None
Fairbanks, 2, 1893. , Rickard, T. A., 18, 1900. Foster, p. 12, 1900. I 8, 9, 1896. Irving, J. D., 7, 1908. , Scheerer, Erzgebirge, 1862. Jenney, 2, Reducing agents, 1902. Smith, W. 8. T.f U. S. O. S. Prof. Paper 3G, pp. Kemp. 21, pp. 42-44, 1906. • 148-149, 1905. Lindgren, 12, The relations between wall rocks Spurr and Garrey, 1, pp. 160-161, 1905. and deposition are discussed in some de- I 3, pp. 234-237, 1908 : 6, pp. 828-830, 859, 1901 : tail, 1900. ' 12. pp. 896-401, 1905. 3, p. 279, 1*14. , Van Hise, 4, pp. 88-91, 1900; 8, pp. 10«6-108*, 13, pp. 612-1)13, 1901. | 1229, 1904. Lindgren and Ransome, 3, pp. 159-160, 208-209, Weed, 6, General, 1901. 190>. INDEX. [Note. — In this Index the names of authors of papers are printed in small capitals, and the titles of papers in italics. References to papers expressly treating of the sub- ject named are likewise in italics;. and casual notices, giving but little information, are usually indicated by bracketed page numbers.] A., C. F. : silver sandstones of Utah, 324. Absorption process in contact-metamorph- ism, 579. Accident mine, Cripple Creek, Colo., [420]. Acidity in mine-waters: cause, 174. Adams, F. D. : origin of nickel-ores, 482. Age of igneous rocks : determination, 67. Agency of Manganese in the Superficial Al- teration and Secondary Enrichment of Gold- Deposits in the United States (Em- mons), xxviii, 759-828. Aguilera, J. G. : mineral deposits of Mex- ico, [367]. Aguilera and Ordofiez ; rocks of San Jose, Tamaulipas, Mexico, 565. Ajax mine, Cripple Creek, Colo., [419]. Alaska, Forty-Mile district; dike-rocks, 272. igneous rocks, 261, 262, 263. gold-production, 436. Napoleon creek placers: origin, 300. Panhandle region : geology, 583. Alaskite : urvstallization process, 609. definition,*272, 604. occurrence and composition, 273. Silver Peak, Nev., 623. Albite: crystallization from magmas, 609. in veins of Juneau district, Alaska, 588. Alfreina mine, Cananea, Mexico, [378]. Algoma district, Ontario, nickel-deposits, 463. Algonkian : Lake Superior region, 637. rocks included in, 69. Algonkian rocks; classification, 69. distribution, 69. Alkaline earths: in mine-waters, 768. solutions: solvent capacity, 30. Allen, E. T. : composition of gravel at Steamboat Springs, Nevada, 631. Alhtropism of Gold (Louis), xv, 105-109. Alteration: agents, 113. antimony-deposits, 134. bismuth-deposits. 134. copper-deposits, 128-131. Arizona: climatic effect, 129. process, 129. depth of, 118. factors controlling, 120. gold-deposits, 132-133. in fissure-veins, 532. lead-deposits, 131. manganese-deposits, 127. mercury -de posits, 134. method and chemical effects, 113. molybdenum-deposits, 135. physical effects, 116. Alteration : silver-deposits, 131. Silver Cliff, Colo., 155. sulphides to oxides, carbonates, and chlorides, 2. superficial ; ore-deposits, xv. tin-deposits, 133-134. varying depths from surface, 121. wall-rooks, Tonopah, Nev., 595. zinc-deposits, 131-132. Alteration-products: classifleation, 123. technical names, 112. Alumina: in mine- waters, 768. quantity in igneous rocks, 732. Amalgamation : gold, 107. Analyses ; analcite-tinguaite, 566. basalt, 567. camptonite, 566. deep water from Geyser mine, Silver Cliff, Colo, 152. diorite-porphyry, 564. eruptive rocks, 705. gabbro, 563. limestone, 568. mine- timbers, 180. minerals isolated from rocks of New Zealand, 167. nephelite-syenite, 562. nickel-bearing mineral, 472, 473. non-magnetic residue from pyrrhotites, 472. ore from Gevser mine, Silver Cliff, Colo., 147. radioactive water, 709. sinter, 629. sinters from Geyser mine, Silver Cliff, Colo , 149. spring waters, 706. vadose country-rock : Ballarat gold- field, Victoria, 187. Lake Wakatipu, N. Z., 189. Ohiuemuri district, N. Z,, 190. Otago, N. Z., 188. Walhalla gold-field, Victoria, 186. vadose water from Geyser mine, Silver Cliff, Colo.. 151. volcanic gas, 388. water, 152, 630. wood for gold, 198. Anchoria-Leland mine, Cripple Creek, Colo., [420]. Andesite : Tonopah, Nev., 591. Andradite : San Jose, Tamaulipas, Mexico. 572. Animikie iron-range: Lake Superior re- gion, 651. Annie Laurie gold-mine, Utah, [827]. 930 INDEX. AnthoD, E. F. : affinity of metals for sul- phur, ili. Anthracite, graphitic: association with silver-lead ores, 317. Antimony : in silver-ore, Silver Cliff, Colo., 141, 147. reducing power, 353, 358. relations to igneous rocks, 754. Antimony-deposits: alteration, 134. Apatite : in magnetite : Kiirunavaara, 677. Apollo gold-mine, Unga Island: gold- production, 440. Apparatus for examining mine-waters,180. Aqueous solutions : ore-deposition, 29. Archean : Lake Superior region, 637. rocks included in, 68. Silver Cliff, Colo., 139, 145. Areal distribution of mining-districts, 325. Argall, Philip : origin of Sudbury nickel- ores, 483. Arid regions: alteration of ore-deposits, 136. Arizona : Clifton copper-deposits, 401, 517- 556. gold-production, 440. Arsenic : reducing power, 353, 358. relations to igneous rocks, 754. Arse nopy rite : in contact-metamorphic de- posits of Sacrificio mountain, Durango, Mex., 402. reducing power, 353, 358. Arsenopyrite type of ore-deposits, 372. Ascending meteoric waters : cause, 242. Ascension-theory of ore-deposition, xiii, | 12, 14, 15, 201. ( objections to, 160. Ash burner, C. A. : charcoal in anthracite, ■ 319. ' Assays : for determination of fineness of gold, 182. , for gold in California rocks, 301. marine sediments, 197. silver, [17]. Sudbury, Ontario, ores, 464. ' vadose and deep vein-gold, 184. | methods, 185. Atacumite: occurrence at Jerome, Ariz., ! 136. i Augite: separation from hornblende, 166. Auric compounds : formation, 107. Auriferous lodes; origin, 201. i A ury lie compounds: formation, 107. Austin, W. L. : Discussion on Ore-Deposits \ nrar Igneous Contacts, 396-402. Dhcussion on The Geological Features of \ the Gold- Production of North America, 447-449. ! contortion in wollastonite, 577. j Austin district, Nevada, ore-deposits, 617. ! I Backstrom ; genesis of iron-ores of Norr- ' botten, Sweden, 678. | Ball, Spurr, and Garrey: silver-lead de- posits, Georgetown and Silver Plume, Colo., [816]. Ball Mountain fault, Leadville, Colo., 48. Ballarat gold-field, Victoria: vadose coun- try-rock : analyses, 187. Bancroft, G. J. : The Formation and En- richment of Ore-Bearing Veins, xxvii, 696- 719; Supplementary Paper, 720-728. Banded structure in ore-bearing rock : ori- gin, 56. Banuack, Mont., gold -deposits, 381. Baraboo iron-range, Wisconsin : origin of ores, 651, 652. Baric chloride : precipitant for gold, 194. Barite: distribution in Missouri, 89. Barite-deposits : Virginia, 834. Barium : distribution in igneous rocks, 748. quantity in igneous rocks, 733. Barlow, A. E, ; geology of Sudbury, Onta- rio, nickel-deposits, 479. Barrell, Joseph : contact-effects in Elk horn district, 576. contact-metamorphism, 374, 392, 524. physical effects, 385. rocks of Elkhorn district : composition, 383. Barns, Carl : compression of water, 244. Barysphere : metals in, 714. Baryta: tests for: in rocks at Leadville, Colo., 16-17. Basalt: San Jose, Tamaulipas, Mexico, 567. Basaltic rocks: Cripple Creek district, Colo., 411. Bassick mine, Silver Cliff district.Colo.,158. example of chimney-deposits, 58, 59. locus of ore-bodies, 24. Batkson, C. E. W. : The Mojave Mining- District, California [Trans., xxxvii, 160- 177], Notice, 832. Batesville, Ark. : manganese-deposits : concentration, 128. Bauxite : origin, 135. Bayley, W. S. : absorption-phenomena at Pigeon Bay, Minn., 579. Beck, Richard : gold-bearing granite, 367. nickel-ores, origin, 486. ore-deposits, [218]. genesis, [25-3]. Be rggiessh iibel, 378. Becker, G. F. : Biographical Notice of Samuel Franklin Emmons, xxix-xlvii. The Torsional Theory of Joints, xiii, 92- 104: Discussion (Howe), 101: (Ray- mond), 101-102; (Becker). 