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Les diagrammes suivants illustrent la mAthoda. 1 2 3 1 2 3 4 5 6 :i k:< n I ) OrU RR!v\( i I XTRVCTiOX. ' i'l M \ I i'\ ' ) (', ; ' ; . .( \' ■> I ■ i 1,1 ■kRi ■■'■ ■ii. ')' .-. i ;.. KS ' ■ V ; . : V. I > . ^v I .\ . , ;:,. - T ■.Xj FUk: . . "• V, ', ' Ti4\! M i ki- ; > < . ' ' H K !• i- ■/^A •"-'<;.■. :' . f«S ■ \. >,■ ■ ,7,v-* Y / .^:^^ K .p, ML KR.-. \ s| ,<|,] r. %r' Klti \ m^' ■r''.f^ ■J *V GOLD: ' ITS OCCURRENCE AND EXTRACTION. ^ '•V, J EMBRACINC. THE GEOGRAPHICAL AND GEOLOGICAL DISTRIDaXION AND THE MINERALOGICAL CHARACTERL> OF GOLD-BEARING ROCKS ; THi;. PECULIAR FEATURES AND MODES OF WORKING SHALLOW PLACERS, RIVERS, AND DEEP LEADS; HYDRAULICING; THE REDUCTION AND SEPARATION OF AURIFEROUS QUARTZ; THE TREATMENT OF COMPLEX AURIFEROUS ORES CONTAINING OTHER METALS; A BIBLIOGRAPHY OF THE SUBJECT ; ^ AND A GLOSSARY OF ENGLISH AND FOREIGN TECHNICAL TERMS. nv ALFRED G. LOCK, F.R.G.S. WITHSfX DOUBLE-PAGE MAPS, AND 185 ENGRAVINGS IN THE TEXT. LONDON: K. & R N. SPON, 16, CHARING CROSS. NEW YORK: 44, MURRAY STREET. 1882. INTRODUCTION. ?^ The possession of gold has been the aim of all races, in all ages, and of all chusses of society. The quest of gold has led men to the ends of the earth, and has been the primary inducement in colonizing hitherto N-B.— The section on Russia is entirely from the pen of E. DELMAR MORGAN, P.R.G.S., the weU-known explorer of Central Asia. cuuuiLious unuer wnicn gom occurs, so tnat new neias may De opened up to supply the places of those which have been worked out ; and they make it the duty of every intelligent miner to avail himself of the experience of others, in endeavouring to reduce the cost of extracting the gold, and especially the loss of metal in conducting his operations, to the lowest possible figures. Recent geological explorations have shown that gold IS abundantly present in formations which it was authoritatively stated could never prove to be auriferous, and in the light of our present knowledge it would not be safe to exclude any geological series from the possibility of being gold-bearing. Gold reveals its presence in the earth's crust far less readily than other useful minerals, and many a gold-field has been passed over by generations of men before its riches were dis- covered. Hence the necessity for intelligent search. It seemed to the author of this volume that a great step towards aiding the advance of the gold industry would be to bring together in a concentrated form all available existing information on the subject. The i! i K Ijf i ,14'St INTRODUCTION f ^ L The possession of gold has been the aim of all races, in all ages, and of all classes of society. The quest of gold has led men to the ends of the earth, and has been the primary inducement in colonizing hitherto unknown districts. Without the great gold discoveries of the last 30 years, our commerce could not have attained its present vast proportions. The importance of the metal especially to all English-speaking peoples cannot be exaggerated, and every year adds to this importance. On the other hand, the supply shows a waning tendency. The enormous, easily- worked, alluvial deposits of Australia, California, and Siberia, have been exhausted over large area.s, though many similar deposits must yet remain undiscovered. In the more difificult operations of extracting gold from mineral veins and complex ores, reliable evidence from all parts of the world shows that most of the processes at present in use, or the methods of carrying them out, are far from satisfactory, as they entail the loss, on the average, of one-quarter to one-third of the gold present in the material operated upon. These facts point unmistakably to the necessity for studying the conditions under which gold occurs, so that new fields may be opened up to supply the places of those which have been worked out ; and they make it the duty