns luiiiL,' a-. t;i\i-n l'\- Mr Xuttrrin tlir ryilc- ..| ■.piTatii'iis, tlir twll,,\\ ji].^. HI the opiniMii <>f tlir writrr. wnuM in.m- marly a|ii.ru.-;imatr actual runiiiii'^ . . .iiilitiuiis : Operations. Loailinjr TninslVrnii!,' (tiltiT^i Milliny; with wati-r Wasliin;.; . DiM-liar^'iri),' TninsfiTriiiL' Miltcrsi T..ial . M....r lUltttTS. ButtlTS I'ravitv. 1 lir. I lir. 1 lir. In niin. ii'iilji 111 mill. , 1' nun. \i! Ill •■ ' .-, ■• 1 lir. I hr. I 1 hr. Ill mm. HI mm. Ill miii. Ill (I'uli.- 1(1 ■• 2 ■ - lir :iil niin. 2 hr. 40 niin. 2 hr. 1» niin. Witlmiit knowin- the iMii^liti. ,iis as tin-y vxi>t at tin- Lilnrtx Hell tliat wciuld iiitlurni'.' tlu' cost n( a liltcr insi.allatiMti. micI as lirrsciii arran,L;ciiu lit "t \ats ami l.-inks. ii...,\rr rr(]uir('il Ir. tlic MuMfr iiltrr. .1,'niuii.l ruutMur-. cir,. I am uual.ic t^ .arrv tlii- cmpari-iii |,, its ln-ical cnnclusiMn. wlirrcfurc il is imomjilclf .\ siatcimnt t'mm.Mr. .Xuitcr as t< i w li\- it wnuMimt 1,,. hcltrr '" i'lslall a properly .Irsi-md !iltcr-l,(.x : \\1;\- a '.^raxitx- plant ''""''' ""' !'>■ piaiTil; an. I why on,- ll-in. puni]) woiiM n.'t he sutli- cirnt, wiiuM sccni \n \,r in or.jcr. .M.\kK R. l.AMII. .Mexico ('it w I )c( ( iiiIk r L'J A SII'llox l)i:\'l(i-: i-oR R1-:m()\-|.\(; l-L()ATI.\(i MATKRIAL \'>\ i;i)UAkl) S. WlAKi) U"fl>nMry 2. l!lo7i TIk' d.vi.v- ,K-.rril.i-.l an.l illu.tr;it-.l in iliis artirlr was us^mI I'v lii<- writer in a mill in nnnluni Idali.. f. nrn.ra- partidrs ..f linatin- -..Irna fr.mi th.' ^urlarr ,,| tlv watrr in a Irm- \-.sl,ai.r.i l.-mk, .liMni.ulnu! ^'.u'hnr,] pnl,, t,, ,-, nnnil.rr ni \V,liky tal,K> and vaiiner. Ov, ii,:^ i,, t]„. manner ,,{ nnnm-. tli- mil'iin- .,ro o.ntam, .1 an rxtra-.nlinary anv.uni ,,1 w...,]. , aii^m- iimn' "than the u-ual trnuMe ,„ .t,,,,,,„,^. „,, ,,u,., ;„„, ,|.c;^in^- ih. nlll. s of the Uillliy tal.les. An examn,atiMn -i th,. Unatm- material showvdit to consist lar^'ely of fin,' I'it^ ..f wn,,,] t,, uhieh had a,lhere,l s.'aly pie.-es <.f -al, na : the adl,. si,,n ni tlv two hem- iM.ssihh- assisted hv a lihn ut -reas,. ,,n the w 1. The -ilena was rather rieher m -iiver tiian the re-ular run of e. .neentrate : tests with sil- ver-leaeliin.i; salts and an .xaminatiui, with the mier. ,se,,pr show- in- the ^inerease o«er t h- normal prnpurti-.n to he due to tetrah^'- 'h-ite. This miner.d wa-. in minnr aniotmt in the (.re as it eanie '" ''"■ "'•"■ 'li'- pn dominant sihvr mineral h, in- ar-eiitite.' A little L;al. na was |,,st hy -ivasv lh,|atioii. The undressed ore contained, lar-e amounts ..f >patliie in.„ and the tank-water was sh-htly acid. Apparentlv, the p.p lay, rs of the water m the tank weiv pcrleetiv clear hut the inseriiMn ..f ,- !,;i|ii,. !„,ard \\,,uld eaus- •■' '''■"■'-' '-'"'" '" '1^"" tip ''chind it. e.Mstantlv h, in- au-nienti'd and spreadm- .,ver the surfaee ,.t the wafr' The'-ak'na euuM readily he separated f n .m the wo. .d l.y a,-itatinn; at'ter shakin- a porti..n ol water an.l seum in a l.eakvr, th.- W.....1 w.niM rise to t'lie P>p an.l the -alena settle !,, i he l.otp.m The water fnini th.^ siphon was use.] to wa>li down the cn- centrate f-.rme.l l.v the vanmr.. (dean water was sear.e an.l It hems necessary to make a cnevntrate hi-h in ka.i. ,t was not possiMc to use the overllow water of the tank for sluiein- i.ui-pos. s The (.verll.nv of the tank cntaind a notew<,rthv ipiantitv of (ino matter, whieh was further settk-d on th,- l.,«vr n..or The ,levice, herewith illustrated, is su.L'K'cstiw ,.f a means of 216 /\7-.( i-:.\r ( r.i.v//'/-: /'AM( i /ri-: rcilvuiiiL; llu- \iiluiiir ni walrr lldwniL; tiir(iiiL;li a tank. The slinic aii'l sand tnati '1 in tlir null iniilci- ili-i u^'>ii in \\i it railuv In !■ troin rlavrv niatnr and tlir Mii-larr wau r hut a U-w hit iV.mi lin' Kcil end <>[ tlir tank was wyy nearly rlrar. Tlir di-viiv tlciatnl in the w.itrr almut twn-thirds the way iVuni the feed end {•> tlir (]\cr- llow end. Kut it would base Keen |Mi-,sil,|r 1,, ha\r placed it nuieh clos<.'r to the I'eed eiid of the tank and olitain water tVee from low- jjrade dime. i-"or the jan-jiose ot nuM\ ly i-enio\inL; eoniparati\el\- ciean water, a nuniherot the de\lei s ei uld ha\-e lieen used. The two lloat tanks sliould pfop, rl\- he made of thin sheet aluniiniiuii My lloats wife made of Xo. :;() sheet iron nea\il\- coated with liitumeil. At the top the sidi s are hent over a liea\-v wire, hellt to the shajie ot" the tank, to '^iv: stilhless. The riihher tuliini,' used was ; in. outside diameter, with walls ■' .,., in, thick. Tile tuhinj,' shoulil he t!nn \\all( d, so as not to inti rfere \\ith the free \-ertieal mo\ements re\-ented from mo\ in;,' from their jiositions l.y strini^s t'asteiicd from their jiomts to the nijiple pijie; they are not sIkjwii in the drawin.t;. The little -trijis of \\-ood from the Jioiius of the floats to the sides of tile tank are in the nature of hattles to cause the floating; material to coiuerLje toward tiie mushrooms and prewnt its jiassaire between the tloats and tlu^ sides of the tank, A similar strip floats liehind the mushrooms to prewnt llcjatini,' material from passing le,- them. I>l:Vh 1: ht>l< ll to tin- (.piratin- ll..Mr. \vlii,-ii ptTniits "iir mail t'l In at aliimM aiu" fmia'. r. 'I'lir laiua'; ilnis iint srviil t'> lirttriMralc, diu set lia\ iii;^ 1m ,11 in mv, i, <■ ..v, r \\\\, viars. The lime tiMil in lu ul rali/iiiL,' aiilitv a].].rars \n juMiLct llir IiIht. I'ii; -Mr Huttrrs Filti't Wlitii this takium rarli.Miatr a< < miiulatfs sutVirirntlv to delay "l"^:ati()iis. it i> n-mnved hv suhjcctini,' the leaves to a hath (if -", HCI. The filtef-hrx may he nia.ie either of wocl (,r iron, as may seem advisahle, (lept'ndine nii tlie !?>r.-!!itv :;i-;<-c f.-^-.A fr..\:^\-.l Where the site docs not permit of fillini; and emptyin,i,' the 2J(i A'Af /• \ / ( )■ \ \li>i; /'!,■ 1, //(/.;_ bv ,i;r.i\itv, th,- pull, I- 'ir>uiai.,l ,,ii.l i r.niM. nv.l 1,\ tl„. pump, rii.' vahis 111 siuh a system an- all pla,..l n.ar t lie piitiip ami , . .n- tr..llr.l liuDi tl„^ ..p.Tatini,' platl..ryn aln.-.r iiimtiMii, . 1 Tlir uaOi •'"■''">'' '"> 'I"' I'l'-'r i- ni'taMy p. rlr, I ati.i l^ mpl,s!i,.| l.v t lir 1I--1' I .| a iiiiniiinini m w ,iti r. •'^'•""' '-^ ""^^ '"iiiLr tnalr.l. result ill),' fmiii the inilliii- ..f '''"""^■''""■'■- ^'''"' '"' ^'"'iM 11. ii 1" p.Ksil.U.t.itr.al l.v.lr,aiilan..n, ■""' •'"' "''"'' •' lilt'T pass inslallati..n u,,„M lie iirMluliitiv.ly cxpin.Mvi'. as udl in Ursi cost as „, lain,,- an.! p<,ucr. This fijtf'r c-oml)inos th.- l.rst features of il„ .M,„„>-. H„tt,,s, aii.l Cassel patriits an.! v.ill 1,. il,,- nuans . ,t cxtraftinn pn-. i,,us i,,. ;al fr..,ii sliiur n,.t aiiana!,!,- f, trratnimt l,v anv ..ther nuth.-.l, as well as Inmi sand n..u tr.aiMl l,v p, n ,,],n ■■ m. l,ni uhieh will he Kround imirli tiiKT an.] treat,. 1 !,\- a,i;ilati.>n an.] tiltrati.>iL Till-: kii)(i\v.\\ mlti:r (Frl.niary H 10071 ■■Tliis invrnti'in i- .1. -i'^'iici! partii-ularly fur tr.atiin; -lime ruiitaitiin.LiK'ol'i i" sdhniim A trial tnacliiiu' was Iniih (,n the (Inat BouIcUt mitu'. at Kal^oorlir. atiri has hcen constantlv in oporation '•ill' 1 Jamtary. litdfl, 'I'liis inachuu' (.oiisist.- ui I _' iKii »a>l-ir(>ii tiltfriii^' frames (7'i. will, li arc in the form of si( tni-, ,,|' a nn-le. The frames arc onrruj^ated on their lunler surfaces, and to these eorru>,'atr.! sur- taees screens are atta(heer. lOOfi. ^S:^ ^'^"'^^^'^^^^^^^^P^^^^^^^^^W l-'iv. -7. I'hr Ri,l^;u,,v I'liirr, ////•. /\7/",ii.n hii.ii-.K. L'_':5 A nost of thnv valves {fi is iilaccd in tlic jnpcs l)et\vt'cn tlu' column and vuvh tilHT-fninic; ra.li of the tlir.v valves is auto- niaiually oiKi-alcd while tliv niailiiiiv is in iiK.tinn l,\- small roll- ers (l') passin.u over elevation-- ..n ..ne ..r ..th, rof tlie three traeks shown at (II'i ; the t,'ol,l solution is thus .lelivered int.. o,,,- , umpart- lUent of the eentral eohiinn throu-h one of the \al\-es, and tho wash solution into the other compart inent throu,i,'h another valve, thus jirovidinj,' for the two solutions licinir Wept sejiarate. A third pipe connects the third valve lat Ih with the i,,p ,,r cmipresse.l an- section of the column (at B\. an,l while the frame is j.assin-,' o\er the disehari^'e ehute this valve is automaticallv opened by its roller and a inilT of eonipresse.l air enters the (ilt'er-fraine and disi.laees the residue adherin.i; to the eloth; the residue falls through the discharjje ehute ( ]V , into a dump-truck. Each frame acts mdei.endently, having its o\\ n roller, set of valves, and eomu. lions with the central column; and each frame and its adjuncts f(jrin a • omplete self-acting unit. The aceomi)anvin.ir drawin- shows a single-plunder air-compressor (at C), sclf-.-ontained :nid driven l>y the machine itself; the compressed air can, in manv in-^tance,- lie supjilied conveniently fmin other sources. The machine re(|uires al.out '. h.p.. dnw.ion of the hands of a watch- \ ' pulley kryrd to the 1 . .p of the eenlnil colunm (at 5i, and makes one revolution per minute. The vacuum i. on the lilter-plate the whole imie It is immerse.l wheth.r in tli.- pulp ,.r in the solution wash, hach tllter-frame is i;{ .seconds in tlie pulp ifn.m H' to IP) seven .sccon^. Durin- thcpermd m which the irame ,s passin- fr,.m the pulp to ,h.. wasli. the vacuum is ,,n lor one ^.-cond unlv while the fnime is risin^r. and one secmdonly while it is descending into th, w,-isli, thus -ivm- the pulp adherin- t" til,' underside ,,f the frar.e at^ air-leachin- of tw,, secon,-'' dnrati..n. This period ,,f lea.hin- may he varied to .uit the par- ticular nature of the slime under treatment or the tliickncss to which, it has formed on tlidnth. uhich is u.uallv aho„t ,' of an nich. Tin- suppiv o-' pulp, wash-solution. .)r water'mto the annular tfouKhs. (/i'andC'i, i. reuulat.d l^v means of (l,,at-valves in the reccivmK ct>mpanments 1^'' an,! r/' ■ ti„. ,„,i,, ;.. i .• es, Hid Is dfi\-en dn the a ()-in. helt on ;t |_>dn. -"-• A'/-.( i:.\ r ( VIA //>/•; /'AM( //(/•:. scttlin.i,' h\- tlif iT\-..luliuii ,,r -mall ^.-ital-n's (lri\cii l>v a rope l'assHi-4 nuincl pnllrv- atta.lir.l i,, thru- -,],in'llrs. wliirli imijcct through glands aii.l -t unin,--l.n\rs in tin- lii,tt..in uf the n'. mcr (at £' ami A'' I. It,- Uy nuan- ni th.' ih.at \al\ c in tlir pulp- ivccivrr ((■;' I, tlic pulp -upj.ly is taken antntiiatiralK- innn the pipes thnniK'h whit-Ji the Ddmr pn-srs arr , liar.^cd , tlm-. in ,,n!ir to compare tlie etlieieney wf extvaition l.v tlie nuulune wilii that of the i.ressrs, a pnrti'.n ..| the -.-neral pnlp is taken as eaeli Dehne pri'ss is lilleil. Frotii IIS iM i.n,- t,,n of wa-h is um-.I per ton n\ ,lr\- slime. anil the resiihies w.iitam 1 1'l .m l's t,, :i:i' , mnistiire. and fruni ml to a traee <>{ KC\ and soluMe i,'old. The tonna,i,'e treated in 24 hours ami pi reenta.ije of moisture contained in the residues \arv accjr.lin- to the variations in the pulp. \\\:h dean ijuartz slime of ,-1 eonsistence of from l_' to W , .solid, and a fineness of al.out !i_" , throu.i;h a screen liaxiiiL; L'Dl) holes jier linear inch, and a \actnitn of 20 in., this machine will treat .V) tons ,.f dr\- blime ]ier 2 1 hom's. 'eaxin- a residual moisture of :;il per cent. "" •' ^lay 'iine the output will decrease to 2."> tons p.-r 2t hours, and the sidual moisture will imrease ;{.")', . A nial was made on the old h.-nterv slime, tlie ori-inal assav xalue was 7 dwt , the tjold in re-idue Is -r.. moisture in residue .■!.")' , , soluMc -old in residue ml: tliis was treated at the rate of 2.") ions p,-- 21 hours. ICa. h frame lias tour s.piare Let of tilterin- area and al.<.ut lis M|uar.' y.ird of elotli is u-ed to eoxer each frame. The life of a iloth on -hme trom the (Ireal Houldi-r roasted ore is ahoiit It days, or TOO tons of sHme for 'J ti s,| \d, of cloth. The \acuum pump has u piston -weep of so eu, ft, per min and, with a 20-in. \a, num. reijuires :;]. h p The niadhnc itself, without the self-ai tin.L; air-com[)ressor, reipiircs al.out l h p.. and allowin.t; 1 Ilji. for the a.^itators in the pnlp-trou-h 'and pulp- reeeiver, ,-ind lor friction in the connter--h,-ift . a total of ,", i, p. is re(|uircd to dri\-e the e<|uipnicnt de-cnli(d. As the m;i( liine is alisolutely automatie in its ,ntire opera- tion, no addition.al lal.or is employed in runniiv.,' it. Takin.- into consideration that this is the first machine ma.leof this pattern, the rcjiaifs and renewals have not heen ;il>normal. ////•: /\7/";ir.i\- i-iiji-.k. ■2-2r, T!u' wfirkiiv^ costs duriiii,' tln' last thri'c iiionths Ii.ixl- hien: rilti.r-i.l.iili. Hiirsc-]».uir Rc'iiairs and niuwals Tntal I'.n. ,-. (I :i I'lT lull _• I 1 (I :r7 " It lias l.rcii ini|i(issiliK' to sf>4i\'L;atr the lalHif cost on tliis iiKuliiiU' (iitlivr than thusr in(lu''iil in ripairs and reiivwalsi, as (luiiiiL; tlu' wliolr run anv sli-hi att'iiii'in nrccssarv. other tlian i;rfasin,L;. lia> liccn prrlnnnrd i,\- tiir shin Imiss on dut\-. The nu'lhod nf i .pc ratiiii; thr nKuhinc i, a> t'lllows: Tlic a.uitators in thr pulp c umpartnirnt i>\ the animlar trnn;^!) arc tirst set in niMiion, l.rin- ili-i\'-n indi pcndcntly of 1 he niaihinc; 1 he ]iuIp-conipartnicnt i-. hllcij tn nnrnial Iiac] with a'^itatcd pulp, and the wash-cninpartincnt with wash-SMluti' in The \aruuni ininip is . As liie action nf all the framo and their connec- tions IS similar, one only need he dcscrilied. Assumin- that a tramc has ju^t passcil o\ cr the dischartje chute and i- "ii the ele- vated portion of the traid<. it then descends an in. hue on the track to the normal le\el, and the cloth on tiie underside of the frame is immerse.l in tlu- psilp; at the same time, the L,'old solution \al\-e lat U is opened !,y a roller (at Ti runnin.L; up an incline on its track die and -imilarly to the action of the clcNatini,' rollers (at 7'i on tlie traik lat / . t h.us oprniii;^' dircit e,,micction lietw-ci-n the liltcr frame and the \ acuum which is maint.ainei in the centre column; tlu' \-acuu!n draws ik, li.|uid throuL;h the t-loih and lea\-es the solids adhcrim: t uuin t., n move, l.y air-dryui-. some of the moisture tn-m liie eake of sliniL (..mied on the underside of the cloth. When the diMharjie chute is reached. the wash valve closes, and the air-valve m connection with the upper fi..rti..n i/^) ,,f ,cntral ...lunin is opened, adniittin- , puff -I c-nipre^s, d air. which dislod.^^e. the cake fr.-ni llie cloth and precipitates It nif. the dischar-e chute i/^M u„dcr which a dutnp truck )s i.laccd t.. re.ei\e residues The cuniprc^M'd air rc,|uired at !!»■ tune oi ,1„. diMhar-e can l.e supplied in any usual wav ,,r by the s< It-contained arranijeinent shown in the .Irawin-^ at C. Till': BITTICRS l-ILTl-R (I'c'hniary Hi 1MIJ7 The K,litnr: Sir 111 a re, in minilxr of t lir I'kfss . M,-^ Maik R Lainh, "I ihr MmH-rsC.i., liasrriliriscla rnnii.ariv.ii [ nia^l. v of t lie .M-iore and Ihit UTS filters as ai.|ili,-,l to .on,lni,,ns at tlir Lilurty Hdl mill. .Mr. Lanili claims that my i ompaiison was imiust and unfair to ill.' Hiittcrs i.rorcss. and ,i;ors on to say that instead of the one 1 made, a comparison with the liiiiiers installation for the 'I'onopah .Minim; Co. at .Millers, .\e\-ada. would li.' in order Since rcadin,^' .Mr. Lanil/s article I have ..l.tained additional mtormation covering the jioints raised, and m the li-ht of that infor- mation 1 am forced to .iouht Mr. !. ami, 's data and ([iKstion liiscoii- <-lusions Mr. Laml. docs not state spe, ilieallv thai all of his .lata arc from the plant at .Millers, l,ut, as that plant is one of the latest oi the Huttcrs installalions. it iircsumaMv repnsents the hcst lUitters practice, and it would seem fair to examine Mr. Lainli's ^talemeiits and eonelusioiis m the liL,dit of tacts pi'rtainini; to that plant. Mr. K Chester Turner, superintendeiu t'o.r the Tonop.ali company, and Mr. .\. R. l'ars.,ns, mill suju'rintcndent. have kindly furnislud me information al.out llu' Millers plant, which is ,t,u\-en helow in parallel column with .Mr Laml/s staK'tiients: I--i"ili. 'rnnur \ l',crs. .iis. Cap.uuv .,f tiltcnn- vats \,,t ..^ivm :) \MI ru ti .^i/.c ..( tilu-rs_ -, 1,,. ,1) ,, J , ,, ,, ,„ ,,^ ,, ,-. ,, ,, Auinlior .if hlttTS _>ii; |i,._, Tunc ro.|uir<.-(l til transfer juilti . in niimiles -.'ri niinules I imo rciiuired til till vats Willi uater 10 Ml I)isehar>,'in^; cake ,„ >■ xT,' mven Kunnini; lack water \,„ ^.veii ■n Running; in pulp HI nnniHcs -O - .Ma.Ninniin hei^;ht of lift (lurin.j trans. for of pulii an.l water, liv'eentnf- ".'^■•'1 I'lnnps • Ill ^.^,1 _,- ,-,._,f It would have seemed in order for Mr. Lamh to have made sure of his own .-^mund ln'fore attackin.i; tlu> statements I made. *MlNlNr. AND SciEMlnc I'rk^.;, J.inu.lrv l.C H1(I7. pai;.- .'.4. r..:::;::.'r, .^n., St.i(.,.s , ,,.,, i-Kh>>. ui-ecnihiT l-i. liidti. i>.iv:f 714. Jdnt-n in I'tTsunal lottfr lo me. AV-,( l-.X I ( V.l Mill: /'AM( //( /•: III ;i iMf-uial Irtirr he .uliiiits tile hi i rtio. ( ,| mv a-.snm;.tiMn, that, with the same sliiiic, the l.>a,hiiL; an 1 washili- ],rri.uU ai^l the vacinim rcrniirr.l. i1r., an !..• Ii.^uiv,] ,ii,. same Imi- 1„,iii pn,. ces«s. !., I it !,(■ a->iinir.i thin lliat LiIhUx- Hdl slinir is tn be ''•""""' '"> ■' I'l'"" I'tii't "I the same units as at Millers. '[\tc Itvatni. lit rycli' \vi.n!,| !„■ as Inllnws; '-"•"hn« Running , Tot.il Tntal tiiiK' 111 lyilo . . . . Tutal nutnhtT of ivik's fill inmutt's _'i I .'() i:il I .•. _'(l Jll -' 1 ."i miiiiitis '■'< lir, :!.") niin. '>.7 per J I hr. .Mr I.atiil, stall's that J.IO leaves nr lihefs like the ,,nes in- stalled at Millei-s •■winiM (asilv hanijie {he mill mitput il.il.ertv Relh of ■;.-,(! tnns per ilay." As statel in mv previ-nis artiele 4:) ehan^..-^ iif the .MiH„-e liaskets .are n,,\v iiee.-.sar\- to handle that t-,-s unit, under e. .nsideratii.n, would ,>i.ri--rnt .")'.•,.-,(;:; m| ft, ..f eake |i,,-med, as the VC, titters Iiaw an a.'ea . .f •S-VMt sip ft. T.. handle, thni. the l^ilu/tv Hell timnaLte \v,,uld require 1 7', I ■. als ,,f the size at .Mille,-s. .„• ICl) Iraves mstead nf the l'.")l) thai .M .• L.imli Mi\,.s as a suriieieiit munl.e.-, ..,■ the ;^:il) Moore leases now duin- the wiirk. .\L'ain .Mr. I.atnl. prope'rlv >nr '.)-iii. puiiii) \vi,iil.l |.,-. ihahlv haiiillc tho pulp in 10 nimim-. l-..,- .a h.ix , (.mainiii- _>.")l) Hiittr.vs l.a\as, thr rapaiilx- WouM he ll.SdDi'ii, It., il" il wn-f ..f t lir s.am,. .lesion as till' lii'Xfs at .Millr,-s. in-iiail nf i!ic 7.(1111) (n. ft. 'ji\rn l.v .Mr. Lamb. Till' ani'iuiit 'if pulp an,\\\- 230 A7-:( /-.A'/ ( WW/ni; /'AM( //( /,. t.rs a„,l M,„.,v syst,.,n. Mr H,K,|„rs -riti ,.„, i. ..ntinlv jus, '""M nn, .4,v.. tluM. .lata, as I I,av,. n-., ^„ „ ,1,..,,,^ Slid, "as 1 l'^'^'-"n th. M„„n. pnH.ss. an. vi„a,oi I,v,uo fa,,..rs. uam.lv •^' '7''';' ""• !-'•"" '^■■'- n,n s.Avral -a ..■]<-, w,i l.nut iv-nn,!,,,. ••'"'' '!"■ lu-avy san.l rapi.lly . „. tlir hltrr. to pnvrs, a.M raisol thr costs matcmlly for thr ]n-nn.\ >.„vrn.,l l,v ,1„. ,la,a 1 hnvr \, tlu. LilHTty Holl. t!u. t,l„.,-. a,v l„.,n^ dtan.,..,! as ,-ap,.llv a. mav 1,. to a luilrr type, in part sim.lar to thr o„,.s at H,,/],, .,„a' ,,, pairs tnakr r^'atv. though, that fit.rivpairs arr Ks. f,,r ,1,,. [5„,,.rs than tor the .M(i,,r,- prorcs-, U'llurnif. January :!(). (•^■.\.\Il).\TI()^• AT copALA. .\n:xic() tory. It was pivnarr,! (,„■ ,h,. purp,,.,- ..| o.iiipannv .|'ii'l^l>- ■"1 n n r ^UCiliLES Osit3iT>e/tifyganare*me.-oll}t,'''Cr-tf C^6 ^/^ ca-npc/fsfons m ^eit'c^r currency/ ^t Tola/ coj f //^ ^/a carrnfic^ o^ prvc^cai-aa ^ '^""f.mfmryanajnmii^-tOonBxro.: Copala. OecFi 06 Fi),'. L'S. costs at the wn-jnus staL'-<\s ati:! .-il-i.-i t.--. ,T-.--;r-.i, :....!!.. .< :■.,,. .;. . present sxsteni and cnipaiv it with ..tluTs which have preccied Kl-A l:.\ I ( r.l \ll>l: l':< \i I l( /•; it. \'n\ will iioticr that the aii^l inatnicin i, (ntinl\ 'li-.|ii'iiscil with, all zitu- shorts hciiii,' ri'tunu'l In th. hra.l m. ij(,n^ i.f the Ikixi-s, not only art'oidin,'; u^ a inarknl >a\iim in /in. rMnsiiiii',;. Int also Kri'atly simplifyin.i,' tlu' ]inKr>s and >a\in- n> the ..ki (,| ,u id. extra filtiT-pri'ss. a(iil-]iuin]i. I'tc. 1'"' I'l-i I ii'it.iii'in lioxrs arc of ( i.^rl,t i nnipariinmls with liottoni-disihar>,'c valves. The slime is run int.. a s, rriiiin..,' tank throiitjh a Xo. MOseri'cn. The tank is tna.lr in tw.. . . .nipartnunts, scparal..! l.y a \arti. al .livisi.in ha\ in- its ti'ii -.ix in. lu s l.tluw the u]>]ier rim of the tank, so that wlu'n the first .li\isi.,ii is full the product ovcrllows into the scc-ond (leavin'^', ..f curs.', nearly all the] >r.. ipitatcs ni the tirst s. ,'ti..ni an.l is th.n punipid thr. iu'.,'h the filter-])ress. M..th .li\isi,,ns havt' l.ottoni . ..nn.. i i. .iis i.. ilir lilter. This arran-.iiunt allows the i leaniii'.' ..f all tli.' I...x<'s without int. rruption. f>,r, as we very fr. .|uint I\- '.^.t ni..i\' than a lak.' .it pRripitat.' in tlir.'f ..f tlu' f.mr l...\.'s an.l as w.' have t.i ilian all <x. wli.'r.' the tlux ami l.in.ler ar.' t li..rou,L;hly ine..ri)oral.s! .-md pr.sse.l int.. l.ri.piet l.'s, whieh ar.' then rea.l\- for the .-m.-iLle. ()nl\- the \.e :;ill) eru.i!ik> is use.l. an.l a unit eharuie e.insists .,f 2_>() II. . pre.ipilate with its tlux. As the liri(]uettes melt .hiwu m..r.' .ar.' .a.M.'.l, i.uitil th..' erueil.le has iis l\ill ehar^c. 'I'lirrc i.. ii.> diistiii'^'. l"..ur thousand thr.'e hun.ire.l ..uiiees are ri'tine.l as a ehar-e an.l f..ur .■har'^'.s are run in the saiiU' . a , I.an' li-''r":n,' tn a .:„all pun,,, „car tl„. i,l,,.,-. Ti„. ..„,„v ,l,,.,r .^.l..>nu,^hIvuaslu.,IuH, ah,,.. ,...,..„,,„„„ „„| ,„■ ,, .„n,,l,. 'nv-,,as. ,,„ ,1,., .,„,„,,„ ,]„. ,vat,.r,. ,„„„,,., 1 ,:„■, „„1, ", h,. ,,,,., ""; '■'"'''"'■-^ '-^ ■■' '"■"!- ""!