103, 104; (Boyd), 103. Discussion on The Genesis of Certain Au- riferous Lodes, 207-208. bitumen associated with quicksilver, 345. Comstock lode, 60. production, 803. quartz, 801. replacement, xl. source of ore- materials, [164]. Comstock rocks, erosion, 85. convection currents in magmas, 260. deposition of sulphides by hot ascend- ing waters, 629. in vestigations of country -rocks, Washoe, 23. " linked veins," 221. minerals in Appalachian gold-deposits, 809. natural solvents of precious metals, xiv, [203]. osmosis in ore-formation, [xxiv]. quicksilver-deposits, [207]. genesis, 79. vein-formation at Clear Lake, Cal., and Steamboat Springs, Nev., xiv. INDEX. 981 " Bedded vein " : definition, 36. Bedding: agency in producing water- channels, 33. Bell, Robert : origin of nickeliferous pyr- rhotite, 481. Belmont district, Nevada : ore-deposits,617. Ben Eaton mine, Silver Cliff region, Colo., 157. Bendigo gold-field, Victoria : assays, 185. Beresite at Belmont, Nevada, 278. Berggiesshubel, Saxony, ore-deposits, 378. Bebkby, C. P., and Hastings, J. B. : The Geology and Petrography of the Goldfield Mining- District, Nevada [Trans., xxxvi i, 140-159], Notice, 832. Berner's Bay, Alaska : gold-deposits, 811. Beryllium: distribution in igneous rocks, 746. Bibliography: Science of Ore-Deposits, ( Irving, Smith, Ferguson), 837-928. Scientific Publications of 8. F. Emmons, xlii-xlvii. Bibra: metals in ashes of marine plants, [256]. Big Seven mine, Neihart, Mont., 220. Bischof, G. : derivation of vein-materials, 22. metals in water of springs, [708]. ores in sedimentary rocks, 256. transformation of potassium feldspar to albite, 587. Bisilicates : metal-content, 203-204. Bismuth : relations to igneous rocks, 754. 'Bismuth -deposits : alteration, 134. Bispberg mine, Sweden: origin of iron- ores, 670. Bitumen : association with ore-deposits, 345. reducing power, 305, 350, 357. Bituminous coal : reducing power, 351, 357. Bituminous shales : association with ore- deposits, 327. Black Hills, S. Dak. : fissures conducting ore-bearing solutions, 700. gold-deposits, 810. Blair mines, Silver Peak quadrangle, Ne- vada, 621, 622, 624. Blake, W. P. : Discussion on The Genesis of Certain Auriferous Lodes, 211-212. petroleum associated with zinc- and lead-ores, 344. Blende : deposition from mine- waters, 330. mode of occurrence in Missouri, 327. reducing power, 358. Blezard (Dominion) mine, Blezard town- ship, Sudbury district, Ontario, 499. Block 8 of State land mine, Cripple Creek, Colo., 42?.. Blue limestone, Leadville, Colo.: geologic horizon, 18. ore-bodies in, 7, 13. receptacle of ore-materials, 7, 16. Bluebird granite, 223, 224. Bodie, Cal. : gold-deposits, 823.. Boemmkr, Max: Some Practical Sugges- tions Concerning the Genesis of Ore-De- posits [Trans., xxxiv, 449-453], Notice, 829-830. Bog iron-deposits : Gunnison region, Colo., 32. Bed mountain, Colo., 32. Bog-ore: Scandinavia, 694. Boiler-scale: examination for gold, 178- 179. Bonanzas: occurrence, 453. Borax -deposits: formation, 115. United States (Keyes), 835. Bornite : reducing power, 358. Boron : distribution in igneous rocks, 743. Boundary district, B. C. : copper-deposits, 374. Boutwell, J. M. : Genesis of the Ore-De- posits at Bingham, Utah [Trans., xxxvi, 541-580], Notice, 831. Boyd, C. R. : Discussion on The Torsional Theory of Joints, 103. Breccia : in fissures, 45. in fissure- veins: origin, 46. Silver Cliff, Colo., 143. Brecciation in country-rock : effect on ore- deposits, 118. Breithaupt : derivation of vein-materials, 22. British Columbia : Boundary district : cop- per-deposits, 374. gold -production, 436. Rossland : pyrrhotite-deposits, 462, 486. British Guiana : gold-quaTtz veins, 281. Brock, R. W.: copper-deposits of Boun- dary district, 375. pyrrhotite-deposits, Bossland, B. C, 486. Brogger, W. C. : contact-metamorphic phe- nomena, 525. igneous rocks of Christian ia region, 692. origin of igneous rocks, [260]. Brokaw, A. D. : experiments on solution of gold, 763, 773, 776. Bromine : solvent of gold, 173. Brown, R. G. : The Vein System of the Stan- dard Mine, Bodie, Cal. [Trans., xxxvi ii, 343-357], Notice, 833. Browne, D. H. : magnetic separation of nickel-ores, 467. nickel -ores of Sudbury, 470, 483. Browne, Ross £. : association of gold with slate in California, 211. Brun, Albert: experiments on lavas, 725. gases in lavas, [767]. Buehler and Gottschalk; role of pyrite, 766. Bull-Domingo mine, Silver Cliff district, Colo., 24, 58, 158. Bullfrog, Nev. : geology and ore-deposits, 600. i gold-deposits. 827. ' Bullion-Beck mine, Tintic district, Utah, 335, 336. I Bunsen, R. : volcanic gases, 723. Burns mine, Cripple Creek, Colo., 422. Bush, E. R.: origin of Sudbury nickel- ores, 483. Butte, Mont. : copper-deposits: alteration, 130. genesis, 76. vein-formation. 55, 220. Butte granite, 223, 224. Cable mine, Philipsburg quadrangle, Mont., [762], 814. character of gold-enrichment, 762. Cadmium : distribution in igneous rocks, 753. 932 INDEX. Calcium : in mine-waters, 768. Calcium di sulphide : reducing power, 358. California : assays for gold, 301. gold production, 436. California metal log raphic province, 619. California region : geologic history, 583. Cambrian: Silver Peak quadrangle, Ne- vada, 604. Camp Bird gold-mine, Ouray, Colo., [787], [818]. Camptonite: San Jose, Ta maul i pas, Mex- ico, 566. Cananea, Sonora, Mex. : copper-deposits, 376, 396. volcanic action, 715. Cananea mountains: physiographic fea- tures, 376. Carbon : mode of occurrence, 315. protective action, 311. reducing action, 305. reducing power, 307. Carbon dioxide: occurrence in New Al- maden quicksilver mine, 363. role in formation of ore-deposits, 312. Carbon monoxide: reducing power, 358. Carbonaceous matter: influence on forma- tion of ore, 231. Carbonate fault, Leadville, Colo., 48. Carbonate Queen mine, Cripple Creek, Colo., 419. Carbonates: in mine-waters, 768. Carbonic acid gas : in subterranean water : Silver Cliff, Colo., 148. r61e in formation of ore-deposits, 312. stability, 313. Carboniferous rocks : relation to Cambrian country-rock in Ozark region, Mo., 88. Carlyle, W. A. : gold-quartz veins in Slo- can district, B. C, 2H0. Cam Marth, Cornwall : banded ore-depos- its, 57. Catalytic action : definition, 309. Caves: formation by solution, 6. Leadville, Colo. : formation subsequent to ore-d epos its, 4. receptacles for ore-bodies, 7-8. Cavities: ore-deposition in, 87. Cazin, F. M. F. : origin of copper- and sil- ver-ores in Triassic sand-rock, [326]. Cerium : distribution in igneous rocks, 749. Chalcocite: chemical relations with py- rite, 798. in dioritc, 90. oxidation, 534. reducing power, 358. Chalcocitization : vertical relation 'to deep- seated enrichment of gold, 798. Chalcopyrite : formation, 310. in Geyser mine, Silver Cliff. Colo., 146. reducing power, 358. relation to pyrrhotite, 513. San Jose, Tamaulipas, Mexico, 574. Chalcopyrite type of ore-deposits, 372. Chamberlin and Salisbury: gases in vol- canic emanations, 7*23. specific gravity of earth, 715. Chamberlin, R. T. : gases in rocks, [767]. Chamberlin, T. C. : succession of ores in lead- and zinc-deposits of Wisconsin, [407]. Chance, H. M. : coal carrying gold, 321. Channels: conducting ore-bearing solu- tions, 700. for circulating waters in earth's crust, 30. in rock -masses : closing of, 699. Chapeau de fer (gossan) : definition, 112. Character and Genesis of Certain Contact- Deposits [Lindgren], xix. Charcoal in Geyser shaft, Silver Cliff, Colo., 143. native : deoxidizing agency, 319. Charters Towers, Queensland : rocks, 163. Chemical changes (rocks and ore-depos- its) : see Alterations. Chemical composition of beds : factor in ore-deposition, 36. Chemical forces: rdle in solution and de- position, 30. Chemistry of Ore-Deposition (Jenney), xxii, 305-363; Discussion (Church), 359-363. Cherokee limestone, Missouri: character and composition, 334. Chile : copper-deposits, 130. Chimney-deposits: definition, 58. examples, 58. China : gold-quartz veins, 282. Chloride ores: distribution, [768]. occurrence, 136. Chlorides: copper: effect in solution of gold, 77:*, 781. in mine- waters, 766. Chlorine: agency in transportation of metals, 722. amount necessary for solution of gold in presence of manganese compounds, 784. distribution, 767. in igneous rocks, 751. in mine- waters. 