of every intelligent miner to avail himself of the experience of others, in endeavouring to reduce the cost of extracting the gold, and especially the loss of metal in conducting his operations, to the lowest possible figures. Recent geological explorations have shown that gold is abundantly present in formations which it was authoritatively stated could never prove to be auriferous, and in the light of our present knowledge it would not be safe to exclude any geological series from the possibility of being gold-bearing. Gold reveals its presence in the earth's crust far less readily than other useful minerals, and many a gold-field has been passed over by generations of men before its riches were dis- covered. Hence the necessity for intelligent search. It seemed to the author of this volume that a great step tovv^ards aiding the advance of the gold industry would be to bring together in a concentrated form all available existing information on the subject. The b 2 i&:535 Nit / vl 1NTU(J1)ICTIC)N. f 5 f handsome work written some years ago by John Arthur Phillips, F.R.S., the well-known metallurgist, has long been out of print and very scarce, and many new discoveries and inventions have since been made. Gold- mining too has taken a great start of late, many millions of fresh capital having found employment in this sphere. Hence there would appear to be ample room for aii exhaustive book on the subject. How far the present work may fulfil the required conditions must be left to the reader's judg- ment. The cordial assistance received by the author from all who had knowledge to impart will be evident from a perusal of the following pages. It remains to pay a tribute of hearty thanks to the many kind con- tributors mentioned in the following list, from whose labours the book derives whatever val-.r. it may have. A. B. Ainsworth, C.E., Alexandra, Victoria, for geological and other information relating to his district. J. Allen, Warden in Marlborough district. New Zealand, for numerous photographs illustrating the operations adopted in his district (Fig. 46 and Frontispiece, pp. 884-7), and for much detailed informa- tion. Appleby Brothers, Engineers, London, for drawings of machinery. George Ashcroft, Railway Manager, Wellington, New Zealand, for account of his patent gold-saving machine. Melville Atwood, M.E., F.G.S., San Francisco, California, for various papers by him. Bailey, Wilson, & Co., London, for information about certain American appliances for gold. H. H. Barton, Mabel Pyrites Works, Ravenswood, for details of his process, and general information and drawings. Rivett Henry Bland, F.G.S., Manager of the Port Phillip and Colonial G. M. Co.'s works at Clunes, for most diffuse information concerning the methods adopted under his management, the success of which places his works second to none in the world. S. A. Brunning, Agent-General's Department for Victoria, London, for loan of various books, papers, and reports relative to that colony. Thomas Buckland, Charters Towers, Queensland, for information con- cerning his district, and for drawings forwarded by the Langlands Foundry Co., Melbourne. The Hon. Horatio C. Burchard, Director-General of the United States Mint, Washington, for the annual Reports of his Bureau. E. H. Carew, Warden in the Otago district, New Zealand, for account of machinery used in his district. i INTRODUCTION. vn C. W. Chapman, United Pyrites Co., Sandhurst, Victoria, for an account with drawing's of their method of working IMattncr's chlorination process, and other information. John Coles, F.R.A.S., F.R.G.S., Map Curator Royal Gcofrraphical Society, withi. ,t whose cheerfully rendered assistance in all matters of exact geography it would have been impossible to compile the maps illustrating this volume. The Directors of Columbia College, New York, for the ' School of Mines Quarterly.' Thomas Couchman, Secretary for Mines and Water