■ -IH..' i.laM.,- walU ..x,,-,,,!,,,. „, ";""" ";"'■ ■"' '-^ '" ""■ "'"■■•■ -iH-- tiuTc is a .,.,„,.,„ >,;i,,, llHs ,„ak.. „ .a-y „, ,1,,,.,., any . a.vl.ssm-ss in han^llnw ,!„• Iir,„lu. t. ,, ''''"■ ■''^"' """-*^' "f "">■ ^vl'"" f">vn,an an.l Uvr nat.v. l,„v. '■';■■ '"■ l"-"l"'-"""-'--iv 1^:^':, .,, ,l,a, takm;: .v.tv. Inn., .nm .■,,»- :;;':,';""•" ' ' ^"■^; i— >.v,s,.x„vn„.iv i„w. \v/ha„,ii,. ,.,. an av.,a,,n. al„,ut ,h,v.. „,„.„,■,„,, ,,„t,,„. ,„.,. „,^ ,„,,, _Althuu,l, ,1,,. „,.,i„„, „ ,■,,,,■,,„„ ,„.^^. , ,1^^^^^ ,1,,,,, a,-. ,u-,. "••'"■■•■,■ ,.a,u,vs ,.,„ ,1,., aa. ..na,nlv n,„ ,n ^,.„..:-al us., „a,n,.lv 1 Rm.nnn,. all /inr .1,,,,-t-, „, l„,x,.. an,l thus ,.n,„-..lv ,1,.- piMism,,' \vith aii,! t i-.^attmnt ^ 1^. Hr.|u.t„n^ ,„-„,iu.t u„h ,]ux ,n. u;-,.,„-a,,,l and snidt- .n^sanu.u„h,.u, .v ,1,-vin^ ah,,- av,.,-a;;.. .V , m,„s,u,v,. charge '" '"'""f """"''"""'" '•"^'■■^'' "--■'•'- '"^'^in, unit thai-e. (,t t<,u,-aii,i ttw 1 .1):):)^,,;., l.anq. H, ,'!''';V"'-' ''" '"■'■"•"-"'■'-^^^'"1 .T.-.-ati-,n r„r ..n n,.,n,hs. t, "'" ^'- l"--'l"ta...nd,.,x.s. ,h.n h.h.lv kuin, the ' "■'"' "." "'I' '" '•' ''^l'>'' '"■ 1.^ >"■ and ah..,-na„n,' th,s until -«-...n ,s half Hn.d, an,i ,.,.dlv t,,H,,, .ntnvlv ...Ut ca,..;^;;- Pla.v.l I,,„,^. „nc, .vc. hav. attaui.,! th. ,i,.s„v,l n.sult Vll the y-uu- IS cnsunuMl an.l prcripitatiun is jHrtVrt ' •"■ I'n.iu.ttin.,. pat-tlv ,lnes avvay u„h th. expense ,.f calcin- "^- ^" ''"'"•"■'-^'-'-'1 '"">--', "wnstun.. Th,.pn,duc"". ■" --■>• nay sa.n- ann deane,- ,., handle and there is „ , spi.ti,:^ jn- dustn.. ., the p,.,„,uet in the et-uetl-les. The eapaeu v o; ih^ lattu is hkewise ureatlv niereas,.,! „,i1„c. .i -■ . m sate praetiee otad.jin- the ,lry ealeined ik,u-,1. > ^- 1 \ UI I- r t') saint' is f.Wlowt'd. 234 /c of 'rKiii.-itiN \\( Mr. Edwin Hurt, nin^; & Railwav Co , I, ^nii,'rr until it is as t' to ilic ( ru- iili as (Ifsirci Ml as It was he who first uwn tirii|uittini,'-ina( hmc ■nntfndcnt of cvani. ink' tor i;i Or Id . will l,.'ar iiir oiii 111 all of the ah. put It into praituc in Mexi mintinnf(l company also now j •i vrry ini,'cniovis dc\ it in\ciitin>,' his . t hi' above- >r No. ,-{, tl fu, ns means It- rnni.-tics all ot it-, product. uork an arf,'f sa\ inj,' in I shall tinish t 'TV. tl fa.t. • ■ronoiiiual y sayim; that the iiracluc lurr i '■'luipmrnl is ,,,mpl,H'. and tin- ivsults a It is h,,prd tl you st'f in this sh,,rt sk and I shall W ^W\ to re hat you will maki •till that 111, s \(Ty satis- ri' ( (Ttai.ily use of whatc\-fr i\' pro\c ot \alur to (jth "op.'ila. Sinaloa. M :iU any cli-,, ussion on the suhjert. I-Alhll MK X. H. Hllu iM'o. |anuar\- 12. Til Mr ■i:ks i-ii/ri:R The Kditor: Sir: — The discussi filtor-firoccssc'S has her (March 21, IflOTi oil ill rr-;ir.l to thu M (Jure al st interestin;,' to me data may he of use t 111 tlif treatment of si itiu\ hr I, ti"n null ;it OnMiirM. Xr\a.l o tile i.rnt\-ssi<,n: thrv n'f.r |., the t\,inl Hut tors .p.t,ahU- lina- storajjt I'lii- tanks and a].]! vat- tranics. dui :iiim tUi 'r,.!u> in use are as follows; Two slime d I, wash vairr vats, the filler h..x an.l 'X I'T th I' \\a^ ]'. '>nv four in( h Huitrrs m. li Knv.,di eentriluual pnuip. 'I'll'' pulp afln- agitation. "I fi'anu- itrifiiijal sji eanvns one \aruuu)- )Uni >uv two n o| , \atiidc. is dis,! ti> ft. diaui l.v |_> tllc tlhtTd)(.X a nieelianiial st of tlu \alv(S. an I ' 'ntaiiiiui ilpUl'. till' ft. 'I a loll,, solu inic-stora-i.' vats i lli.G.' In.^'h with sji.^rhtiy coniral hottonis, ivadv for laf^'i int(j ihr >f thi' -r \al' ai'i' m U-- larli our in-in- a].parati will rasily hold ihiTi- v] is s|,r, itii'd further on i ronsisttui c throu^'hout. () itii iiaddlcs. krcpiiu^ the pul t'ontaiuint,' lie \at ot thi- larj^'es for the hlterd eapac ity MIX (th e size of whieh lliout ei''ht eh and the tuo u-^ed i n eonjiuution will IkjI.I all depeudiiu; ou the thiek ake to he foruieil. rile stora,t;e-\-ats. hlter-hox. :ness ot the pulp ill ^vasll-water \at> on the and vaeiiuni witli the tilter 1. 'X is jilaced aliout le pump used ill eonneet ion simplities the pi;.in,<; and oiierat sl.K teet lielow the X'a ts, w hiel ineii eeutrifuL'al tion ot ;"h adaiitt'd to the lias uinp (patented l.v .Mr. Hutt ersi 1- inj; of pulp eontainin' is four- spoeiallv least tro trouble to the operat ■linie or tiiu' sand. or or nieelia Tl uMesome jiuni]) in the mill. hv 10 ft. 2* 10 inside top measurement s of the filter- Jn., the sid( from the discharjre gate t ity of about TSo s oxtoml .") ft. (H nio; it is the >x are ft. 11 J o the top is just 1 1 ft. 7 J i in. above the eone. and cu. ft. when not eont in., with a eaiiac- ainine; the frames. The ins,' surface. There ar . eaen navin.ir about <)() sq. ft. of n\u of these frames; six sets of fou- -• r, and ••ta /,m„,vt..l l,y j-i„. ,ru„ ,„,,„i- f,-,„n ,1„. r.„uuTt„.„ ,,„ ,he tran.cs ll„-uu.^.l, ,1„. si.lr .,f 1,1,.,- l.,,x „, ,h,. „„.,„ ,,„,„■ , ,„ thr „ut- '"''" ''■"'"'■- '" ""■ varuun, pum,,. h i.iav !„■ ,nrnti.„u-.l h,Tc tliat the ru„„cvl,n- , ., ,i„. ,Van,rs i,, tlu' va,u.„„ pump .h,n,l,i !„■ '" ""■ »"1'- "1 ■"■'l^i- t" lir >n„vc-n,cni tc ,:,•, at wlirnrvtr ,i,vfssa,-v Al..,m :i.-, t..,,-, ..I sl,„„ a,v t. „t..l .lailv at this plant, invm- in- a |-,n. rakr v as „u,rh snlu- tioii as IS usr.l at piv.r„l. ,uvfss„atm,L; Irss ii,„,. ,,f a-itation a,i,l ,i;ivin- thr sanir ivsuh ,l wnuM ,v,iui,v stih less time in washiii" ''^'' ;'''^'' '■'"■ -'■"HM,vat,n^ rapantv is „,nv heni^ rnla,-rd I'lr tins purpose. A tvrnnl ua.s k,p, n, tlu. rhaiyrs. in r,va,-,l tu thr tn,... in tormina ,akc. punipin.^ ,,f p„lp ,„ , „■ ,,i„ ,„■ p,,^ ,hi. kiuss ,,t cake etc. Ihr tMll.nvm- i. taken I n m, these reeu,-,ls when the t.lant was tii-st installed: Filluif; .,f I„,x xMti, ,„,;,, ^'_- ill. xaeuuiii, Hhil,. r.,niiiii;j j.in. r,-,ke hnipiMii- 1„,.\ «,,|| ,v,„ va.uuin .m , ,ik,.v lumping; m Aeak— .IuImii h,,s|, Uashinj.; uith w.ak s.,lai,.,n, I.Vni. \ a. uun I'limpii'j,' h.uk urak -mIuIi..!] Killing' with wa-ili walcr Washiii.!,. Willi wasli-u.,i,r, .■Jan. ■.aemiin .Sainplinj; eakt' Dreppiiii,. eake wiih water. Kuiinint; haek surplus wal.r SluhiH),'. .Mniinuini tune. .\l.L\iiiuiin tiiiif .Miniii.v, Minules, III PI Id l."> l."> IS 17 lii .'id Id Id ."ill Id I I Id lotai Ids Five tnunths later when earlinnatenf hn,,. p.^anie notieeal.le ami with inerease,! anmnnt nf slime in the pulp, the h-ures were: '////• Hr iTi:i<> !-ii:i i-:k. 237 i-illins^ \'ac'iuiin . . ICini.t\ni;; Hilh .!-m. vaiuuiii on cake I'miiiniiy in i\:i~li Washing' Willi JJ-in. \:uiiiini Samiilinj,' cakr . . . . Dnippiny laki' Runnini; bark wati r ■.■ ■ Sluicing' Total Miniiuuin tin Mimii,--. IS 17 Hi 70 7 14 \ Maxiinuni lime. Minutes. 20 25 20 18 80 10 15 10 7 20,-) Vou w,l! „,,ii... ,|,a, ,„,, wasluK w. ,v asc.l uhn, tl,.. plant was .H-s, uKlall..,!, l,u, |a;.- ,,„lv ,,„,■, Th,. rrasun (or this .-hanKo was tin- uuivasr,! amnunt nf si,,,,,.; thr sa , ,n..' of t„m.- the . xpnsurr ,.t xh, oakrs ,],. s.vn„,l tin,, fnr s,, 1„„^ ,.,,.,, an-, ransin^ '"'''"'•"■'■^"■'^•"'^■^^■^'^'i-^^-^'t^-'- "ft.-n ,on.a„u.,l as much .■vanido as ili.l t,u' weak ^wish ami the see(,n,l prneess i^ave latter re- sults. At first. wlH.n the eanvas ^. as now. wlnlo punipini' the sur- plus in,;,, ,,„t ,,r wash-water inf. the l.n.x after the , akes had '"■,'■" ""-'"-I- '' ^■■•"■"un> of t,ve utehes was left on the frames th,s l,e,n.o ,„st enou^d, „, keep the rake,, from sli,.pm..' otT and H-t enuuoh to dry or eausc. eraekin.r, 1„„ [ ,-„„„,| ,,,\^^^. .a^honate "I lune l.eoan to torn, on th. eanvas ,and whe.v onlv the dipping <■! tlu. t,-an,es ,n hydnnhlono aeid was ivsoned to, that hve inehes was too ,nueh vaeuun, and eaused the eakes to drv and eraek, iiut three inehes p,-o\ed nio,-o satisfaetoi-y. After the ^^asl„nK of the eakes thev are dislod-ed fn,m the trantes he wator lo,xvd tVon, the ,ns de. The surplus w.ish-water IS ,-un l.aek to the sto,a,t,'e-val l,y .^M'avitv and onlv that water (1* tn ..^ tons, dep, ndmo on the amount of assoeiated washed shmei ren,am,no in the eone of the l,ox ,s l,,st, whn. h is neees- sary ,n shne.n-. the slinie awav th,-ouol, an ,S-in. cpnek-openmL' «ato-valve. ^ Verv htlle has been said l,eretof,„v ahout the earhonate ot hme to,-m,n,,' on and in the f,lte,-s. whieh ,n mv opinion .s quite a>l essential ohstaele to he oot nd of. Although s.miewhat simple It IS a neeessarv teatu:e ,n the su, eessful operation of the proeess and ,t eannot l,e aeeomphshed l,v s.mplv ,lipp,n^. th.. frames i„ a '2' . solntii>n of !!(■] ..;„,! ..v-., ^ ,,,-... • is used in the millinL', of tht aiii.Hiril o, jinu' re. say from 7 to 20 Ih per ton. It 238 RF.ChXT ( )-.\\/I>/-: I'R.UTICE. imist \,v ar.omj.lislird l.y washin- with the use .,f vacuum, or any cither moans tliat cither forces .,r draws the di.solvinj,' 2' ; solution of HCl acid throuj,'h each .ell of the cocoa-niattin,!,' for lo to 45 mm ;i ihis pro.'css is used, the frames will onlv have to he sub- jected to the wash once in three ,ir f(,ur months, dei)cnding "ti the amount of lime in use, whereas the dippin- operation ^vould ha\e to lu' done at least onfe in two (,r three weeks and then it would tie \(,'ry unsatisfactor\-. Although a small formation of lime on the filters does not seem either to interfere with the waslnni,' of the ijoM from the cake or to diminish the net extraction, it ,<;reatlv [.rol,m-s the oi)eration and rt'duces the capacity of the plant. One (ul.ic foot of dry Conihiii.ation slime wei-hs 70 11, or thereah.mt, while Kil) 11,. in water onlv occupi.s <,ne cubic foot. It was f,,und that (,ne s,,uare foot from a ^in. c.ke e.,ntained 5.0.'j 11,. drv slime and L>,S' , moisture, so ■ alculatin- from these results, in formin,i,'a ^in. cake y.,u -vould l,e treatin- (>.]] tons of .J hours, c(,untiiii,r all del.iys, with the use of a l.-)di.p. induction niot<,r operatin- two mechanical a.ijitators, one vacuum' pump, one J-in, centrifu-al slinie-pumi,. and three 2-in. centrif- ujjjal pumjis. One man jier shift (,f ei-lit hours can easilv operate the valves from a platf.,rm near the tilterd,ox, and have plentv (,f time for other mill-work. The Hutters-Cassel pnuess for Jilterini; slime is certainly a Rreat improvement over all other processes and as an invention it ranks with tlu' tube-mill in importance. 1'-. vS. Pkttis. nen\-er. i"ebruar\- 2S. TUBE-MILL LLXIXG (Mareh :iO, 19()7) The Editor: Sir— The experience of Mr. A. E. Drucker, in Korea, as given in your issue of Xovemher 17, lOOti. is interesting,'. To my mind, the reasons why he obtained sucli very unsatisfactory results in his ingenious experiment are the following: 1. His mill is probably too light in construction, thus allowing the lining to 'work.' Any continuous bonding move- ment in the walls of his mill must gradually break up his lining, which is in one continuous length. 2. I think it was a mistake to make tb.e lining in two distinct layers and to cover the tops of the rails. In reference to my 'honeycomb' linings which he refers to as 'proposed to be used,' I can assure him there is no doubt about the matter, they have actually been in use for over a vear, showing over three times the life of imported silex. Nine tube-mills are now running in Wailii with my patent linings. By dividing uj) the spaces, as I do, the lining material has not the same chance of working loose as in the nu'thod tried by Mr. Drucker. He is (piite right in saying that no cement will stand the terrific wear, but it only wears to a certain depth, when it becomes protected by the (|uartz jjrojeiting around it. If Mr. Drucker has a foundry handy I am sure he will find it worth while to try my system, as his only difficulty seems to be in holding the (juartz in position and not in the wearing ciualitv of the quartz lining. H. P. H.\RKV. Waihi Gold Mining Co.. Ltd.. Waihi. Xew Zealand, Feb- ruar\- 1. ASSAY OF CVAXIDK SOLUTIOXS Tiu' H.lif.r: Sir Will \(iu kiii'llv puMi^ii the f< illowiiit,' sclu'inc for the assay of cyanide s arc useful. Iv.litor ] TIIH I5UTTI-:RS filtkr (M.ii. h .11] l!l()7i 'l"lu' I'Mitcir: Sir- -As Mr, Xiitir sa\s, in vdur issiu' of I'rhniarv Hi, the data -i\cn in my fnrnui- rriiicisin wrvr n that ramp, the plant was not in opi ration, I am^lad toLrrt t hrdata sui)i)lie(l l,v Mr. Xnttrr, and knowim; the jioss-liilities ,,t the tiller, I teel sure that the results now l.ein.i; attained by Mr. Parsons will >honl\- \,v e\en hettiT, .M>- error in re,i,'ard to the nunil.er ot' tilter lea\-es at Millers was due to tl-.e tart that JKi lea\(s were hilled to the eompany. I pasume that it has lieen found thai less ka\es will treat their slinie. I shouM p.rhai.s ha\e said that, 'a plant, desit,r,ie.l aeeord- iiT^' to my iihas," instead of "a properlv f tile slime tre.-ite:! \'; -a:-. :••.■■•. f. -.-.'. i- experiments are Nein.s.,' made upon slime here in Cuanajuato of a J K k 244 A7-;(7-:.\y ( r.i.v//^-. /'A'U //(/•;. \vliirh a .akc 11 m. tliuk l.,riii> uuh a _'_' in \ a, uuiii m HI) inin. This slmu' n.voMlatrs a ^parin- <,| livr .,r ,„..,•<• iiulus (inst.a.l nf f<>uri. Til, • tilt,,- 1m,x tur this slinu'uill !„■.-, ft. II) „, fniin t h,' tup ol thf hh.r-lrav.N tu llir hupprr. an.l the latter will l,r (i It. :; in '«-I'. I n prat that Inr .'.-.I) l.avrs tnr shnir nplinanlv pn„lu,,.l ,n inillin-, a Mntur-, tilpr l.ox shnuhl not ,'x,r,.l 7.1)1)1) ruhir tr,.t. As iv^-anls thr tiinr an. I si/r ,,t pninp n, , .sai v for tfaiis- fciTin- pulp an,] water, an.l takni- Mr. Xutt.rs Ii-uit of |,!)|)|) (11. ft as thr ,ll^pla(,■nu■nt of thr ioa.h.l l,a\cs, :.. |l)l) ,i, ft, ,,f pulp u,,uM havr to 1„. tranM.rn.l A iD.n. pun.p ,| ha\r no • lata on haifl on the rapanly (if a '.) ni pumpi uo„l,| annally Tv,]xmr -a.-.-onlin- to thr inanuta, tunr' 7.:. nun and l,", lip. to lio this. As iT-ar.ls liltcr iTj.air-.. it i- har.lh- puttnii,' it Mfon^K- cnou-h (in virw of thr ta. t that liuttn-s tilt,r-l,.av,s Ikin,. 1h.„ ui op,. ration ov,Tt«ov,afs without ally si-US ot , l.i eTiorat i( ,n i t o ni.ivl V sa V t luit fillrr r,pair> aiv ■k^ss- for th,' Huturs than tor the .M,,or,' pro,rss. One of th,. -ivat p,.ints of sup,'rioritv of tlu' liuttirs nu'tho,lis that thr l,.a\,s han.- iK^rtrrtly still, an.l aiv sul.i-> t t,. no strains, an'nots,fap,,l las ar,' tlu' ■■!Hit,'r t vp,' at Mo,li,.". or cvc^n tou.h,'.] for months at a tinnv As a i.oini of int,-r,-,|, I max- stat,' that tlu' tilt,.r now l.cin- c-,)nstru,l,'.l lor th.. I'm-uiro mill of this phu-,'. is ,|,.si-n,.l on "t,'ra\itv" liu,-s, as illust ral,-.l in vour i-Miv of rcvnt .lat,-, an.l n.,t "all l)nnipui-:" an.l m thiscas,. i wlu^iv t lu' tiit,-r is till, .1 an.l ,.ni|,ti,',l liy Kni\-ilv. an.l thr pulp n'turucl fr..m a l..w sump-tank, their maximum lift will not ix.ic.l :ii) fct. I must not !„■ susp,vt,-.l ,,f h.-in- .•on\in<-,-.l of th,' m,-rits of th,' Hull, rs lilt, r , .n a,,ount of \,c\u'^ inU'ivste.l m its su,,vss - rath,T th.. ...ntrary. liavm.u lK,,,nu' inU'r.'st.'.l after o.nvietion as to its ni.iits. Mark R Lamh. ("■uanajualo, .M, .\ieo. Mar, h ti. IHaMUL: l.ivn fas-.iiv.l Lv Mr. [,ainl. with a ,'.,pv ,,f th,' for,'- U<.in,L;,.,ntnhnii,,n. Mr. i:. 1! XutU'r u rit,s t., sav that ■■! h,. tilters at l?...li,' ha\,' n,,t lain, an.l ar,' n.,t, s,rap,-.l in onl.-r to ,k'an off th,. ,ak,' Th,. .lis,.har-,. is a,-,',.mplisli,.,l rntireh" l,v l.L.win-^r tlle lak.' ..If with ,...mpress,.,i air. as stat,'.l l.v Mr. R. Cilmai"^ Hn.'wn in an ,.arli,.r arti,'!,'." I'Mitor.] PAXS V. TL-HK MILLS lAi.ni i;. Mm;, The KWitcir: Sir With rcfcrciH ( tn the discussions that have appcan'd in thf .MiMN(, AM> SciKNTiric I'kkss reuanlin.i,' tlic rciativf merits <>t j.ans and tul>c mills as sHmiiiL,' tiiaihincs, it mav hi' of inttTcst to [uil.Hsh the R-snhs o!" soiin' tests earned out at the Dolores mill, in Chihuahua, .Me.\ieo, In test Xo, I, the ore was crushed with cvanide solution l.y 1.') stamps, wei-hint; '.(1)1) 11,., throui,di a L'-mesii screen, the pu\], passin.t,' to the two Mryan mills with (lO-mesh scri'eiis, then to four pans in scries, thence thniu<,di two settlers, and tinallv throu,i,'h two eone-classitiers, '!"he o\crtlow from the classituTS went to the a,L;itation i.lant, and the underflow was returned to the tuhe- mill for re-rindin-, the re--round product joinini,' the stream from the settlers at the head of the loncs. In test No. 2, the pulp from the Hryaiis jiassed directly to the tuhe-mill, thence to the lones, the <.verllow ,is hefore to the agitation plant, the underflow hcin;,,' ix'turned p. the head of the l>an series, thence throu.i^h settlers to lones as l.eforc. In l,(.th tests samples were taken e\ery hour, ovit periods of twelve hours, from the heads (,f the tuhe-mill and heads of [,ans, and also frf.m the dischar-e ,,f satne. The hulk I'J hour samples was determine. 1 from the prop(,rtion of sand and slime in each sample, the dilTerence in slinn' content hetween hcadinj,,' and tailinj; bein,<; taken as the slimin.t; jxiwer of eaih machine. The followin,-: are the results ohtaimd. from the avera,t,'e of li\-e samples: Ti;sT .\(), 1. Pen ciila.ue ot sliiiu'. Tuhi-niill liciulmi; ,s .'|| p-m luMdm lailiti.^ 12 (i) I ircetitatjc 111' slimc I I ll_' tailing ,').'. .Vl Slinieil liy tul,e luiil :( I 1 1 H\ p.ms 1 1 .-, J TICST .\(), 2. Perecnta^;e of sliinc. Tul)c-nii!l luailint; | (;(; '.liliiiL; 1) (is I'an luailitli,' t.iiliiiL; , . SHiiud liy lulK-iiiill :!!» t2 liy pans Pen i-iua.ije lit slime, . . . . 7 -M) . . . . .",1 ,SN 44 . r>2 -^'' A7-.(/-.V/ ( r.l.V//-'/-. /'A'.K //(/■:. T;ikiiiK' an avcravjo ..f l„;th tfsts, to l.rinK' the marhincs under the same ronditidns, ^ivvs the lollowmi,' n-sult : IVri'cnt,ij;c shnicl l.v tu!.i--niill .„. .^^ ' ''■'"■' '■'.'.'.'..'..:. ■ \.l 02 '" f^'^'"-"tl'^'"- r,m Tlir pans us..,l arc .,f tlu' Wlirclcr tyi.c. with plain Hat nuiller and ,iirs; tliev have a dianicttr of live ivvt. Thr spool is (m ri'V. per iilinutr. ■!■'„. power rr<,uirol to drive the four pans is .-,(» h.p. The tuhe-nii is a machine si)ecially constructed l.y Allis- Chalniers, nia.ie in sections for nuiU> transport, and I'l.elieve is one of the (irst. if not the first. s,rtional tuhe-niill made It has a length inside of JOi ft. I,v ;) ft. (1 i„. ,iiam.. and runs at a speed of :?-, revolutions It is lined with white iron. an Ic on tins subject, althouj,'!) in the lypiral oxidizd |,'<)1.1 civ <,( the doscrt rc^'ions of Xcvada and California the ),'(,lil is free, it is so cxtrcnu'ly fine and (laky that it dues not nailily uinal),'aniato. hut only yields a comparatively small percenta^'c, and treatment \,y cyanide is necessary. The present fashion of puttinj.; in staniii-milis and amalK'aniatins,' arran^,'rments followed l,y a cyanide annex evi- dently is due solely to the "compelling,' [rower of custom," and not to anv proof that this is the best method of trcatin.i,' such ores. To me this looks like attt ii.ptinf,' to make the ore suit the iiro- ccss, instead of suitint; the process to the ore. The wet crushin.c; followed by lyanidation does not allow the treatment by either anialL;amation or cvanide to be done under the best conditions. It often happens, especially when inside anial^'amatin.i,' plates are used, that jjarticles of amal- gam become detached anr a sutlicient time to oxidize all the meruiry to mercuric oxide -this and the gold being readil\- soluble. Further, the sand and slime are received in the c\-anide (!■ i)art- nient in the worst possible condition for treatment, as they con- tain a large excess of moisture which has to be displaceil by cyanide solution. This occasions a mechanical loss of cvanide and the dissolution of the gold is much slower than if the material had been dry when brought in contact with the cyanide solution. Many of these ores also contain large amounts of hvdratcd silicate minerals, such as clay and talc, which have the property of becoming plastic when worke-. Tlu-se oxidized surfaee oits are called •■free milling.'." i-videiitly ju-t l,c, .■uisc they sliow fre.- ,i,'old on pannin-. This is not eorreet. A "free millin- on '.one that yields a lanre ].roportion of its p.Id to plait! stamp-mill amal^a- matioii. In no instance will tl;- -e ■fre. ' dcs,rt ores \-ield any larije proportion of th.iryold t.i amalt;amation hut in the niajority of cases the ^'old is eompleiel\ soluKle in e\anide. HiCKTkAM Hint. San I'ratieisco, Ajiril 17. llWKi. SLIMl' I-II.TI-RS \I , 1 I'.n7 Tlic IMiinr: ^i: I li.ivc na'l with .i,'rfat interest the mntrihtitiMiis t" vmr iiiliiinns M'^ar.liiii,' re ( cut ile\ el'ipiuents in •clinic tillefiiiL; The n\ah-\- i.f the ailherent-. n\ the \\\n most pruinimiit •.•, -teIIl^ ..f \aeuuiii lilterinu shouM tcii.l to im|.rn\e the pr;eli. .-, I,nt I a\e watrhi'il in \aiii \<lifd is alhiut tln' sanu', Init whik' tlv' cake is formed in l.'J sec. in the Ridj;\vay machine, from :{() to tiO min. is recjuired in the American ])lant. From the nature of the ojicration it is evident that tlie rate o*' accumuhition of sHme heconies slower as the thick- ness ot tile cake- incH'ases, Tin- tirst one-ei,i,'hth inch is deposited in a much shorter perio.j than tlu' last eiijhth. It is improbable that the Anicricaii lilters accumulate from threc-sixte'cnths to three- riK'hths of an inch of c-.ke in the first K! sec., but the lon^ time requiieci for transfers makes a thick cake a nccessarv e\il. The \-cry rajjid accumulation of the Ridj,'\va\- filters must be due to elementary difference's that would not appear of such import- ame. Is it the dilfcrcno' in the filtering' medium or the position of the lilii'r' It siTins likely that filteT-eloth is so mucli loss e.i-ily cloL^j^'ci than c;in\as. that the main difference in results is accountei\c hive'rs (jf the eake-. the' effe'et of i)e)sitie)n. horizon- tally suspcnde'd e>r ve'rti'cd. the rates of aceumulation on canvas and tilter-eloth, .iiid the' durability of tilte'r-clolh in horizontal and \e'rtical iiositioiis, would be of -re'al assistanee' in improvinK e)ur jiraitice. I'ro.i,'re'ss is in t he ilire'ction of a eeimiiact auteimatic phnt that eaii be installed ami maintaine'd cheaplv. Th-' last •Aorei has not beeni spoken in the' iie'id i>f \-ae'uuni tilte'riiiL,'. J R. H1.AK1;. Searehli^'ht. Xevada. April S, ASSAY OF CVAXIDE SOLUTIONS iMay 4, \.'ram of cement copjier and boil unti' the solution takes on a blue or grecnish-b .;e color, j .)ur onto er-paper in funnel, wash twice with boilin;,' water; dry the rtlter-paper containin.i,' the jirecipi- tate in -y bath or otherwise; i\u\ filter-paper and precii)itate in assay-crucible, or, scorify, cupel, part, and weii,'h. Dorc.LAs MuiR. (juanajuato, Mexico. April S. SLIMI-: FILTKRIXG 'M.iy II 10117 Tiir Ivlitiir: Sir StfiiiLT the ncicssity tur a cMntinudiis filtn in tonncc- tiMii «itli t!h clinic tn-atnicr iiiunth, it R'ciuiivs seNrii men iMntiiuKiUsly ti> I lean tlic l».xcs, usiiii; ziiio shasiii'^'." 