766, 779. in natural waters : map, New England and New York, 769. in volcanic emanations, 723. nascent : agency iu solution of gold, 777. quantity in igneous rocks, 734. solvent of gold, 174. with manganese compounds : solubility of gold in, 784. Christiania region. Norway: igneous rocks : classification, 692. Christmas mine, Cripple Creek, Colo., 422. Christy, S. B. : bitumen associated with quicksilver, 345. Chromium : distribution in igneous rocks, 750. iu basic rocks, 285. in igneous rocks, 267. quantity in igneous rocks, 733. Church, John A. : Discussion on Geolog- ical Distribution of Useful Metals in the United States. 83-86. Discussion on The Chemistry of Ore-Depo- sition, 359-363. deposition of ores in limestone, 341. Circulation : meteoric waters. 242, 243. ore-bearing solutions: factors control- ling, 791. Clarke, F. W. : average composition of ig- neous rocks, [7341. chlorine-content of igneous rocks, [767]. INDEX. 933 Clarke, F. W. : formula of vesuvianite, [572]. manganese in igneous rocks, [794]. reactions produced by hot waters, [726]. relative proportion of elemeuts in earth's crust, [293], rock-analyses, [767], [794]. Classification : Algonkian rocks, 69. genetic : Ciifton-Morenci ore-deposits, 556. ore-deposits, 286, 366. products of alteration, 123. rock -fractures, 40. Cleavage-planes: cause, 41. definition, 101. Clerc, F. L. : The Ore-Deposits of the Jop- lin Region, Missouri [Trans., xxxviii, 320-343], Notice, 83S-834.. Ciifton-Morenci district, Arizona : depth of oxidized zone, 545. distribution of ores, 540. fluid inclusions, 545. genesis of ores, 551. genetic classification of deposits, 556. geology, 519. groundwater conditions, 544. Climatic conditions : effect on alteration, 120. Coal, bituminous: association with ore- deposits, 320. Coast-sediments: examination for gold, 196. Cobalt: in igneous rocks, 269, 752. in Sudbury pyrrhotites, 466. presence in pyrrbotite, 461. quantity in igneous rocks, 733. Colorado: Cripple Creek district: ore-de- posits, 411. gold-production, 437, 441. pre-Mesozoic gold-deposits, 447. relation of rain-fall, run off, and evapo- ration, 698. Kico : mineral veins, 226. San Juan region : vein-system, 290. Colorados (gossan) : definition, 112. Comagmatic region : definition, 738. Comb-structure: veins, 10. Compression-fissures: Butte, Mont., 55. Compression -fractures : characteristics, 45. Compression-joints : definition, 41, 50. Comstock, T. B. : genesis of Red Mountain deposits, 31. The Geology and Vein -Structure of Southwestern Colorado, [31]. vein-system of San Juan region, Colo., 290. Comstock district : comparison with Tono- pah, Nev., 601. Comstock lode, Nevada : genesis of ores, ix, x, 19, 85, 803. gold-production, 440. production of silver and gold, and rela- tion of ores, 801, 802. structural features, 60. Comstock vein : extent, 11. structure, 10. Concentration : gold : in oxidized zone,797. iro#-deposits : Lake Superior, 125. natural : minerals, 255. ore-raetals, 300. Concentration -process: ore-deposits, 29. Consanguinity : in rocks, 738. Contact-deposits : character and genesis, xix. examples, 38. formation, 230. miners' use of term, 37. Contact-metamorphic deposits, 432. distribution, 396. genesis, 387, 392. geographic distribution, 373. Contact-metamorphic effects : variability, 578. Contact-metamorphic ore-deposits : char- acter, 371. Contact-metamorphic zones, 371. Contact-metamorphism : Bannack, Mont., 382. Ciifton-Morenci district, Arizona, 522. effects, 385. Elkhorn district, Montana, 576. hydrothermal, 529. origin, 262. San Jose, Tamaulipas, Mexico, 567. western Nevada, 617. Contact- planes : definition, 37. Contour-mapping: introduction, xxxii. Contraction hypothesis, 42. Con traction -planes : origin and extent, 35. relation to ore-deposition, 35. Copper : deposition from sea-water, 258. distribution in igneous rocks, 752. in basic rocks, 285. in igneous rocks, 270. in mine-waters, 770, 781. in nature : detection, 77. quantity in igneous rocks, 733. reducing power, 358. Copper chlorides: effect on solubility of gold, 773, 781. / Copper Cliff mine, Sudbury, Ontario, 456. 501. photomicrographs of ore, 489, 494. Copper-deposits: alteration, 114, 128-131. Appalachians : genesis, 76. Arizona : Bisbee, 829. Clifton, 401. Ciifton-Morenci (Lindgren),xxv, 517- 556. classification, 521. climatic effects, 122. Jerome, 136. superficial alteration, 128. Australia: Chillagoe district, North Queensland, 830. Cananea type, 374. Chile, 130. climatic effects, 122. Colorado : Evergreen, 835. concentration, 76. genesis, 75-77. Idaho : Mackay, 833. kind of rock in which found, 77. Lake Superior district, 76. Mansfeld, Harz mountains, 36. Mexico : Cananea, 396. Michigan : climatic effects, 121. Montana : Butte City : alteration, 130. genesis, 76. San Jose, Tamaulipas, Mexico (Kemp), xxv-xxvi, 557-581. source of material, 75. 934 INDEX. Copper-deposits: Tasmania: climatic ef- fects, 122. Tennessee : Ducktown : alteration, 130. Copper-iron sulphides : secondary enrich- ment, 832. Copper- veins : Butte, Mont., 224, 225, 403. Virgilina, Va., 220. Coriolanus mine, Cripple Creek, Colo., 419. Cornwall, England : veins : structure, 10, 225. Coronadite, Clifton-Morenci district, Ari- zona, 519. Coronado lode,. Clifton-Morenci district, Arizona, 543. Coronado quartzite, Clifton-Morenci dis- trict, Arizona, 519. Correlation of the elements, 743. Correlation table : pre-Cambrian series of the Lake Superior region, 634. Cotta, B. : derivation of vein-materials, 22. Treatise on Ore- Deposits, [viii], 316. Country-rock : auriferous lodes : examina- tion, 183. Colorado : Custer county : assays for sil- ver, 161. Lead vi lie : investigations, 23. Silver Cliff: assays for silver, 161. investigations, 23.. Ten-Mile : investigations, 23. Influence on Mineral Veins (Weed), 216- 234. influence on vein-filling, 222, 223. Nevada : Washoe : investigations, 23. New Zealand : classes, 212. of ore-deposits: decay, 117. sheeting, 46, 47. vadose region of Walhalla gold-field, Victoria, 186. Covellite : reducing power, 358. Cracks : in glass : produced by torsional strain, 51. Creighton mine, Sudbury, Ontario, 502. photomicrographs of ore, 490-492. Cretaceous gold-deposits, 435-438. Cretaceous rocks, Tamaulipas, Mezico,561. Cripple Creek and Silver Cliff ore-depos- its compared, 158. Cripple Creek district, Colorado : gold- production, 441. ore-deposits, 411, 819. rocks, 718. underground-water