Supply, Melbournr, Victoria, for official map of Victoria, Reports of Progress, and numerous valuable Reports. W. G. Dallas, F.L.S., Assistant-Secretary of the Geological Society, for the kind and hearty assistance he always so willingly rendered. Chevalier Dalla Vidova, Secretary-General ' Societa Geografica Italiana,' Rome, Italy, for informal ir . regarding, and map of, the gold-mines of that country. Phillip Davies, 135, Pitt St., S>dney, N.S.W., for description of curious quartz veins, and sketches by De Lacy Richards, R.N. (Fig. 99, p. 945). G. F. Deetken, Auburn, Placer Co., California, for references to works. Charles S. Dicken, Secretary Queensland Government Office, London, formerly Gold-Fields Warden and P. M. at Ravenswood, &c., for loan of papers, and introductions to several persons in the colony. F. Elwyn, Deputy Provincial Secretary of British Columbia, Victoria B.C., for map of that colony showing gold-fields, and reports on them. Martin Ferreiro, General Secretary ' Sociedad Geografica,' Madrid, Spain, for very valuable books on, and map showing, the gold deposits of that country. Edwin Field, Manager Costerfield Gold Mining Co., Victoria, for answers to circrular questions and for sketch of special apparatus. George J. Firmin, The Wildemesse, Norristown, Pennsylvania, for information relating to the United States. Montague J. M. Flint, F.R.G.S., Gunncrsbury, for map showing gold deposits of Dutch Guiana, Joseph Flude, Superintendent of Laboratories, School of Mines, Ballarat, Victoria, for account of pyrites-furnace (p. iii 3). Dr. Clement Le Neve Foster, B.A., F.G.S., H.M. Inspector of Mines in N. Wales, for cordial assistance and advice, most materially con- tributing to the value of the work. The Hon. Malcolm Fraser, Surveyor-General Western Australia, for map of that colony, and account of the gold discovered. ill vni INTRODUCTION. *ll il 11 I u Thomas Gibb, F.C.S., A.R.S.M., of the Grange Metal Extracting Works, J arrow-on Tyne, for information relating to separating methods used on the Tyne. Kdwin Gilpin, Jun., A.M., F.G.S., Inspector of Mines, Halifax, Nova Sccua, for important information respecting the geology, and re- duction processes, of his State, and for drawing of contorted vein (Fig. 1 19, p. 997). Golden State and Miners' Iron Works, 237 to 251, First St., San Francisco, for a sheet of drawings of machinery. Francisco Vidal y Gormaz, State Hydrographer, Santiago, Chili, for the trouble taken by him in procuring official maps and information respecting Chili. Grafton & Avigdor, Great George St., for papers relative to gold-mines in Canada. Frank Guinness, Warden and P. M., CollingAvood gold-fields. Nelson, N.Z., for geological and other information relating to his district. J. D. Hague, of the United States Geological Survey, for information respecting the gold industry of the U. S. E. Hahn, Hamburg, Germany, for the loan of papers relative to the El Callao mine (p. 267). Prof. Henry G. Hanks, F.R.M.S,, State Mineralogist, San Francisco, California, for papers on occurrence of gold in California. Edward Harrison, Warden of Grant district, Victoria, for information about his district. Dr. F. V. Hayden, Hon. Cor. F.R.G.S., United States Geological Survey, Washington. Dr. James Hector, C.M.G. F.R.S., Director of the Geological Survey, Wellington, New Zealand, for his liberal and valuable present of books and reports which were otherwise unprocurable. Henry F. Holt, Secretary Royal Asiatic Society, for article about gold in China. Major Jed. Hotchkiss, Staunton, Virginia, U. S. America, for information regarding his State. A. W. Howitt, F.G.S., Warden and P. M. Sale gold-field, Gippsland, Victoria, for reports and papers respecting his district. James Irvine, F.R.G.S., Liverpool, for information on the West Coast of Africa. Robert L. Jack, F.R.G.S., F.G.S., Director of the Geological Survey, Brisbane, Queensland, for map of the