.288 



INDEX. 



Bethlehem, Perm., zinc mines near, 



174. 



Beulah antimony mine, Nev., 259. 

 Big Cottonwood Canon, Utah, 192. 

 Big Creek, Nev., 359. 

 Bimetallic mine, Butte, Mont., 221. 

 Bingham Canon, Utah, 192-225. 



Cited as illustration of gossan, 39. 

 Bisbee copper district, Ariz., 148. 

 Bismuth, 260, 261. 

 Bitter Root Mountains, Idaho, 222. 

 Black-band iron ore, 87. 

 Black Copper groups of copper mines, 



Arizona, 150. 

 Black Hills, geology, 9. 



Geology and mines, 216-218. 



Gold in Potsdam, 240. 



Placers, 245. 



Tin, 273. 



Black Range copper mines, Arizona, 

 151. 



Copper district, 228. 

 Blake, W. P., on the Deep Creek 

 mines, 225. 



On the Silver King mine, Arizona, 

 228. 



On Tombstone, Ariz., 229. 



On Utah antimony, 260. 



Ruby silver ore, Poorm'an lode, 



223. 



Block iron ore, 87. 

 Block Island, R. I., magnetite sands, 



128. 



Blow, A. A., illustration of fault by, 

 17. ' 



Cited on Leadville, Colo., 185. 

 Bluebird mine, Butte, Mont., 221. 

 Blue lead in California gravels, 246. 

 Blue Mountains, Oregon, 239. 

 Bog iron ore, 73. 



Precipitated bv algae, 75. 

 Bog ore at Three Rivers, 279. 

 Boise Co., Idaho, 223. 

 Bonanza City, Idaho, 223. 

 Bonanza of ore, 37. 

 Bonne Terre, Mo., lead mines, 158. 

 Bonneville, Lake, 230. 

 Bonsacks, Va., illustration of gossan, 

 39. 



Zinc mines, 172. 

 Boone cherts, Arkansas, 265. 

 Boss of igneous rock defined, 11. 

 Boston Mountains, Ark., 265. 

 Boulder Co., Colo., 214. 



Iron ores, 126. 

 Box Elder Co., Utah, 225. 

 Boyd, C. R., on Virginia zinc mines, 

 ' 282. 



Brandon, Vt., manganese, 263. 

 Bristol, Conn., copper mine, 153. 



British Columbia gold gravels, 256. 



Platinum, 272. 

 Britton, N. L., cited on the geology of 



the Highlands, N. J., 123. 

 Broadhead, G. C., cited on Missouri 



geolosry, 282. 



Brooks, T. B., on the Marquette dis- 

 trict, 101, 102. 

 Origin of ores, 106. 

 Browne, D. H., on phosphorus in iron 



mines, 130. 

 Browne, R. E., on California gravels, 



246, 247. 



Brown hematite, Arkansas, 279. 

 Brunton, D. W., cited on Aspen, 



Colo., 188. 



Bucks Co., Penn., iron mines, 125. 

 Buckwheat mine, Franklin Furnace, 



N. J., 177. 



Buena Vista, Colo., 212. 

 Buford Mountain, Mo., 116. 

 Buhrstone ore, 88. 

 Bull Domingo mine, Colo., 36, 213. 

 Burden spathic ore mines, Hudson, 



N. Y., 89. 



Burro Mountains, N. M., 203. 

 Butte, Mont., 220. 



Copper mines, 136, 137, 142. 

 Illustrates infiltration by ascen- 

 sion, 32. 



Placers near, 245. 

 Calaveras Co., Cal., 249. 

 Caldwell Co., Ky., lead and zinc 



mines, 166. 



Calico district, Cal., 242. 

 California, Chromite, 261. 

 Copper mines, 136. 

 Literature, 136. 

 Geology, 241. 

 Gulch, near Leadville, Colo., 211, 



245. 



Kern Co., antimony, 259. 

 Lead-silver ores, 198. 

 Magnetite, 126. 

 Mercury, 267, 268. 

 Platinum, 272. 

 Tin, 274. 



Yuba and American rivers, 282. 

 Gallon scheme of classification of 



ore deposits, 47. 

 Calumet and Hecla copper mines, 



Michigan, 141. 

 Iron mine, Colorado, 126. 

 Campbell Mountain near Creede, 



Colo , 209. 



Campo Seco, Cal., copper mines, 136. 

 Canada bog ores, 279. 

 Gold, 255, 256. 

 Magnetite ore mines, 122. 

 Titaniferous magnetite, 280. 