conditions, 699. Crosby, W. O. : Ore- Deposits of the Eastern Gold-Belt of North Carolina [Trans., xxxviii, 849-856], Notice, 834-835. origin of cross-joints, 44. torsional hypothesis, [95]. Crosby and Fuller : origin of pegmatite, 275. Cross, Whitman : absence of steam in Kilauea, 390. Democrat and Ben Eaton mines, Colo., [157]. Cross-joints : definition, 40. origin, 44. Crown Point- Belcher bonanza, 361. Crowning Glory gold-mine, Silver Peak, Nev., 621, [813]. cross-section, 625. Crushed zones : ore-deposits, 57. Crystalline rocks : see Rocks. Crystallization : in igneous rocks : order, 261, 263. in magmas : order, 585. Cupric chlorides : see Chlorides, copper. Cupric salts : efficiency in promoting solu- tion of gold, 782. Curtis, J. S. : ore-deposits of Eureka dis- trict, Nev., 7, 58. Curve : gold in vadose country-rock, Wal- halla, Victoria, 192. Custer county : country-rock : assays, 161. Dacite : Tonopah, Nev., 593. Dacite-porphyry : percentage composition, 565. Daggett, Ellsworth : The Extraordinary Faulting at the Berlin mine, Nevada [Trans., xxxviii, 297-309], Notice, 833. Dai n tree, .Richard : auriferous rocks of Queensland, 282. Dannemora mine, Sweden : diagram, 661. Dart River : auriferous lode, North Gipps- land, Victoria : assays, 184. Daubree, A.: classification of rock frac- tures, 40. experiments on glass, 51. genesis of titaniferous albite veins, 587. movement in rocks, 92, 93, 94. production of joints, 94. subterranean waters, 29. synthetic experiments, [2]. torsion experiments on glass plates, 95. Dawson, G. M. : quartz- veins associated with granite, 279. Dead Pine mine, Cripple Creek, Colo., 419. Dead wood mine, Cripple Creek, Colo., 422. Death valley : borax-deposits, [835]. Decomposition of volcanic rocks, 727. Deep mines : dryness, 241. Deformation : modes, 92. De Kalb, Courtenay: Geology of the Exposed Treasure Lode, Mojace, Cali- fornia [Trans., xxxvii, 310-319], No- tice, 834. gold-deposits of Exposed Treasure mine> Cal., 824. De la Beche: mineral veins of Corn wall,226. mineral veins of Derbyshire, 229. vein-formation, 220. Del a mar district, Idaho : comparison with Tonopah, Nev., 601. Delamar gold-mine, Nevada, [794], [828]. De Launay, L. : distribution of rare ele- ments, 745. genesis of iron-ores, 678. genesis of ore-deposits, [253]. Del Mar, Alexander : gold-resources of the world, 425. Delmonico mine, Cripple Creek, Colo., 422. Democrat mine, Silver Cliff region, Colo., 157. Depth of alteration of ore-deposits in on- glaciated regions, 122. Derby, O. A. : Brazilian gold-veins, [239]. Derbyshire lead -mines, 229. Descending solutions: agency at Lead- ville, Colo., 12. Descending waters : agency in fornAtion of iron-deposits, 69-71. Detection and Estimation of Small Quantities of Gold and Silver (Wagoneb), 829. INDEX. 935 Deville, C. St. C: juvenile waters, [xxxvii]. volcanic gases, 723. Diaclase : rocks, 92. Diaclases : definition, 40. Diamond swindle : Vermilion Creek Basin, Wyoming, [xxxiii]. I Dickson, C. W. : The Ore-Deposits of Sud- bury, Ontario, xxiv-xxv, 455-516. Differentiation : igneous magmas, 67. Dikes (see also Intrusions): Forty-Mile district, Alaska, 272. San Jose, Tamaulipas, Mexico, 565. Dillon mine, Cripple Creek, Colo., 419. Diopside : San Jose, Tamaulipas, Mexico, 570. Diorite : source of nickel-ores, 90. Diorite-porphyry : San Jose, Tamaulipas, Mexico, 563. Distribution of the Elements in Igneous Rocks (Washington), xxviii, 729-758. "Distributive" faults, 221. Doctor-Jack Pot mine, Cripple Creek, Colo., 423. Doelter : preparation of pyrrhotite, 460. Dolcoath mine, Cornwall, 225. Dolcoath mine, Montana, [383]. Dolomite : disintegration, 336. unaltered : distribution on Fryer hill, Lead vi lie, Colo., 13. Don, John R. : The Genesis of Certain Au- riferous Lodes, xvi, 162-215 ; Discus- sion (Le Conte), 202 ; ( Emmons), 202- 206; (Becker), 207-208; (Winslow), 208-211; (Blake), 211-212; (Don), 212-215. analyses of Australian mine-waters, [779J. chlorine as solvent of gold, 763. genesis of auriferous lodes, 696. method of determining gold in sea- water, 194. solution of gold, 763, 771, 773. Douglas, James: secondary enrichment, xli. Drinkwater mine, Silver Peak, Nev., 621. cross-section, 625. Dryness of deep mines, 241, 698. Duck tow li, Tenn., copper-deposits, 510. alteration, 130. Dunderland, Norway, iron-ores, 690. Dustiness of mines : explanation, 698. Duty of a reducing agent : definition, 347. Dynamic disturbance of earth's crust : periodicity, 43. Dynamic movements: effect on water- channels, 34. Eakins, L. G. : assays for silver, 161. Earthquakes: relation to rock-flowage, 712. theory, 44. Earth's axis : shifting as explanation of stress, 715. East Tennessee mine: photomicrographs of ore, 494. Edgemont, Nev., gold-deposits, 815. Edison, T. A.: magnetic separation of nick el -ores, 467. Egleston, T. : petroleum associated with quicksilver, 344. Eisener Hut (gossan) : definition, 112. Elba Island : iron-ores, 8-9. Elements : correlation, 743. distribution in igneous rocks, 754. rare : distribution, 745. Elenita mine, Cananea, Mexico, 398. Elisa mine, Cananea, Mexico, 398. Elk mountains, Gunnison county, Colo. : fissure-faulting, 49. Elkhorn district, Montana : ore-deposits, 382. Elk ton mine, Cripple Creek, Colo., 420. Ellis, H. R. : coal carrying gold, 321. Elsie mine, Snider township, Sudbury dis- trict, Ontario, 500. photomicrographs of ore, 489-490. Emma mine, Tintic district, Utah, 362. Emmens, S. H. : nickel-minerals from Sudbury, 457. Emmons, Sam tel Fbanklin: Biograph- ical Notice (Becker), xxxi-xlix. List of Scientific Publications, xliv-xlix. Introduction, vii-xxviii. The Genesis of Certain Ore-Deposits, xi, 1-25. Geological Distribution of the Useful Met- als in the United States, xii, 65-83 ; Discussion (Church), 83-86: (Win- slow), 86-89; (Emmons), 89-90; (Merritt), 90-91. Some Mines of Rosita and Silver Cliffr Colorado, xvi, 139-161. Structural Relations of Ore-DeposiU [Trans., xvi, 804], xii, 26-64. Discussion on The Genesis of Certain Au- riferous Lodes, 202-206. association of gold with manganese, [787]. chlorine in natural water, 768. copper-deposits of Boundary district, British Columbia, 374, 375. Delamar mine, Nev., 828. genesis of certain ore-deposits, [27]. genesis of Lead vi He ore-deposits, xxxvi. gold-deposits of Black Hills, [811]. increase in production of gold, 425. investigations of country-rocks, Lead- ville, 23. manganese as indication of rich ore, 787. manganiferous gold-ore, Lead vi lie, Colo., 816. manganiferous silver-ore at Leadville, Colo., 800. non-mineral-bearing fissures, Leadville, Colo., 49. origin of Sudbury nickel-ores, 486. secondary enrichment of ore-deposits, [696], [761], [811]. silver-ores of Aspen, Colo., 332. Theories of Ore-Deposition Historically Considered, [viii]. veins of Butte, Mont., 55. Emmons, S. F., and Irving, J. D. : Down- town District, xxxviii. Emmons, Irving, and Jaggar: gold-de- posits, Black Hills, S. D., [810]. Emmons, W. H. : The Agency of Manganese in the Superficial Alteration and Second- ary Enrichment of Gold- Deposits in the United States, xxviii, 759-828. gold -de posits, Edgemont, Nev., [815]. Midas, Gold Circle district, Nev., [827], 936 INDEX. Emmons, W. H., and Garrey, G. H. : gold- deposits, Manhattan, Nev., [827J. Enargite: in Butte, Mont., ore-deposits, 403. reducing power, 354, 358. Enrichment of ore-deposits : see Ore-de- posits. Enrichment theory, 408. Eruptions: ejecting metalliferous mag- mas, 716. kiuds of magmas ejected, 715. of igneous