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Tous les autres tixemplaires originaux sont film6s en commen^ant par la premidre page qui comporte une empreinte d'impression ou d'illustration et en terminant par la dernidre page qui comporte une telle empreinte. The last recorded frame on each microfiche shall contain the symbol — ^- (meaning "CON- TINUED "), or the symbol V (meaning "END"), whichever applies. Un des symboles suivants apparaTtra sur la dernidre image de cheque microfiche, selon le cas: le symbole —^ signifie "A SUIVRE", le symbole V signifie "FIN". Maps, plates, charts, etc., may be filmed at different reduction ratios. Those too large to be entirely included in one exposure are filmed beginning in the upper left hand corner, left to right and top to bottom, as many frames as required. The following diagrams illustrate the method: Les cartes, planches, tableaux, etc., peuvent §tre filmds d des taux de reduction diffdrents. Lorsque le document est trop grand pour dtre reproduit en un seul clich6, il est filmd d partir de Tangle sup^rieur gauche, de gauche d droite, et de haut en bas, en prenant le nombre d'images n^cessaire. Les diagrammes suivants illustrent la m^thode. ata elure. 3 UX 1 2 3 1 2 3 4 5 6 «i Section IV, 1888. [ 63 ] Trans. Roy. Soc. Canada. V. — Notes mi the Nova Sivtia Gold Veinn. / / By if Gilpin, Jun., A.M., F.CJ.S. (Re-Kl May 28, 1888). Ill this (oniKMtiou I iifcd not dwell upon the iigc, extent, nnd 0 feet, and extei'ds down to a depth of about H,000 feet. Considering the foldings of the strata vertically as well as horizontally, the dejith of ^ 64 (ilLPIX ON NOVA tho ground poriuiltiiii;- Ui<' tonnatiou of veins would !»<' uicaKurcd liy tht? lin»! where Ihts |m'8Hurc in (he synclinals < ounlerbalancod tlu' rclifl" allbrdi'd by the antirliual clevatious. Wliatcver n])))roxiniati(iM lin'on-iical ralculatioUH may allow to this line, in view ol" tho Ihitkiicss ol' the sir.ila iiuncrnrd in thcsi- niovenicnts, it may sal'cly Im' assunu'd that i( is at a depth beyond tlie present rea«h ol' the miner. Mr. V. 15. Ihilkely in a paper read be- fori' the riiiladi'lpiiia (Isst) meelini; ol' the Anieriean Institute ol' Mining' Enuineers on the intrusive bedded I'elsite dykes ol" Fjeadville. Colorado, puts this view as follows :^That the ai)pliealion to rock beds of a tan' but to their partial separation, and in this eonne.tion LTavily beeonies an important factor. The followiui"- linure, taken fr«»m his paper, n-preseiits an iib'al anticlinal fold pro- duced by Die horizontal for.-.- PP. Thus the resuUant F P" of this force asapplied at O and O', shows an uplill applieil ecpially to all the strata, which is con.seqiiently exerted with increasing' ell'cct uixm the ui>i»ermost sheets, causinij' a tendency to separation of the strata. The force of gravity is repivseuted by GO, GO", audit is evident that at tho ^ p Fio. — An ideal anticlinal fold. suuimil and at the foot of the anticlinal, as at O Othis w'hole force is exerted in a direc- tion at right aiiiiles to the bedding planes of the structure, its whole ettbrt l)eing exerted to prevent a separation ol the strata, while at other points, midway between tho foot and summit, at O", the force tjuis exerted is much less. .Vn analysis shows that the force exerted at riuht anules to the plane of the stratification is directly proportional to the cosine of thi' auiile of dip. and is reprcsi-nted by G' O" Slratiuia])hically. the Nova Scotia veins conform to the conditions implied in such foldinii's. The i)resent surface of a irold held may be represented as a horizontal section of an anticlinal, in some rases drawn near to its apex, but freciuently so low down as to expose nearlv all the beds of the gold-beariuur horizon. Mininti' explorations in numerous districts have shown thai veins, several inches thick at the surface, gradually thin and disappear within short vertical distances, that "cross cuts" driven at various depths below the surface have intersected veins which did not outcrop, aiul that some few veins have maintainefl nearly uniform dimensions to depths varyinu' from 800 to 700 feet, the maximum dei)llis as yet attained in our workinjrs. The lateral thinning out of a vein is often seen to be succeedi'd by the commemement of another a few^ inches or feet to one side of the line of its course, as well as the passage more m less ibrupt of the plane of a vein thro\mh a bed of rock to resume again its normal dip. Similarly, veins have been known to turn almost at right angles across the