1 his statc!iU'iit is a]it t" iMjnwv a wrcmi,' impnssion, the piKiii,,!! luiiii,' that these mm not onl\- ilean the lj<..\es weokiy at three separate plants eyanidiiit,' a total of l'7,(l(l() tons per month, liut also ,!,, all work eonneete(l with the aeid treatment and smeltm- iweeklv. of the zini'uoM f,lime, amountmi,' to about tive tons .lr\- weii^rht per month, and produeinq; over 10!). (10(1 ounces of liullii in. Wailn. .\e\\ Zealand, Mareh lo. i:. ('. liwKs. mi:talllr(5ral dhvelopmkxt at (iUAXAJUATO HV T. A. RiCKAKI) .\la\ IS I««l7i It is wnrlli wliilr lu tril llu' sKii'y (It the iiutalkii-^'u-al ,i(\clnp. nu'Tit at the Sinna mill. :r.(irr properly iianicl La ILuicudd S^it I'raihis,,' ■/(• I'dslita. Tlic siurcssor to the oM /7,///i> was a mill .Tcitr.l ill ISdO; it tdntainr.l 21) stamps, each \vii,L;hin,>,' l.L'oO 11,. Tlu' ore lirst passed tlirouj,'h a !) 1,\- I.", in. Hlake crusher and was then reduced to •Jl)-mesh hy the stamps, from which it passed to six Hoss rapid-.ijrindin.; pans. Mere it was re-<,'round. so that all sa\e ,'> to 10' , i>asscd an M)-mesh sere, n; and then it descended to 12 more pans and six settlers. I"rom these the pulp went to li\e Wiilley tallies. The capacity of tile null was 1. .")()!) to I. SOU tons per month. The product was ainal.ijam and concentrate. The pans extracted ti.")' , of the asF:iy-value ,.nd the com-entrate contained 12', more. This was on the oxidize7.. silver, it l>arely paid to send It to market under the smelter conditions tlien existing in that part of Mexico. However, another factor came into play; as the lower working's were opened up. the percenta.tje of recovery by amals'.'^niation fell olT until it was only til)';. Concurrently, the consumption of mercury and eoi)per sulphate in the pans increased, while the coneemrate hecanie richer five to seven kilo, silver per ton. The method was changed; concentraticjn was made to precede pa amalj,'amatit)n. By this new arranj^ement . the cost of millin.i; w-as reduced from 7.S() /ic.sn.v to 4. Si. The loncentration was earrieil further, so that the jjroduct contained 10 to 11 kilo, sih'er and llo j,'rams jjold jier ton ; yet the wei.tjht of concentrate remained at two per cent of the crude ore, The hi^dier reeo\erv by c(.ncentration balanced the lower yield by amalijaniation. the eomme.-cial result being less satisfactory because the i)reeious metals in the form of amal- gam were worth more than when enclosed within a con- centrate that had to be transported to a distant smelter. Moreover, the variation in smelter rates introduced a factor of itn^v^rt 11TT t \- METALlARdlCAL DEVEH U'MEXT Extraction finally full Ix'low (iO' ; . This sujjj^cstiMi an intrease in the mill, so as to lowi-r the tixed thar^us. At this jjeriod the Government tax and the expenses in connection with realization of bullion amounted to 1 1 ' , of its j^'ross value. The jxtor extraction and the hij^h imi)osts left but a small niar),'in of profit. A search for better metallur^'ical treatment was undertaken. The cvani- dation tests made by Leonard Holms in 1!>()I did not seem to justify turnini,' to that methud at that time, subsecjuentlv, howe\-er, E. M. Hamilton made a new ri'searth on a working basis, with a tive-toii ])lant, and he obtai' • il cncourai^int,' results. IIowe\'er, notliini; was done for a year. Meanwhile the rcc'i\ery b\- amalijamation continued to dwindle and when cyanidation was ecommenccd, there was a fear lest the fvirther cn.nij^e in the or ^ with depth mi.uht alTect extraction by cvanide as it liad done that b\ mercury. In 1904, Bernard MaiDonald was eni,'at,'cil to investii;ate the problem, with the idea, amont; olhirs. that the Hendryx jirocess mi^dit be applied. Comiilete cyanide tests were maile and ever\- kind of ore in the mine was tried. The results fully confirmed Hamilton's earlier Work; c\cn on the ore from llu' bottom of the Siren.a mine it was demonstrated that liner >,'rindinj,' was required and that e\en the concentrate, if ^'round dry to pass throut,dl 200 mesli, would yield !lt to IMi' , with the use of a 12,")' , cvanide solution — a solution imusua'ly stront;, but based \i])on the rclatix'c jiropurtion of silxiT to 111' dissolved. A weaker solution woidd ha\e done better, as was proxed later. In these tests a fresh soluti'in was introduced each 24 hours into bottles that were agitated by beini; attached to the ]ieri])herv of a slowly re\-ol\-in,ij wheel. This failed to rejjroducc wurkini; conditions, beiause it clinunat^'d a diMwback ine\ itable in ])ractice — that is, foul solutions. l"or this reason the results were hiijhcr than was to be expei'ted in the mill, but they warranted the belief that a plant spe( ially ilcsitjiicd for t! c treatment I't the concentrate, would yield lar<.;er prolits than the sale (if the (uncentratc to the smellers. TIk- tests demonstrated also that the siher siil[ihide was readily attacked by lyanide when the i;rmf-: I-I<\CTH I-:. l-tor,. Wlun >un.,nlraliu„ was nia.lr tu ,„v,r,ir anial-ainati..n. \.hv -nn.liiiL; in pans was .liscnntinur.l. ,t luin- fnun.l that anial-a- niaticn was tnn.t rlUvtivc' in rhaix'cs insU,,.! <,f tl,r .,nt. minus I>rn,vss. In rnvtni- tlu^ ryanidr ann.'X, llir .mlv rhan-r iv,]iureii was t.. .livtrt til.' (Imu- iVuni \W Willkv tal.los m , ..nr cla^Mfi, rs Tlu> c.arsc san.i wmt tn a tui,r mill nf Allis-ChalnuTs ,n akr .") It '''am, anl .'_• ft. lun.u'. It was Imr.i with .IiiIKmI ir.,n. wh.rh, attri- a tlir.T wevks' nin ■ "Haps,.,', s., that tho iisr ,,•, ,hr tuhr sKippcMl ahniptlv. It has „,,, !„,,„ ,.„,,,!, ,,.^,i ,„„,,. -j-^.^,^ prnvr.l that ti.r iKiu'hi Ml thr iv-..nn,lm:. in ih,. tuh,' hanllv warrant,.! tlu- ,'Xtra ,xp,-ns,. n\ ivpairs an.] p,,w, r Th.. lir.t >■• .n,'-,.lassirK.rs went nut nf ,,„nmissinn. tin. pulp L;,,ni- fmni tlu' WiltK^vs tn a s,.t of oMU.-.la~Mlh-r> that s,.parat,' llu' san,l fmm thr shm,' Thr ar.-an<;rm.nt is sh,,wn h.ivwith, in Vr^ I. .1 ,s a lai-v spit/kaMrn s tt. wi,l,. an,i s It, ,l,,p. th,. ,lassih.,ati,,n h.^iiiL; hv -ravitv. The san,l, plus snnic .hm... tlnws thmu-h hiMmm- -,',ns,.-n,vks tn a h,i-Iu twn fc.'t al.nv,. th,. hnttnm int,. fnur smalK-r ,,„u.s ,,r spj,,;.'- Imtrn, * ft, wi.I,. an.i 4 ft. .K^p, ,.|u,pp,.,l u,th hv,lrauli,- .jets \hv un,l,-rMZr tmm all tlv,' .■nms unites tn ilnw tn ,.i._;ht Callnw ,.,|uentlv the na.-nm-y vats, f,,rmer!y .-mplnNa-.l „, ,1,-water- uvA tlu' pulp in-evi.ius tn pan amal-amatinn, were mn.lui,,! s,) as tn serve fnr hnl.lin- an,l thiekemn- the slim... Th,- ti\e enne- >lassitiers wer,. mr.v,..] mtn the stamp-mill, m nnler n,>t tn l,,s,. .Ura.i,.. and in this lu-w pnsiti,,n thev .leliveiv,] ,]iiv, t int.. the niasnnrv vats l„.hin,l th,' , ,M amal-amatinn pans. ,h,. vats huilt m tlu- , yani.ie annex Lein,- us,.l inr the sam,' i.urpnse. namely '".''•_^^'""'' ""' -'•'•i'-- l-:v''" nnw it ,nntains 7()' , water, an,l this ,()', is just sn much li(]ui.l that Ii.is tn 1,,^. ,!ispla,eil lev tlie cfTe.tiv,' ,vani,l,. s,iluti,m. un,il perteet ilitfusinn is attaim'.l. ' The ,,re ,i,',„s fn.in the Sirena mint tc the mill in ears iKil- Inirn \- la,'nl,s: ,,f .-,()-,». ft. ,a|.a,itv, earrvin,- L'. I t.ms eaJi. i 111 1 liU . a nnunie snu-dump, with ,i,'aliK' Imttnm, ami Mil' \I.IJ'I«,I(M. l)l-.VI-.I.(>l'}II:\r t(i work ta>ily. Waste is rcmox vd by scirtni'^ in the t,ii,r iMurt- yani at the riitran,,. ,,| tl,,. ,„ain aiiit. A surtint,' Ijfit is to he usfil at the new Sulclad shaft, the waste thru eliminated ie assoiiate. of the precious meials; it is more Jilentiful in the undi'^'<'Sted louiitry roik. In tiie ore of the Pere- k'riiia mme there is a little arsenii al jisrite and also traces of anti- monial si!\er minerals At (hianajuato LTenerally. the a\era-e yield of com-entrate does not t xceed two per ,'ent, carr\in.L; l.")l) to l.ti(li) o/, silver, and from 1 to :;(i oz. ^.'old per ton, so that xhv liroblem IS to treat a small ipiantitv of hi-h-.-rade material, in ('■mpt'tition with the e.xi.ensive frei-lit chari,'es s /n movis fastrr than the i)ail(lk's. On starting the agitation, one can sir the sinuous streaks of clear cyanide solution amid the slime, and tiiis condition of imperfect dispersion is never wholly overcome; it is due to the resistance of slime to diffusion. I notited this appearance (or ])henomenon) in a vat that had been at work for 4f) minutes. Another note; i-iy even ten minutes after th^ a},'itator is stopi)ed the movement of water at top of the vat continues in the direction started by the paddles. Two pounds of lime are added per ton of solution 'n order to hasten settlement of the slime. The philosophv of this has been discussed in connection with millmj,' at El Oro. The loss of sodium cyanide at the Sircna mill is 4.12 lb. per ton of crude ore, while the consumption of lime is at the rate of 6 lb., worth 12 pesos per metric ton. Sodium cyanide costs Sk Ty ?r*i .'•id h'lu I- XT ( )\\\ //>/■: /'AM, IK I.; Slo,,;, ,,.,• nu.lri. ,,,„ al Marl.l .,al„,n, ,]„■ ,,r.M-nt I.rm.nus "t the Mrxuan Crntral Raih-Ma.l aii.l tc il„s „u,st l.r a^l-lol 1 •'-> /'o.'x. nr. sav CO cr.Us |,,r irans,„,rt u, thr works, makii,.^ tl,. total inst M().{.) per incirK iciii n\ i.'.L'l)»-j)i.unils. TluTL' is alwavs s.,inc n'-pnvipitati.ni wlu'ii trratiiiK siivar sulphi.lr, l.y Ras,,n ,,f Wr tnrtnat.nn nf potassium sulpin,!.. hut tins ,s .Iniun,slu.,l l,v thr a.|,l„i,,„ „f IvaM acvtatr. whi. h funns a plumhous hvdratr that r.inovrs th,' soh.Mr sulphicK-s l,v tormina a h'a.l suIphi.U' an,i the potassium or s..,l,uni hv.lratc ' [n prar- tur, thr ri'-prr.ipuation .,f s.lvn" is surpasscl l,y the rr-.lissolvin^r of It in tlu' iyani(K' sohition. Hy I-assiuL; through c.nr-.lassitifrs th.^ ,,ro,ku t rscapin- from tbv upp.r mill ,s ,ln;,l„l in,o 'san,!' an,! -.hmo; uhuh are treat,.! separaf!v. or i„ tlie rvani,!.- annex, in t!ie 'san,!' .lepartment there were I'll vats, eaeli e,,ntainin,i,' an avera-e eliar-e of lTmI 7 'U It., or MMi t,.ns. Ihirin- tlie niontli I,7«»_' tons ulrvi ,,f san,l was tivate,]. Th,. avera-e assav^value l.efore treatment was -«- .. Km. silver an,l I,:i7 am. ,l;o1,]; after treatment tlie eontents were ..I' ,,-m. silver an,! »\ ,m,. ,L,n,l,l. In tlie Mime' .lepartment there were Si' vats, eael, eontainin,,' ;;.,S,-,|,s cu. ft. ,,f wet slime e,iu.valent to L'4.2(i t,.n-, ,jry. Durin- tlie m-.nth l,!ls:) tons were treated. Tlie average assay-value l.efore treatment was 27.") .-> -mi silver and 1.1} ithe employment of a nee.llesslv stron.ij soluti.m. Another faet,ir, tliat prevente,! sueeess with these si!..-,.r .--.r;.,. was tlie insuftieiint time -nen for eliemieal action. The element MI-.T \l.l.rR(.h \l. ni:VI:l.i>l'MI\ I .'(il oi time is csprc ially iiii|M )rtaiit in tlir i asc 'it c iinr•' V \. -; _.r/>;,,,/> . a^ TRKATMKXT OF MATTI- I-R()M THK c-VA.\Il)K MILL Hv A. l-:^ DklcM.K M.n IS I'.KiT '' '"■'>■ '"■ "' Ditrr.st I.. ,,,ii,,' to kn.-u ni a iiui( k ami (i.m- plitr wav ill ulii, !i to (xtrait tlu' mrtal-; tnmi a n, It matte as "'''•''"'■'' •" •' ' \aiii(lr ilraii up It cit.ii liappcus that thr \irM Irn'M this s..ui-rr a.hls ( . HIM. 1( niM \- t(i thr Illniith's ImlliMll ^"'r'l'"'' ''"■ niattr IcriiiiiiL; iKiiiriit. kiiius tnm; thr zinc suljihatr iZiiSO.i rriiiainm.,' with the prr. i|iitatc alt.r ai fl tr.at- iiU'iit. The aiii.itint of ZnSC, i.rrsciit will ,lr|irn.l. ,.t' c oiirs,>, iiV"n thr mniil,ir(,f uat. r \\a>hrs used m thr liiial aci^l trratiiirnt . Thr iiK.rr thr prcipiialr is washr.l, t!ir Irss will l,r thr matte l'';nnr,l ,,n a -,,1.1 hutton, | inlirvr that in ..ur ^'l '".-'tl... l>,vv,uuslv tu u-in,' n.v ,.,vs,.„. n„-,l„„l '" '■.■.lu,t„.n. w.. rrrta.nlv ,1„1 not uvKun,r ihr ,„vs,.,u.. ,,( anv '■';ns„l,ral,|,. anmnnt of inatir at a rlran-up, .,n,v tl„. „I,1 m.-thod "' tnatmr,, uiih n.tiv .„■ m ra,, in.n wa. .Imw an,' >"' ""M'l->r It IS n.,t >atr t,, all„u anv anv.unt uf tins ru h matte •;' a-vnnuHatr ,it assav. al,„ut >2n p.r II, . an,l f,,r that mtson ""■ '"-' Han ,s to tnat it nn,nr,],atrlv at tlir ni.l uf ,!„■ .lean-up "I'ltm.^ the l.ulHnn uuli the l^mM Imttuns nitn l,ars, l'"ta->nim .vani.le arts as a p...,vrrlnl >v.j,Hni- an-l desul- Plnin.n,, fh,x. an,l f,.,- tins naM.n u ^^as use,! lu,- ,lo„,npnsm^ tile matt, Our partutilar matt,' is nnusuallv In.^h-.^ra,!,. assav- inu' as mud, as s,.-,,.l)(. p.,- fn I. ,,,„tan,s xine, l.-a-l. and ,r,',n as sulpl,i,l.-s, l,rs„l,.s tlu. p,v,„,ns metals^ At tlu' m,. ntl.lv elean-up •■''""••, Mill !l, pr,v,puate ,s ,,l,,am,.l. pn.imn>- nearlv ;;,()()n „/ ■»II.,.n. .■,.! lr,,m tlu' treatm.nt ni tln> av ,,l,tain fnm, :!(l t,. 10 H'."Kitt,'. Ilu^am-nnit van.s tnm, ninnt li l,. m..nt h. TlK'nutl,,,,! of treatniini p,,- tlu^ matt,' is as h,ll,n\s ''"';^ "^^""■- '-ax. an,i .vani.l,. aiv put sepaat,.lv thnnt^h a small r,„k I,reak,T an,l .rushr.l tin,. H:,rax an,l evam.i.. atv »MM as ll„x,.s and a,v pt,i u„l, tl,,. matte int,, thve X,,. tlo .'ra,,lnte l"'ts,n,!„. p.ll..vn:,pn,p„n;„nsand,.vd..r: TIum e ar.. alternate ■^'l '" '""■■'^- "'^"''■' ^""1 >vamd,. llin.u.^h.nu, until the p,,t w lull, and imallv o,v,.,vd uul, l.nvax Tl„. .ru.il.les are n.,u- ;"" """ ""' '"'■»'"■>■ '""1 '' ^vhit,. I„.at maintame,! Inr tw., „r tluve "'"'-- As a rule, n takes a iittl,. ,,v,t tw,, l„,urs with a ^,H,d '':" ""■"•■'^'' '' •■''"'- -n ■•vlun th.. a,tiMn,s.-,,mpl,.t,. fnrthe '■"ar;,ewil,su!,s,dean,lth,.|,ul,l,lm.,.,asv. Th,. a, tr.n an.l l.urn- '"'f '" ""■ ^^''I''""- "''1 '»• ^'"I'nt at th,. end ,„ ,),, uvsi h.,ur •AIs,. th,. sla, will t„.,,,„i,. ,pnt,. thi,k wlu.n the a.ii.,n is ,-„mpl. !,■ l-'n^ n.m.,x,.d uith a skimm,.-; tins ,s n,,vs.arv l„-r,,re p„unn.^ ""■ '"'">"'^ "f th,. ,ru,,!,l, „,„, a e,,n„al m.Md If an ex,vss '" -vam.k. 1,.. „s,.d, 1, u,ll ;„. f.,un,l just al-,,v,. ,1,. u,,ld hntfrn '""' V" '"' '"""'"■" "'•' ''>■ ^' '''"^^^ "it'' ^' ''■■'">nun Th,. matte wih '!"^' '';;;""•• I>- ■l'v.nnp,,-,.d, kavin^ <.nlv a li^ht p,,r„us sla^ an,l tii,. L," lid Imtton This n-Kth.id sh,,v.s an ,.xtra,.ti<.n ,,f s.", p, up, ,,f tli,. p>fil value ,,( ,]„. ,,n,;inal matt,., ,l,.p,.n,lm..' up,,n th,. ru.hn..ss ,,f the niatiri.d tr,at,.d. ;;; S i,.? *' ? •- t~ ' CVAXJDI-: PKACrU-H AT COPALA June *%, iSHiT The K.litnr: Sir- -III r<-i;,ir.l \n saxini,' cyani^lr in the trratiiuiit ><( <;,,1,1 :uv\ silver nn. uh' liavr horn rnaMc.l l,v a MiiipK' nutho:l m ro.lu.o our cvaiii.lr r..nsuiniitinn from 4..-)t(. 1 T) II., [ur ton of .,rr trrair.l, an.l thr results arc so ititi'n'stin- that I licrrwith •cn.lrr them Inr puliliration. Wluii We lirst romiiH-nr-d treatment in Detoher. I'.KI,-,. our pniteetnc' alkalimty in the wcrkin.,' snlminns was earrie,! at il.()4';, nn tentis ,,f eaustie s^,^;^ ami the eyani.K eunsumpli. m varied troni 4 o to 1 .") 11], pel' t(in nf ore. The (,re is \ahialile for its silver, whieh oeeurs as a sulphide, ••"I'l 'arries fr. .m IL' u< I'll ,,z, of th.is metal per tr-n, to-eth,T "Uh a small .luantity of -,,1,], We (m,l that .->,_> 11,, ,,f linie p,T ton ,s suttiii.'ut to keep the alkalinitv at l),()4' , , Our extraetion lla,. inen euo,l. a verae„i>, <•:;', of l,oth ^oM and silver, and. aeeept- I'll,' the faet that a certain amount of eyanide will of neees,vt\ he omstanlly tied up ;is a doul.le eyanide ,.f zine and sodium (Usiui,^ so.iinm evanide,, uv li,-,\e not eon>idere.l tiie amount al.normak thou.uh the a.hisahilitv had heen dis, ussed .,.f installin- eleetro- Ivti. pnvipitation to ohviate this l.,ss of potential free cvanide. Ilouever, in readini; ,,ver 'The Cvam.lin.u of Cold and Silver Ores.' I'v juhan and Smart, 1 noted what was said (pa,t,'e «>!)i in re-ard to llu'deeompositionofthedouMeevanide ( .Xa.Znl'v, i l,v an increase inthe five alkali W, R, l-cMtman is there .piot.'d as saving: "Tlu' a.ldition of alkali to w,,rkin- evanide soluti..iis which have become s,,mewhat weak in alkali, l.rin.t^s up th.' streiiLjth hy rct,^>neralin-, that is. deconiposm.;. the zmc evanide, -. that as a tiiatterol lact, wlu'n the solutions are prett v stn.n^lv alkaline thev >'ontam no /me as cvamdc. hut ,,nlv the hvdrate dissolve,! in alkali With the olijcit of ascertaining what rcsiilts culd he o!,tained h.v incrcom- the alkalinitv. I commciu ed addm.; Imic. and kept '.■radu.illN increasing; the sanu- until the solutions tested O L" , alkahnily. ^ Our wo-kin- solution f,,r sliuie, which wv carrv'at 0,11'..', KC;c, ,ii ,,„ee heyan to i,'ain in stnn-th, anr! kej.t ,L;rowini( 'i 20() A7u l:.\T ( WWini: I'KM IICE. j^'raduallv stn.ni;iT iinlil it sliownl O,:!' , K("v; xUv alkalinity was tlii'ii .•ill.nvcl t.> fall t" y\A)\V , . v.iiri! lyaniiir strriiLjtli al>w t\ll. Alter iiianv ixiicnnuiiis with xarioiis strcnijths, [ louml (I i:i.')' ', to ln' tlu' least alkalinity with whii h I emiM reijeiierate, an. I k.ii- se(|ueiitl\- I have k<'i)t tlu' alkali at that streiv^rth e\ er since As a result .it tiiis rei,'eneral inn. nur i xaiude . nnsuniptMn has ncit (Xiceile.l 1 .") 11.. per tun treated tnr nil. re than h\e months; as a matter o| laet, no e\-aniile was added to tlu' slime-treatnient solutions tnr nearly i:i weeks, .md the amount useil to Krint: the- leaehin,L,'-|.Iant solutions uji to stri'tij^'th was small; this ot' eourse was .lue to the larije exe^'ss nt zine eyani.U' then I'xistin.i; in the system. In re.^'ard to the testin;^- for alkali, we first determine the free eyani.ie li\- tilratin.4 with stan.lard silver nilrat.' solution to the first faint ojia'.seiiu e. without the use of' the iiot.assiiim iodi.ie in. Heat. ir; we t .'n a.ld a tew dr..ps m.ire of' the siK.r nitrate to make the oj.alese.'nee well .lefnie.l. an.l titrate with X .") oxalic aeid s,,lution usjii'^ pheii.ili.ht halein as in.lieator. This is the metho.l re(.mimen.le.l li\- j. V. Clennell. an.l as it has been foun.l to eheek \erv closely with !,. .M . Creen's fcrnuvaniile metho.l. and also with that of Cerar.l Williams puMishe.l in the hutnuil .if the Chemical, Met allurL.'i.al & Mining; Societv of South .Vfrica. it has been a.lopted li\- preference on account of its simplii it\' l'inall\-. I \\..-iM say that up to .late there is no in.iicali.in u\ imnase in our cvani.le i .insumptinn. an.l as this w.irk has lieen K'oini,' on for the past five months [ ha\e i-oiiie to the conclusion that the rcLiciuratinn has assume.! ennstant proportion. 1.. M( .\ B Hii.i.ocK. C'ipala. Sinaloa. Mexico, Ma-,- 4 ASSAY OF CYAXIDK SOLUTFOXS Ijuno M, 11J(I7) Tlu' I-'ditor: Sir U" „^r notictM! tlic scln>nu's for the 'Assav of Cvanidc Solutions' in l\w I'kkss of Marcli IM. l,y Mr. Gen.iar. and of May 4, l-y -Mr. Muir. 1 uisii to call attention to the f.jllowinK well known method, wliieh I have found quick and accurate. To a convenient .juantity of KCX (workini; .solution) add an e.xces.s of weak copper sulj.hatc solution. Acidifv with dilute sulphuric acid. Filter the p-ecipitate. which is wiiite (or l.^rht- bluish ^jreeni and fioccul.'nt, and which contains all the ^..id and silver. Wash llie jirecipitate twi.e with i.ot water; drv filter- paper and contents hv placing then, in a crucible an.I heating in a muffle: (lux hit. r pa, er and preci,)itate, fuse, eut.el, part and \vei.t;h. To solutions weak m KCW a,ld a small piece of KCX salt m order to ^ive a .-ood precipitate of copper cyanide. Arcrsrrs M.\c-1)onai.i). /aeatecas. .Mexic(j, Mav 17. i.lime s. 111(17 ; Some tmc- ago Messrs. A. and 11, S. I.ennv announced ^ith a L'reat flare of trumpets, the triumph of their metalluruieal ."novation. Several of ,l,c mines under their technical control spent thousands of pounds to install the ,,rocvss of > ,,-culatm.' cvanide .solutions, advocated l,v the Dc^nnv brothers The UA- lowinu' para.^^aph from a siur.h dc'livc-n d at the annual mc-etin^ 'U the Nc'w (,ocl, min... bv Mr, CeorKe All.u, the chairman, ,s ra.her . .sconcvrtm.t; to tlu- 'new m..tallun.n- :' •■!„ addition to other drowlKuks, w,. have expenen.vd considerahlc. trouble with our new metallurgical -.ant. Whatever tluv-retical mcMts th.. svstem ;f '■""';"'^'""« ' ■ -lutionsm.v possess, the- fact ivmams "'f ""■""^■'- innvlcd upon to asc-cTtam the avcTa.i^e value o the ore ^.nw^ into the mill, namdv, ,1 scrcvn-assav 'is effcvtually destroved. Our managers and tchnical adviscTs have .^nd.'avorc.d to overc-omc- this diihcultv, l,ut appar.-ntlv without awy >;reat success, r.i ,1 consequ.mul;,;ati li li\- tlu' Mrssrs, L)enn\-, Till- FILTKATIOX OF SLIMI- liV THE BU MET HOI) Hv !•; .M Hamilton (Jum- J-J ami L'lt liM171 -\s tin. Butlers patt'Tit Hltcr has now ' 'HRS iciT HI o[n'ratioti tor n . r tin., v.ars. u „Kn- tan-!v 1,. on,snl.n.,i a practtcal SU.V.SS, ;,'••''"''• ''''■''^^'^-''-P--'''^'voa, Kta,K.,I.i..M.npt.,,n -> ."..i.t.on. .onstnut.on. and ntHho,! of work,,,,., ,„ th.. hop. '''■". '"^'^- I-nnv o, ...n.ral .nt.r.st t<, th. m,n,„, .o,nn,u„,tv "" "-:1 -t a .;l,c.rof sonu. so,-, wa. t.rst forohlv prrsmtMl'-o IK. nM.i. ot Uk„-;.s Hutt.rs a,td i,,s asso.,at.s a, th'.r w.,,.J : on.,„allv .!,.nv..,i front tin. Cot,,s,o.k ,,,,,,s, l,ut,t has :,..,,,, J::; ;'"' — t-aud s.v.rai „,n.s hv th. pan-an,a!,amat,on pn.