material ; source, 43. Eruptive activity : association with ore- deposition, 21. Eruptive rocks: see Rocks. Eruptive theory : ore-deposits, 8. Erzgebirge, Freiberg, Saxony: vein-sys- tem, 52. Eureka district, Nev. : ore-deposits, 58. genesis, 7. Evergreen Copper- Deposits, Colorado (Rit- TER), 835. Exposed Treasure lode, Mojave, Cal.: geol- ogy, 834. gold-deposits, 823. relations of ores, 804. Extraordinary Faulting at the Berlin mine, Nevada (Daggett), 833. Fahlcrantz, A. E. : iron-ores, Sweden, 666. Faltenverwerfungen (fold-faults): defini- tion, 41. Faulting (see also. Fissures) : character of movement, 102. determined by stresses, 104. horizontal : Mt. Guyot, Colo., 64. illustrated by torsion experiments, 99. in Cambrian rocks of Missouri, 88. in Mississippian rocks of Missouri : ab- sence, 88. Leudville, Colo., [3]. Nevada, Berlin mine, 833. Ontario mine, Utah, 62. Queen of the West mine, Colo., 62-64. Fault-fissure deposits: Ontario mine, Utah, 60. Fault-planes : effect on water-channels, 34. Lead vi lie, Colo. : lack of ore-deposits, 10. Faults (see also Fissures and Fold-faults) : extent, 39. lack of uniformity in nomenclature, 40. Fay, A. H. : Geology and Mining of the Tin-Deposits of Cape Prince of Wales, Alaska [Trans., xxxviii, 664-682], Notice, 833. Features of the Occurrence of Ore at Red Mountain, Ouray County, CWo.(Schwarz), 831. Ferguson. H. G.. Irving. J. D., Smith, H. D. : Bibliography of the Science of Ore- Deposits, 837-928. Ferric chloride : solvent of gold, 173. Ferric salts : efficiency iu solution of gold. 781. Ferric sulphate : solvent of gold, 173. Ferrous sulphate : precipitant of gold, 784. reducing power, 355, 356, 358. Filter for sea- water in testing for gold, 198. Finlay, G. I. : analysis of analcite-tingua- ite, 566. analysis of basalt, 567. analysis of camptonite, 566. Finlay, G. I. : analysis of diorite-porphyxy, 564. eruptive rocks of San Carlos range, Mexico, 558. Finlay, J. B. : analyses of gabbro, 563. Fissure-faults : definition, 41. examples : Gunnison county, Colo., 49. San Juan region, Colo., 50. Fissure-planes : repeated movements, 59. Fissure-systems: Clifton-Morenci district, Arizona, 539. Conrad Hill, Davidson county. N. C. : character and origin, 103. origin, 60. simultaneous production, 104. Fissure- veins: extent in depth, 11. gold-bearing, 427. relations of length and depth, 11. so-called : formation, 10. walls, 54. Fissures (see also faults) : conducting ore-bearing solutions, 700. extent, 53. limiting depth, 44. relation of walls, 713. structural features characterizing, 45. Fissuring : relation to ore-bodies, 339. Flo wage-zone : effect on open channels, 699. Fluid-inclusions : Clifton-Morenci district, Arizona, 545. Fluorine : distribution in igneous rocks, 751. Fold-fault: definition, 41. examples, Lead vi lie, Colo., 48. typical form : origin, 47. Foliation-planes: cause, 41. Fo re h hammer: metals in ashes of marine plants, [256]. Formation and Enrichment of Ore-Bearing Veins (Bancroft), 696-719; Supplemen- tary Paper (Bancroft), 720-728. Form u lee for reducing power of minerals, 348. Fossil remains : replaced by ore, 87. Foster, C. Le Neve: veins of Cornwall, 10. Fouque, F. A. : volcanic gases, 388. Fracture : causes, 41. copper-steel : character, 101. Fracture-system : Ontario mine, Utah, 61. Free Coinage mine, Cripple Creek, Colo., 422. Freeland, F. T. : sulphide ores, Lead vi lie, Colo., 3. Freiberg, Saxony : vein-system, 52. Frood mine, McKim township, 8udbury district, Ontario, 500. Fryer hill, Leadville, Colo.: ore-deposits, 13. Fumaroles: gases from, 389. sublimation products: composition, 390. Fumarolic deposits, 368. Fumarolic origin of ore-deposits, 240. Furnace canyon : borax deposits, [835]. Furstenburg: Wenzalvein: varying with country-rock, 227. Fusion, region of: depth, 22. Gabbro : Tamaulipas, Mexico, 563. Galena : effect of pyriteon solubility, [766]. occurrence in shale. Missouri, 330. reducing power, 358. INDEX. 937 Garnet : San Jose, Tamaulipas, Mexico, 570. Gertrude mine, Creigfaton township, Sud- Garnet- Formations of Chillagoe Copper Field, bury district, Ontario, 504. North Queensland, Australia (Smith), 830. j photomicrographs of ore, 491-492. Garrey, Ball, and Spurr: silver-lead de- Geyser: definition, 32. posits of Georgetown and Silver Plume, Geyser shaft : Silver Cliff, Colo. : section, Colo., [816]. Garrey, Emmons, and Ransom e : gold-de- posits, Bullfrog district, Nev., [827]. Garrey, G. H., and Emmons, VV. H. : gold- deposits, Manhattan, Nev., [827]. Garrey, G. H., and Spurr, J. E. : ore-de- posits of Georgetown, Colo., [816], [817]. Gas-content of rocks, 767. Gautier, Armand: gases occluded in rocks, [390], [767]. Geikie, A. : origin of igneous rocks, [260]. volcanic gases, 338. Gellivare iron-deposits, Norrbotten, Sweden, 671. Genesis: Auriferous Lodes (Don), xvi, 162-215. copper-deposits, 75-77. gold- and silver-deposits, 80-81. iron-deposits, 69-71 Lake Valley, New Mexico, Silver- Deposits, Glass cracked by torsional strain, 51. 144. Geyser gold-mine, Silver Cliff, Colo., xvi. analyses of ore, 147. analyses of water, 151, 152. country-rocks, 143. deep deposits, 142. exploration-work, 143. nitrate-content of waters, 768, 778. ore-bodies, 145. vein-materials, 146. water-courses, 147. Gilbert, G. K. : temperature of thermal waters, 245. Gillette, H. P. : Osmosis as a Factor in Ore- Formation, xxiv, 450-454. Glaciation : control of depth of alteration, 121. Glaciers in the United States : first dis- covery, xxxi. (Keyes), 835 lead- and zinc-deposits, 77-79. manganese-deposits, 74-75. nickel deposits, 75. Ore-Deposits ( Emmons), xi, 1-25. Ore- Deposits at Bingham, Utah (BoUT- WELL). 831. quicksilver-deposits, 79. Sudbury, Ontario, nickel-ores, 477. Tonopah ores, 598. Genetic Relations of the Western Nevada Ores (Spurr), xxvi, 590-620. Geologic history: California region, 583. Geological Distribution of the Useful Metals in the United States (Emmons), xii, 65-83, 89-90 ; Discussion, 83-91. Geological maps : central Sweden, 658. Lake Superior region, 636. Norrbotten, Sweden, ore-province, 673. San Jose district, Tamaulipas, Mexico, 560. Geology and Copper- Deposits of Bisbee. Ari- zona (Ranbome), 829. Geology and Mining of the Tin-Deposits of Cape Prince of Wales, Alaska (Fay), 833. Geology and Petrography of the Goldfield Mining- District, Nevada (Hastings and Berkey), 832. Geology: Clifton-Morenci district, Ari- zona, 518. Exposed Treasure Lode, Mojave, Cali- fornia (De Kalb), 834. Lake Superior iron-bearing and copper- bearing series, 633. Rossland, B. C, pyrrhotite-deposits, 48. South Island, New Zealand, 162. Sudbury, Ontario, nickel-deposits, 479, 481. Treadwell Ore- Deposits, Douglas Island, Alaska (Spencer), 830. Virginia Barite- Deposits (Watson), 834. Georgetown, Colo. : silver-lead deposits, 816. Georgetown quadrangle, Colo. : gold-de- posits, 817. Glass plates : torsional experiments, 95. God iva mountain ore-bearing beds, 338. Gogebic district: locus of ore-deposits, 646. Gold : allotropic forms : behavior with mercury, 107. conditions producing, 108. conversion to ordinary form, 108. AUotropism (Louis), 105-109. amalgamation, 107. association : with carbonaceous slates in California, 211. with coal, 321. with mangauese oxides, 786. with platinum in Urals, 289. with pyrites, 132. with sulphides, 203. chemical properties, 107. concentration in oxidized zone, 797. contact-metamorphic deposits, 432. criteria for determining secondary origin, 792. crystallization, 105. deep-seated enrichment: vertical rela- tion to chalcocitization, 798. determination of small amounts in sea- water, 829. difference between placer- and vein- gold, 182. distribution in igneous rocks, 752. experiments in solution and deposition, [763], 771. fineness : variation, 182. forms from precipitation, 105. free: in undecomposed rocks, 208, 214. general diffusion, 209. geologic age of deposition, 429. in assays of California rocks, 301. in coal from Wyoming, 211. in country-rock, 210. in country -rock at deep levels, Wain alia, Victoria ; curve, 193. in diorite, 90. in igneous rocks, 271. in mine-waters: evidence for, 178. search for, 179. 