colony showing the gold-fields, and for various reports concerning its geology, &c. James Jackson, F.R.G.S., Archivistc-Bibliothecaire de la Societe de Geographie, Paris, for French literature on the subject of gold in France. INTRODUCTION. IX J. Jewell, M.E., M.M.S., Manager of the Aruba Island gold-mines, for descriptions of long-torn and torpedo used in Dutch Guiana. W. Rupert Jones, Librarian Geological Society, for assistance when referring to books in his library. Prof. Judd, F.R.S., F.G.S., School of Mines, for his pamphlet on the Schemnitz district. The Kapanga (New Zealand) Gold Mining Company, Limited, for answers to circular of questions. Walter Kennaway, Secretary to Agent-General's Department for New Zealand, for loan of vrrious reports and papers on that colony. Knight & Co., Sutter Creek, for drawings of machinery. New Koh-i-Noor Quartz Mining Company,Ballarat, Victoria, for descrip- tion and drawings of their reduction works, in answer to circular of questions. H. Thomas Lock, Photographer, New Zealand, for some very fine photo- graphs of gold mining, and gold-saving appliances used in that colony. John Lynch, Mining Surveyor, Smythesdale, Victoria, for information respecting his district. Malter, Lind, & Co., 189, Broadway, New York, and 419, California St., San Francisco, for descriptions and illustrations of gold-milling appliances. William Martineau, M.I.C.E., for drawing of stamp suited to mule power. Clements R. Markham, C.B., F.R.S., Secretary R. Geogr. Soc.,for informa- tion about gold in Peru. Farnham Maxwell-Lyte, F.C.S., F.I.C., for his pamphlet on metallurgical processes. C. W. Minchin, for information respecting Bolivia, and for map showing its gold deposits. Morey and Sperry, 145, Broadway, New York, for descriptions, drawings, and electrotypes of machinery. Alexander Murray, Surveyor-General of Newfoundland, for his paper on that colony. Reginald A. F. Murray, F.G.S., Geological Survey, Melbourne, Victoria, for information regarding the geology of that colony. Thomas W. Newton, F. R. Hist. Soc, Librarian School of Mines, for assistance when referring to books at his library. E. O'Malley, Clarence Cottage, Grey Street East, Melbourne, Victoria, for details concerning his process. Sir Archibald Michie, late Agent-General for Victoria, for information regarding gold in that colony. INTRODUCTION. i l< :. John Patterson, 9, Inverness Terrace, Kensington Gardens, for information concerning his pneumatic stamps (p. 1023), and many other useful statements. Mariano Felipe Paz Soldan, Hon- Cor. F.R.G.S., Lima, Peru, for exhaustive information respecting that country. John R. Perry, M. A., Exeter College, Oxford, for drawing of his hydraulic gravel-elevator (p. 990). Captain Bedford C. T. Pirn, R.N., F.R.G.S., for information respecting Central America. The Chairman, Secretary and Manager of the Placerville Gold Quartz Co., for drawings of their apparatus, and replies to questions. E. H. Plant, Charters Towers, Queensland, for full information regarding the geology of, and the appliances in use in, his district. Pleasant Creek Cross Reef Quartz Mining Company (Stawell, Victoria), for answers to circular of questions. Dr. Thomas Pollard, State Commissioner of Agriculture, Richmond, Virginia, U. S. America, for information regarding that State. , \ Old Broad St., City, for loan of valuable reports and r- r\ -n I papers respecting gold in the U. S. of Colombia. Ed. Probert, Director in Nevada of the Richmond Mining Company, for information respecting the process adopted by that Company. Queen's Birthday Company, Dunolly, Victoria, for answers to circular of questions. Henry H. E. Ralfe, Receiver of Gold Revenue, New Zealand, for descrip- tion and sketch of sluicing box used in sea-beach claims (p. 893). William Rasche, 55, Elizabeth St., Melbourne, for details of his direct- acting battery. Prof Rossiter W. Raymond, United States Commissioner