-.ss ■--1 - U stan.ls todav ,n th. dants ,t ,o„ta,,,s ahout 7,- , r cvtu •;' — ■';■ 'i-;. - unl.a<.hal,l... and uhuh ntav. th.r.fo-v " '''::T7 ':^ ' •'"'' ""^ ^l>"- -'•'-. .xo.pt.onal .har- ; '"■ , " ■•'"'";"" '-"l--lnfiruh,.s..onn,.,...l u.th sol :.,„ of tlH- ,old and s,lv..r .ont.nts, whuh ,t ,s no- pn,„os.d to to,,,,, pnsi'd to tolKli MS,, ,1,1. ,n s.„l.„,„„, ,or,l..antat,on. Th. .lar,h.at,o„ pro- f"" ' " ^^"^'«;'''■'" ^-1' as 1,„H. ,s p.rt..,, 1,„, ,„. stthsid'n^-. ' , "■,"'" """""' "' "''"""" ■•-■"vc.-ahl. ,„ th,s wav ,s nut .not,, n, „..k.. tlu. d..a„tat,o„ pro..ss a pra.t,.al SU...SS. . ,Mon.ha,-,.,w,tha.ourtoo„. d.lu. ,n. w,lMn 2, hours not - t 1 to .,. than thr.. parts i,v w.„d,t ,,; solution to one of si,m. ".i .1- .lu.k.st pulp ohta,nahl.. hv , wo or thr.. davs' s.ttl.nu.nt ;,; "'•■ '■-!■ vats wll sttll .onta.n alun.t two of solutton to <„t. of shn-,. .V .u,-ious i)oint al main l'""t ,1 ,s that vvvn after hntiK' wash.,, ,n han..s o. ..an wat.r to r.„tov. all soluhl. salts. ,t w,ll sfll s.,,I. ,n a n,.,l,um o, d.st.H.d wat.r ntor. rap,dlv ,d .ont- I-^-tiv tnan ,n anv .oiut,on h,th.,-to t,-,.d, wheth.T a.,d or alkal,,,. ;'''''V;'"'-''''"-^'^*''--'^ ''''''-' •'''•->'"'p''H.n,ixtur.s..,,j;;; ^-a^ulat. ,n,o a .;.lati,u,us .urd. and th. shnv los.s t., a la^e. extent its p,,w,.r to s.parat. out !,y j.rravitv. tion.il 1,\- V Uispla\-.d m a niark.il man ann.r th. ph.nom.na ni.n- J"l'an and Smart ,n rvamdm. (lold and S.lv.r Or.s, 27u Kl-XliXT CYAMDI-: PRACTICE. namely, tliat toaj^'ulation is not nfccssarilv atcDiiipanifil 1]\ ijDod settlenient, ami that under certain eireunistanies e.\tessi\e c()a>,'u- lation is positively injurious. In one instance a sample ot slime, from which most of the tine silu'a had been remoxed liv careful separation, was dilutecl m the ])n)portion of four of water to o.ie of slime, and sutfieient lime added to neutralize the cliarj,'e and leave about 0.(1.") i)er cent of free alkali in solution; this pulp was then placed in a ),'raduated litre i\lin" \ieliis a j^'ood elaritication also, though the lafer jimcecds moP' slowlv than the subsidence of the A-ell-marked line of solids, and the solution h.as not the bril- liancy of that settled with lime. Thus, if the filter meth(Ml had not been adopted it is jirobable tli.it v.iustic sod.i or iiotash would have been more useful than lime as a proteiti\-e alkali. In re),'ard to the .settknicnt 111 distilled water, if it be true that some deijree of toat;ulalion is a necessary ])retursor to settlement ami clarification, then the slime bcini,' treated must either jtossess sonu' inherent power to coa^'ulate. or else, in spite of thorouj^'h washing', must dcwlop suifK-ifnt soluble mattTial b\- standin<4 in water to foriii an elecirohte .--ui'able for tb.is jjurpose. It ma\ be interestini; here to ^'i\e a few results, out of a num- ber of determinations, on the rate of si'ttlenient of this slime. J'liesc tt'sts Were made on ,an avera^'e sample such as is usuallv treated in the vats. Tlie aceomiiaiiyinj,' diagram will illustrate. (See I'ig. .'U.i The arrow-heails denote the defined surface lints of sub^idinL,' solids; the percentage figures on the right-h.ind side of each c\lindcr rejjresent the jiercentage of moisture still held hv the Settled slime at that point. The following notes will ex;,..iin: CVLIN'DHR XO. I. This sami)le of slime was washed in HI changes of clear ser\K c-w.iter, the operation extending o\er sev- eral days, and finishing with distilled water. When this last wash had been settled and decanted, distilled water w.as useil to bring up the dilution to 4 to 1. The line of subsidence was well defined l-ll.TKM h>\ ii/.- s/./.U/'.-. 071 >r..n tin. ,t.n,l,u, ,1k. i,,iun,-,v,anu.,la U.,n opal ,„„, whi.,. (IKI n.,t .li>ap|.car t hroiiu'linut the trst so as tu ,„su,v hav,„^ an approx.matdv c nns.an! Mn.n.th of f,vj aka, ,„ snlut,,,,, ,iun„.,. >lu. „„>. „f s..,,].,,,..,,,: ,„,lu. cas. „f t u' l,nu. ,h,s surn^.h was (..,);r, p.,- ,,,„, ,„^,,„,„ , ^,„,, „, ^,,^^^ "'""■ "'"^"'- '""^'^'- ""^ I-'- -"' . 1-th ,n ,..rms „Uaus,H- pn.ash CThHtftT I ^"^•fV-S^* -'OM m,^ - — — Jo - too Cy I .'ndCT II Cyi I nd«T rn C««stie pot a I h. -so mOO cc E~/ooo « -« i= ■JulphuTi e ac/d *~**'fV-^-:::s-l??i--»' 4tC>^ eel -lOOOi -« root-rf. cool — L-fto^ZJ| --ti'4oo^"t * " aool Cy I I Ti der V r~i -ao% cc /dOC —n -Kil?J Joo I TOO 4ic»^r^^^'' —^4 300 I zoo l-iij :ii ^5 f^ '*%^ h'l-A i:\r ( )■ \ \ //'/■: /'AM; //( /•: Siiiiilar !r>l>. m.i Ir uilli miisi.lcralih l.ivi'cr ,i!nuuiu> i<\ Irvc alkali m sdliiiinn, showed slii,'liil\ mtrnnv ifs\ilis ni ilir . a^c of ItilU'. I'UI a trn(lciu\ to ildscr >ctt liiiunt with raiistic ]iota^h in thi- lasc of iwhndi T Xo 2. the liim- Kft a --iiarklc and htiipiditv of the suiiffiiatam soUitioti laikiiij,' in that ^cltkMl with rati^tu pot- ash, though thr hittiT inij^'ht In- said to hr perffdU ilra|- unless eoiiipafcd with .\o. J. when a iliCfrrciuc would hciDitic apiiarcnt. C'N I.IMMvR .\() 4. In this test the same amount oi sliiiii; was taken as i,etoir, and the same ]iroportion o| water addi'd. Sultic tent ].ure sulphurir aeid was then iiii\e(l with it to lea\-e a little ffee and m exivss after dissohmu' ill it wuuld ot the soJuMe iiiatirial. In this medium the slinie settled heller than in the lime solution, hut the luiuid remained sli,i;lill\- opalescent. ('\'LI.\i)KR XO .", To this ii\e ..■ mis of alum were adil.M! a'ld allowed t(j dwsoh, -iMll^ a re-ult iiearh" as i;o<.d as thai ohtauied with eausiie p.iiash. and a solution of ahout t!ie same de-ree (it elearness. that is, ejeail. out laekm- the ahsohne puril\- ot the lime solution. The experiments here i,'i\i'n \mII lie suttii lent to induate the nature of the material to he treated, w hu h has a l^'arm- on the results ohlaine(l ],\ the Use of the filter. Alter experiment m,L; with se' eral forms of \aeuur.i-tilter units, tioth ivlmdrieal and reetan^'ular. the -\siini hereinafter descnhci was tiiiall;,- evoked, an.l \crv tew ( hani;es ha\e heeii niad< in il siiKc the tirst apphanee was installe.l on a workm,i,' seale in tl. \'irL;inia dw plant As at present eonsiru ted the tilterdeaf IS made on a frame, the ui)[)er side of whuli is formed on a har of wood. I; m, thiek and ."U in, wide, juared (,n edije. and Id ft, m k'n.-th. or sutrii unllv Ioiil; t(."), i The reinaimn,!,' three sides of the fi'ame are made o| i-m, ],ipc. one extremitx" of wluh is flattened, turneil at a riuht an-h. .md f,rml\ liolted to the under side of th.e wooden har. while the other extreinitv jirojeets tlirou.u'h the other end of till- same liar, in order toree<'i\e its c omieetion wit h thexauum- ehamher. lieinj.; 'ii;htl\ elani|(ed to the wood at the point where It jiasses tlirou,i,'h. Theujiper face of that pirtion of the pi]ie formin,^ the ho' in of the frame is pierced with '' i,,-in, holes at intervals of four nuh.es for its whole length, and through these the solution jiasses oft' from the (liter into tlu' H'ceiver. Ml , .!» 3=»; mm i P^ii*s*iifflii" tjipliiiiwii f^*/-* f ws^^m^i^^m^^^smi:^ !7I A7-.( l:.\l ( r.l.V//'/-. I'RMTICF. Till' (iltiTiii^^ iiumIhiiii lotisists, tirst , of a puce nf cuiiia mat, of sucli a sizi' as i^xaitly to till the space loniHMJ |,\ tin. frame (k-sc-rihcd a^oviv On cither side oi this is jilaeed a sheet of Ki-oz. canvas. lart,'e enouL;h to o\erlaii the frame. These three tluek- nessi'S of maienal are tiien sewed to;,'ether liy inaehme with i)ar- allel rows of stitdiini,' four inelies ajiart,- and periiendieular to llie sustainmi,' wooden har. \e\t, ijie fihenii:; medium so formed IS fitted in the frame, ihe o\ erlappm.i,' eanvas ed ,s hein;,,' >tilehed round the outMde of the lUpuiL;. and tiu' upper ed-e fastened to the Woollen har \<\ herni; sunk in the j,'roove shown m ihe draw- iti),' and a lath .Irneii in o\er ii , wedi^mi; it tirmlv m position. This lath IS also made to fullill anoi jn^r funet ion ; instead of l.iinj,' (jf such a thiekness as to he driven llush with t lie surface of the wooil, 11 IS made tcj pKiJecl outward for a distance of ahoui half an mch, and the under side of this jiroicclion is.j,roo\eaK-,'iii,U "Ht tu uiiu s..i(.' or the (itlu'r. Fur loc'alitii's wIh'Vc walcr is srarrc. and LiiMU'rallv when- it is (Ifsiralilc to send mit a > i>ni]iarati\ ily dr\' caki-, tlu' tVaiiir 'if thr k'at IS iiiiw incjditird tu adniil ><{ I liVdwin;,' utT the rake without prcvinusly snl)im-rj,'in<4 it m \>atrr as is done at \'ii''^'iina C'tv. Tilt' tranif uf \n\tv in tins case is madr t(j cxlcnd rmnid all tnur sidrs mstcail of onl_\- tlircc. tin- rxt iTir.itii'S jiass iliroii'^h the •,\o.,di'n liar al carli I'llil instrad of onl\' at one end of it, aiKJ thr pipe at the up]nT sidr of the fraiilr is piTforatcMi like thr lower onr. H\- this arrani^'ciiu-nt . water ean lie injeited iiilo the leaf alont,' the to]i tliroiii,'h one of the projeetitii,' e\tension> of the pijie, and sinniltaneousl\- eonipre-^eil air ean he ailniitti'd tlironL;h tile other pijie into the lower part of the frame. This has been found to make a jiert'eet diseliari;e of t hi' eake into the empt\' liox. wheiX'as water alone eoiild not lie made to L;i\i' a [iroper dis- C'har,<,'e unless the eakc^s were siilimerued. t'onijiressed air. alone, ean ln' used for a dre disehart^'e. hut it is not as salistai'torx' as the eomhination of water and air simul- taneouslw iSee 1ml;. 'M'i i At \"ii\!,'inia C'it\- the eontainin;; liox is an ek'etrohtie preeijii- tation liox whieli was not iiei'ded for its spet'ial purpose and was adapted to the list" of the new tilter. lieini; allowed to remain in Its oriijinal position. It was formerh- divided into \'l eompart- ments. eaeli ha\im; a hopiierdiottoni ; the partitions were remowd. and with them two of the sides of eaeli hopper, so that the wdiok' s|iaee was \aiatil troin end to end. and alter the liea\\' top rails had been removed the result was a hox '.\\ ft. s in. loii".,' and ii ft. II m. wide, the sides ln'ine \ertieal for a depth of ti\-e li et and then nii'etin,L; the X'-shapi'd liottom. In plaee of t he lo|i rails. 1 loards ."il in. wide and I mthiekweiv placed honzontall\- on the top cMli^es of the Imx. and on the outer tMh^e of these were tixeil eertieal hoards IJ in hi,L,'li and 1,' in. tlliek, all liemj; widl liohed toilet her and to the box, the result \vas to raise the siiles M» in. Iiii,dier than the\- were when used for ]ire- eipilation. The t\vo slu'hes till s formed aloni; t If sides of ihehox ser\e to I airv the ends o| I he lilleideai 1 lars and allow the Iea\es lo hani; frei- inside the box i I"i,l;. 'M ■ < )n one side of the slopini; b ittoni and. exleiidim,' down to its lowest point are four ilisehar.<,;e- doors. each I'Uine :iil .iiu'rture ot 1 L' m sini;ire the doors .ire m i i 27S A7-:(7-..vy ( \ i.\7/'/': I'RAcTk i-:. liiiiL;fil (in llicir Idwt'i sides, and srat im a rulihcr insirtion led into \hv ir(.)n frame; tlu'\' arc clDsrd li\- hand, an in a it' I L,'i"a"v'iT \-« irairiaiji. , ii V\\ t /■'ILTKAT/OX OF >7./.U/-; 279 \;n luini-jiuHip iiiav ]ic usol. uiin ii wmiiIiI dljMati.' t lir tuit'ssilv for plariii.L; a .sulutu >ii-mihiij 20 {n .'{() ft. l>clu\v tlic tilt(.T-k\cl. in cases wIrtc such an arran,L,'i-'nu lit mi' 1- \ir dil'tiiult 'ir uiiiK sli-atilo. Tlu' filliT-l('a\ cs arr plan il in \hv > i intaiiiinL;-li()\ at a (iistaiue from each utlKr nt almut inuv iiulus frdtn rmtrc to rent re, and arc then rrady to lir coniU'Ctcil with the Naiuimi-druni. One space is usually litl \acant niidwa}' alotn,- the ]>n\ to allow acress t(j the surlaci' ot the leaf for purposes cjf measuring,' the foriiiation of the i-ake, and also of adniiuin.L; an t'lettrit- li,L;ht to ol.->er\e its condition after tlic eliar;,'e of jnilj) lias liecn withdrawn. Ijloeks of wo(]d arc fastened on ihc shelves that earrv the lilterdeaf liars to aet as sjiaeirs between tile lea\es. and it is ;,'enerall\- found ad- \isatile also to -jse a lini' of Moeks or iron elanijis down the eeiitre of 'he row of frames to prevent the liars from sa^L^Ki".!,' horizoiitallv tcjward one another under the wei^jlu of tli.' eake. The ends ot the liars, too, need to he held down in their places liv wooden luittons. to prcvi'iU them from tloalin.L,' u]i li\- the action of the liou>anc\- of tnc thick jiulji. A 4-in. pipe runs the wliole len>,'th of one side of the contaitiin'^- liox, and lias a nuinlicr of small horizontal lioli's liored in it, one exattl\- o\er each filtcrdeaf: into tacli hole is si re wed a Jdn, ni])plc and plui,'-coek, on the further side 5i. Thus, liv unscrewin.i,' the unmn ,inv nuiividual k'af ma\ lie disconnceti'il and renvivi'd from the ho.\ in a few mii :tes. At each end of the 4-in. pipe is a (]uick-oi)emm,' \alve ; one is (.■onnected with the \acuuni-drum, and by opening; it the suition is ajiiilied to the filters. The other unites with a low-pressure water-service of about L'O ft. head, and throu";h it water is admitted between the two sheets of can\as for the jiurpose of detachin.i,' the residiK'-take prior to disehari,nn,t,'. There is als(; a j'-in. jiipt' runniii,t,' all around the top of the bo.\ ; this has holes pierced in its under side, and is connected with a small s;)luti()n-vat above: its function is to form a sprav to wash down the sides of the box when the pulji is withdrawn, so as to reduce to a minimum the amount of slime introduced into the solution-vat when the subsequent wash is thrown back, and also ;:; immir.iic tnc loss ol vaiUaide soiuium m eases wiii'ie, as at iC l-Ii:i'l<.\Tln\ ()/■ ^I.IMI-: 281 \'iri,'iiiia ("il\-, a u .itir-wash tillnws dirirll) cm ttic uil lidrawal lit the stirphis pulp ami is iliM'har.;r'l with t!u' rcsKhu-rakis. Till' iliar>^'i' >\\mv. atUT liciiii,' trcatcl 1,\- ai,'italiijii in llic urdiiiarx \va\ , hut iimI liavini; rrrci\T(i anv siil.siM|ucnt u-aslirs, is allMWrd In M'WV- inr J. \ Ikjui's in tln' irratiiirnl \at. When the ili-ar siiluiinn ha^ hrcn 'k'( aiitcil, \hv ihar,u;t' is stirrni up ami run into a cK^p set i Irnu-nl -vat . (if whuli tluTr arr \]\wv m use at the prrsrnt IllUr, Ilrl-f It srttlrs. Usuallx' I'ur two (ir tllR'C (ia\'S, and truni lim', after lirin:^ (Ircanlrd as rluscl\- ;is |i(>s-,ililf, it is takm (liriHll\^ inici \\\v tiltcT. This ilH'thn.l ,.f fcfdm:^' the tiller wurks well wit h tlir pceuiiar slinir under diseussioii. hut fur the nimv ordinarx' kinds uf slmie and partieularl\- when there is inueli line silica present, it is fciund aih'isahle tn ha\i- the stutk iiulji-vat titled with a ineehanieal stirnnLj-.Lrear id kccji the slinie from setthns,' t(in hard f.ir iiunip- inur and tn L,'i\i' a huinoi^'eneiius ]iriiduet tn the tiller. All transfers in eniineelinn with t he fillerini; prneess are jier- tortned hy a sin.Ljle ti-in. eentrifu.Ljal jiunip isee i'ii,'. :iNi with \alves ami lexers sn arran<,'e' look (.(jinplieated on paper, hut it is perfeetlv simple for the ojierator. and a new hand will learn the whole routine in a coui)le of days. Within easv reach are. tirsl. the clutelidever for startini.,' and stoppin;.,' tlie ti-in. jiumj). ami another for the 4-m. C(.'ninfui;al used for emjityin!.,' the drain solution sump; .second, two small winches connected with wire-i'ord with the two .'5-wa\' valves, each havini,' a dial indicator visihlc from his station to show exactly the ])osilion c.f the valve; third, four injn handles projeetini; throu>,'h the floor at his feet , for opening' and closing; the st raieht -way valves of tlie svsicm; these also are markeil. so that there ma> he no mistake. Within three feet v.i where he stands the tilter-hox is situated, and close alon,i,'side is the v.aeuum-drum with its mcreury-gau<4e. and ^'atc for opening' ami ciosini; liie main vacuum-pipe; and M) tt. awav. on the same ill i 'JSJ A7-.(/' Vy (V 1 \7/'/-: I'KM TH I-: lt\rl. i-< the \; water I'l llir Ua\i.'S fur drtacliiiiK' tllr cakr. Tlius. the niih' ' n. lasii ms nil which hr ilciil iHuNr niuro Ihaii a Irw l\rl a\\a\' trmii his italmn arc. (ii when lie has tu ^;<) lirlnw \n iiianiiiulatf ihr (iisrharL;e-ili>, the sjirax- of solution is turned on, washini,' down tlie sides and bottom, and reTno\in,i,' an\- li^'ht slime that may be adherin,!,' to them. As soon as the last of the pulj) has been femii\cd. tlu' main slime-\alve is closed, ;ind another one is opened to admit preci])i- tated solution to the puni[). b\- wliich means the filters with their adlierint; cakes are aijain complctel\- cowred with li(|uor. As soon as this has been accom]lli^hed the air-vahe is closed, and the full \acuum a second time thrown on the lea\'es, so as to draw the wash-solution through the cake and displace th.t dissolved ,i;old and silver ci.mtained therein, the le\el beinj; maintaineil, as lud'ore, s(j as to keep all lilterini,' surface coxereil with solution. The time re(|uired for this wash vanes witi; the thickness of the cake and the (luamity ot solution that it is deemed desirable to pass II .'M KlA l:\ I ( )- Willi: I'KAl I It /■:. k:;1 llimtn^h It As ;i yu\v n is Icnui'l that l'\ ■Irawiiv^ tlif^U'^li .111 ,ltll>'UIlt lit li(|\liir iMjUal tn tWHC the alllnutlt ut tllnlstUtr IliM 111 t he laki' .1 sutlii ictit disjihu cuiciit is ct'ln tcil ti ir |ir:u i n .il fi'i|uirr- Dictils 111 lascs. linwi'xrf, \\lic'r till' sdhitiMii air(itii|iaii\ uil; tlif |iul|i Is cspciialK ncli in i,'iiM aH'l sihcf. a wash rinial 111 i|uan- tit\- t(i tiiii'c tiiiirs that III tlir mnisttii'i' 111 the la'r iiia\ lia\r In 111' l,'!\rtl W'h.rll the washill'^ prmrss has lirrll i-iiiiMllllr.l li.llii I imu'^h. the \'utuim is a,i;ain lnwi rcil. ami li\ re set tiii'^' the :{-\\a\- \al\(s thr frniainiiii; snhitiun is f't tiriicil tu the \ at uluiur it catiH'. iSic iliai,'rain ut imiiiii iiiiiiitrtiuiis, [-'il;. 'M > 'I'lic sDlutmn- \al\c IS tlun iliisni aini water is tlimwii tlirnu'^li tin- riiinmuii (i-iii pipe until tin- tiltcr Icaxrs arc a,L;aiii su!inicrL;cil ; tiir \aimim Is imt Mil tiir a tew tninutLS tu ilispjacr an\- snlutuiii tliat nia\ lie ixiiiL,' 111 tlir pipi'S, and is tlu'ii t'iitir(.l\- rtit nt't' and tin- \al\f is iipnird; watrr then cntrrs caili leaf thrmi^h tlic \aiuum inn- nrrtiiMis. tlirnwini; iitV the lakr. which drops tn the Imtt'iin. and rlcatisini,' the can^'as in prrparatiuti tnr the nrxt rhari^'c. All that iiiiw ix'iiiams tn lie dmu- is tu nprn thr tmir disihar,L;r-di " irs and allnw tlu' ciintints. Imth watrr and hard sliiui', tn ,i;ra\iliitr tn tin- wastr-daiii, npcii the end dnnrs. and wash nut the intirinr tlinr- nu'^hh' with tin- hnsr. At'icr (.Insini,' all thr dnnrs thi' hitrr is reads' fnr a new ihart,'i'. l'reri]iitatcil snlutinn is nut iinariahh used Inr di.>plaein'^' the \alualile ninistureiii the lake ; when the sinek nt snlutmn m eireulatinn thrnuuli tin- plant is Inw, it is l.rnui;ht u]! tn tmlk ti\- usiiv^' wati r instead nt snlutinn fnr this ]nir]inse, m this easi nt eniirsi.', the neeessitv fnr a transfefenee alter washing; is reillnxed. and. wlun the re(|uisite nunilier nf Inns nf water has lieeti drawn thrnu^di the eake it is at miee disehar,i,'ed, tni^ether with all the surplus water reniainiii'-; in the hnx. Ill Inealities where water is searee it is nnt necessary tn wasti' all the water standing,' in the hnx at the time the eake is tlirnwn ntf: liefniX' duinjiiiit; the residue, this water may he decanted to the level nf the slinie and stnrcii fnr further use. At the .Miiias I'rietas plant nf Charles Mutters & Co.. enni- ]ireSsed air alnnc is usid for drn|)piny; tlic cake, and the ixsiilue is run nut tn the dump in lars. The use n\ water and air tni^elher. hnwever. as alnaih' descrilKil. is considered an imprnvcmcnl. WORKIXi; COSTS AT VIKC.I.MA CITY. The two chief it<'nis nf expense are pnwer and lahnr. I-II.I KM l(i\ Oh >I.IMI:. _'s- I l-.iti'ir .\^aln.iil\ >i .itn I . I he tilhr riiniiiis i iiil\ i mr man "II I '^ 11 1 1 ->liili , nr I hni' men \<>r _' I liciurs. Takmi; I lie rair ot wa-i s a- >;:{ piT S I Mill |- sliiii , lii,. 1,1 1 "jf 1,1 II \m11 anii.iiiu ),, S!» i,,r lian'lliii'j !."(( tipii^ 111 >htiif. Ml- t), per lull -'- I'liwir Thr pniuipal (li\ isKiii-- ,irr, I he 1) in ccnt.ili al, lla- l-in cinl ntiiL;al. llu- \ arunni -piiiii]i, ani! llic mtv K I'-piin.p f. .r supphuii; thr tank w^v<\ to tiinii-,li lie ,(•-p!■^^^un■ t«.r sluu iii'^ i.nl the rcsi.lur. 'I'lif walrr umiI lur tillmL; tin- hux aii'l tur i lirMWin- nil lilt' take IS i,'ra\ilalr.l iiitd ini |ilant aii'l ii-r> ik, powrr p,,^ 'I'lif ti-in i(ntnliii,'al niakis I . Hll r p in , ami w lim ninniiv^' takrs _'.' h ji. DuniiL; utu' npiration dt' tlir tilttr tins |>iniip run-- a> lullous; "piT.iti-n M, „,,!.•.. I'lllnii; wit li jiiilp IJ MatntainiiiL,' pulp at (UU' \v\v\ ," Ivm]it \in,i; |2 I'illmi; wit li snlutinti ]2 Maintamini; runstant K\rl ;> l--nipi\ ini,' 12 I'lllini,' with waUT 12 Total 70 Till' linwiTllscd is tlu'l"C'ti)iv r(Hii\alcllt tu J!) lip. lltv I'nwtf, as supiilicd hy tln' lilcctrir Puwer Cmnpanw ros's appfdxiniatth- Ir. piT li.]). lir.. SCI tlR' lost (it runnint,' the tiMti. pump is _".tr. tor (.■ai'li charj,H', or l..";4(.'. per ton. Till' 4-in.iTntrit'u,i,'al pumji makes I.HdO r.p.m. and ti.ses 10 h p. Durm.i,' onr (iiHTaiioii it runs '.\A min., equal to (i.." lip, l:r . '^ixini; a iDst nt .'.()(. tor (.■atli ihart,'e. or ()..'-{o. per ton of slimu. The \aruuni-pump runs 2 Iir. 20 min. for caili iliar,i,'(.', tak- ing' N h.p. or IS.li h.p. hr., ecjual to IS.Iic. cjr Ic per ton. The water-serviee pump runs alioul 10 hr. per KlA l:\ I ( )\\'ll>l'. I'l<\( lit /•;. ti in piuiip I III iiiiniip \',ii Ulllll |illlllli WaUr-M r\ u f Per T..n SO (11.