59 938 INDEX. Gold : in sea-water, 191, 192. determinations, 195. methods of detecting 193. in siliceous igneous rocks, 286. in vadose eouutry-rock,- Walhalla, Vic- toria : carve, 192. mode of occurrence, 108, 724. native : deposition by primary processes, 793. natural solvents, 173. occurrence in sulphides, New Zealand, 170. origin in stratified deposits, 191. placer-deposits, 133. precipitation, 784. by black shales, 331. from sea- water, 194. experiments, 198, 199. in marine sediments, 196. reagents, 108. relative fineness of vadose and deep vein- gold, 184. "rustiuess," 109. solution : reactions, 777. and re-precipitation, 206. in vadose waters, 177. source, 201. in pyrite, 203. specific gravities, 106. tests for : in rocks at Leadville, Colo., 16. transfer in cold solutions, 785. varieties, 105. Wit waters rand, Transvaal : action with reagents, 109. Gold Circle, New : gold -deposits, 827. Gold Coin gold-mine, Cripple Creek, Colo., 419, [821]. Gold-concentrations: occurrence, 271. Gold-content of sea-water : amount, 206. Gold-deposits (see also Gold-silver de- posits) : Agency of Manganese in Alteration and Enrichment, 759-828. Alabama, [810J. Alaska: Berner's Bay. 811. Treadwell miues, 811. alteration, 132-133. Appalachian, 806. association with eruptive rocks, 80. Bannack tvpe, 381. California, Bodie, 823. Mojave : Exposed Treasure mine, 823. Mother Lode district, 811, 830. Nevada City aud Grass Valley district, 812. Ophir district, 813. classification according to age, 433. classification (Liudgren's). [763], [806]. Colorado : Cripple Creek, 159, 819. Georgetown quadrangle, 817. Leadville, 815. Mt. Guyot, near Breckenridge, 64. San Juan, 818. Summit district, 822. concentration, 80. in oxidized zone, 797. Cretaceous, 435, 806. formation, 172. greater richness in vadose region, 171. Homestake type in South Dakota, 806. Idaho, [815]. Gold-deposits: Montana, Granite moun- tain, 122. other districts, 815. Philipsburg, [762], 814. Nevada : Bullfrog district, 827. Delamar mine, 828. Edgemont, 815. Gold Circle district, 827. Goldfield, 825. Manhattan. 826. Silver Peak, 813. Tonopah, 68. Ontario, 445. Pre-Cambrian, 434. South Carolina: Haile mine, 806. South Dakota: Black Hills, 810. Southern Appalachian districts, 809. Tertiary, 807. United States : superficial alteration and secondary enrichment by ageney of manganese, 759. Utah : Annie Laurie mine, 827. Golden Cycle mine, Cripple Creek, Colo.,. 422. Goldfield district, Nevada: geology and ore-deposits, 599. geology and petrography, 832. gold-deposits, 825. Gold Ledge, Mercur, Utah : origin, 290. Gold-mine waters : salts in, 764. Gold-mines (see also Gold-silver mines) : Alaska : Treadwell, Douglas Island, 811. Cal i forn i a : Exposed Treasu re, Mojave, 804, 823. Colorado: Camp Bird. Ourav, [787], [818]. Geyser, Silver Cliff, [766]. Gold Coin, Cripple Creek, [821] Pharmacist, Cripple Creek, [819]. Summit, Cripple Creek, [819]. Tomboy. Silverton, [787], [818]. Montana: Cable, Philipsburg, [762],[814]. Granite-Bimetallic, Philipsburg, [762], [814]. Nevada : Crowning Glory, Silver Peak,. [813]. Delamar, [794], [828]. Drinkwater, Silver Peak, [813]. South Carolina: Haile, [794], [810]. Utah : Annie Laurie, [827], Gold Mountain, Nev. : geology and ore- deposits, 599. Gold-ores : in contact-deposits, 380. Gold -product! on : future status, 442. 445. increase : causes, 442. North America, 442-444. The Geological Features: (Lindgben),. xxiii-xxiv, 424-444. Tertiary deposits, 438. unit of measurement, 433. Victoria, 171. Gold-provinces of the United States, 806. Gold-quartz veins: connection with basic igneous rocks. 284. genetic connection with siliceous ig- neous rocks, 279. Gold-silver and silver-gold ores : vertical relations, in deposits, 799. Gold-silver deposits: California: Bodie, 823. Mojave, 823. Ophir district, 813. INDEX. 939 Gold-silver deposits Montana: Philips- burg, [762], [814]. Nevada: Gold Hill group, Comstock lode, [804.] Gold-silver mines (see also Silver-gold mines): Nevada: Gold Hill group, Comstock lode, [804]. Yellow Jacket, Comstock lode, [804]. Gonzalo, Joaquin : copper - deposits of Huelva, xli. Gooch and Whitfield : arsenic in hot- springs waters, [404]. Gossan : appearance, 112. definition, 112. Gossan-ores: Appalachians, 73. Gottlob vein, Freiberg, Saxony, 218. Gottschalk and Buehler : effect of pyrite on solubility of galena, [766]. Grabill, L. R.: charcoal in the Bassick mine, 319. Grand Central mine, Tintic district, Utah, 335, 337. Grangesberg, Sweden : map, 662. Grangesberg iron-deposits, Sweden, 671. Granite : New Zealand : samples for anal- ysis, 163. solution by acids, 726. Granite-Bimetallic gold-mine : Philips- burg quadrangle, Mont., 814. Granite-Bimetallic lode : Philipsburg quadrangle, Mont. : character of gold- enricbment, 762. Granite mine, Cripple Creek, Colo., 419. Granite Mountain, Montana, gold-depos- its : depth of alteration, 122. Granitic rocks: origin, 608. Graphite: occurrence. 315. Grarberg mines, Sweden: origin of iron- ores, 670. Grass Valley, Cal.: gold-deposits, 812. Gratou, L. C: enrichment* of gold-depos- its, Haile mine, S. C, [810]. gold-deposits of central and southern North Carolina, [835]. minerals in Appalachian gold-deposits, 809. Gravity : influence in magmatic differen- tiation, 72. Great Gulch ores : genetic relations, 612. Groddeck, A. von : nature of veins. 26. Kristiania type of contact-deposits, 372. ores in sedimentary rocks, 256. replacement ores, xxxix. Grossularite: San Jose, Tamaulipas, Mex- ico, 572. Ground-water : in mines, 248. in lithosphere, 698. Guadalupe mine, Chihuahua, Mex.: vein- formation, 218. Gunnison region, Colo.: bog-iron deposits, 32. walls of fissure- veins, 55. Gunther, C. G., and Kemp, J. F.: The White Knob Copper- Deposits, Mackay, Idaho [Trans., xxxviii, 269-296], Notice, 833. Gympie, Queensland : rocks, 163. Gypsum-deposits: alteration, 114. " expansion in formation, 116. formation, 116. Habermehl: composition of pyrrhotite, 459. Hague and King: genesis of Comstock lode, x. Haile gold-mine, South Carolina, [794], [806], [810]. Hall, C. W. : origin of pegmatite, 275. Hallowell, J. K. : ore-deposits in Gunnison region, Colo., 32. Halogens : agency in transferring metals, 728. Haloid compounds in ore-deposits : forma- tion in arid regions, 135. Harker, Albert : average composition of igneous rocks, [734]. contact-effects in Westmoreland. 