of Mining Statistics, for replies to numerous questions relating to the American gold-industry. W. H. Revcll, Warden in Marlborough district. New Zealand, for drawings and description of method of working sea-beach claims in New Zealand, and of the gold-saving tables in creeks (p. 904). H. W. Robinson, Warden in Otago district. New Zealand, for drawings and description of covered tail-races (p. 879). Henry Rosales, F.G.S., long Manager of the late Walhalla G. M. Co., Victoria, for an account of his process for pyrites (pp. 11 19-25), and for many suggestions and facts. George Rouch, M.E., for translations of Spanish documents, and notes on Spanish gold weights. INTRODUCTION. XI F. W. Rudler, F.G.S., M.A.I., School of Mines, for his readiness to give information and assistance whenever applied to. Edward Caldwell Rye, F.Z.S., M.E.S., Hon. F. Neth. Geog. Soc, Librarian Royal Geographical Society, whose extensive knowledge of books of travel was at all times placed at the author's service, and conspicuously aided him in dealing with the geographical distribution of gold, Howard Saunders, F.R.G.S., for information about gold in Peru. Adolph Schmitt-Manuerbach, Biebrich-am-Rhein, for particulars of his spiral sieve. The Hon. the Chief Secretary of South Australia, Adelaide, for map showing gold-fields in that colony and reports respecting them. The Hon. the Chief Secretary, Sydney, New South Wales, for map of that colony showing the gold. Alfre':' R. C. Selwyn, F.G.S., Director-General Geological Survey of Canada, Montreal, for numerous reports and pamphlets concerning that colony. F. A. A. Simons, for information about Africa. William Skey, Analyst to the Geological Survey of New Zealand, for copies of his very valuable papers read before scientific Societies in New Zealand, and his remarks on them. Walter A. Skidmore, U. S. Deputy Mineral Surveyor and Assayer, San Francisco, Califo/nia, for information regarding certain processes in the United States. W. H. J. Slee, Inspector of Mines, New South Wales, for names of books and papers to consult relative to that colony. Joseph V. Smedley, M.A., F.R.G.S., Chairman of the Aruba Gold Mining Co., for information regjarding Aruba, W. Indies. W. B. Smith, Paramaribo, Surinam, for map of French Guiana showing the position of its gold-fields. Ben. B. Spargo, Jun., Warden of Gibbo subdivision, for an account of operations in his district. Thos. Lett Stahlschmidt, Agent-General for British Columbia, for information respecting that colony. George W. Stuart, Montagu, Nova Scotia, for information on that colony. Frank Taylor, Sandycroft Foundry Co., Hawardcn, Chester, for drawings and descriptions of machinery. Prof. G. H. F. Ulrich, F.G.S., Consulting Mining Geologist and F.ngineer, late Senior Field-Geologist to the Geological Survey of Victoria, for papers, letters, and other valuable contributions too numerous to detail. Robert B. White, Manager Frontino and Bolivia Gold Mining Co., Limited, for pamphlet on gold in U. S. of Colombia. xii INTRODUCTION. J. D. Whitney, Hon. Cor, F.R.G.S., State Geologist U. S. of America, for valuable information respecting the geology of gold in that country. C. S. Wilkinson, F.G.S., Geological Surveyor in charge, Sydney, New South Wales, for various papers and pamphlets giving information regarding his colony. John Widdccombe, Director Aruba Agency Company, Limited, for loan of books and papers. J. Brooks Wright, Glasgow, for the loan of papers respecting gold in India. Samuel Yardley, Secretary New South Wales Government Agency, for Harcus' ' South Australia,' and the loan of numerous Government Reports and papers on the Colonies of Australia. Lt.