300 



INDEX. 



South Dakota, source of ore, 277. 



Southern States, gold, 252. 



South Mountain, Perm., iron mines, 



123, 125. 



Literature, 124, 125. 

 South Park, Colo., 212. 

 South Wallingford, Vt., manganese, 



263. 



Spanish Peaks, Colo., 212. 

 Spathic iron ore, 86-91. 

 Spenceville, Cal., copper mines, 136. 

 Sperry, F. L., discovered sperrylite, 



272. 



Sperrylite, 272. 



St. Clair limestone, Arkansas, 265. 

 St. Franois Co., Mo., gash veins, 165. 

 St. Genevieve, Mo., copper mines, 



143. 



Geology, 282. 

 St. Lawrence Co., N. Y., lead mines, 



156. 

 Stanley -Browne, J., cited on gold in 



sea beaches, 240. 

 Stannite, 273. 



Star District, Utah, iron mines, 128. 

 Steamboat Springs, Nev., illustrate 



infiltration by ascension, 32. 

 Mercury mines, 267. 

 Stein Mountains, Ore., 239. 

 Stelzner, A. W., cited on source of 



ores, 25. 

 Sterling Hill, zinc mines, Ogdens- 



burg, N. J., 174-178. 

 Stevens Co., Wash., gold, 238. 

 Stibnite, 259. 



Stillwater Co., Wyo., gold mines, 216. 

 Stobie nickel mine, Sudbury, Ont., 



270. 



Stokes Co., N. C., magnetite, 125. 

 Storey Co., Nev., 232. 

 Strahan, A., cited on explosive slick- 



ensides, 19. 

 Stream tin, 273. 

 Structure of veins, 35. 

 Sudbury, Ontario, 131. 



Nickel, 270. 



Sullivan Co., N. Y., lead mines, 158. 

 Sullivan, Me , silver mines, 201. 

 Sulphur Bank, Cal., mercury mine, 



267. 

 Summit Co., Colo., 211. 



Ten Mile district, 185, 186. 

 Summit Co , Utah, lead-silver, 195. 



Silver mines, 225. 

 Summit district, Rio Grande Co., 



Colo., 212. 



Sunrise, Wyo., copper, 152. 

 Sweden, lake ore, 75. 

 Nickel, 272. 

 Titaniferous ores, 281. 



Sweetwater district, Wyo., 245. 

 Sylvanite mine, Gothic, Colo., 211. 

 Syncline denned, 11. 



Cause of cavities, 14. 

 Tacoma Mountain, 238. 

 Tamarack copper mines, Michigan, 



Tarr, R. S., on rifting, 12. 

 Telegraph mine, Utah, 194. 

 Telluride ores, Colorado, 214. 

 Tellurides in gold quartz, 248. 

 Temescal tin mines, California, 274. 

 Tern Pahute district, Nev., 231. 

 Ten Mile district, Colo., 185, 211. 

 Tennessee, Clinton ore, 94. 

 Tennessee limonite, 78, 82. 

 Tenny Cape, N. S., manganese, 266. 

 Terrane defined, 5. 

 Texas, copper, Llano Co., 139. 

 Limonite, 78. 

 Triassic or Peruvian copper ores, 



154. 

 Thiess-Hutchins antimony mines, 



Nev., 259. 



Three Rivers, Can., bog ores, 279. 

 Thunder Bay, Lake Superior, 202. 

 Tilly Foster iron mine, N. Y., 123, 



124. 



Tin, 273, 274. 

 Tin Cup, Colo., 211. 

 Tintic district copper mines, Utah, 



152. 



Lead- silver, 194. 

 Other silver mines, 225. 

 Titaniferous magnetite, 122, 280, 281. 

 Tombstone district, Arizona, 229. 

 Tooele Co. , Utah, 194, 225. 

 Torrington, Conn., nickel mine, 270. 

 Tourtelotte Park, near Aspen, Colo., 



188. 



Toyabe range, Nev., 232. 

 Treadwell mine, Alaska, 255. 

 Triassic copper ores, 152-154. 



Copper mines, general relations, 



276. 

 Trotter zinc mine, Franklin Furnace, 



N. J., 176. 



Tucson, Arizona, 229. 

 Tuolumne Co., Cal., 249. 

 Tuscarora district, Nev., 232. 

 Tybo, Nev., 231. 

 Ueberroth zinc mine, Pennsylvania, 



174. 



Uintah Mountains, 10, 224. 

 Ulster Co., N. Y., lead mines, 158. 

 United States Antimony Co., Phila- 

 delphia, 259. 

 United States Geological Survey, 



terms used by in geological 



classification, 4. 