575. Hastings, J. B. : Are the Quartz- Veins of Silver Peak, Nevada, the Result of Mag- matic Segregation?, xxvi, 621-628. Hastings, J. B., and Berkey, C. P. : The Geology and Petrography of the Goldfield Mining-District, Nevada [ Trans., xxxvii, 140-159], Notice, 832. Hausmann : iron-ores of Taberg, Smaland, 681. Hawes : contact-metamorphic phenomena, 525. Headden, W. P. : deposition of basic sul- phate, 710. Heat : role in ore-deposition, 2. Heim, A. : classification of rock -fractures, 41. limiting depth of fissures, 44. Hematite : Grant county, N. M. : origin, 127. transformation to and from magnetite, 670, 671. Henrich, F. : decomposition of volcanic rocks, 727. Hill, R. T. : Cretaceous rocks of Tamau- lipas, Mexico, 561. origin of Mexican iron-deposits, 127. Hillebraud, W. F. : analyses : sinters, 149. water from Geyser mine, 151, 152. elements in igneous rocks, 732. Hills, R. C. : formation of ore-deposits, [233]. gold -deposits, Summit district, Colo., 822. Hillside mine, Cripple Creek, Colo., 420. Hinge-faults : definition, 103. Hoefer : ores in sedimentary rocks, 256. Hoefer's Method of Determining Faults in Mineral Veins, [101]. Hogbom : iron-ores of Norrbotten, Swe- den, 678, 679. Hdgborn mines, Sweden : plan, 668. Horn-silver: in Exposed Treasure mine, Mojave, Cal., [804]. in mines on Comstock lode, Nev., [804]. theories of formation, 800. Hornblende: in rocks of New Zealand, Victoria, and Queensland : analyses, 167-168. separation from augite, 166. separation from rocks for examination, 165. separation from syenite, 165. Hot springs : decrease in flow, 704. explanation, 597. Howe, H. M. : Discussion on The Torsional Theory of Joints, 101. 940 INDEX. Huanatajayite : occurrence, 136. Humboldt mine, Rosita, Colo. : locus of ore-bodies, 24. Humus acid : reducing power, 351, 357. Hunt, T. S. : classification of crystalline rocks, 68. Huron ian rocks : Lake Superior region, 69. Hussak, E. : auriferous quartz- vein in Brazil, 276. Hutton, F. W. : geology of Otago, New Zealand, [162]. source of ore-materials of Thames dis- trict, N. Z., 164. Hydration, depth of, 119. Hydrocarbons : classification, 308. protective action, 311. reducing action, 305. Hydrogen : reducing power, 307. Hydrothermal metamorphism, 529. Idaho: gold -production, 437, 440. Iddings, J. P. : consanguinity of rocks, 738. contact metamorphic effects, 384. formation of veins, [394]. origin of igneous rocks, 261. Igneous activity : periods, 429. Igneous coutacts: relation to ore-deposi- tion, 365. Igneous rocks (see also Rocks) : Igneous Rocks and Circulating Waters as Factors in Ore-Deposition (Kemp), xxi- xxii, 235-250. Segregation or Differentiation as Related to the Occurrence of Ores (Spurr), xxii, 251-303 ; Discussion (Winch ell), 303- 304. Ilmenite : in eruptive rocks, 70. Immortal mine, Silver Cliff, Colo., [140]. Independence mine, Cripple Creek, Colo., 419. India: Travancore: quartz-reefs, 282. Indian Queen mine, Birch Creek, Beaver- head county, Montana, [374]. Influence of Country Rock on Mineral Veins (Weed), xxi. Intrusions : effects on circulating waters, 247. effect on water-channels, 34. Ontario mine, Utah, 60-62. source of ore-materials, 20. Iodine : solvent of gold, 173. Iron : concentration, 255. in basic rocks, 285. in igneous rocks, 266, 267. in mine- waters, 770, 781. reducing power, 358. Iron and manganese: in rocks: chemical relations, 795. relative amouuts in vadose and deep waters, 153. Iron -de posits: alteration, 114. 124. Appalachian region: mode of occur- rence, 117. origin, 71. surface-action, 125-126. bog : Colorado, 32. conditions favoring formation, 73. contact deposits in Christiania region, 692. contraction in formation, 117. Elba Island, 8-9. Iron-deposits : eruptive-origin theory abandoned, 8. formed by magmatic segregation in basic eruptions, 680. genesis, 9, 69-71, 124. keratophyre type, 672. lake- and bog-ores, 694. Lake Superior region, 637. character, 647. mode of concentration, 641. origin and development, 29, 69-71, 124, 642, 654. magnetic : Pennsylvania, 73. Marquette region, Mich.: origin, 71. Mesabi range, Minn.: origin, 125. Missouri : genesis, 87. Iron Mountain : 87, 126. Pilot Knob, 87. of metamorphosed Canibro-Silurian schists, 689. Ovifak, Greenland, 72. relations to eruptives, 72-73. Scandinavian: The Geological Relations of (Sjogren), xxvi, 657-695. Styria : surface-action, 126. Sweden : central : types and origin, 659. Norrbotten : structure, 676. genesis, 677. Sweden and Norway : lake region, 127. Texas: origin, 127. eastern : surface-alteration, 126. titaniferous: map of distribution in Scandinavia, 682. types : derivation, 73. examples: 73. Iron fault, Leadville, Colo., 48. Iron Mountain, Mo. : ores : occurrence, S7. Irving, J. D. : classification of Algonkian rocks, 69. genesis of Lake Superior iron-deposits, 29. iron ores: origin, 70. minerals of gold-deposits, Homestake belt, Black Hills, S. D.,810. Irving, J. D., and Emmons, S. F. : Down- town District, xxxviii. Irving, Emmons, and Jaggar : gold-depos- its, Black Hills, S. D. [810]. Irving, J. D„ Smith, H. Dm Ferguson, H. G. : Bibliography of the Science of Ore- Deposits, 837-928. Isabella mine, Cripple Creek, Colo., 422. Jackson, D, D.: chlorine in waters, 767. Jacque mountain, Ten -mile district, Colo.: structural features, 62. Jaggar, Emmons, and Irving : gold-depos- j its, Black Hills, S. D., [810]. I Jenney, W. P.: The Chemistry of Ore-De- position, xxii, 305-363. formation of solid oxidized hydro-car- bons, 308. genesis of Missouri lead- and zinc-depos- its, 78. lead- and zinc-deposits of the Mississippi Valley, 306. Jerome, Ariz.: copper-deposits, 136. Jimenez copper-mine, Chihuahua, Mexico, .[374]. Joass and Cameron: Sutherland gold- fields of Scotland, 281. INDEX. 941 Joints : definition, 40. 101, 103. ore-bearing: Silver Cliff, Colo., 141. origin and extent, 35, 93. phenomena, 92. relation to ore-deposition, 35. Torsional Theory (Becker), 92-104. Joplin region, Missouri : ore-deposits, 833. Josie mine, Rossland district, B. C, 509. Judd, J. W.: chlorine in volcanic emana- tions, 723. disintegration of volcanic rocks, 727. Judson, J. N.: magnetic separation of nickel-ores, 467. Juvenile waters : origin, xx. Kaolinizatiou, depth of, 119. Kawich district, Nevada: geology and ore-deposits, 600. Keck, Rudolph : association of organic matter with ore-deposits, 344. Kemp, J. F.: Igneous Rocks and Circulating Waters as Factors in Ore- Deposition, xxi, 235-250. The Copper- Deposits at San Jose, Ta- maiUipas, Mexico, xxv-xxvi, 557-581. Ducktown, Tenn., copper-deposits, 810. genesis of ore-deposits, [253]. igneous rocks a source of vein-materi- als, 222. metals in eruptive rocks, [707]. metals in igneous rocks, 295. order of formation of minerals in crys- talline rocks, 263. origin of pegmatites, 276. origin of Sudbury nickel-ores, 483. rdle of igneous rocks. 384. R6le of the Igneous Rocks in the Formation of Veins, xix. 696. secondary enrichment in copper-depos- its. [761]. silica in the Sierras, 280. Silver-Islet mine, 231. vein-system of San Juan region, Colo., 290. Kemp, J. F., and Gunther. C. G.: The Wliite Knob Copper- Deposits, Mackay, Idaho [Trans., xxxviii, 269-296], Notice, 833. Keweenawan rocks, Lake Superior re- gion, 69. Keyes, C. R.: Borax- Deposits of the United States [Trans., xl, 674-710]," Notice, 835. Genesis of the Lake Valley, New Mexico, Silver-Deposits [Trans., xxxix, 139- 169], Notice. 835. chlorine in arid regions, 768. Keystone mine, Silver Cliff, Colo., [140]. Kiirunavaara iron -ore deposits, Sweden, 672. Kimball, J. P.: replacement of limestones by iron-ores, 70. King, Clarence : genesis of Butte, Mont., deposits, 404. horn-silver. 