strata for a distance of a few foot or yards, SCOTIA GOLD VKINS. and then to rcKUini? their regular coiirhc. It imiy he noted that those hiHt-uiontioued irregularities are generally accompanied ]»y dianjres in value. Incidental to tho flexures of the strata are irret>ularities in the dimensions oi' the veins, corrugations of the wallH, cross leads, feeders, etc It need not, however, he assumed that the movcnieiils of llic strata were either abrupt or continuous, rather they were slow and inleniiitlcnt. Tho lillHn<>' of the iissurcH was, generally speaking, continuous, and as each opportunity was olfered the proia'ss of vein-dej)osition began. The relative dates of the secondary disturbing forces cannot be given, but the latest known evidence of marked action in tlic ])rovince is the Triassic trap of the Ihiy of Fundy, which apparently did not alfect tlie aurifenms measures lying a few miles away from it. The fact that the auriferous nu-asures of Nova Scotia are at many points interrupted by masses of granite, has been frequently refeircd to as haviiiu' a id-l)earing veins butt against granite, but under sucli conditions ni» diaiitre in their values I'or better or for worse has come under tin- writer's notice. The granite protrudes in the strata with ••om- paratively little disturbance, havinsr, as it were, melted its way through. The evidem-o is in favor ofthe granite beini>- later than tlie foldings, altliough it has frequently pressed itself along the bedding planes for coiisideralile distances. Tiiis view is boriu> (uit by the sections at Mosselaiul, near Tangier, at C'»mntry Harbor Narrows, etc., where the i)rox- imity ofthe granite has iu)t atlected tlie values ofthe veins. Tiie varyinu- i)roportions of sulphides of iron, copiu'r, lead, zinc, etc., under these coiulitions^ not Itcinjj unukittl Uy predominance of any i)arti<;ular mineral. Nor is tTn- (piarlz tilling clumged from its normal character beyond any slight variation due to metamorphism of the small percentages of lime, e^^c., commonly occurring in it. In this conmM^tion the summaries given by Von Cotta in his "Treatise on Ore Deposits," oll'er a striking contrast. The granite itself has not yet yielded any noticeable metallic deposits, although fre- quently holding irregular veins, lillcd witli quartz, felspar, etc. ; nor have any contact segregations been observed near it. An exception, however, to this rule is noticed at Dalhousie, Queen's Co., where copper ores occur in veins in granite. The intrusive dykes, etc., ofthe neighbouring Devonian, on the contrary, are fn-quently associated with metal- lic deposits. This fact may, p(>rhaps, be safoly brought forward to exi>lain the surprise of miners from abroad when they find that the ground close to the granitic nnisses and dykes does not prove specially metalliferous. In Cornwall, for example, the strata have been elevated by the granites, not inaptly described as now protrudiim- like islands, and mantle round them. The granites penetrate the slates much as they do here, and present them usually with greater d«'grees of metamorphism, and the metalliferous values of the strata apjx'ar to be due to the " Elvans," as already noticed in the case of the Nova Scotia Devonian in some localities. But in this province, the granites, presumed to be later than the strata of Oriskany age which they penetrate and metamorphose at Nictaux, were not accompanied or followed by tho enriching dykes such as are found in the Di-vonian of Salmon River, Lochaber, rdsou's Lake, etc., a few mih-s to the north of thi' gcdd measures. When these veins are considered as unaffected by the proximity of granite, and as surface veins not penetrating to underlying and possibly metalliferous strata, it would Sec. IV, 1888. 9. 9R 66 (ilLPlN ON NOVA appi'iir that tlu? vein iiialtfr hiiH bfcn di'rivfd from tin- iiicasurcs encasing thfin. Tho cross vrius iiavr not, lu-cn llir im-ans of iiUrodurinjj Ihc niintTalM, for tlicy, as wvll as tho faults, arc ohscrvt'd to shift and break veins already mineralised, and th«y seldom exert any appreciable eifect on their values. The former not iinfreciuently show the gold canght in the l)re!iks us Miioolhed out or " slirkensided" pliites. In a specimen from tho Albion Mine at Montagu, where a break had intersected a very rich portion of the vein, tho smoothed plate of gold had a superlicies of several square inches, and a thickness of about one quarter of an inch. The knowledgi' of these facts has in somace. An instance has been noted where, at a