-, I II llll.'id II III (III II lllljll Tut,, I -11 ICillt '■\ Ki |Mir> Tin unsciiuciii c ari- liioso til tlir ti 111 punip AI'Miii 'iiui- a iiinnili tlii^ |iiiiii]i iircils: I \i.i\v i>l liiu rs 1 disc I sliaft Mrrliani' ■> lal">r i _' lir. at .",IK S_' nil n :;" I SI I I nil Total Its 1 ,- Tlii^ l'"r l,"lllt tuns t;i\rs a Ki>t 'if _'( [.(rtmi Tiir ninniiiL; fX[icn-.f> \s ill l>r: I'liwi r . Rcijaifs Ti\ atiti'' lra\( -^ w itli acid I'lT T. m SI I I Mil II I II li.'tilt n iiii_>il II iiir.il Tutal SI) III71 These fi;..;ure> wrre rutniiileil when (iiil\ line liltcr-liox was in use, siiiee then a steuiKl has lieeil installed, and as one ni;in .attends to hiilll, the eost (it lalmr ll.i^ ei inie dnwn to ;!e, per ton. ^llo\\■in^' a total workni'^ eo^i ,,] ahoin Ne. per ton of ^linie. .\i)Ti;S nX Wi ikKl.Xi;,— It will l.e notuvd from what has heeii said ahout \\a>liin,u;, that the praeliee ,at \'ir,t;inia Cite at this time w a'^ to nse eii her a sohit ion-w.-i-,h or a w .ate r- wash , tun noi both on ane ;4i\-en elia!-;^'e The reason f.ir this wa-- that t'l'' pa.rtieiilar shiiie lieiiiL; lre;ile(l was siU'h that it would not stand hein;,; twiec exposed to the action of the air without er.icks forinins,' in the C'lkc, This, howe\er. i-~ not tlie ease with all shnies, and it is usualh- found th.at a wasli of solution tr.,i\' first lie <'i\en and then i-ii.i i< \i h'\ Kh -^i.iMj-:. 287 .1 fiirllKi- [.triu.l I.I w .it( r-wa^li, W lit re [iii>Ml.Ir \\n,- laiur :irf,iiii:iiiu III i> inrlrr.iMr, lnTauso. as a rule, wluti iisinj,' water .il' .lie II Is nil| instil. Ir I'l i^'JM' a sllftirK III inialll ll \ lur ctTri I i\ r i!l-- plarciiiciit wiihiiul I '\ ii>I(i(,-kini,' llir plaiil with wiak s(,nii|,,n. \\liuli liiiallv has in In run In wasir, anil llu- L:ninL^ "t an ailc- iliiatc wash wiih liarnn si,hiiinn, tulldWi'il l.\ a i|uaniii\ nl water siitVicicnt to ciinipcTisalr fur tin ilailv Iiks, s m i hi stm k. anil tlnis •l 0', VIRGINIA CiTV FlLTtR- PRECl P 1 T A TE t) SOLUT ASS AV S - GOLD 'o OK. i5 !o -^s f.<". 7,". ao WA'=iMlMO CV.)Rve. ONI uc, edtmpoghout. - '^ 1 Lv E n o 07 Oi. lOTj liO 1^^ tDO H.S tflO - » oo V J . 1 O 93 90 o as o ao T3 O TO O <>5 OOO 55 O 30 045 o to 35 5C 0*5 \ ' - r- 1 \ 1 i \ \ ■ 1 '\ ' 1 I i \\ ' \ 1 \ ' ! \ \ ! \ 1 ! s. i . i i j >y 1 , 1 1 O 15 O iO 05 1 i !"^ 1 1 ■ t- ■■ ! ■ - . 1 i l-i-, -M). ilisplaeiiiL; as nnu h as iiossiMr nf the r\anitlr ivniairiiiL; in the cake, s^aiiiTallv rrsults in a better sa\-iiit; of i'\ani llir i|uant!i\' "I S'lhiiion ilial i-- ilrawn llinni'^h it; m a L^urii linii- I In-. \'arii-> l.i'lwrcii wnlr limit-- 'Aitli (lillrvml cla-M-- nf -liiiir I-"i-, ^illaml 4(iarc t w m (harts if the frsults u|' llir wash at \'iix'inia ('i1\' 'I'luTr is an mtirx'al i>! twn nr tlircr wiTks l.ctwcrn tlur In "iir ut' thciii sMlutinii al'iiic was iisr'l, aili] in thr (itlur, water. 'I'lu' fate nl prfii ilat !■ in was Is Iniis |irr ♦ / ;s . ! R G 1 N A C 1 T Y WAT -1^ *pO r 1 u T E R - w iv ^ M 1 r-.J t R US ED T M POU C o c M O ' 1?.^ T. i"30 Ib5 '9 J .^.« \ / .05L --N 1 1 ' 1 i ! 93 O.90 O 80 O 60 O T5 o ro O 6S 6o O 55 O SO O 'VS i \- 1 ^ ' t \ \ \ I \' V ' \ ' ' 1 ■ ' \ . : ! . 1 \ : ' 1 1 O-40 O 55 i \ ! ' ' ^ ; ' ^ • ■■ ! ' \' ' i 1 ; ■ ': ! O 50 0*5 o eo O 15 O 10 O 05 o 1 \ 1 : \ " ! i ' 1 >^ ' 1 l\ i ! ' 1 — - ■ — 1 1 N I ' - 1 X-^^^U... ' i " — — — ^ — ■ , I'l- 411. hnur ill rai'li rasi.' ; wciijhl nf —"■' Z".' ",*."".-; «• -- o •IT- •-70 5 bO 5 30 • 9 3<> -M «b T'a 9o ic>a ilo lis lie 1*3 >Co : i i ' . ( —A ■ 1 t p^ ! ' 1 \ : i \ 1 ■S i'O \ i 1 5 10 1 ; \ i ! ! 1 \ 1 ' S JO \ H Bo \ 1 ' ' U.TO ' ' \ ! ' ' \ ■ \ ■ it a.0 ►i '0 1 \ ' ' : ■ I 1 ' ■ ; 1 \ 1 i i ' \ ' i { 1 do 1 bo 1 . ro I.bO i i \ , \ 1 ■ i ' \ ' ! 1 - i \ 1 1 ! 1 -50 r 3o r.Ho r.(o foo 90 o.«o TO o eo 0,50 to O iO O.fto O. lO o ' ' i i ! 1 — — 1 1 I IT 7T ) I \ ' \ t j 1 [ 1 i ' 1 . .1 1 1 1 ! \ 1 1 1 1 ' — ! ! \ 1 i ' \ 1 -^ \ 1 ___ 1 1 W-! ' ' ' 1 ■ . ■ ___^ ■--_ l-'it;- 11. 29U Ni-A i-:.\T ( wwini-: i'k.k in i-:. perruhili'iii was L's tcni-^ prr Ikjui', i|uaiuit\- <.!' ilr\- slinir, In tiiiis; 111 1)1 >l WW in tlu' cakr. Js ]h r cvn\ . W'hru I'uiisiili'riiiL; the roiitciits nf the sukitiun ilraiiiiii'^' I'niin thv tiltri' iu>t lu'liirr ill.M'liar;^!!!;,'. it will lie ul iNiou^, t hat I his assa\' (loL's tint nsuall\- fciirrsnit the suhihlr s^'oM ami sil\Tr Irft in I hr cake. W'hrvi' w'atiT or l.at'rcti suhitioti is iis( .1 I'ur thr wash im [HirtiMii (it thi' I'rsiiliial iiiMismri' will a--sa\' as hii;h as that whirh has alrrail\' ruiiii' out, anil the a\aTa,L,'t' of it will he iiuu'h lower; for rxainplr, if thr last solution from the lakr shouM a^sa\-. Irt us su]i]iosr. 2l)i'. per ton, the nioisiurr reiiiainiin,' lu'liiml wouhl |irii!ialil\- awrai,'r onl\- KIc. or less, and as tlu-ri' will hr onl\- half a ton ot It I'oiitainrd in a ton of ilr\ shnir the assa\- of 1 lu' rrsiihic Would lie raised therel>\- oiiIn' "e. per ton. an iiieri'ase tiiat esi\-e clura- tion onee or twice a month, taking; stimples of the issuing,' solution penoijically, and jilottniL,' as a cur\-e the timires so olitained; it will then he easw if the rate of percolation is known, to set the \'alue recox'ered at an\- ijiveii ]ioint aijaiiist the cost of olitainiiiL; it. and in this way to determine the j)rotitalile limit to place on the period of wasliim;. The (juestion of sa\ in.i,' c\anide will not enter lart'eh into this matter of wash-duration, liectiuse the t\anide can onl\ lie ilis- placed li\- water, and the amount of the latter usi'd, as alread\- [lointed out, will he di'termined h\- the daih' losses i at the expense of runninj,' to waste wi'ak c\anide solution from some other ]).irt of the jilaiit. ,Se\eral eurx'es sliowint,' the ])ro,L;ressive elimination of c\ani(k' from the cake ha\e heen made, hut as tliev wi're not consistent with the i,'old and sihcr curws made at the same time tlie\- are not j^ixen here, and the matter is still undiT investi.i,'alion. Tile following; is a tah'le (if the time neeiled (withti '1 in. cake) for the \arious operatiiJiis. taken directly from the filter loj,'-hook at \'irj,'ini.i Cit v; FILTRATIOX OF SJJME. 'Jill Mr. Min. Filling' and takinj; on cake 4") Rfmox'inj,' surplus I'ulp and rf-fillin^' witli soluliim -•" Drawing; wash-solution throu;,'h lako 1 l-". Re])l;uinj,' solution 1>\' water, throwing' off taki', disrhar,i,'in^', sluitinu; out, and rc-rlosinj,' doors .3.' Ti'tal tmic (if operation 3 Till' jiertentaiji' i;?e ma\- be as much as _'." t(jns per charge, mak- mg '-'00 tons (jr more ]tvr 24 hours. The con the greater will bi' tlii' capai.it\' of a gi'.cn filter unit in a gi\cn time. Of cnursi', thert^ is a limit in the con- sistence. be\-ond which the lhickne\' Ol- >IJMF. _".t;i span'-- Tlu'\' ari' [ilaccil in the arid liath ami alli)\\ril to uMiiaiii tniali.iut siy 'luur-. at tln' i-mi^if uiiirli tmic \hv\ arr iTmnxr'l. liraiiU'l, ami plaicl in a wait r-t.m\ In stii[) the artmn tn a prrlert wiirkmi,' romlitinii. till' stfriii^'tli ■ -; the acni ina\- he i uTcas"il to live nr si\ ]i(.T I fii! . anil a \-aviiuni arran^ftnc'it a.ttaclvi in llu-in for draw in '^' tlif S' ilnti. in lliniii'^h tlir tilifc fcpi'alcilh-. until all the ilt'iiusit is iTtmj\f(l. Instead lit' inntinually a'lilini; and tn re-st rcni^'thcn tiir liatli.it ishcttcr t(i turn the wdink' lii|U'ir tn wastr at short intt'r- \'als. In'canst' it is liaMc sunn tu i;i.'t (.liarLjcd with salts, whirh, it mit iir'i|nf]\' washed nut frmn the leaves with watiT, ina\' he [ifeeipitated in the lihre lit' the ean\"as when next it I'lmies m enii- taet with the alkaline Sdluimtl. 'I'll L,'et the hiL;he'-t el'tieiene\- frnin thistilter it is inipiirtant tn iiiake the ti'aiister nt jiulp and siilutnm a^ rapidl\' as pussiliK', and this t'lr two reasdiis: (li It inatenalle inefeases tlie eapaeit\- it lessens the lialiilit\- (if the eake ti i eraek when expnsed ti i I he air, and in ! lie ease nf slinie tliat has an exeejitinnal iiredispnsitiiiti ti> craek, it i"enders it possihle tii '^]\r a diiulile wash, nf snlutinii, fnljnweil li\- water, when (jtlier- wise nn]\- a sin.l^le wash enuld ha\c lieeil applied, h'ni .1 rapid transfer nf the pulp ami --nhitinn I he ,L;ra\"it \' s\-steiii (if lilhllL: and einptxini,; the Inx t,'i\' - eXi'elK'ilt results. The i;eneral arran;.4i,'n!ent is slinwn m i"i'.,', 42. thnii,i,di there a water- wash nnl\ IS ]irn\ideil fnr, L'sUallx .1 srennd \al at the le\el <)i I' is prn\ii!ed tn reeeue the surplus snliitmn. and alsn a third \-al fnr surplus water where tlu' dnulile wash is ,L;i\en ami where the water IS sutfieieiitlv- wilualile t.> le sa\"ed fnr re-iise. The niethnd n'i wnrkiii'.^' is tn till llu' hnx with pulp li\- ;4ra\it\' thrnuijh twn nr ninre (i-iii iiijiedines frniii the feed-\at al)n\-e: then after takin.i; nil the eaki tii let nut the surplus llirnuL;h the disehart,'e .t^'ates into \at ('. whieli has a li,'^'lit stirrint,' i;ear tn keep thi' slinie in sus- peiisinn wdiile n is heiiv^ thrnwn haek li\- a -tdn, eetUrifu^al jiuinp tn tlic leed-\at alin\e The same prnees, is then re|)ealed with the wash snlutinn, and ai,'ain with tlu' \\ater if ileeessarx". eaeh in turn lieiiiL; thrnwn haek tn the hii,'lier Ie\el liy tin' same i in punip In this w;i\- the linx ni,'i\' lie filled in tnlirnr ti\'e niiiiij.njs :iji.l ijiiii.i- tied in three minutes, sn that the eaki' is expn,si'd i Hi tf K it J X >- W • *n ■lii: I ' 5ti J <1 o Mr »! u < > u o CO rn.TNAi ii>\ (//•■ SUM I-:. ■2'.\-, about t;^'ht iiiimitrs tor caiii iratistfr: this is a <^'rcat aihaiitatjc \v!nTf a >linu' slmws a icinlcncv Id crai k, Tiic arraii,L;rmrnt is cliiftiy applicaliji' wlurc the mill-, ilr is (Hi llu' side ut a lull ; ti>rlc\cl siti's tlu' ]lump-s^■^t^■In is iisiiall\ iikjt suitalilc. l-!\' tlir lattt -. nf t'oursi', nsulls similar Idtlmsr nl tlu' i;ra\italinn s\sti'm ma\' In- ohtaiiU'il liy iisint,' a siitfii icnt 1\- lai\'r iiiiiiip ami piiir-linr, Imt wIktc till- sit(.' is ta\ iiral.lr tn ,i;ravitalii>n tlii> lias tin- ail\aiitaj,'r cit a rapiijitx' nl iiaiist\-r williout tlu' smldi'ii swil ''i>i- on and utY o! a lK>a\\- Iliad at s'lon intirxals with its atlriidant strains on till' sdiiric 1)1 jiiiwrr and tlif niarhinrr\' in i,'ciK'ral, the jiowtT usimI Ixin;,' i(imjiarati\ rl\ small in anidiint and ( \i'nK' distributed Rrti'rnui' li.i> 1.1 rii iiiatlr li> I he ihiHiiil; ]ir:u tu-f (jI the ( iuaila- hiat'i Kriliutiiin \ Mines ("d. in >]h akiiii; i.f tlic Hustn-- plant. It ik'sciAi's turtlur i i in^i, ],■.■,, j,, ,„ Alt li. nv^'li the ]irM]i,.i-l\ was aii|uir((i m Jannar\ , I'.tdl. it was nm until l-\liiuai\ . I'.M).',. that It was ilrri.k- ,,n a lar,L;c as well as a small seak-, had alfradx' ■ knicnstratrd that a hi.i^ii r\trarti'>n nt'l,.,th sihrrand i;mM i..uM 111- nlitaini'il trnin tin- orr \>y ex anulatinn. ami the cxiu-nnitnt.il Iilanl liccanu' (.I'^rcat Sfr\-iii' in tvstini,' urt-^ fnnn iliU'cffiit parts nf the iiilllpanx's pi'i ipirtU'S. a^ Wi-ll as tu ^ui-r.^'est the detail lllaiiijiu- latiiin lii-st adapted tur the iiiaiii |ilant, then under i'(in--t ruitinii. T!h' mines are a mile tVn'M ( ' ua..aiuatii, and there afr im >treams axailalile tor di--]M)sal i il' 1 iie tailing ; imr is there t he s]iare iiei cssarx' tiir ai'eumulatiiiL; ii'^idue on a lar-c -rale. It lieeamc neee-~sar\- to disehar,i;e the tailing; into tin- main stream ut" the distriet mie nuk" trcjm tlu' mines, and this meant thr t rtmspnrtat inn nt all ori'S thriiuL;li the heart ol the C'it\' n\"er an vxpt-nsiw' railrnad >\ stem 111- the eiiinplete separatiuii lit' the stamp-mill t>i>m the i\-aniile plant . the latter ti) lie placi'd upnn tile main stream The llnniestake sNsiein, (it eiin\e\in'4 the tailiiiL;' in :i ea-t-irun se\vi'r-pi]ie was adopted; it is an ,S-in, water-pipe of hell and spi,L,'iit tvpe, as]ihalted. larl for its tir^t t'ew" lumdrrd feet at a ;^rado of.'5',,tl!en tlattenii)'^' to _", ' , .\> it wa- desiraMe to set t le and return tor re-use as mueh of the wat'-r eomini,^' from the eonei'ii- trators as possihle. allowing; the thiek ]iulp onl\ to pass thmuudi tlir piiH', and to detcniniie to what point sueh thu'kemm,' was possilije. sexeral hundred feet of the pipe to he etllploxed 111 this Work Were jnit to',^'etlier and laid out ujion the tietual urade. .\ rr.'mi^^enieni s \\-i_'re maak.' ''■ i.'ir'/ulati-' attv' |-'i\"en iiuatttitV' of saivl. crushed in the stamps of the experimental plant alre;id\- installed. OLD .\\l) .\l:\\' \ll:llllU)^ \ I i,r \\ _\ H\Ti> I'M tlii'iiui;li till-. |iipc-liiii' ;il :in\- ili siml i1i'l;i'ic' 'if ■lihiluiii I'ulp w;is tir--l t flcil :il a III inii.il dilu! Mil i jI' S (,l w an r td I . .t ..ainl , 111-.1 a> il I aiiic iTMiii I !ir tail nl t hr n nK liit rat < T laMr^ , t hr wall r w a-. I lull iliiaiitril li\- ^lu I ('--^n t- str]i^, I liirkciutiL; llir in!i|i. and matimI n^l^ \vi '■(■ iiiaili- iiiulrr tlu-^c \ar\iiis^' 1 1 itiili' 1. ms. It w.i^ iKsind t.i riini)\.' a iiiaxiiiium nl" unr liall nl thr n'-i'^iiial watrf. ami 111 tia- (Aprniiinit s t hr \ ti I I ]iiil]i w a-, rnhu td t' I ■_' ' ti 1 I . and m > sui ics> tull\- t hat llMi iinl\ \\a^ the pipr tint i h.;_;L;fd with sand, hut thr |'lll|i I ^■JjAr ili.IJi^ l''i;; II \'']v fur ( '1 >n\c\ itiu Tailing; at that Ihickntss IkuI siu'li raiiiditx- cf' rluw thai it iX'adih rarrud nuts and ntluT lira\ \- cilijcits witlmut intt ri-u]itin^' i hr sti-cani. Tests maik' 1)\- Mr. Carlos \'an Law iiniMij that \)\\\\i whu'li has liassiMl tlir()U,t,di a ;ill-nHsli screen, with water in the jir(i])iirtic)n of 7J to 1. will (low tIii-<)U<,'h a launder of sijuare eruss-seetion. made of rou,L,'h hoards, set on a i^rrade of I.J',. With a X'-shapid wooden launder, sueh pulp will flow at less j^'rade and with less water. The area ol the wet perimeter is the faetor. ■J! IS KlA l:\ I ( ) \ MIH: I'KAl I It i: 'l"ln^ JPI. )lilrlll s( t 1 Ird, tile pIiK rs^ \\,i^ ( ml llllnl .^^ liilluu ^: 'I'lu- ()!■(.■ is t iiiii^iM iiti il (i\ ri' a iMilniail tr( piii 1 hi' iiliiu-. m lin]>| j( |- I mili )!n i.ars, which iIim hari:'' mii' a hiri;r hin al thr ■ ru'-hcr plant. Il i> ihiii passcil thnni'^h a >' i .". 1) CiaUs i riishc r l" _' in si/c, lisi har;.4in'4 uxcr a pu kiiv^ lull Ini- niiinval ut wastr, llini rc- cruslu-il li\ a slmn Iumi! Xh I (iatcs (.riislii r In 1 in rin'4. thru rriniixTil \i\ i(in\i \ or lulls m thr null Inns, wlu ir it i-. disl iilam 'I liv ears, this lowiiii,' lu , lua]j lal nr . pinx mi; inijiT ci niiun.ii .al tli.m the tls'- .if ,1 s\ strlll lit I I iin i'\ I ir-lirll s iivcr thr tup ot ,1 hill Willi auiDni.itK inppcrs. The iiiill-liin has a I'.iii.uil v tor li\r ilays. whiili. lM_;cthri' with thr lari,'i- Inn at llu- rfiishrr plant, al'lnfiis siillic lent stiiraijc i it n\\- '\'\\y lire is tlun iiushnl iimUr iiL;lit\ 1 .ll.'.D-Ui, stamps nf .\llis-('lialnurs make. Tln' murtars ai\' set nn ,i idncnti' Inunilal imii. tin- an\il liliuk lirim; rast as an iiitrLjial part ul the ninilar. 'i'lu- latt< r has a stcrl liiirf, iwn mclics thuk. hut tlicfr is i;{,.' in. of niiial luliiw till' liniT. Rrtwrcn the an\il-lilin k ami ihr cnn- irctf a iniarti r iiirli sluct ')f rulilit r is s|,,-(..i(!. The iiKirtar has a hniail I'a-.!' Uli in. wi'li pn>\'i(iiii with striiiiL; nhs at thr sides. 'riif :i() nirsh pul]) ftsnltini; frmn the stainpmi,; is runciiit rated ()\er \\'illle\ tallies, a euitsideralile aiiiuunt lit middling,' pri iditeed hem;.; reiniiMcl tnr re-'.;rindin'.4 in an Ahhe liihe-mitl and suhse- i|uent treatnu'iit dwy separ.ale enneent ratnr t.ahles. Thelailin'4 friim ,all the niailiiiies di'i ip> mill i niiei'ete Launders .am! jiasses tn the ■ lines Aheri' alnml hall nt tlie w'.ater is remnved tnr use in tlii' null 'Idle ihiekeiied tailiiv.,' then enters an Ndn. la.sl -irun jiipe. l.aid I 111 the i;raik' ahiAe mentinned. an.! ,L;.ies tn tin- elassitiers in the Ilaeieiiihi I'liires, situate.! upnii the m.iiii eli.anne! ut till' Ciuan.i- juatn ri\er. The elassitit'rs are all ut the llunieslake l\'pe. two Sets lit emies heim; use'!, the lower mie taking tile holtolll ]iroi!uet ot tile upper. The o\ erilow troiii hiitli sets of eoiles i.;oes to the slime-plant, the lower euiie liaxant,' an asei'iidiiii,' eiirreiit of water. Tile sail.! eoniir.i,' from the liotlom of the lower lones is dis- triliuled. hv tlie Hutters >.V Mein dexiee. into either of two reeei\in.i,'-\ats. eaeli iif :i."ll tons eapaeitw These were jilaniU'd to Serve an ultimate ca]iaeit\- of .",()() tons daily, with the slime seji- tirated. The receivin^-x'ats are altiTnatelv filled and drained, the discharw Ijeinj; made ■:M'i-ui;h \^i:\\-^"^ i;;itv- ^nto asccndirijr p t'l.n \.\l) A/'.ir Ml:l lh>l» M I.I l.\ \ It \ ; L'liy C()nvj'\-()r-liflts, wiii. h pas'; iimv iltc uniri- .it the liii. i.f ( i},'lit k':i(liini;-\als. c.u h nt ilu- ^anir ^i/.i' as I lir ic 1 1 i\ iti'^-v ,it ^ In i lu sr ■'I I t 'la\ t iiallin 111 ivL;i\rn wuli (I..")', cx.iiuili snluIiMii, tin ^aiiii IiiIII.l; 1 lu'll waslii'l ainl ullitllaIcK dlMliaVi^r.l (ill i oii\ cs i jr-hclts (run 111 11'^' under tlic x.its., whuli ilrluir citln-r iiilo the rncr ilurini; the I aim scastiil, i ir in ilcvaKMl sUiram'-piU - duniii,' I he dr\ season , tn lie shiuid diiiini; llu- siurccdmu; raiiu' scasnii 'I'lie slmic liMin tlir rlassitsiiiL; mius is in-alrd l'\ a^'itaticn uiih nirc haiiic al stirnns; ami larj^'c crntrilui,'al ]>uni|.s, wliu draw trmii the liuttniiis (it the \als and diseliarLje ( i\ ( r I he I ( ips, t lie t ( it al time of tn'atnieiit ln'inj,- tuur da\ s After the liiial wash the slmie is I lumped nil()setthn,i,'-\ats HO ft. lu'^h. where a further decant at ion oi'curs hetore the shnie is (hsiiiai'^ed . with a \iTV small perientaL;e of moisture, into the rncr. The iiilire idaiil, lioth the stamp null and ( \ anide annex, is dcsij^med so that it ean lii' doulilcd. win n the stamp-mill will take a 'lac-k-todiaek form, SO stamjis with their eotueiu rators hi-mj,' on eithiT silk' of the liins. 'Idle i lassifx inj,'-eones and the feet i\in^'- \ats of the ev anidi' annex are of sutfieieiit size alread\- for a .'(lO-ton plant, it liein,i; neeessarv onlv to add another line of fi<4hi liarhiiiL;- \ats and the eorrespondini,' slime ■ its to lirnii,' the e\ ani(l(.' jilant to the larijtr (a]iaeit\' mentioned I'or rootiiiL,'. eorrui,'ated ,L,'al\ aiii;-e(l iron on a steel frame is pre- ferred. As there is no load ol snow to fear, it is possiMi' to use a !ij,'Iit roof-truss. The natne tile is eheapi'r, hut -A re(|uires a lu'avier ennstruelion, and does not alTord as eomjilete proteetioil. The .Vortherner will remark the la\ishiiess of the masonr\- alioul the mines and mills in Mexieo. It is the eheapest kind of eonstrue- tion and the native wood is usuall\- jioor: it will twist and untwist as the drv and wet seasons sutceed eaeli other, niakim,' il an unsatistaetorv sirtietural material. At the lime of ni\- \isit there were i'JO stamjis in operation in the (luanajuato distriet, and there were L'O." tons lieint; treated daily li\- eyanidation and iT) to 'M) tons hv ptitio. Thus does the new drive out the old. In l.S,S7 there were 'M p<;/;<> process, I ha.c the followini: data from liie Haeieiid.i de >an Julio at i'aehuea; if I "ly; t.'i Hu-ii.> Mill, in C.tir^r oi ( '. instni'l !■ m i'l.l> AXn .\IA\ \l/:l lln/is \li.l\\\/rMn, M) Crushiti-. t(j pi^, (ill 111. .h 111 Chil. iM mills, uiih <'\t rlliiw .hsrlKir;,'! ;j ,;,, M;iiiili ii.iiu 1 (I -|, Siill .".' , . (,r "0 l'^ j„ 1 I. ,11 . . I 7.: C'lippfr sulph.iir I., -s. ;,' , I .,- Mi-\-,trv I.M.s. |\ki; tnrraih kil.,L,'ram i.f Mlvcr I :!s 'l'r.iiis|M)ri tniiii ihr mm,- . | ik Tut; IJ ■(; Thcurc 1- hull- In un ilu duni]., Hicn |,,iv the , .,si nf t r,iiis|M,rI i , Itu-lu.lr.l Salt tosts :{.-,/',■.,. s prit.,,1,,, ,(,,„, Mill. hair 2:^) pesos prr ton.aii.l nuniirv .'Ml p,-..,s p, r kil.,-iain Tiir aMia-r I.,..,'. i,,i- tllfVi'arwvn I Im,,| .Mi ki|. .L:raiii I', r kilo^rani uImI\ ...n timi. -I iiiiul ,Ati-a. I1..11 .. as. , Ti'ii.' is ,i,,t .•,.,isi,|,.r.Ml . in \vinl..'r n r<.|nir. s _'il' , l,muril,\ nas..ii ..I i lu' |,,\vrr t. mpiTalurf ..I tlu- all' Al I'arral. in Cliiluialiua, with tin- Russ. 11 pm.fss. nsinv li.\|."si,l[, ;.,;(.. ti-,. ,.,,si ,,(■ li.xiviali.m and r.iastin- is II piw.'s. I.ut t!u' r..',.vi'ry is 11..1 as li!..^|i as il is unli anial'^^anian. .1 in the /',(//,.. u-li.T.. tl-,..,,s! is II 1,, 1 1/',>,..N, \arvinL;a...,nlin- I.iiIh- nian-ancsc c.int.ni ■ .1 1 h.' , ,r.'. •\i I'a' iiu.a, '.\- M.'M.an iii.'t Iki.Is. ilu' i-,,sl ..f tiiiiiin- an.l SMi-tm- ^.r.- am. Hints t.i 1.' /^,',v,..v p.r i,,n; the lransp.,rt t.. ili,' p.,ti\> ami till- trc:,im,'iit th.-rc mak.-s a Iiirllur .ust ..f [J pcs,>s. 11. .t inclu.lm- l.iss.s ,ir the .-ypcns.' ..f marketing,' tic pnnhut lU staiiip-miHin-. pan anial.i;aniati.in. an.l c.nucntrati.m. tin- est ai C.uanauial.. was S pi-s.>s . an.l n..w hs stamp-niilliiv.,' an.l .^ ani.latK.n th.' ...St I. -.s.-; p,-s.iri|itMn> nl liltiTiiiL,' pn m vsst'S, ituluiiin;^ the l^atIl.'V^, .MiHii'c .mil Riili;\\a\- s\>.triiis, ^^mv aii (niii! n a vt-i'c-iit \ivit tu the ]irojii-rt \- nia\' lie of intrrrst. H\- \\a\- of pri'fai, o. aivl In rifix-sh tlir rrailci-"- iiiiikI as In the niaiTl facts, tlic i I' iiiu-stakc I'it; tli I'rd iiHtaiiciti I'lL'Sses. planlsat l.cail. HI llu- Hlai k 1 lills nf Snuth I )aknt a, fimsist nf ;aiiips anil i ru^lnni; aliout 1.0(10 1. i!is per claw 'Plu' must intm stint; fratiifr of t lir null- praclice is the amali^aniatiDn. I'-acli l.altny is jiri)\iik>l wuh < r. I, \ //>/•. /'AM( '//(/, .17- Till; llo.Mh.STAKI-:. •My.<, four full^-iAMl philrs. in si-rirs. each plair hcin- ."4 l.y 144 in. ami lu\. Ihuk, The first is [,lain copptT. l lu' last iliax- arr silvcr-platr.i Tins a.liluiwn «,f tlirrc^ sihrr plans, Ki-'niy l.i cacli III stamps of the AniKus .M(l-hra.ii mill, a total platr-aiTa apaeit\ of al.out 1,.S()II tons per dav. The u.M-ii.