803. manganese in Comstock lode, 802. meridional zones of mineral -deposits, [81]. views as to genesis of ore-deposits, x. King and Hague : genesis of Comstock lode, x. King, William : joints, 93. I Kinta Valley, Federated Majay States : tin-deposits, 832, Klein '8 solution : advantages, 166. Klockmann : contact-metamorphic phe- nomena, 525, 527. Knaffl, Ludwig : amalgamation of gold, 107. Knopf, Adolph : gold-deposits, Berner's Bay district, Alaska, 811. K 03 nig, G. A., and Stockder, M.: occur- rence of coal with silver, 321. Kohler, E.: adsorption process, 536* Kohlrausch: solubilities of silver-salts, I 800. I Kolecki, Theodore : contour sketch-maps, j [xxxii]. j Kootenay volcanic group, 495. Kristiania type of contact ore-deposits, 372. permanence in depth, 393. Laccolith: San Jose, Tamaulipas, Mexico, 563. Lacroix, A.: metals in fumaroles, 721. Lake Superior iron-ores : character, 647. Lake Superior region : Algonkian rocks, 69. development of rocks, 648. geological map, 636. iron -deposits, 69. genesis, 29. mode of concentration, 641. origin and development, 642, 650, 654. time of concentration, 649. topographic relations, 650. pre-Cambrian series, 634. Lake Wakatipn, New Zealand : vadose country-rock : analyses, 189. Lap pa rent, A. de : solution -theory of ore- deposition, 2. Lassaigne : solubility of manganese, [796]. Lateral migration : manganese salts, 794. Lateral-secretion theory : ore-genesis, xiii, 23-24, 82, 83, 160, 171, 201. 204, 210, 213. Lava : experiments on, 725. gaseous content, 767. Lava streams : Vesuvius: steam from, 701. Law of areal distribution of mining-dis- tricts, 325. Law of replacement, 9. Lead : distribution in igneous rocks, 753. tests for: in rocks at Leadville, Colo., 16-17. Lead-deposits : alteration, 131. Australia: Chillagoe district, North Queensland, 830. Commem, Eifel district, 36. genesis, 77-79. source of material, 77. Virginia-Tennessee region, 831. Lead- and zinc-deposits: association with eruptives, 78. Missouri : occurrence in Carboniferous rocks, 88. occurrence in Franklin county, 89. Missouri region : genesis, 78. Virginia-Tennessee Region (Watson ), 831- 832. Lead oxides : agency in solution of gold, 780. 942 INDEX. Leaders : definition, 51. Lead vi He, Colo. : investigations of coun- try-rocks, 23. ore-deposits : character, 27, 38. genesis, xi, 5. investigation, 26. original depth, 7. sulphide origin, 3. silver-, lead-, and gold-deposits, 815. silver-lead deposits : aqueous origin, 2. Le Conte, Joseph : Discussion on The Genesis of Certain Auriferous Lodes, 202. association of eruptive activity with ore- deposition, 21. chlorine as solvent of gold, 763. genesis of metalliferous veins, 14-15. mis-statement of Emmons's views on Leadville ores, 4. Ledoux, A. R. : contact-metamorphism in Boundary district, 375. Lehner, Victor: lead oxide: effect on solubility of gold, [780]. Leith, C. K. : A Summary of Lake Superior Geology with 8pecial Reference to Recent Studies of the Iron- Bearing Series, xxvi, 633-656. Leptoclases : definition, 40. Levack township deposits, Sudbury dis- trict, Ontario, 507. Levigation theory : ore-deposits, 14. Lignite : association with ore-deposits, 322. reducing power, 351, 357. Limburgite : Cripple Creek district, Colo., 412. Lime : quantity in igneous rocks, 732. Limestone : analyses, 334, 335, 337, 338. chlorine-content, 766. oxidation, 535. relation to ore-deposits, 333. Sau Jose, Tamaulipas, Mexico. 568. Limonite : eastern Texas: origin, 126. Limonites: origin, 124 Lincoln, P. C. : The Promontorio Silver- Mine, Durango, Mexico [TYans., xxxviii, 734-746], Notice, 834. Lindgren, Waldemar: The Genesis of the Copper- Deposits of Clifton- Morenci, Arizona, xxv, 517-556. # The Geological Features of the Gold-Pro- duction of North America, xxiii-xxiv, 424-444 The Occurrence of Stibnite at Steamboat Sprijigs, Nevada, xxvi, 629-632. andradite at Clifton-Morenci, Arizona, [572]. Annie Laurie gold-mine, Utah, 827. auriferous quartz-vein in Brazil, 276. Character and Genesis of Certain Contact- Deposit *, [xixj. contact-deposits, 230, 237, [372]. contact-metamorphic deposits, 528. contact metamorphism, 371. copper-deposits, Clifton-Morenci dis- trict, Arizona, [788]. formation of metalliferous veins, 369. garnetization at Clifton-Morenci, Ariz., 579. genesis of ore-deposits, [253]. gold -deposits : classification, [763], 807. Nevada City and Grass Valley, Cal., 812. LlNDGBEN, WALDEMAR: gold-deposite : Ophir district, Cal., 813. southern Appalachians: associated minerals, [809]. hypothesis of igneous emanations, 582. magmatic differentiation, 722. magmatic origin of ore-deposits, 619. metal logenetic epochs, 806. metals in gneiss, [707]. Metasomatic Processes in Fissure- Veins, [xviii]. metasomatic replacement, [223], 225, 232. metasomatism, xl. osmosis in ore- formation, [xxiv]. primary pyrites, 204. relation of ore-deposition to physical conditions, 763. telluride ores, 380. vein-forming waters, 586. Lindgren, W., and Bansome, F. L. : gold- deposits. Cripple Creek, Colo., 819. List of Scientific Publications of Samuel F. Emmons, xlii-xlvii. Lithium: distribution in igneous rocks,746. quantity in igneous rocks, 734. Lithoclases: definition, 40. Liversidge, A.: gold in sea-water, 193. gold in solution, 177. origin of nuggets, [182]. Lodes: metalliferous: successive zones in depth, 789. Lofstrad: iron-ores of Norrbotten, Swe- den, 678. Lone Mountain ores, Nevada: genetic relations, 614. Longfellow limestone, Clifton-Morenci district, Arizona, 519, 523. Lossen : quotation from Groddeck, 26. Lotti, B.: studies of Elba iron-ores, 9. Louis, Henry : The Allotropism of Gold, xv., 105-109. mode of occurrence of gold, 108. ore-deposits in Permian of Nova Scotia, [327]. Lucky Guss mine, Cripple Creek, Colo., 422. Luossavara iron-ore deposits, Sweden, 673. McCaskey, H. D.: gold-deposits, Alabama, [810]. McCanghey, W. J.: experiments on solu- tion of gold, 763, 771, 772, 776, 798. McDermott, W.: association of graphite and silver in Silver-Islet mine, 317. McLaughlin, R. P.: gold-deposits, Bodie, Cal., [8231. McTighe, T. J.: magnetic separation of nickel-ores, 467. Macetown gold-district, N. Z.: assays. 184. Magmas : action during cooling, 725. differentiation phenomena, 687. kinds ejected in eruptions, 715. relations to ore-bodies, 717. temperature, 724. water in, 702. Magmatic differentiation: ore-deposits, 67, 84. 205, 274. Magmatic Origin of Vein- Forming Waters in Southeastern Alaska (Spencer), xxvi, 582-589. INDEX. 948 Magmatic segregation, 288. as working hypothesis, 292. effect on ore-deposits, 300. Magmatic waters : origin, xx. rdle, 584. Magnesia : quantity in igneous rocks, 732. Magnesium : in mine- waters, 768. Magnetic iron-ore deposits, Pennsylvania, 73. Magnetite: in eruptive rooks, 70. in magmas, 72. in rocks of New Zealand and Victoria: analyses, 167, reducing power, 358. San Jose, Tamaulipas, Mexico, 573. transformation to and from hematite, 670, 671. Magnetite-deposits : Colorado : genesis, 74. Malaguti : metals in ashes of marine plants, [256]. Malaguti and Durocher: silver in sea- water, 191. Mallet, J. W.: silver in volcanic ash, 721, Malm, J. L.: chlorination treatment of ores, 722. Mammoth mine, Tintic district, Utah, 335, 337. Manganese: Agency in Super ficial Altera- tion and Secondary Enrichment of Gold- Deposits, 759-828. chemical relations with iron in rocks,795. chemistry of, 780. concentration, 255. distribution in igneous rocks, 751. effect on solubility of gold, 778. experiments on solution, 795. in igneous rocks, 267. in mine- waters, 770, 781. occurrence in gold-deposits. 779. quantity in igneous rocks, 733. use in chlorination process, 762. Manganese and iron, relative amounts in vadose and deep waters. 153. Manganese-deposits : alteration, 127-128. Batesville, Ark., 128. Manganese-ore : bog : formation, 128. 