consider- alde depth, accident revealed at a distance of a few inches from a worked lead, a thin, paraUel vein of quartz having a sui»erficies of a few hundred square feet, and so far as observed totally unconnec'ed with it, but riihly charged with gold. It not uufrequently happens that the workings of a mine embrace in a width of two or three feet, two or more parallel leads, one of which only is valuable. Here, apparently there have been succi-ssive oi)enings, only one of which had directed to it the gold-bearing agencies. The contemporam-ous iilling of fissures as they opened one after another would, possibly, explain the last two cases. The theory of the undulations would assume that, near the anticlinal, axis the veins would prove, comparatively speaking, larger and more persistent. The well-known Dutferin Mine of Salmon IMver, Halifax Co., is a good example of this. It is situated near the axis of the district, and its width varies from two to twelve feet, and at its eastern end where it attains its maximum thickness it forms two " Saddle Backs " branching out as it goes down. From this mine, which has been worked horizontally about 1,200 feet, and vertically about 250 feet, aboiit 55,48:5 tons of quartz have been taken out, yielding 2t,814 ounces of gold, the average yield per ton varying from live penny-weights to two ounces to the ton, and no pay streak being recognised. It has also been remarked of several districts, where the foldings have been pushed to cause overturns of the strata, that the veins are, as regards size and persistency, best adapted for mining. In a few cases leads of moderate size have been traced on the surface for several hun- dred feet, and hav(i yielded at all jioints on their course, aiiKmnts of gold constant but not large enough to tempt the miner's ambition. There ar(> also met in numerous districts large veins of compact milky quartz, containinur little mineral matter, and yielding to the stamp mill no returns. These veins are probably among the latest products of the fold- ings, and serve to complicate the study of the subject, unless it be conceded that some essential of heat, time, etc., by its absence or presence, prevented the accretion of the metals, etc. 68 (ilLlMN ON NOVA Tho profiodiiif? roinarkH havo had rofcronct' cxduHivi'ly to tho Vfiiis which, ho far as our iiiiiiiiig cxpi'iicncf lias tfoiic, rivitl in imi ciilritily "t vului', locally and lyciicrally, the coiiiiiKiii iisNurc or ,scirrr<^atc(l dcpo.sits. and arc in sonic dislrictN ctjiuiliy disturbed by laultH. There is a distinction of int|>ortanc«! to be drawn here, i. e. that, while in a true or rroHHTountry vein the Icnjfth ol' urround perniiltinir the formation of pay cliiniueys is very great, in the Nova Sii»tia veins, the lontritutlinal sjjace is comparatively limited when considi-red in reference to a series of riih pay u;round zones. The jxtwer oriirinally exerted at any point to pcrniil tli >nditions favoring the formation of a vein, was modilied at u short distance to yield similar conditiouH at a point more or leH8 to onu Hidt> of the plants of the first consich-red vein. The result, th«'refore, iu that theoretically veins iiro rupn^- Kcnted as thin laminu* with I'uds almost overlappinir. I'ractically, the miner in our gold districts, ignores this consideration, for while he deserts a vein as soon the quart/ proves unremunerative, his next attack is directed to the nearest outcrop hu linds that presents promise of profit. Hitherto the niiniiiir industry has been almost exclusively oct^upied with thi'se small Veins, and the returns, aithouiili saiislactory to liie individual miner, are seUhun equal to the expectations of cxtensivoints. This greater richness of the slates is n ot accompanied by any cliaiige in the strata or its veins, beyond, iMirhaps, an enlargement of the beds of slnTe, This extra percentage of gold in the slates does not interfere with the values of the veins penetrating them, but it may, I think, be fairly -stated that they hold their gold contents more evenly distributed then elsewhere, and aro not markeeii observed that many beds carry very minute crystals of iron pyrites, forming in some cases perhaps two per cent, of the ma^.