-r.i suiiaee ore is erusiie.i m tlie mills at tile iKjrth end of the ■1 ■ ■fill Ri-A i:\ I ( y.wu)}-: I'RAi 1 1( /•;. ]n-i>]iiTt \- i;{()() st;iiii]'>. aiiil \hv s:iii'l Ircalcl in llic aiiiii \ kr.i)\\n as ('N'aiiulr \'n, •_'. al ( '.a\\i!lr. twn null-, ilislant fi'i i!ii L.-i'l Tiiis smalliT plan! lianilK-s ah. ml Mill tuns per dax". I^>lh plants wnv ilcsiijiuii and inslalUd uink'f llio iliriTtiuii ul ('. W. MLrrill, who "1,1; ts Dixh.ir.m' Ironi l'\v,i 1' ,a unilonn tliari,'L' '<{ livilraiilicall\- (listnliutnl saml that will Icarli raj.i.lK-. thr apin'inlcil tii^'uvfs will sri'iii iiu rcilililr. Tlu' k'arlialiK- sand lias thr f(illo\\in;,' awTaijf tcxiurr; ('(larsc (rcniaininL; un KlDnusIi' ;i(l ]ii r init . .Mi(lassini,' 2110 iiicsli i :5N \ivy icnt. 'riinm,i,'h this ]ir'Mhut t'v solution iirrmlatt's at tlu' rate of t'nnn t lii'rc to tuiir iiu lies jirr liotir. When we cdiisiili-r that all thr srparatr'l sluiir pa->>rs tlif(iu,i,'ll 'JOO iinsh. and that this prddiu t is in s, . line a state of di\"isii>ii 'hat '.10' ^ (.t Its wihic ^-trartcd in six lidiirs li\- filtiT- pfrs-,inL,'. tlu' nicnts nf I I.>infstakt' ilassitiratiun s'.stfiii rciiuiiT Tin flirt luTi'inphasis. Tlu' 'nst n{ trratnirnt at C'\-anidc Xo. I, which Mr. .Merrill -ave in MtOH as :5."r.. has siner lien ivdu.id tn L'(k . jicr tnn. At ('\ ailidc .\(i, _', the pHMJiK t treated i> mueh lower 111 ,i;radc\ a\era,L;"int,' onlv ,s.'v'. per ton. This plant was the ninre reeeiitl\- const rueteil of the two, and is the more ]ierteet. not o!il\- m its arran,i,'enient . hut iii its faeilities for niaimainiii'^ ■A low cost ot treatment A sumniar\' of the operatin;< eost for ■~ix nionlhs is ,i,'i\en Inlow. COST KKCOlil) \r HOMKSIAKK CV AMUi; Mil. I, Nd. J. F(M! \.\^y <\\ MONTHS oK HMXi. .luly. .\viit. Sept. del. N'dv. Dec. Total t(jns of Miiui treated . Tiilal (iperaliiig ecist . Cdst jipi- tdii, clas.-iticaliiii; treat tuent . |ireci|iitatiim power assa\in^, retiiiiiijr, eti Toial losl pci lull treated LM,.(i4t >A.m\ -M.H.VJ 2i.\\W ■.>.>..■«)« .*-l,lli.") «4.t)l|(l «;i.!»»! *4.:i>;(l .S4.l-.'-_' .*:ki.'74 .«(),('1X .JO.OIT *0.017.«().(I17 .<(».01(i .*().()•.';{ (),r. I'RAcru I-: at tiii: i"k\ii:^i.\ki-:, .-{(i: '""■'"'"'"'"■ "' ■"'■ 1'"" 'li'' I'uli. I.,r tlu- i.iirp,,s.. ,,t |,n,vi.iin,L,' oxvj,vn l(, the sulKulphi.!,. ,,(■ ,p,n ipvrrlintur- ,,uv .,f tlic. must trouIiU-M.nir (cn^tilurnts ,,f i iu- ,„t an.l s., n .iintainm.i; tlu- cl,s- suhin- pnwrr ..I" tlu- >(,lutiu!i, wln-li unuLl uiluTuis.' \,v n,l,|„.,l wt itsMXNi^r,.,, l,v ,]„. „,„, [^,„,, ,,,-,1,,,^^, ,„,^, [,!;„„^ .„.,, ,-,.,„arkal,lf t.ii- tlu- ,,nlir an.l lUMtncss .xliihncl m wwy .Kpartnuiit . OpiTa- tioiis haw l.rcii iT.kuv.l t., s,, simpU. a sv.-,t,'iii thai ihcv sccni to 1„- work-.iii; autnmatuallv: vrt it' nnv -hm. vs l.clim.l the srnir, ho Im.U .".II Tripl.-x S,,Iui„,n I'.ii,., uitli .M,,i,,r n,,ul,lc-\V..un.l to (livo Full .mil H:ilt" SiK'e.I^. Sli,.\.,~; l-:C)lufni Li\i\iam trcrii Slinu'-Prcsses. ritiils an al.lc coi-p^ of assistants mntinuallx stuilvin;^ special proh- k-ms. looking to the reduction of eosts ami increased ertieieney. Froin the two leaching plants, about l.OOO tons of slime have been run Iu waste, of an avera.ije \alue of between 40e. and '«1.2() per Ion. In workin,ii; out a method for treating this produ. i . Mr, Merrill considered the various slime pn .ces.ses now in favor, but discanlcl them all ;is unsuited to llomeslake cond ons. In -....n.. ct .^\.-,teul iei)imin.i,' III. ! Wo operations ot 30S / 111 the iiiiiiini; ])eri(i' i-eals and ! shall nut attempt here ninre than a lirief ai e(junt of tiie plant. At the l)et;innin,i,'. a lO-ton press with 1 li>' (M't frames was installed for expentiietilal piiri loses and was in use eoiii iiniousl\- for IN months. In one run K5I ehar,yes were treated, on wliieli the tullfiwin.u' data are axailahie: A\-era,u<-' \alne of slime ludore t real men t . (lie. ; after treat nieiit , l!le. l-.xt rait ion li\ assa\ s, \ivv ton inateil, !)() per tent or Nle. ( WWIPf: J'R.\( TICI-: 17 ////■; Ih^Mi-si \KI: :{n!) piT tMH k,o,vfiv.l m prcniMt.il, . p, r f-n tn.itcl. !t| |vr >vnl "r Mi.-, prr ton The trvati.unl ua^ sn„,,lv lixivialmn m the I'lvsv witlu.ut u.uMali.m. Ani.mnt nf s,,l„t„,n us,-l n, lra> 1> .-n.' inn ofshnir. (),7;i t..ns. amount ..l' ual.ruM.l tor s|„„ m-, tour tons lu one tun of shiiu , tlm kncss ,,t ,akc. I i-;, lies The lar-r plant fr.vntlv startcl, ,s Mtuatc! at l),-a.l\voo,l Tnv slin,,.^ alUT pan,al .K-.vatn-ni,;. ,n ron,-l ..t i ,,n, rlafit\ m.i,' xals. whirh nMlu(v^ the proportion . .f watrr to s,,li,|. t,, tl„, n.tn, of thivr toonr, i.ronNvv.Mlm t uo p,pr-l,n> s i,, t hr ^l^nr-plant , as fol- lows: A l-.'-in, pip, rarri, s it froni ('Nanrlc \o, 1. a .listanr,- of ;{ ,' miks, at a niinmitnii -ra,lr ol P,',; ald-m. pip. ,arru-s ,t' from C'vani,!.. X,,. _-, a ,KTupu.,l l,v tlu- soluti.ni stora-r-xals an,i prmpua- t.on-pr>'Ss,s, tl,r n,-M !,v Ilir sl,m,-pu-sr ^ : an.l tlu- lowrst Lv the prrcipitation-x-ats an.l .lumps. Tw,. small vats arr pr.,vi.lr.l tor slakm- Imic. Their ...u- tcnts aiv .Irawn as n'.pmv.l t., a srr(-rn-.'. .vciv.i l,ox whnv the iindiss.,hv.l lumps aiv s, paratr.l. Tins l,,,x ..v,-rtl,,ws into an agita- tor. ln,m whi.h \hv nnlk-..f-l,mr ,s ...ni muouslv .lisrhar-c.l "mt,. the mam slnn, -stivan, at tli,'ratr.,f " 11, Hmc prr ton ,} slimf. The tw,; sIu.Iki- storaL;,'-vats arr 2(1 ft. ,l,am. an.l L'-l ft .Uvp with a 47" o.ni.al lK,tt.,m The .Its, haru.- fr.mi the- slu.i.ur-vats passes dircctlv t.i the Hiter-pivss.-s un.lcr a pri ssutv ..f al...ut 'M) 11,. thr.m-h a id-in. mam. win, h extrn.is thr.,ui;h the wh.,1.- len.^'th of the press-1 uil.lin.;. Betwen .aeh j.air ,,f ,,resses this'^iiain branches ,nt., a l.niKUu.Imal lO-m. .list nl.ui ,n,L; p,pe. whieh in turn sen.ls tw., 4-m. l.ranehes t., ea.h j.ress. These small branches eommum.;ate with a .■.-mmu.-us . hann.l m the press at the centre of the t.,1., 4 ,n. .iiam.. bv means .,f whuh the slime ,, asses to the hller-chambers. Othc-r channels an- ,.r.,v„le,l as follows : One at each upper crn, r, 2^ m. .liarn.. f,,r the .-ntnm.e an.l exit of air '"»' ■"■ 'a.h l.,v,cr crner, ,,f sam.. .lianicter, for entrance and exit ,,l soluti.,n: an.l .,ne lar-e .-ontinu.ius channel extenilinR al..n,- the c.-nliv .,f the b.,tl,,m, bv means ,,f which th,- s„ent sitme ,s slu.,v.l out. This channel is H m. .Iiam., an.l alon^ its .Sill /\A( i:\i ( )■. Willi-: i'i\.\( 'IKK t.i]i Is Mi^l'i'ii'lnl a .'i-in ]n\n- t xlnnlinL; llir Kii'^lli nl tin- press. 'I'liis I'lln- Is I>rn\ i.lfil with '.!_' nn//,lr>, liii l'iii<4 aiiil " ,_, lii'liatn. t-aili 'if wliu'li ilcliMT- a ..irraili iiitn mic «il" the l-in. clianilic-'s. utuliT a In ail n\ .li.Miu ."II lli, H\ a sji,.iial iiu-iliani-in , a miinM- c-.-i;in'4 in.iliDii i> mipai'lcl Im tin-- pi]"', raiisitv^' it tn rrvuhx' thrc)Ut;!i ati arc ni _'!(), mi that cat h siiiall ii'i//]i' jijax ^ a'^aiiist the C()ni|)ai-t -liilir rake. i-riti"\ iiv^ 1 !if cake r. iiiiplcicl\- atld clraiisiti".; till' r.itlll .aflnii III 111 aliiiul !•". Illliuiti' The iliscliai-;.;eil -.jiiiu' i'l.i; .'i.'. Merrill Z'lu- l)n.;t IVcciiMtati. .11 I'n- k-a\-es tile press thrnuL;h the I'reseeiit -shaped spaee let weeii the 4-in. I'ipe and the (i-m. ehannel. the latter lieiipu seakd ihiritiL; the operations eration, e\clusi\e ot tillin.L;' and einpt \in;.,', oecvipies alioul SIX hours At the tinie ot in\' msii ijanuarv , Mlll/t, h\e ot tlie LM f WW I HI-: i'i<.\i'ihi: \i nil: iii'Mi-.^i \Ki. :)i; pri'SM's Wire m o] iimi mii .ni'l wiirkiiiL; iiin^t --.it islai I 'inh . the iiiiKmimi,' I'fissi's wvvv parlh ^i I up ami wric 1 niii; put niln usi' a'- tasl as the plates affiNcil IVmiii tl;c la>tnf\ L'li'lrf ilatt- i>f l"i'liui'at\ 11. Mr .M( itill wfiu-, "\\\ air iiip\' tnaliiiL; al tlu- rate lit aliiiiit PJ.lillO t'.n-, prf iiiiuith ainl will inrrfa^c lliiv l.\ -M M'fal tlii)U--aii(l toils pcf tliuiitli unlil our full iapaiit\ oT "U.ddO tolls Is attamnl, I'ost .lata an- not oliIaiuaMr Mt, liili will tlot rXci I'll _'"i', prf loll tor all Itrllis," Ml- MiiTill sul'tiuls tlu' lollowiii'^ ilala for Iaiiuar\ . I!tl)7, Tolls tnatnl . . . T.CiTn Assa\-\aluf s (i s" Ki(.ii\i'r\' in iircrijiitati' (Mis Carrinl o\rriti uiijiriTipitatfil si>lution , () lUl Total ri'i.'o\cr\ iri|ui \ alcul to IMI jnf irll! i , . S (I 77 At tlu' present tinuM.Ma\- 1', cli'Vcii of these pre-^si s an- v.ork- iul; emit iiiuouslv. aiiil with results eoiitiniiiiv^ those ot the expi'fi- iiiental plant L;i\"in alio\e. 1 lia\ (' alreailv state'!''' w hat I ei meeix e to 1 le the limitations as Well as the nuuMts of Mr Merrill'.^ proeess. In all fairness it ina\' lie sail! that eaeli of the lilteriiiL; sX'steiiiS now m \i),L;ue jiossesses ilisiiiu't merits of its own. The supreme test of tln' iiU'tallur,L,'isl in these cla\'s of main' iineiUioils is to seleet the rii^'lit pri.eess for his purposes, that i-', ihe one unitint; the L,'reatest iiumher of aiKantaijt's w lu n applieii io his speeial proMem. Of Mr. Merrill's svste.n it nia\' lie said lmall\ and em]ihalii.'ally , iha! it is an estali- lislu'l sui'i't'ss, and will i.'onse<|Uentlv ha\"e a wide i'aii,!.,'e of use- fulness. As for the install.ation ilstdf. wliieh will eost . when com- pleted, a half-million dollars. I i|uestion whether in the whole tield of eyanidation. we shall find a more ini^'eiiious and oritjinal aeliK'\'ement . or one more eons]iieuousl\- uniliiiL; metalluri,'ie,'il t't'th ieni'\' with ]ierfe(tion of meehameal detail. 'Mnurit; .in.! Siitntil'ic Viv . Di-nni! .-r 1.'. I'lni; VACLLM SI.IMl' FILTICkS ' . ■■ II I ■■1117 Thr H,liiur : Sir In \ii'A "t tlir :irIuU'^ tluil li:i\c .■iii]ii'.irc(l fniiii liiiic \i> lllllr in the (I'lunm^ "I thr .Ml\I\i, avd Si i :-.\ti i ic 1'ki.^> as in till- mints (j| tin- .M< MiT aii'l lUitt.r-. s\ vtiins of ' aruuni-lillrrs, liaxiiii; li,nl suiiir crqu-nnii r witli Imtli, I wnuM like- tu ail tlic i^rnrral rxiliaii'^i' niiMun uf t he pulp in t lie tihci-lidX 1 linnit^'ii- uut the linifiif niakiirj I 1r rake anil l'\ maintainin;^' iinifurni khi- lilllnns until the end nf illsplaeelllent . w lu 11 tlu' (lelM)siteil sllliu- is I'eaih' tn lie i lisi.har;4ei 1 . H\" unifnrm edtiilitidiis. I iiii an a I'lmstaiU \aeuum. emistant h\ ilrostatie pi"es--'.ire, ami as little I xpnsure tn the air as jmsslhle Umier tlii'se tniiiiltiniis I tinii tliat the ilis]ilaet-nienl is alninst jierleet. nn ajijirt-eialile ileei\ase 111 siren,i,'tli of i\aniile 1 liiii,' iinlieeaMe until neariiiL; the finish of displaeinunt . whin the ileerease is rapid ilnwn tn the streni,'th nf the barren snlutmr with wliii h tin- washini,' is heiiiir dnne. which shows a displact .nt of the prei^'iiant snlulinn eontaim-d in tile i;ike, with \er\- littl' dilution. Dilutinii, wlun ilisplaeine '.villi water or barren solution, is to lie a\niili-d, as it means a lari^'er aninunt nf snlulinn in lie jiassed throuj;h the zme-lioxes. and. in tin- i \i nt nf water In ini,' tist'd. il also means a lar^'er quantits' ol waste solution. The methods of operation of both tlie Moon' and iUittiTS filters iia\e liein '^iNen at sniiie lrni,'th in \our i-olumns at \arious <'mC-, i--"; ; them aL'ain. I .1, .11 1, ,■;..(!,• ,>,,,1,n.. r 1( I 'I'M ^I.IMI: l-ll.'l l:k-- :? 1 :i In ImpiIi >\sirnis tlic stui-.ii^r, nr i'i|n.ili/m'^ \ ,il . i^ plaicl tu (inc •,\i\r m| ilif liltfr-lidx. iiul|) liiiiii; drawn linni il in kn p tin- l III ;lii' lillrr Nul>niiri;ril ihirniL; t lir li>;nialii>n mI ilu i akc In till MiiMic >'.-~tcni till- wliiilr ni ^1 ^t lla\l^ iwlnrli air at - taihcil In a IraiHi i> iiiikjm'I liMin llic liltci-lmx li\ a t ia\ iIiiil: crailf aii'l 'lilisrfiil mid a ilisplarinn-x at , wlinli i> minu diati 1\ alon^,'>iilr lIu t;Itir-\al, t!u- \aiuiiin hi'inL,' inaiiil ainnl diiiiii'^ tlir iiidxiu'^ III" the Icia'ln! iiisi iif leases tii tlu' ( 1 1 s] i]a( 111 '^ - x'at s. The niiit 1- i(]ni|i(]>ril nt' ilinc- lillci'iiii;-', at>. I w n Inr ijisplai mi,', all'] "tie m the icnii'r tut' lija'iuiL; When llu I raiie lias i-etnn.iil the lilteis iVmn the Icia'lni'^'- \at and .le|inNite'l t helll m I h.e . lis] ■laeUl',; - \ at . it is dlsei mnei tc il and taken t'> the cthei' nest nl' (liters, wdjieh are m the ntjier dis- plai m^-x at . anil when the sliine-eake on I he lilters is diseharL;ed tlu'V are hn)Ui;hl dwv mtn the JMaditi'^' \ at . and the ni.ikiiiL; ot the cake eotnnunees witlmut luss (it tune. In the Hutters s\ stein the niters are statiniiar\- m the tilter- \-at . and. when the i :dxe is made the lilll|i is pumped haek mtu tlie sii ira'4e-\-al , the \ at is washed niil with solution and is then nllt'il With Water and dlspiaeernenl commeiues. Wdien tmished. the eake is disehari^ed, the snrjihis water is runliaek tn st(irai.;e. and till- disiharijed slitlle is sluieed to waste. The \ at is ai,'am shlleed nut torellKAe an\' Ji.irtules i it till' diseharijed eake ad- herinL,'tii the sides, and a'^am pum]ied lull ol slime t'nr the nt xt e\ ele nt nperaticMls. A eomiiarisnn ol the time intisumed Inr a iiim]ilete e\cle is as tolhiws : McioKK SVSTKM .\ 1 LtlMlHrV l'.|.M. Mll.l,. T K 1. 1. 1 K I U i: , C'dl.i)., j.\M .\KV, I'.HK). Makmt,' eake TraiisterriiiL,' tfnm Inadmu; tw disjilai m;4-\'at Displacing; or washmj,' cake ani].flin;,' I)ischari,'in;4 Transterrin.L,' from displacin;,' to loadin},'-vat. Hr Mm 4.- 1 5 15 5 Total time jicr cycle 2 i; A7-( /• \ / (VI \ //»/•: I'K \< I h /•; H'. TTKKS SVSTKM AT t'lM a | V \ | | , ,\ Mn.l,, CiOLDFI ELI), .\ I \ MaUi II . I'M 17 Fillinj; tiltrr-liux t'n»m stura^;f M;ikitiii caki' I'lmipiii),' |iiil|) from filtiT-vat hack to stora.v-i'. Filling; tilter-vat with wasti' suluiiun ur wanr. Dispkuinj; or wasliinj; laki-.. Sanijiliii),' Disc-liafKinj;. . . Runninj,' suriilus uash Miiiiium to stnra),'t'. . Shitiinj,' out diM liarj^ji'tl slinif ri'siiluf •2r, '1'2 II 15 n s 'I'lital time per v\v]v . ;{ 1 1 In i-oini.ann^^ llii- al.'Ar "iM,., fur tiiii- <(,iisutiK.l li\- tlif various sti'jis in cai'li s\-,imii, nil \.r ii,)ii,-,.,l tlmi \\xc transf»r fnjm till' loailinK-vat to llir di.splaiin),'-\ at m ilc Mmmr' -Nsicni occiiiiifs five niinuti-i. Durini; this short prnml ui iin;i' tl-.c \a- (iiiiiii In tiilh iiKiinlaiiu .1 . llnTcton.'. iIktc is no chanyi' in this partuular part of tiu' operation, the fxposiire to thi' atniM.plK r, is shor' an'l the rhan^'c from xhv hydrostatic jirfssurc of tlie pulp on ihf .,nl,^h(■.l rake lo that oi iju' water on tlie same in tlie (hs- pl.ii iiiv- \ al !■> r.ipi'l. In ihe I'.uli.r-, •>;> -trill tlir t '-.ni-l', r uf ihr ninaiiiin- jmip hark to storat;e after the i.ike )> iii.elc m, . upir-, L'L.' iiunutes: the pnnipiiv^' of the water I'or ili-pla.m- lafter all the \i\\\\< i- ..uti oeciipirs L>u minutes, makiiii; a imal .if !_' minutes from the tin- is|iin;4 1,1 the e.-ike hetore 1 ll-] ilaielllellt eail hr i c iimiu lire 1 Tins IniiL; periiHl ne.e-~-.it ates tile \-aeuuni Iieiil'.^ .In.ppe.l tlMili _'l t.i .", inille>. The .lilli reilre ill t.ital lilll.' e. )ii-.nni' .1 prr e\.'le, ..llief than in lllakllT^ the cake ail.i .lispl.i.ue^ it. i- srell to he 1511 imnntes with the .^^..,n■ -vsiriii. aii.l I hr, II nun, with th,' iViiirr-. the saving. Ill f,i\-..r . .f ih.^ .\I.,.ii-e -•, -t.,'in heiiii; I iir, I I inin. per evi-je, Init tlir -,i\inL; ..f liin.' 1-. ti.it llu' <.iil\ ei.n-i.ler.itinn Tile leiiL;tli .if tune (le.-npiiMl Prtwi'di tiiii^hiii;; the iii.-ikiiT^' of file i-akv ,111.1 ill,' I .iiiinim.viiieiil .if .Jisplaem'^- it 111 \hv iiut- ters svstein iicee-^ilate- .Ir.ippiii'.^ the \aeiuim .1.j\mi tn ti\c inehes. i i. >n in s»-\in niinuti's. I Wlirn tlir vai'iuiiii is |m\\,i('!. aWw tiiii>!im;^ tln' ■,iki-, tiiiuii of tlv moist I'Xti'Hur ]"iit \nn i ii i In < aki dnjps off w In ti tin- liNilro- statii' ])rfssiiri' is rfinoviil u Iniii'.; a ilitVunlt iiiattcr lo aHjusi till- vai'uuni at tlic best y'lwn In- air partutikir lakr. Inr it li!o hijjh. tlio rake will \»- l>a'll\ rr,a knl , all'l it tun low, ihr rake has a tfnilftu\' to sloui,'li ui'i In the )'_' mill. I iiiistitiuil m |aiiii|iiii'^ ilir ptilp Imi k t'l storaKi' aiiil i'h- wall r iiitn ilif lilh r-liux Nir '1k|.Ih cin in , t lu' fXtrutr.c top ol till' takf IS (.xposid tor tin.' tull ;irrii)ii ot tmii- to tlic atir.os- ])hiTi.' and tlir low wuuuni that is niaintainid. tlii' Yu\]> rctciks slowlv down thi' rakr dnriii',; llic |ruiii|ini^' oul "! 'lii> jiiil]'. ami thf t'akf is slowly siiliiiiirjifd diinn^i tlu- i niiaiiri .it thr water, TluTcfori'. thiTf is a period of time laliotit Jii mm m whieh the cxtivnii' upper llalt' of the ( ake I-- exposed to l!le air lunger than the lower hall, and w th suriieii-tit \aeunin to hold llu- eake on the tilter-lcaf thei'e i> aKo siifheient to eau--r di-.plan mmt a> the Water slowh n>e> with the refill that iIm- preu;nant -^olulioii in the lower halt ^f ihe rake is tllori iir^lllx ilisplared loiv^ hi'Iore that in the nppi r half and a laVL;e amoiinl of dihuion on ur-, as the larL;e (|nanlit\' ol weak harnii s. ihiiiMii luei ssar\ |i>r displaee- iiuiu .i;oes to ]iro\"e, at the ('om'iinanon plant ii heiiv^' tour and onedialf times llu- amouiil > -i n\'n-.\ ire iMiuamid m tin' eake before displacement It will 1)1' seen thai m 1 lie time selledllle ( jI ! I'.e e\a le of opera- tions ihe Hmiers sNsiein will ha\e to lie eonsideralip- ehatv^ed lo all' iw ' if I he liesi workiiii; I I iiidil lolls. And I > on-ider it jireferalil-.' to tise one \al lor loadm;.,' and a separate \at jnr dis]ilaem'^. as then the small loss ot nme nee''ssar\- for washini; oui the tilter- 1h)x when idiani.;inj,' from pulp lo water and the rexerse are a\oided. and it also a\dids the eon slant small h isses that .iie liouml to .leeur 1a- this methoil throiiLjh mixim; of small amoimls of pulp and prej,'nanl solution willi waste solution wlu'ii tliev l;o throu,i,di the same s\ stem ot pumps and pqniii,', and the richer the solution the '^'I'ealer the loss. The wide il'''''erence in the ea])aeit\' of the two plants makes it dil'ficult to ■ ■ a just comparison of tlii' i.ost of opcalioiis. the Lilert\' Meii jilaill at Tellunde liaxiii'^ a ca|>acit\' of -J.'O tons j'cr 'ia\ ai'i'i tin v. wIT'iIm nation .Mirn. .^ piatii at « j<.j'i;ji(^ i,j i'.i.> icins ]n.r clay as at ]iresetit equippt il. 310 /v7-:(7-;.V7- (Tiw/v-. ri<.\i 'I'll /•:. The l:ih(.r rinpl.)\, ,1 al ihc Lilrrlv H< 11 at tlu' tnr.v o that with the small mm as insialle th.e toji nf the mill, a lift of about .M) ft., recjuirini; about 7 li.p. e.in.stantly . the total power consumption 1 eini,' "M hji. to ehar.i,'e at,'ain-I the filtu- eciuipnunt. The power eonsumption at ti (_'■ m! ination plant when operatin.u' two Butters pumjis. whieli the neent new- addition iii.ikes neeessar\- (the i.laiit beiu'.,' two units . i- L'd iiorse- piiWi-r. The ('iiniliinatioii plant then, with its iwu -.mils. ..r.r ..i _'s leaves and the oth.r of M) leaves, ean handle \, t,.rs , ,f dry slime per day win n working' at a maxnmim .ap,ieii\. wuh lal or of one tnan per shift and a eonsumption ,.i I'o h.p The Liltrtv Ik-U plant, with its four sets of leaves eoiisistim: oi (17 ea>h. will handle -i.'.O tons per day when working; at maximum eajiaeity, with the labor of t.vonun per shift am! the < onsumjition of T.W h.]>. Therefore, as far a- direct (Dmp.iriM.n ..f the actual ojjcr- atiiiL' costs of the two jilants j,roes, there is not niueh ditferenee. Hut two important items that efTeet the capadtv of the Moore I'laiH at the I.il.er;\- H,ll, .md that so far ha\,' not 1 ( rn lakiii into consideration, are the stuk\ n.iture 'if the ore handled and a ilitTereaee of . ■}.(!( )() ft . i,'reater altitude In takinj; u[) the 'iiustion of maintenance it will !e noticed that the total miiiilier of leaves in tl;r Libertv [?( 11 pl.mt i- _'tis a;,'ainst ."X Ka\r> m tin- Combinaiioe jilani. heiice. ailowmi,' for an equal life m each ease, the renewal c(ist for this it, in .,.,,,;.,,,,.,! still holduiL; ^;oo(i. that a ,L;i\tn pulp am! vacuum ..mditiMii will ]' i( rr.M .^^iJMi: i-ii.i i-.KS. :!i: ]iriiilnrf tile >,imc cake tll cIlllcT -v>lrlll. the Mih.it phnu at t!ir I,i!Ki't\ liill it woi-kiiiL; '111 I'liinliiiialiMn urc wuuM li;i\r a lajiai-ily (i| Ml." I.lIl■^ |icr i!a\- a;_,'aiiist l',l.'iton> pd' i!a\' ■ )l' tin- |Ji-(>tiu ('nml'inalum |ilam. In I lir iiinxni:^ part-- i it tin i rar.r in t ho Mniii'f sv.strin, tin- main ili'iu lor r\|n'ns(v \>>v r(pair> i> I lie n new al lit the littiii',; laMi'--. wliu'li rc(niin' rriu'wnij,' almut uiirr a \rar it pr' i]i(ii\ ailju^ti'ii wlun put I'li. The npairs tliat arc nt( t >si- talnl 1a- the ii'am'> aiT iit't'sct li\' the i\ pairs t'l tlir rent ritui,'al pumjis ill tlu' lUiitirs s\strni. With tin- .Mnciix' systiiii. wlun' lH'a\\' Idads of slime aft- niovi'l fri mi wiir \ at to aiiotluT, tlnTi' is ahvavs tlu' ])()ssil>ilit \ ot aniiKnts. tni nisiaiur, a ralilu lii'i^akiipi; and caustni,' a liail wrnk. fuiiiiini; up tin- ft pair liills rai)iiil\'. hut with iiVi.prrh' ilc^iu'in'il apparatus the prohal'iliI\' of such an iHTurrfiicf is \(r\" rcnioir. It Is sujiposfil that tJK' iiio\in),' of the filters j^'reatly k'sst ns their life li\ strainitiL; the eanx'as: sueh is not the ease, as one cannot feid the least jar when the erane start- to lift, ilu' \i'rtieal xeloeitv I't'ini; oiilv se\iii to ei'^lit feet yvr minute while lioistin,i,' the loailril l.askets and the same when lowerini: into the dis]ilae- ins,'-\'at. and iliere is apparenil\' no more dilYefi me in th.e eake or tilters ,iftei' mo\ini; than it tiuv !iad not hee'ii reiiioei d troni the loadiilLj-N'at 'Idle su-peiidi d load on eaeh filter-leaf i- the same 111 either easi-. whetlu'r tile fdti.