- General E. Wray, Woolwich, for reports of African Gold Coast Company, Limited. J. M. Ziegler, Hon. Cor. F.R.G.S., Bdle, Switzerland, for information respecting that country. Where all have been so liberal with help, it may seem somewhat invidious to particularize, but special acknowledgment is due to E. Delmar Morgan, F.R.G.S., Dr. Foster, Prof. Ulrich, Dr. Hector, and Messrs. Allen, Bland, Coles, Couchman, Gilpin, Rosales, Rye, and Selwyn. Finally, the tedious labour of editing the work and seeing it through the press devolved upon my son, Charles G. Warnford Lock, who came to the task fresh from editing Messrs. Spon's new Encyclopaedia of Manufactures and Raw Materials, and whose knowledge of languages, and experience of mining in Hungary, Turkey, and Iceland, were of great assistance. ALFRED G. LOCK. Merton Lodge, Cowley Road, Brixton. November 9, 1882. SYNOPSIS OF CONTENTS. CHAPTER I. Geographical Distribution, pp. i to 745. In this chapter the world is divided into 6 sections, each illustrated by a map, and the sections are again separated into countries, as indicated on pp. 1-2. In describing, in turn, every country which produces or has produced gold, or is known to possess gold-bearing rocks, attention is given to the exact localities where the metal or rocks exist, to the general geological features of each field, to the characters of the ores, to the native methods employed for extracting the gold, to ancient and modern statistics of the yield, to the laws and regulations affecting the industry, to the cost of necessaries and rate of wages, to the labour question and the climate, to traditions indicating past or hidden sources of wealth, and, in short, to every point which seems to throw any light upon the subject. CHAPTER H. Geological Occurrence and Mineralogical Association, pp. 746 to 845. This chapter embraces three separate subjects : — (i) A summary of the theories advanced during the last 20 years to account for the origin and formation of gold in veins and alluvial deposits, and for the occurrence of nuggets ; (2) a systematic epitome of the geological formations in which gold has been found, showing its very wide dis- tribution in strata of almost all ages ; (3) a catalogue of the metallic and other minerals associated with gold and auriferous rocks, with remarks upon the manner in which the ores are affected by them. CHAPTER HI. Shallow Placers and Live Rivers, pp. 846 to 907. Definition, importance, formation, decline, characters, sections of strata, favourable and unfavourable conditions, influence of bed-rock, object in placer-mining ; principle of gold-washing, pans and r-^nning, removing iron-sand, batea, horn spoon, cradle or rocker, Burke rocker, toms, „,uiccs, box-sluices, false bottoms and riffles ; block and zigzag riffles, Howland's riffle ; amalgamation, copper plates ; cleaning up, multiple XIV SYNOPSIS OF CONTENTS. sluices, under-current sluice, Evans and Frey's sluice, ground-sluice ; working results ; puddling-niachines ; whips and whims ; draining the workings, Californian pump, Chinese pump, syphons ; modes of working alluvial deposits : stripping, working by shafts and drives, paddocks and paddocking, working reef-washes, sluicing, covered tail-races ; dry washing ; river-mining : lifting rivers, dredging ; beach-mining ; flume for transporting timber ; cost of alluvial mining ; cement, its occurrence, stamping, Drake's cement-mill. Cox's pan. yields ; saving fine, flour- and float-gold, — water, copper plates, McDougall's plan, Sublett's plan, flycatching; yields of shallow placers. CHAPTER IV. i! Deep Leads or Dead Rivers, pp. 908 to 949. Definition ; formation ; sections of strata, showing leads of Miocene, Upper Pliocene, Middle Pliocene, and Lower Pliocene ages, some covered by one or more streams of basaltic lava : modes of working, ventilation, apparatus ; yields. CHAPTER V. Hydraulicing, pp. 950 to 996. Origin, advantages, essential conditions, water-supply ; miners' " inch," securing water-supply, dams and reservoirs, ditches, flumes, pipes, n^rzles ; tunnels and shafts ; sluices, water consumed, erecting sluice, paving, under-currents, drops, grizzlies, general