«. Under such conditions, small amounts of gold can be detected. Assays nuide by mr of quartzite from mining operations which did not show any metallic admixtures, yiek^od barely traces of gold. If it were permitted to consider the auriferous strata lying comparatively undi.'siurbed and traAvTsed by true lissure or cross-coiuitry veins, and the quartz filling to have taken place, the «onditions presentt'd to the miner \A(Hild have been of veins more or less en- riched when passing across the alternations of quartzite ami slate forming the ordinary ground, and having extensive enrichments in the spaces just referred to as forming low grade ground. Such a view of cross-country veins in the Nova Scotia gold fields is fairly in accord with the results met elsewhere, and in fact, veins of this class occasionally , SCOTIA fJOLl) VKINS. mot in tht' upp»'r or whitt' diviHion of th»' gold Htruiu, wltirh Ih ffobly auritt-rouH, do curry Hinall aiiiounts of ^nU\ over lOiiNidcniblc iliNtaiKvs. From llit-m' roiisiiliTatioiiN it would appear most prohalilf that th<* Hourcc ot" tlu' ifold in tlif Nova S! woiki'*! vi-iiis prcs-nl slali- nn on«' xnU; and iiuarlz. rti-., on th<> oth*>r, it would appear that th<> diviKJon lin*- h<'tw>*cu strata ol'NUrh dili'iiinu' lUxiliility oH(*r«'d the rcadicNt plan*' of openin^r. If the qufHtions, then, l)f raised which nnitfrial furnisln-s tlic jjold, an answi-r may In' Nought in tin- consideration of which wt>uld l»o uiohI likely to receive and retain it. So I'ar as the suhji'ct has received attenti«in, the slates appear to he Ihe source of the gold. The metal, in common with various metallic compounds, nuiy have been carried und depowited in the various layers as they were forming. That which fell in the sand would, prestiniably. for the greater part, accumulate in the underlyina- bed of denser ujaterial, forming the lirst .stage in the concentration now presented. In this connection, the fact that arsenical compounds of iron are present in large amounts in the veins in several districts may be referred to as an interesting example of the local segregation of an element which is, perhaps, most abundant in rocks approximating in age those now under consideration. It is also i'recjuentiy observed, that wliiiethe vein is attached to, and passes into the slate, the junction with quarlzite is well dejined. Prof, llynd, in ri'porting to the provincial government ou the Wuverley gold district, und assuming the veins to be contemporaneous quartz beds, considers the gold of the pay zones to have been contemporaneously deixtsited in them as 1«"<1>j ''roiiiMMiie^ji;^ trolling cause, such as the presence of vegetable matter. It may, pTrluips, be more rcidily understood that the gradual deposition of gohl from currents in the betls of (lay or mud und sand might, through spi-cial currents, be acc«-lerated or specially increased at certain points, and that from this enriched material the veins derived their "pay streaks." The discovery of rich zones in any lissures vein is, 1 believe, seldom a matter of calculation beyond, laterally, the nature of the encasing strata, and vertically the shape o| the lissure permitting of ed to test the question by deepening some shaft worked in one of these pjiy streaks to a depth of, say, cue thousand feet. It is assiimed that by taking the line of the greater axis of the pay streak, rich ground may be found agiiin after a barren interval, or that by a vertical sinking another underlying and distinct zone may be reached. The plausibility of tho argument may be conceded in speaking of lissure veins, but ill these veins, whi<'h have, so fur as mining experience has gone, very definite limits, and a limited ived. If some of the veins have rii-h zones, due to lateral enrichment, the persistence of the line, however interrupted, of the underlie of the zouos, would depend on the original (conditions of deposition of the gold as a sediment. If it wore possible to reconstruct a chart of the ocean of those days, or to assign any direction to its currents, then some foundation might be secured for applying a rule to the courses 70 (JILl'IN ON NOVA SC^OTIA GOLD VKIN3. and (liiiifiiNinnN of the pay strcakH. An yet no ininini; company haH pfono to any exponno ill tt'Ktiiip; tho qut'Ntion ; the only stt-pM in this dirfrtiou arc tho olmcrvatiouH that in HOftio dintriils the varionH pay Nlrcaku havf occurred aloni,' a vt-ry limited liorizon of tht! bcdH. uh il at that point of time, in the oritrinal deposition, the j^ohl had heen introdiuM-d more j.lenliruliy. and over an extended area, and that in other districtH the best payini? j^round lies in Mocks, not on tlie same line, ])ut to the rii^ht or left of an axial line running longitudinally throu<^h the diNtri(;t. OiUlfVki -aM **» ♦ .^^/l-OI**^ i L«a Ji TruiM. n S. C, ISS8. S-r. IV. I'liilv III. i