-r with its l.iad of shtiie is renioN'cii from tlii' \'at full of pulp, or the pulp remowd fron, aroinid tin- filter, the oiih" dltTereliee l.ritlL; in the length of time till- filter is re(|uired to sustain the load of slinie. unaidid li\" h\"dro- statie pressure of eitlu'f jiulp or water, whiel; maxinuim leiiLjth of time is seen to lie fi\a' llUnuIi'S in tlie .Moore s\sttni t.. )' ill the Hulters. In a 1' m|iarison of eosls of installation, a .".s-Irat plant s\u ,i as is used in the t'omliinat ion null will he taken and the mam items of neeessarx" material fi'r e.aeli one tahulated. HI 1 m:ks -\ SI l-M. MdliKh S^ SIK.M. ■_' 1 li\' III 11 tilUT-l.ipMs :l 11 1'\ tuft tilterdiiixes I ilh\- IJ tt puli> stciraije-vai. I lllv. I -' fl imlji st(irat;e-\al 1 \\ \<\ \1 fl waliT '■ 1 1 J l'\ III in \:u-inini luiinii I I J li\ 111 111 \ :uiinin-]Hiin|' 1 Hl-li i' im.I.'r ■J lin Butlers ei-ntnfu^al imiiips I .'ll-ton ' r.iiu- .iirapp. d witli I ■_'ll li (1 nidtor. 1 lii-h p !n":ni .'iS Hlter-k-aves. I I ui i . nt ntu^al imniii. .iS mter-lraves. :5ls /h. I'R,\( •//( H II will l,f srcn that thr Mmuiv ^vstcin iv.|uuvs ihiT,' ulior- 1">\r- ,1-ainst nnl\- tw, iicVir.l m th, Hutur-., niil\- Miir si..i-a,^i- \-al liriii- iirr.lc.l, aii.l thai \>>y pulp iii tlir lirsi iiiMamv, a.> a-auist tw., in tho srron.l ; an.l a _>()h p. t,i..l.M- avaiust t \vn lO-h.p. The main .liltrfriirr m t l;r ri.mpnM- an ,-<|nal (iltcfin-;-aiTa m rach caM'. Tlic Muuiv ^vsl,.n^ u,j| l,a,„li,. SI .■hai-rs ,n 12 huur-,. an.i tlir liutt.'fs syslt'n) 1(1 ihavL,'"-^ m 1 _' iir 1) minute-:. T" -unmiavizc : Tiic up,M-atiti- ,,,,,s ,,f luhi-r s\strni aiv ali'.ul r(|ual, as aiT al><. tln' inaintrnanri' an.l fcpairs. Tlu' installation v:<>\ tur i hr Mouit >v.-strni i-, ;<"' , i^rcat^T than tlu' HulHTs ssstoni i,,v an r.iual tilt.nn-~ar.a. TIk' i-ap;a-ity is .'il' , -nati r in t ln' .M,„,rc system than in thf IkittcTs systriii f.n- an npial tiltmn-af. ;i. The c'ltiiicnoy nt the Alncrc sv>t,tii tnr the fn(i\('r\- nt' j.rru- nant ^,,hui..n with thr least ani..unt uf 1,,,-, an,! .liiutinn. is hi-luT than th.c Huttrfs s\siein tnr iTaMJtis prcxioush, '^ui n. TltetV IS IK, .lnul,t l,ut that -nen uleal 1. .pu-raphieal enn- ame amj.le stnraLje 1 elnw itn a-aiii allnw for the stnra-e nf pulji ail^l wal> r:, a .irivat sa\in- of time is nlaamahle he allnv.in," the pulp an,l water tn flow m an.l nut ni' tln' tilter-lmx rapi.llv This wnuhl nfeessaril\- -reatlv" ineivase th<' enst nt installati.iti Un.ier such enn.littniis the- amnuni nf pulp and water in he mnMMl l.aek up hill alter eaeh ex'ele nf nperatlnlls wnnhl he pertnrnieW n\er a Inil'^' Iierm.l nf mm- an.l imi ,,!,.iruet the hltenm; ,,perat,,,„, mstea.l "' '' '-'""■' l"'''i"'l 'lunii,;^' whieh liltennu; nperatiniis must eeasi'. as at tile Cnmliinalinii plant. IVdt even iin.ler tlu.se enii.lit i. ,ns. whieh ha\-(> niateriallv les-eiie.l the time ennsunie.l an.l als.. impr..ve.l the enmlitmns Inr .hsplae.'tnenl l.\- rem..\int,' the pulp frnm ar.,un.l the filters t-api.ilv an.l -ettinL; t hem .|uiek!N suhmefeeij in the ,lisi,laeini,' me. hum. we liave n.,t eliminate. 1 ilie n|,v-i.,us npp.,rtumties for loss, that is, 1,\ alt.'niatel\ runmii- i.re.,'nant s.,luti.in ,m.l water Ihroiii;:-, ti.L .-^line |. ..mips an. i pipes an. i into i he same reeejitaeles. \'.\( riM ^I.IMI: l-ll.l l-.KS. as a larj,'(.- jHTrrntaiji' nf \\\v \vatiT thai in this wa\" 1 i coincs itiixnl with the small [iriuuiits of ['iilji and |ii-rL;nanl smIuII'MI has tu he alln\wil til lam I'l wastr with the ■lischat',L,'fil wikt- "f >hirL". TIn-'frfuiT, the less ( i| ipi irt uiiH \ thriT is inv anv stuh nnxm.;,', \\h(.'tlicr acii'Kiital ni- miaxoiclalilc, thr Irlttf. llnuT iiM' fi'asnn lur sa\ini; that a loailin^-wit in viiich tl." cake is niaWt- ^hmiM \v used tnr ihal ]iur]"'--r alnnc. Ami the sanir iraMimirj holds j,'■ lU'll null at Trlluridr Jias i,'i\-fn usa further artielr on the Moore tiltt-rs 111 ust' there, sli.i,'lil 1\' ehan.Ljin.^ the ti.L;ures as slu)\vii in the taMe 1 ha\"e L;i\in tor tim.i' lonsuiiKd ]ier e\e!e, wliii h i-'han^e no douht eoiiie,^ from cj\a'r a \a'ar's further ex]ierienee witli the plant. I am hiopin.L; tliat hi- wi'l furnisi; us witli voir.e \-al- ualile lii^ures from reeeiit operations there, and that Mr. Mark R, Lainli w !1 do t he same wit h refereni'e to the more n-eeiit install- ations of the Gutters s\-steni in Mexieo, for the heliefit of tile reack'rs of the Min:\(1 axu Sc i kxti l-ic Pki-:ss. A, (i KiRnv. (ioldfieid. Xe\ada, June I.". CnWEWXi] TAllJXC, TllR()L"(ilI I'll']-: (July Jii HMI7 The Kdit.M- : Sir In npl\' tu \i.ur iT(|urNt tnr tui-tlici- ihita ronccTnini,' the ].ii)r-hnc for c()n\r\ ini; tailing,', imntioncl m \(,ur arluli- ai.pcann.t,' in the issue of Juiir •_'!». ! 1,,- to ,a\ thai ihis hue is ."..4-1(1 ft. lonir. of ,S-in, casi-inm li, II ami spi-ot p'.pr. ;-\n. ihiik. ami j.iints ralkcl with iiriiip rope |mmm.|\- (ln\-( n iiUo phi, e after havinj; been tarred, it i-, laid for Us first ,s(M) ft ,,ii a '^ra.le of ;}J',. alter whieh it has a uniform u;radt i lirou,i,'hout ol 2\' , . Tiie pijjedme was most earefulh aspliallcl on the speeilieal ions for as]i]i,dlin.i,' pipe eontaim'd in t!ie proeeedin;,'s of the Amer- lean Institute of .Minini,' Hni,ineers t«o \rars ai;o. .md was made hv tlie Anieruan Cast Imn I'lp,- \- l'onndr\- ('n_ at Anmston. Alahaina. no speeial jiriee hein.t,' paid for said asphaltmir. whieh is jiart of their rei,'uhir praetiee, appannth'. The hue of ]iii,e ji.asses llirou'^'h a erowdeii eit\- and has m Its eoiistruetion maiiv eurves. tlu' ma)orit\- of whu'h are on a M-tt. radius, the eur\es heini,' made h\- shoin sietions of eurx'ed pipe in .'v!t. and (hft. leii-llis. ordered for that jiurpose. At tile h.ead ot this liiu' are two de-waterin- -ones ,,f 20 ft. diam. wil h, 1-. sides; these renio\-,' ahout oiiedialf of liic water from an oi.yiu to one pul]. Ictore mtrodueiion into tin- pump. The pipe was put into servir- at thf middle of .Mareh UtOI), and has iner. in eontinuous usr up to thr present date, haN'in.i.; earned appro\imatel\- KMI.dlll) tons of drv pulp dunni; thai titiie. Caret'ul measurem.nl s ot the interior diameter of the pijie, made at the e.xjiiration of 1 :! months of serxiee. show that it has unler-onc no appreei.ihle war. The total cust of mainteiianee and ujid^ee|) dunii- the 1 :{ months has l;een ;5,."7 prsos. spent f(;r jiHinl on one ot the \iadu.t towers. There has heeii ahsolutely no other Ml m of rxjien.se sinee its installation. The ]iulp is that resulting,' from erushin>4 throu,<,'h a mill of ,s() stamjis with a sitel wire screen of L'(> mesh, with 2S wire followed by tuhe-imllinL; of a jiortion of the eoar.se j)ro(luet sueh that td'ter ''"""'■■■''■ ' ' I "■ — :e ; :-a;p a:. :.;;;;;;,.._" , ottiK iiai.im v i;oiiiuiaii\ passrs a iL'U-mesh ser( en At times, however, wlien the lube-mill U).\\l:\'l\(, I Ml.lXl. I IIKOl'l.ll I'll'l: .Vl\ has liccn nut i if siTviic I'l ir njilaicnirnt >>{ litinitis, nr Iuint nin two wt'fks at ,1 tiiiu- en --traiL,'!!! I'timi sli ha' t< r\ -luilp. ( )ii t\M> or tliRT ci rasi'ins. \>\- rrasnti nf nc;^li i I nn ilic ]ian hxilrnst at ie In ad al.nx'e tile jmint of nistruetion sultieieiu tn fnri e tile saiiil tliriiui,'h. l)(la\s fmiii this ,-ouree ha'.e nut eausetl ninie than fniir lii>ur>' In-s ^li time in th.o entire i:i months, ainl e\ en I hell 1 lie\' Were ilue tn eare'essiK'ss at the cones, as iiienliniieil alin\e, \iirniall\-. nmntli -ifler nmiith. tliere wa.s nnt the .-li-htest tuiilellex- nf liie pulp tn iKpoMt .in\" saml what- eW'i" in the line ami when, ilue tn I'leeti'ie >hut-ilnwns nr an\" oth.er stnjipaije at tlie mill, pulji eeases to llow iiiln ll;e In ad nl tile pilie, the line keejis itself eiitireh- elear witlmut the inlmduetinii nl water. At the present eapaeite nf L'.".(i tniis per da}' the pulp I'uns onh' I,' in. deep mi the lioltmiiof the ,s-in \-\]r. niiiiim;,;' at sueli spec'd that the disiaili,- hetweeil the elliN of tiie line is tra\-etM.d in alinut r_' minutes. The addnimial Ml >taniiis to li" started in Se] tenilier will doulik- the amount of ]iiilp'. liut the J'ipe lan carr\' !.(MI() tons as easil\' as the present L'e.d. The wear i> so sli;.,dit as to he in\isil.!. u]> to date, hut m aii\' c-ase. the jmlp runnin,!,' onl\- m tlie lower part ot tlie pipe wnuld allow of the turnin.L; of tin entire hue ti\x' times hetm'e it was entire!',- wnm nut. and we fi'^uri' that if the line were tn fu'eonie worn out c'\er\' .wo Nears it would onh' mean two cents per ton carrit'd. The present apjicarancc is that it will last 50 years. C \V V.w l..\w. (.iuanajuato. Jvily 2. C\.\.\II).\TI()\- I\ THH TRAXSVAAL ■ Ju:> jii iitiiTi T'lK- 1-Mi!"r ; Sir I must lakr cxifption to vour Joh.innc^burK lurrc- >l..)iicient's remarks in v.mr is^ur of June N. Fossil. Iv he dois not understand the matter he eritieizes. otherwise it is alto^vlher (httieulT to understand uhv he should so stron,i,'lv depreciate the vork nt tile I), nii\- hrothers heeause the local juMjple are appar- entlv unaMe to estimate accuratelv the assa' value of tl,,-ir ore That the, ■■new metallur^v" eunsisted nierelv of a tiielhod of assavini: is news to nu- What the Messrs Dennv anmein^ed was that : (at The i>ld iiKilio,! I,;' trea'in.t; coarse sand Ia a Ioiil; per- colation was wn.n^' in theorv and in practice and that m spile of opjiosiiion the mines would ahaiidMii it in favcr nf tine Ljniuling, for v.hiih ])urp.i>e tliev introii All their pnini. the Messrs. |)riin\- appear to liaxc pro\-e(l to the hilt. Indeed, the Use i.f luhe-mills. startiiii; Inmi the one im])oneprcad all o\ , r the Rand: and I note no fault whatcNcr is tnund with the extraction dhtaiiicdi liv the ■'new nietallur>,'v." and that in the same speech Mr. Alhu apijarentl\ statis his satisfaction with the work of the (ilter- Jiresses. Ills uiu cause of dissat isfaci inn sreiils to he his dil'licult\' in olitainin;^ reliaMc preliininar\- as.,a\-s . hut this surelc sluaiid not he insuperahle. and is an cntircK- sulmrdinalt matter to the olitainiii;: of ihv iuji l""l"" Ml at 1 1 le 1 1 11 iiiiiiuni cost ( \ .1A//'.1 //"A /A ////■, / A'.IA ^r. !.!/,. 1 write tills tnH-.iusc tlir iTiruiik-- ul \iiin- .. irrrN].. in.K n; .,w caliulali-il |M ii>ii\c\- ii wrwiv-; mi|'i'i-->ii m . .iinl imt 1 i'r;iusr I aili filtirflv 111 arrufil willi the liiU' 1,'ikrn l'\ the I)rtiii\-- Ti.i\ wrfo r:m;i(iUs Hi tl'.iif pfrlmiitiai'N" wmk ■■ti tulfitiilN . tl;i;r \tfiliit \va- aiiiplv- m-tilinl l.\- rcMills. Tlirv ■lul a -'"h1 'leal "{ pfi-lim- inar\' wifk with liltii--]iiTsscs : thefc. tuM. thiif iK'ri^iuii stUlis jiistifii',1 li\- fc-iiltv, Wlit'tlirf tin ',■ ■lis]ila\-fil '',• saiiic lautimi 111 liuiliiin'4 tWM new [ilaiits :h\ mliii'^ "ii snluii" ■! ilir '^'iM I'V wiiat \\r tn,i\" trnn 'niwnar-li'ix (uiitait' W'lulil Ik iiuirli irniv ilcliataMc --uliii r! c'Xirpi t"V tlir t'aii thai it ap|.rai-s tluA prn- \l,lr.l aiMltiniial |ilant t'lf tile puriinsi-. l,ut tlir use nt wllH'h \\a> iiiit I'mUiuI 111 praitiic t'lln' :uHT--,,ai-\- , aiv ! 1 lia\c 1 rrii aik/iTil nut I'lMill aii\' SI nine o ■mifrtril witli the Mfssr-,, Driiiu tl'.at Ml'. All'U has stiMii'^lN- iil'irctril t' the use of some speeial a!lo\- tor amal'^aniatiiiL,' ]ilates now that the need of speeial eltort m this dire<'tion is kntiwn . hut i eannot lielie\-e that a iiuth.o.l of ixtraetm;.,' all the ,<;old in the slime at praetieallx- no i'X]iense tor plant las far as the s.ilution of ,l,'o1i1 is eoneerned i will 1 ■( li'.,dulv ahaildoned l.v the industrx' il do not refer iieix- to South Afri- ean praet iee onh" niefeh' heeause of a fault \- or iiietti eli\e m.etliod of ohtainin'.,' imdiminarv assa\ -\-alues. '["he saxiii'.^ in I'osi ot e(juipment alone is a faetor eoinpellint; most serious attention, 111 eonelusioii. I am not prepared to admit tlial the .Mi'ssrs. Deiim- ha\-e \et made iii;ide out their ease in faxor ot all-sliminL;. If the words 'liiu-r i,'niidiii,L;' are sulislituted tor "ali-siinnnL; there would lie !,'eneral airrei'mi'iu with them, liut personall\" I am of ojiinion that it is still the most salisfaetory and i_.eon()m!e;i! nielh'"' in 'Jem r.al iir.ietiee wit li exeelit ions topi.T- oolati- in \ats, without expense for power or handling, all th.e sand suitalile for pereolation iii \a.ts. t'he ivmainint,' pulp reccivue.,' the .S_'4 Ki-A /•. \ / f V \ \ini: /'A'.w / /( /•: suital.K' trc;itiiii II! i|..,s-.ar\. Apart In.iii tic l,.ss cost ')f thus cri'iitin.!,' tin- Imr s.ni^l. ur have as vr[ iir, rclialilc data tu |if.i\c that the ixt fart Kill (jlitaiiii'd liniii thr shiiicd satui, as sand, apart lri>iii sliuu-.l lonivntfatr ,,r -hiiir. i- so much hf^'hrf as t.. instil\- thr extra (.-list (]t' sliiiiniL; atid n\ hatidhif^ the shiiic. Thm- tiia\ Ik' ores in wliirli luta! -htiim- i. i.frlrrahlr, hut uh.Tr thr --.Id is carried in the emu ,'nt rate ci- in euntart witii s,,nie s.dtef ny mure tra,<,'il>' material it i> >urel\- eheaper t.. treat the (me partielc- ,,f sand without >ul.ieetin,L; thetii tc, the partialis uiiic env etvd ex- jieiisr III further 1,'rmdini,'. A\(lTlll.k I'nKKl, .,i.,i\l)|,\ |-. l-iinduii, [line i.'li. (.VAXIDATIoX l.\ Till': TKAXSXAAL Sir \Vr have rcail in \'>ur is-^uc nl |nnr S soinc --tali nur.ts niaili' !i\' \iiur |i ilianiii slptir<4 r(irri-|i;h votir imii'nal slauinmls wliuli arr laliulaltil In 'In us sonii' lianii tliat \ nu \\ill L;rani n-^ tlir u^i nt vmir I'llumn^ to ivlialiilitatc mirsi'hi-s in the cms .if vmir irailrr.-. \'nur ( I irrosjiiinilrni lici^nis l.\ sialmi: 'liat "scxcral d the mines unilor onr cumrn! spi-nt t hnus'iniK ..i punii'ls \n install the pnnvss (it eirrvilatitiL; i\aniil. sDlutinns ail\ mati'l hv the iK'tmy l)r<)tlH'rs," at i ImIIiiws thi> with a i|ni)tati'in trnm the a'hlrrss of the t'liairtnan nf the \e\\" (eieh Cn mn whieli mine we nistalli'l one lit Miir [ilants:. ami an ' iliser\ atn.n ut his nwii that the Chair- man's .stateiiienl reteri'eii t'l "is rather ilisenm erl iii'^ to the 'new mctallnri^'v.' Hi'fori' iiroceeilitiL,' t'l Ileal with the ("haii'inan's rentarks on tlie sulijeet uf our prnecss. wr wmiM like tu pnint nut that nut a sini;U' imiinil was spent li\' iis in the mstallatii in nl the prneess for I'irenlatiiiL; e\aniile s, ,]ut iiitis. We purpiisel\ liiiilt mir plants so that in the e\ent nf mir wishii^i^' tn t r\ the et'lei t uf eiretilaliiv^ siilutii Ills the\- wefi' as reailil\- ailapteil tur that as fi ir i mi" i irilinary tft'ainii'nt withnut en'eiilatiiiL; c winiile sulutinn. whieli we hail installeil at the \'an \i\ u tnitie, ami whuh. we tna\- aiM. is the system tu \\hieh it is prii|)h ri< \i i u /•: Coniiti),' now to tlu' distiint k;itinv o| our systftn. wliirh luis Ikiii jironouiui'il hy tlii' (.'iKiiriiiati of tlu' XfW (ioih to have ^iviTi rise to (liiluultic's. \vc would oImtvc that thi' tt-st of tlie frticicmy of a jihint is his,'h extraction oiuijlcd with low working i-ost. Xiithtr of thcsi' ilaiins are <|U(.stioni(l Ii\- thi' t'lunrtnan. who eloarlv states that it is the inieiition to aliatnion the I'ireu- latinv I \ anide Solution method. merel\- hi'eause of the unreliable natuH' n\ the sifeen-assavs. wiiieh hail i,'i\en rise to erroneous rstlllKIIes of the ,i,'old to lie exiieiii'd ;it the ninlllhlv elean-Up. Advertinj,' first to the I'lTnuiuv i>i ilie ])laiit. we iiiav saw without any fear of eoniradn Uon. ■ tlic residui' from the ]ilanl will not a\eraL;e more than from I'.iur to six Ltf.iiiis. when ill the form, r plant tlir aM raL;e was from is to_>| w]-, Tliis result . aii- Ilol l.r s;iid to lie lltlsat Isf ael or\- . i'lie ass, I'tinn 1,1 the Chairman that the sereeii-assavs have proxcd utinliahle is one wc .\in neil lit-r idiitradn t nor c'ontirm. in ..ur roinplrle ].a])er. read lieforc tlir Soutli Afrnati Ass.K-itition oi l-lm^uieers, m Jniir, HioCi, wv admiiird I he dutimliies inher. nt in the prailue oi s. mn- -amphn;^, wlu^n liir s'linplc Uself is sul.- jeited to the sohellt ctTriis of Weak e\amdc solution: liUt We alsii |ioinird out \er\ rmphaticall\' that the oi-dinarv sN'steill ot s, reei!-s-,niplm,L;. and espreiallx the usual metlio.l ,-mplo\-i'd on thr Rand, w^re opt n to e\,ii L,'ra\Tr rliari^'cs of conlaminalioii, which I harms \\,rc ii,,i i-rPuncd m tj;,. iiismn'^; disi iis^i, ,11, As a matter ot !aet . wr miijlil mention that the sirecil-assa\- a! the Xew Cioi !i during; se\eral \cars of our experieiiic was as unrehaMr as 11 eouM possil,l\- 1,,^ and wr allrihuted it then. and i)o\\-, to ihc faet that the ore of the mine e Jiitaiiis unusualh' eoaiM' partu-les of frer L;ild. and therefore we do not heheve that the ahandonnunl of the eireul.-il m.i; solution wUl ,,\-,-rromc the dilficuli\-. whiie We are rertam that tlir workin,^,' .-osts will l^ hiudier and the exlraelions louciv We make the last statement <|uite advis,-dl\-. Pce.-mse we ran the |.laiit al the Mevi^r \- t'harl- ton mine la j.laiit tlir I'Xaet eoimterpart of tlie \'e\v Cnn li j.lanti. first without e\anide solution, and wirt-fuil\ iioteil ihe restihs, and sul;se(|ueiit]\- with exauiile s(;lution in eireulation. thus L^ettiiiL; tut'ial workitiL,' ti'.^'ures for comparison. The important ditfer- eiiees are ,i;i\-en m our paiier prrx'iouslv referre(l to \\ luit IS the more inexjilu .d)le iiart of this ehan,t;e-o\-er on the Xew (io.ii mine, is tluil with :m exactly similar phmt at the I )\\iii \ I n>\ i\ I III' IK \ \'-\- 1 I/. .{•j: Mi\ir iV I'lKirllun, txtraonlmai \ >iu . > >-. li.i> inii .U l.iiiuil , wliiih is attested hy tlic fact that tin- Tiiana;,'ir of tlu' niinr. wlun showing tlu- muiiilicrs uf a siit-ntifii' soiioty umt tlic iilaiii at the i'no that ilie new plant, accnrdint' to the offii-ial stateiiu'ni nl the in.itiaijcr. is responsible tnr hi', higher I'XtraetJon, at .m iiu ii mm d working; cost of one .sjiillmt.; per ton; the net result iH-m;^ ti'oni I to ."s. ]ier ton ]>rotii in lavnr of the n(.'W pi. int. Our estimate rm which the jilant wa-. I.uilt wa'- a nit iniprost'iiu nt n| I-., prr ton m the ])rotits. It i> interi'stinL; to (,l,s. i-\c that the (.'hairm.an of the Xew (ioch, who is alsii Cli.iiiiii.iti "I the Me\ei- \- Charlton. Ntatcd m his annual address iii I!iii7. w he!i dealin.!.; with the operations for till' jiast \eaf. that "thr laiLjir protlls roultini; itroni the \car's workdia\r more th.ni lUstitii.l the ixpriii in uir uriuriiii in the additions to. and Mllplo\ rtlU tit 'i|. the Jihuit " He tufthrf >t.itrd that "the toiiip,in\ had iifoilurrd iiinrc ;^i]ld and lanu d a l.iii'.cr pfolit tliaii if. anv prc\iou-> M-ar." the aiitial (i'.;iiri ^ l.ntiL; \Mth the old plant U'V MKI.", a ^jross piotit m| / !i'.i 7s|. ati(| with the iii-w for the year I'.KHi a ijross ]irij|it oi ;_ 1 :i(),!Mi7. i rr .m iiu rca>r of o\cr 'Ml |icf cent. The ijucslion now arise-, win. with the Me\ cf iV Charlton plant. s;uh ni;e_;ni!ieent results Ii,i\e lieeii secured, .md \'. h\ at till' .\ev. (ioch tlle\ have ! 'eeil sci i Iisappoiiit iiiL; as to v^ui.- rise to the cnlii'isnis ami dainniiiL,' staleim-iit ■, nl \iiur eon-es]ji mdi'iit . We ari' in i)osili(m to sa\' tli.at 'hinte^' the tmie wt were in eipntf"! "I the plants, we made cinplete clean-ups nt' the ticw Meei f \- Charllon plant, tir-t. t" satisl'\ Mursehis that the i;o|d called tnr. as intwi'en t!ie sereeii assax'saiid the residuc-assav's. was 111 the plant, and suhseipient h. at the instance i if the Chair- man ot tile coinpain'. on ninn- than one oecasi.ni. to satis!\" his douht on the mattei'. The cle,ail-U|> was m each case a com- plete \-iiiilic:itii m i .f ( mr met hods, as we h.-id in each case .a jilus extracti'iii. In the face uf these I'esults. and of tie actual I'cc.iril of tlu' .MeN'cr \- Charlton with its niw plant, for I'.Mtti. we think that \ nu n ust at,'ree that \-oui' correspondent's strictures. ;ind his coiieluihti'^'' ohscr\"ation that "it is tortunate tor the rest of the R.iiid that conser\',iti\ (' counsels pre\'.iilcd. ami that the 32S /v7-.( i\ I I )\\ii>i ri< \i i h /•; mint's of iitluT >;ri.uii> dul iMt take ii]) tlic iiutallikruiis --i li< ii . , -.. I)orsistently iironuilKatcd |p\ the Mi'ssrs. Denny." an- unfair. It is ratlicr iinfurtunati' for \-our lorri'spomlcnt that this final stalciiu'nt vlioiiM in an\' case, so inaiiuratfly rc'])rfstnt t ho actual situation. W V Wen- solely rfsjMmsihli' for the inlnxhuiion of tulie-niijls, anil tile leailin),'. if not the only, aiivoeates for fine-Krimlini;. anil s.eoni!ar\' anial),'aniation. t)ur jirincijdes have t ei n aeeepteil ami a plant to earry them out has hecn installeil on i \ery up-to- flate mine on the tielils. We are a),'ain solely responsihli' for l.'ie introiluetion of tilter-presses to the Rand. Slowly. l>ut surely, 1hesc applianees are lieinvr installecl. ami no less than live liij; mines are at the moment i)Utt.n),' thcin in We are solely n>pon- sihle for the introdnetion to the kand mI a new form of mortar- liox. in which llu' water fee;olil yiidd have lui-n cxpcrirm id. whirh on that particular mine is no ni-w thini;. W'v assert wiilmut aiiv ti • uf i-ontradietion, that I hr ci!il\ 'iihir iiiiiu nn wliu li wi tn^tal 1 a plant, where the dKNapiKiini nil 111^ uidn atrd h.ive luvir rxisted. a conijilrte clean-uji ot the plan! li.i-- aUv.iv •- ^hown r.ithir more .!,'"'1'1 than the .screen-assay i.illrd lur, Tlir rcvir^l.i. tn the so-called de- e;int;itinn sv>;teTn. .ilinit \\!iu h llir Cliainiian uf th'' \'ew Cunii and viiur innv .pundrnt li.ivr hulh iii;idc --i > imu h . di»-. :;.it iii- vahdate line siiil;1i prim ipir ul mir Mhenie. mr i au--i the slij^ht- e>t allcr.ili' ill ti I (Uir jilaiil ■-. Ill her 1 hall the sulislilutioii uf water for Weak rvaiiidr Mihitiiiii, and ,i dam tur reeriviiiL; thr shiiU' and >"Uui(iii iMini iiur vpiiMll\ drsi'.^'md shine plant ^. which latter, as a iiiatti-v uf fait, uc pnividcd licfuvc the plant was starti'd. 