arrangement ; tail-sluices ; blasting ; conduct of operations ; working results ; losses ; seam diggings ; crushing process ; hydraulic elevators ; booming ; utilizing river- currents for sluicing ; drawbacks to hydraulicing, — destruction of agricultural land, and silting up of rivers and bays. CHAPTER VI. Auriferous Veinstuff, pp. 997 to iioi. Sections of veins. Treatment of the veinstuff : crushing; stamping, — foundations, frames, mortars or coffers, screens or gratings, dies or false bottoms, stamps, weight of stamps, height of drop, speed, order of drop, character of blow, tappets or collars, guides, cams or wipers, cam-shaft, props or studs, feeding, automatic feeders, water, tables of dimensions and duty of stamps, special forms of stamp (Dunham's, Fisher's, Patterson's, ShoU's) ; pulverizers(Howland's, Jordan's, Lucop's, Thompson's). Arresting the metal : general principles, ways of using mercury, amalgamated plates ; amalga- mating pans, — general details, Berdan's pan, Britten's pan, Chilian mill, Denny & Roberts' pan, Dickson's amalgamator, Hepburn & Peterson's pan, Horn's pan, Hungarian bowl or Tyrolese mill. Hunter's rubber, Jordan's pan, McConc's pan, Pattoii's pan, Peek's amalgamator, Rcadwin's amalgamator, Wheeler's pan, Wheeler & Randall's pan ; blanket-tables ; roasting quartz. Treatment of blanket-sand : SYNOPSIS OF CONTENTS. XV barrel-amalgamation. Treatment of tailings : definition and general piinciples : settlers; suers.-sieves, labyrinths, pyramidal boxes, triangular double troughs ; con- centration,-percussion-tables, rotating tables, buddies, Bradford's jig, Denny's concentrator. Dodge's concentrator, Frue vanner, Hendy's conccmrator, Imlay con- centrator. Complete mills : Kite Mining Co.'s, Placerville Co.'s, Port Phillip Co.'s. Rio Grande. ^ CHAPTER VII. Auriferous Ores, pp. 1102 to 1151. Definition. Composition of ores: series of assays. Association of the gold Treatment of complex ores. Antimonial ores : their characters ; Herrenschmidt's furnace, Cosmo Newbery's process for recovering the antimony, Designolle's process. Arsenical ores : their characters ; Chapman's process, Flude's furnace, Port Phillip Co.'s furnace, revolving furnaces, Rosales' process. Bismuth. Cobalt and Nickel Copper ores : characters ; Claudet's process, Henderson's process, Hollway's process, Hunt & Douglas' process, Mears' process, Monnicr's process, Paul's process, Plattners process, Washoe process. Iron-ores: characters; Denny's drop-furnace. Lead ores : characters ; Austrian process, Richmond process. Silver : separation from gold alloy. Tellurium ores : treatment. Zinc ores. Retorting amalgam. Appendix to Chapter I., pp. 1143 to 1152. Additional notes on Chili and on Peru. Bibliography, pp. 1153 to 1185. Glossary, pp. n86 to 1192. Geographical Index, pp. 1193 tc 1217. General Index, pp. 12 18 to 1229. tyi LIST OF ILLUSTRATIONS IN THE TEXT. Fig I. 2. 3- 4. S- 6. 7- 8. 9- lO. II. 12. 13- 14. IS- 16. 17- 18. 19. 20. 21. 22. 23- 24. 25. 26. 27. 28. 29. Subject. Ground-sluicing at Reefton, New Zedand Arab method of utilizing water Sketch-map of Zambesi-Lydcnburg gold-field Gold-panning in West Africa Sketch-map of British Columbian gold-fields .. Sketch-map of Nova Scotian gold-fields Mode of sluicing in S. America Sketch-map of Indian gold-fields Gold-washing at Heera Khoond Gold-washers of Singhbhum Dish and scraper used in Singhbhum Sketch-map of Yeniseisk gold-fields Sketch-map of Amur gold-fields Sketch-map of Ural gold-fields Russian gold-washing apparatus .. Agtd's gold-washing apparatus Ural gold-washing apparatus Russian gold-washing apparatus Sketch-map of Turkestan gold-fields ,. .. [[ Sketch-map of New South Wales gold-fields Sketch-map of New Zealand gold-fields (Middle Island) Sketch-map of Queensland gold-fields Sketch-map of Victorian gold-fields Hungarian gipsies washing for gold Rhine gold-washing dish " » " table .. " » >) P