'I'lie wliiilc uf the details uf this scliclllc wc wuvkcd uul . and succcsstullv pr;i( liscd .at llic\';in Rvn iiinn', with ;m cfniipnicnt uf Hid stamps. We are surrv tliat an cx]ilanaliuii ut' the I rue pusitiuii m cuniiectiun with uur plan! has neiessilatcd ^u nnu h space, hiK We lielieVf it to he due tu nur friends and uui'sclvcs lo state liie ]iusuii)n lullv and lii^ariy. i)i.\\v i-ikiw . Luiidnn, June 27. I'cr (1, .\ je-wv. 'I'Lin-; MIIJ.S AT C.L AXAjlATo (AuKuit 17. HKl"! The Kilitor: Sir — As to nur r\|nTictu-i' witli mui- tul]^^: Appari'titK ii has liifii in;irkrill\ .htlcnnt fmm ilmt of a j;(K)(1 T-.ian\- pinplf. and ur ivall\' do not umhTsiaiiil tlic na-^un wliv. as \\v h »\f had nu dirtiiulty whatsmn-jT. asid< ivnm iduiinr rfjilart'iiu'nts in the fiifht or nine mnntlis \vc hnw l.cni running; thnn. Tlu-se mills, a< \(ni knnw, an- llu- AMm' inilN. t ft ti in \>\ I'd ti . and are haiidhiii; almut Ml tun^ A scrt'ei) t( ■ tiiadi' ! I'lilp pi'V 'law III pulp '^oiii',,' \i tlU' till KfiiiaiiUMiJ M, ■ ill I li I S(i ■ Kill IJII Pa^^uij IJII Mi>l-,turr tiO pii- ( lilt TIk' sirtrii tr>t nil disi hari,'i-pulp M,,li Ki'tn.iiiiti^ . Ill III .'ill I ill Ml ■■ inn ■• IJii I'a'~Mnij r.'ii ^liiiws: I', r I I nt I I J I I -• s ;• in n In :{ jn I '.t 7 iT I I'ln II .'i 1 7 J , n r> n in .' Ji s .')| J Mrclianicall\' tlir mill-, hu\v 'j,\\vn us no ti-nuMc sinci' their installatiun, with thv t.'xrepticin that thu tirst piniun shipped ..ith the mills was shrouded and the distanee between the shrouds was not suftieient to allow tor an\' end motion whatsoe\er of the mill as a whole, and the >,'ear ultimately rode the shroud of the jiinion. sniashin.i,' hoth the ijear and the pinion, Imt doin^' no further da!na,i,'e: sinee re'datint,' with a pinion wider hetweeii tlie shrouiis, nn ditfii ultv whate\er has been liaii. To limit the eii installril. tliat it was jKissiKlr to rant the friitinn-ri ilUrs upnn whirh tin- tire niuw-s ianil \\lii,'h mn^litutc ttic siippcirt (if the iiulli in s\irli a \va\ as tu rausr tlir niaui tuln- ti) i;') in ritluT (lirn linn iMn^ituilitiallw ami that li\ ilcjiratc a'liu^lnicnt (if ^hi^ cantiiiL;. it .>li(ml(l l-r jossililc to i((nlnu' tiic mill fiitUvh' tn (inc iKi'-ition \>,itli((Ut its hearing; undulv hard ( m lithcr uf the •_;ui(lc i-(illcrs. W'r cxi irrinu-ii tid with tlii> aiM within the tirst (la\" (ir two alter thr null wa'^ started we fdinid it ]in-silik' h\" th.is adiu>tnirnt to eausc the main tuhf to 'llnat' tntn'(']\ free im its --u|(|i( lining; I'olKi'-^ withnut tcucliini; eillur dt ti^c -m'ir- rdllns at all. and the mill ran for three months at one ti'ti" witlioiu tdiiehiir,; i iliier miide-rdller, and ncaralK it hardl\- iduelie: tlieni cinee a da\ 'Idle silex liiiin;^ of the milU ha> L;i'."ei) l; 1 sati^faet id;i , the tirvt liniiie runnini; ei'^ht nidUth- hetcre it ha(l Id In- rejilaeed, tlldUL^h at the end ' i| ahout --ix molltlis. three or four (lefeeli\"e l(ld(k> were re]'!aee(l, with a two da\s' ^hut-dd\.n, A L^reat deal (ieiien(K apiiai'enth" ujidU the truth d' the ^up- pdrtini; 'ire-- and the lidmdi;en( it\- of the material edinpc^ini; it, lieeau^e it in these tire-- the sli',4h'est ii'rcLjulan! i; dciu'-.. either as an ori'jinal (leleet or as the result cf dperatioii, liumpiiiL; would rapi(il\- ensue, which wnuld eaU'^e the (le>truetidn df the mill and jierhap-- it- fdiui'lal ions. Sd true i~- this that w'(. fdun(| on >tartini,' the lirst mill, that a tilm df ' ,,, of an iueli of ^and, whieh had aeeu- nuilated on eertain lilv sp(.ls (;ii tlie tire, eauM'd \iolent Ijunipini,', until t';e mill w.as ^lopped and the rim; tire earefulK" ehaned otf. We keep the^e tires at all timo larefulK' eleaned and a little oil is pn; on the surlaee ot the tire otiee or twiee a 'la\ . .'-inee the tiro were tirst eleane(l, there has not been the fainte-t Imni]! or \ihration e\i(leiu aliotit either mill, the mills runniiiL; a-- (piietlv and sm(i((thl\ as po^silile. The mills are kept tille(l vli.'ht'v ahoxc lelltre with pelililes. the peM de wear lieim; approximatelv J 111. per toti ol ore ireated. '-Hex liniiiLis wear ci',.;lit months; jiower to start the mill.aliout (ill h p . wliii li immediateh- drop-- to 1.'! h.]). as soon as at riinniipi,; spee(l. Trustim; that the alnive data may lie of interest to ^dUie of '■(iiir read( in, I iuanaiua". i. Mexii d. Iul\ 1 I. C, \V. \-.\\ L.uv. i().wi:\i.\(i r.MLixc. i.\ LAU.\i)i-:RS 'Scilinilir II. I'.mjT Thr i:.lit.,r: Sir 1 li.'ixc rca'l witli imiih intrrruc "I |uiu '_VI. cm i niu t\ iiiv,' lailiiiu in la'^t-irnn pipe al ( luatiaiuatii. aK nn tlic larrxinL; capacity III launi!' ''s. tln' sulijcrt is nt inursr inlri'cstin.i,' tu nu- in niv t'X]i('nnirnl-. i>n tailin;4s wliiili wrrc rKati \'\\rr quart/ ami ipiartzitr t ]iriilialit',' muih inurr ai),L,'nlar and sliarp tliaii tin- tnati'vial at I luananiati I i I tiiiil t';at i m a i;railr nf 1."', in a rirtani^ular launilrr iin niatcrial i it the tnn'ni.'ss nuiitinnnl in '^nur artii Ir unr pi uniil 111' wall r will iinl\- i arr\- ■ i!T (l.d'J'J 11 1. i|uart/. . \\hrn I lie launilcr has the innst rn n-' iiniia! \''i.ltli I'nr tlir quantit\- nf mati-rial rarrii'il, M\- cxprrinirnts alsn slmw thai with tin- iiinst rn inuniiral wi Itli lit' launilf-, tlir sanu' niati-rial with water m the pri ipurtinn 111' ~\ tu I wunlil rc(|uin' a 1,'raili' i if nearlx ■".',. Onlv^ I'li al'^nhite slime iliil 1 iilitain lu-lter results :n a \'-sliapeii lauiiiler than in a ri'rtan.milar une. M\" expi-rinient^ were eheekeil. snnie twiee ami SI line three times. \\"h\- mv ri'snlts are su inueli luwer than tlmse nieiiti- meil. I wiiuM '\kv 111 tiseertain 1 knuw Mr. \"an Law persniiallv" ami kimw the lieiires lu' h.as u;nen i an lie mitliini; lull enrreet. and tlu' ilil'lerenee must lie wholh" in the nature nt llie Iwu material.^ han- ilK'ii (this rel'ers tu the issue nf June J'.li. With enur |iernii-;sinn , and liei,".^inL; the pardnn nf ni\" lirnther em.^ineers. i ean pnsiti\i'l\- stale that the "wetti-'d pei'itiieler" has iinthiii;^ whatsne\er tn dn with the earrxini,'" eapaeit\' las far as snli Is i;n I nf a launder I'lrsniialh', I was I'nrnierh- umler the inipre^sj,,ii that it had. hut ni\ e\]ierinients ha\e 1 1 inelu.sividv ]irn\-eil that we lia\'e all been wrninj; in this assuiiiptinn. l"nr exaiii|ile, a 1 in. laumler usin^ 2" lie water ]ier tiiin. will earr\' exaeth" iinedialf nf the lailiii'-; i>\ a '_'-in. launder UMiiir •"() lli, water, and nnetenth nf a HI in, launder umul; J"(I Hi. water per iiiin., all. nf enur--e, (in tin- --anie i.;rade, that is, the earr\ ini; eajiaeitv' in sand, etc , is prnpnrtiniial tn the width This 1 ean ]irn\"e li\' tiiiures Irnni almut "110 aetual experinieilts. In the next slate- :i:ij Kl-A h.xr I ).\.\ll>l-: I'KMilci: incnl I shall pmliaKU \s,v\ in\ self iiitn trmililr, \<\\\ Mr, \'aii Law's I'xpcririuc will licar inr out. UiiiK-r llir I'l'^lU I ' iiuluii .IIS. mali'iial ran he t rails]Mint'(l in a lii|n'. ' 'n a tjrailc. \m' rmilil nut possihh' trar.spcji'I it in an (ipcn laumKr. lint tlir initial i^raiK' sIkhiM lie j^rcatcr than tiu- 1,'raiii-' at till' 1 -nil ' the siiontr til iU'\ (.'Id]} press urn whirh in an i(]>i'!i latnuli'r wmijil l.i- !iah niateri.il throui,'li the sanu' pipe W(ju1i1 he eas\-. 1 know lull well that pipes used in mills in ])laee of launders, often i;i\i' nnieh tr, luhle and it is not m\" ]iurpose to reei mi mend pipe ill ])laee of launders, except for carr\ int,' otf L;reat ijuanlities of com]iara' i\ el\' hue tailim,'. 'riure is riiort' to Mr. \"an Law's expro-ion. which I will quote, than most of us i])roIiaM\' even him- self incluiledi Would think "As sooti as rirties of sand are formed so as to cause an olistruetion in the flow . the pipe develops ludro- .static head alio\e the point of olistruetion sullicieiit to force the sand tlli'ouv;h " That is. if the pipe is too lari,'e to t;i\e the \'el(n.it\- of water that will keeji the material in sus])ension lor carr\" it on the yracK' ust'd ' ;!ien nature itself. li\' the lillim; in ot sand, reduces tlu' size of the Jiipe down to llie point where tln' x'cloeitx will lie !ii;4li eiioui.;li to ( arr\- the material off. depositin;,' it ahe.ail aj,'ain where viloi it\' is slower, until this jioint in turn reaches the earrviiiL; staije and so on. This action also shows to some extent in a launder, hut the etfect is not tlU' same as in a pipe, hecausi,' the launder can ki'e]i on tillini; up and water still Hows on top. without increasini,' its \elocii\ at that point. The carrvinj.; of tailing' in a pijie and in a lauiKJer are two eiitirel\' dilTcrent prohlenis. and do not at all follow the same laws. In tlii' pijie we dejiend mostlc on the head developed, liut in the launder on the rollinif and sliding; ai'tion down an inclined plane, except in the case of exceedin^'h' tine material, where the hvdraulic condition or wi'tled ptrimeter approximati's the ri},'ht projiortion of a launder. I liojie in another wnv to hnisli ni\' in\estii,'atior in ret^'ard to the prohlem of launder lapacitx- and to present it in much Letter form than these raniLlini;'-, Salt Lake C itv, Auijust '■'>' Ct. A, C)\ KUSTKOM ('()XVKVIX(; TAIL!\(; IX LAUXDERS ,1 li i..i.ir 1-', imiT) Tlu' Keillor: Sir Tlir lourtrnus (|iur\' U>\- mnvv lij,'lu iti \(iiir i^sur of Septfinhrr 14. atvl si,i;nr.l li\ Mr, ('■. A. ()\ crslrutii, (Irsi'rvt-s full (lata in answer. Tlu' ((jmlilinns arv not c|uito as Mr. ( JNcrstroni lakr^ tlu-in. 'Thv off t-ruslu'd is an cxcL-rdinj,' har< •• 80 4 1 ■■ 100 4.:{ •■ i;>o 10 • 1:^0 :i 1 I'assiil}.; 1 ."iO 'iN ^ Tlie line has for several weeks at a time, however, heen run without the tube-mills runnin.s,'. therefore takini,' the straij^ht batterv produet, sereen test of whieh is as follows; STRAIC.HT HATT1:RV PlLl' Mesh. Percent Keiiiaininj; on 10 •' 1 ■ :>n a 2 ■■ (io •"> :; ■• NO 'i ~ ■■ 100 ^ •' ■■ 120 11 N ■' laO I ." Passini; laO alt. 7 The normal pmixirtion of water that tliese ])ulps contain in the ])ipe-line is about ii\e to one b>- weij,'ht, and while tr.vw is no doubt that the Indrostatic head formed behind ritlles of sand in the pipe when sueh oeeur ^m- ,itl\' assists in jireventini; the eom- ]>lete eloLji^mi; of the iiipe, this aetion has onlv occurred a few .'{:! I Kl-A I: XT i WWIDI: l'/< \( I It /•; limes in ihr ci;^!!!!'!!! iiMtilh-. liial the ]'\\>r has lii-rii runniii'.;. an. I n"nnall\- has nu inllm-ni r wlialsMcxiT. L'nilrr nurnial iMnililMns, I'liiliva' iii'^' all liut a lew li'unv >inrr the hnr was nistalK-.l, thrn- aro IK] viiilcs w hals,ir\ IT in the line aii'l the upprr llivi'c-(|uartrrs 111 thr ]:\]iv is rntirrl\- clear, the pulp lli.win'^ m a siikimiIi rapid stream withdiit ripples or 'hstmiiaiiee in the IdWer iniartei' of the pipe. preeisel\- as m an open laumler. I ma\- sa\- that since a^MiiiL; the seeoii.l NO stamps, the line whieh now carries piilji Irom Kill stamps i, riinniii;^ sh-hl l\- less than half full. Mr. ( )\erstrom's ili!lienlt\' in reeoiieilin:.; tiie performaiU'e uitli manv detailed e.xpennients is shared l,\- manw Dm-im; the time oi nistallatioii of the line the "ilper of expert opinion.s passed upon wiu'ther it woiihl run or imi and hased upon experi- eiu-es with laundi'r.s, \\-a.s \-er\- lar-e and \\;tli one solitar\' exeep- tiiin, tlatl\ unfa\oral.le. We had. how, \er dem. mst rated i^xperi- nientall'.- that pul]. much thii k. r than that now hein'^ handled and soinewhat e,.arser, wouM rim freel\^ in an ideiuieal pipedme :inil tl lon'^ .m a 21', i;rade ruimiiiL; so freel\-. in faet. lliat \\e lelt instilled m -oin- to a L'l', erade to heller lit the eontour of the loimtrw The limitations of th>' line seem eh'arl\- marked. With the tul.e-mill . running;, no telldenev lo elo.^ has e\1 "I. s:i. HH, 1 IJ. .'Ill An-ni-. AIIhti I'' Arfiii- C. A l:i-' A---a\' "I' I'v.miiU' S. ■lutiMii U, .'.O, •Jill. J.M, jr,; Hink-, r:. i; -'•"'■* Harrv. 11, I' ii7, .':is Heilt.v. C. T '■' Hlai-iiU-11 A;'iiaratii-~ -' H..S-. M. 1' :■.!_. l''l Hi.~i MI, I'ran. i~ 1. -''i. -l-' :;'.i .".I ^:(, \:w. \7J. 1^1, :iii-' Hra.lKv \V.,1'. r \V Jn: Hnn.Il.l' ... l'^'' Hr. iVMi R. C.ilnian !•-', !•>. I-"'T Hrvan MilN 1 I/. Hiill.Kk. 1.. \. H _';!!, jr,.-. Hurt. i;.luiii 117. -':il H1UI1.TS, (liarli--- ■"'■">, ^-'. -'"1 Butter- l-iltrr I 1,. 17-- I s.-), J 1 ;f, J 1 \, JJT, J;i.'), J 1 1 . l2(i!i. :i I £ Caotaui. ( '■ ' '" Cas-.I. H. K 1" ChandUT. 1:. I) "'I Chia.kv. AllVrr! 1-' ChiU'an M1IU ■'•7 Chlorinath 11 '•>■' Clark.', k-!HTi -1'' Cl.-an-n,, SK.Jlll Coarse C.'M ^t Coinliiualn'ii Mill ■'' '. ''- !•"_' Concent rate. ('\ annlati. .n .a. .'J. 107 Ci aiiiii'v..' li ill -••- Con-uin|ilion of ('\-aiu,le 11 C. ni\ .vniL' 'ratliii'-: Inl'ipe .l.'!i7. :!'JII. :):!1. :;.;:( C.il'l'ir m i'\aiii'le Solution (Ml. l:;_', 11; I Co>l Hodie. . . I'"' rilterinv I'' rilt.T- 1"^' Col.ltiel.l laii. l'-- l^:i Ciuanajual' 1 -''" Hoine-take 1^7. iln'. Me'tiiK' I'ri eipitate . I'W New Zealanil. '''•' Ran.l . . •'•> Western Australia -H-' ("rosse, A '^' Cru-hitii; ''■'• •:x I'aKO Cru^liini,' ami Cirimlini; Praetieo at Kali;oi,rlie "•< I'vanulation at I'oliala iVil lAaiinlation (.t ("n. nitrate JJ Iii7 (vanHle Notes. . . ^'> i'\ anile Practice. Ho.lu '■'-' lop.,!,, Jitl.Jlia CnjeiOe Creek ' 7 |;i I In,. \Ie\U.. a.">. 11 I. l-'-'l l-ae'.or in Ce.M I'ro.ln. iioii _ 11 Ciiialiaiuati' 1-'. -"-. -al. -'■>l'< lloinestake. ^H, 17.'. l^H, all.' K,,l^;o.,rlie, 7:;. I Ml K.,re:i 1111. jr.J Mereur '•'•' Xevaila . . . l^a.aa. al. SJ. KHi -lil' Salvailor I'il S.utli Ami..! a'l. .'iiii. .'111. -'117. :;■-'.■_. Wailii Mine ''", -'■''■j \V,^-ern Australia 17 C\ .iin^le Poi-onini; l.'-'> Ceani'le Solution, ('..pper in. '.m, i:ij. nil l),.li\ .Iration '-'^i Deiinv (i. A. ami 11. S ... all. :Mi7, :v.'J. :!.'.". |),..„.rt ( Ir '^ ■rrea'ineti! ol' .'il.ti.'., NJ,:'I7 Dulil Proeis> .'<». 7:i Hire. I 'rreatnieni ^- li,,\,icin Cio,ifre\ "' Urn. ker. .\. K. 11". Itlikl^i;:; IKirant, II. 1. . "• l-.si.eran/a Mil! 1 HO ICNtraetion. .-,:i. Ill . 11 1, s.', s'l. 111.-., 1 1:;. iJ'.i. C'li. \^^. -'<■'. '-'>' l-ilterin- Co,t 111 l-ilter-l're-.> I'raeiue . ! ^. .'7. li 1 , tl.', ■ IN 1 17 i:.:i. 17 1. 1S.J. JCi. -1^. .'21. ■.'■-'7. Jiir-.-Jll. Jl'.i. .'li'.i. :il-' I'ine C.rincliii.: "'. -■'■ ■ju :ll. :'.7. 7;>, Hi, I'.ix, -•">7 Carirell 11. W l'>:5 C.enlar. 11. W ^ -'^•J C.nn.line, I'm,' Hi. -'.i, .'(I. :n. :'.7, 7:i, HI. I'.i^. -■''7 C.uanaiuato, ( 'vaiml.it loii ,it. I.'.'-'.', ■J.". l,2'.Mi ll.nnilton, K. M . .1-'. 1 (i I, 2.-- 1. -'(ii) li.,hson. 1-raneis ]. . . 12. 22 llonieslake Mill... :i02 /-WAV 1.7. r.', \'r, niii irci Hun!. Hirtr:mi Hiuitim;t"n Mill- Ir..n ;•. W.mhI 'tulum, II K(.>sl,i-. II II Kill),', I..., hul M Kirl.v. A, C, l.ainii, Mark K l:i I ji:; jis _> 1 1 I.aimilir^ I. a- r, an r\ iii;.,' 'railuiL; :i:i I . l.rai hiili; \'al- ;ji| l.inu- ll!l,:i(HI l.inniL' I a Tnlii.' MilK fa; li!) '■>r,, IJI, KiJ. lliti 171, 1!HV .'(17. Jiis Ma. I ), aiald, Aiij.:\i^l u^ ■',;- Ma. Donal.l. Mirnar.l Ml .\lik( n. S. I) |r,.> Ma.i;i'iiati, Win .ja Milliii),' I'rci iiat:itc Itil _m; I MiTiurii- Cvaniilc ■jii,", MiTrill, C. \V i7-.> :j(|.| .MtaalhirnKal Di'va K.iaiu m .iii till- Kami ;,() Mcxiiaii ('...Id aiiil Sihir Ri- i'c.\aTy ('[ aiijiaiu- ij Mi\ir ,V t'liarll.ai .Mil] on ;( '7 Mill ''"'iil'i'iatioii iM .-,■_. inii l.-I'iTan/a i:iii IliPiiU'Staki' .-((i-j .Mi'\iT \ ('harltnii (jll .■{L'7 Stan.lanl ' n> Millrr. dram I) ')", Milling' ;■. Snultiii;;. . it MilN Hrvaii ■J-Jt Jill i:i7 1J7 J7() ;•? llllia J I .'. -"•. i:.4 -'l!l. .'aL' Wt. J(), wy -'II.! :i(it) I'hii, n;i Iran ;{7 lluniinatcn ... i-^d Mil. lull. DP ! . ' ' 7s Mill 're I'lltiT i|j i|,s 174. 1st. L'l:r.:il.' Muir. D.iiii;!,!-; ■_>.-, | "^'""t'T. K.'.X 17(1 J; I ' l\ cT-tr.illi. (;. .\ ;j;j| Pans l..r (Irniilini; .'il 7s HI7. liM.'.'i.-; 1 ans ;■. Tiiln'S 7.S Parsons, A. R ;>27 Pcricilatjcm jd^ Pi'ttis. 1:. S J-j.-, I'lj.i' 1. .r ('..in t-yina 'railin,a -JUT :!_'il •'■'.-''■ P:ij;i- I'll . ii'iLilinn s(i s!i l-'C. l.i.'. 1:; I, :ilii I'r. .jn-- 111 C\ .mnl.ii n m 1,7 | 7a ><•' l-"-.|. T. .\ III I.'.-, _..-,)■ a,„", Kalu"Aa\ l-ihiT l\. la-1 111a S,iiiiplin;j T.iihia.; S.ilnl lii,|,.\ Si 1 lliliirtll I .1 Slllllf Sri lima \'ai> Si].li..n I. ir Ki-iii..\in.j I" .MaliTial Slinu- Diliniil Sliinc I'llti r. Slniu- 'rrr.iiiiu'iii lis. .'III. J.-.s. S..lini.,n .Xv-ax .if J 1(1 a- I -j,.- '■'•I'l'ir HI . . I||| l:(a ,,;, Miur 17,, < l.wi;,-!! m. 1,-,-, Strnimh nf .s'l. 1 \] iji; M.", Stamlaril Mill ' <,a SirVfiis. I'. H .'ls Stini's. \i.nnan 1 ' ,■,() Sirrn.-lh i.f Si.hnii.ns.. si, .11 r.'ii. H."i Siilphiilc ( Ire. Tn .itiiunt li) 14,s Tailina Sani|il(rs | -,7 Ta\s. I-;. A. II ,s,| Thi.inas. Jainc's K j|() Trfutnicnt nf Di'siTt ( In-s. . . .".1. li.", ^'-',-47 I rratnunt ..| Sliiiif Hi I'll 1 ' >'. - I'-', -'ax. Jiiit. ■jii:i.';-rofi Trratimnt ..f \'at •>,;.) Tulii-Mills. " ~ I'alit'nrnia , , iji 1 7-, 'V';'^^"'" ' .17^ Kalaiiiirlic 7s li)] l-^"r'-:i ' ]]() ianmi; of, ,-,,•, ,;<( '■>■'>. I-' I. Kil'. Kid, 171. 1(1(1. -.'(17. -J.-iH -■^l^^ii" .'i.'.. l.'d, .'I.", :{J!» \f\aila 1 4(1 < In thr kanil -,i, -{a^ Pcl.lilrs ' ' ' .VS \'an Law . Carlos W i.><.)7 ;ja,, ... ,, •'-'■'. '■^'■^'■^ Wallaio. .\. B 1 ,s Wianl. ICiluaril S J] - Zmr I lust s(l. 'vM Zmr Dust :■. Sha\ ina . S(| Zini. Slia\ ma s(i 1 Jfi (B By the use of the Garvin Method the values in your ore can be re- covered in one-third the time, both economically and efficiently. (J The application of this method is not only to gold and silver ores, but all ores which can be successfully treated by wet process. flj Why cling to the old time system of leaching or zinc preci pitation, when you can save one-third the time by the Garvin Method and secure better result"^ ? (V If you'll allow us an opportunity, " we'll prove the truth of the above claims. Better send for a copy of the Catalog, anyway. Let us make an actual working test of your ore to demonstrate our claims for this method. 400 40I EQUITABLE BANK SLOG. LOS ANGELES. CAL. Garvin Cyanide Extraction and Development Company 186 MORRISON ST., PORTLAND. OREGON SS WALL STREET NEW VORK An Ideal Outfit for Refining Cyanide Precipitates Braun's "Cary" Hydrocarbon Burner and Melting Furnace Cary Hiirnt*rs and Furnaces J arc inailf in .several .sizes. Send for our New Catalog "R." the most fompreliensive lnH)k published covering Metallurj^ical Laboratory Apphances and SuppHes. 576-584 Mission St., San Francisco, Cal. F.W. BRAUN 409-415 E. Thlrd:st., Los Angeles, Cal. Steel Cyanide Tanks CONICAL BOTTOM STEEL TANK Work all done with automatic machinery of our own desijjn. Perfect fitting parts guaranteed. Special attention given to shipments for mule back transportation. ESTABLISHED 1872. 35 YEARS' EXPERIENCE WM. GRAVER TANK WORKS STEEL TANKS AND PLATE WORK EAST CHICAGO. INDIANA STORAGE TANKS All Sizes Write Us All Purposes WARREN CITY BOILER WORKS. WARREN, OHIO r The Filtration of Slime by the Butters Method gt[ Tlu irLlTKRS i>ATi:\r V.\' LTM lll.rivK i^ tin iii:; a prfM 1 nl thrrc vrars. • .n a nlirlliuus low -nuir tailiii'^ (li|H,sit. l.\ Mr. ("liarUs liuttirs aii'l ass.niatrs al his work-, ill \'ir:^itiia ('il\ . Xr\ a'la gn Till- HuUi-r-. I'ilt'.r will imsitivrlv iiurcaM' tlic cxtradioii ^1 Ml the \alii.s lul.l in solutions of slow s.ttlin;.^ sliiiir, whi.h ran Kc snnisst'uUv an otn|plislu-.i witli'nil tlic ini- l,l,,\!iu'nt ol skillnl lalioi- lo o|.' rati' unnrrrssarx nia> 1 r x gB Tlir oprraUon of the I'lltcr is lonlinuons. tlu' filter- ^1 lra\.s iTniaii;in- in tlir lioxrs for months at a tinir wiili- oui altrnlion or distnrliani r, thus cHniinatinu ''>c ( xjh i:sr of rr|iralcil lianilliuL; and nnncci ssar\- strain to tlif ian\as. Til,' lit'r of tlir lillrr-lra\rs is uni UK siionaM\ lon.ncr ami tlu' prartUT rlrani'r ami niorr rttiiii-nt. |ff An adoption of a Huttrrs all-slinu- tnaDiimt jilanl in ^1 t!ic (\anidation of vour orr will also iit-rinit of a savin- ,,f .Sli |.rr >'cnl less tank lai^atitx- nnuircd. |Tr Ila\in'4 provi'd the tiscfuliuss of the i'ilter wc soluit nl t!ir fnllrst in\< sti;4alion ot Miniii'^' Kni;inrrrs. Suprrm- tnidi-nts. and Owner' interested in e\ anide treatment. £[[ We are ]irepared to desii^Mi and superintend the in.stalla- ^1 ti.in of a eoniplete plant for \ on that will he hotli eeoiionneal and produetivi' of an iiu reased extraetion. WE ARK WORKING UNDER VALID AMERICAN AND FOREIGN PATENTS AND SHALL PROTECT OUR CUSTOMERS Attention iscalli'l !" ilif aitiilc on Kiltration ol Slinic' in this v..himc liv !•; M H.imilKin. for a history of the cUvr-loiiimnt of llif Hiiltii-. mcth'>il of Nlimc IrraliiU'nt. The Butters Patent Vacuum Filter Company, Inc. VIRGINIA CITY, NEVADA, U. S. A. Apartado 1578, Mexico City, Mexico jLl Ia m \ /J P^ The Kelly Patent Filter Press is a self-contained, self-discharging tank pressure filter, which can be operated by any convenient means such as, gravity where sufficient head is available, compressed air, where montejus are preferred , or pumps of either centrifu- gal or plunger type. Filtration can be performed at any required working pres- sure, up to one hundred and twenty-five pounds. Its chief points of superiority, which will be appreciated by all cyanide mill operators, are: Absence of leakage, accessibility of filter diaphragms and individual discharge of filtered solutions therefrom, quick discharge of slime cakes in dry and compact form affording maximum conservation of water where this commodity is scarce, and economy in operating cost as the result of merely nominal amount of manual labor involved. FOE FUETHEE INFOEMATION, WRITE TO ^^.m^ {^^ The Kelly Filter Press Company ^^p 4|h^ 149-151 Pierpont St., Salt Lake City, U. S. A. MifeJ^ Recent Valuable Publications Journeys of Observation M)0 pd'^cs. T A, Ku i.AKi' The Fire Assay of Gold Silver ami Lead Ores and Metallurgical Products ,S,S' pa'^cs. Li-.DNAki) S. Ai sTiN . . The Metallurgy of the Common Metals Dredging for Gold m California 220 pa^i's. l)'.\i