INDEX. 



Abiquin, N. M., copper ores, 154. 

 Adams, F. D., on granite at Doug- 

 lass Island, 255. 



Adirondack titaniferous ores, 280. 

 Agglomerates, 200. 

 Alabama, Clinton ore, 95, 96. 



Gold mines, 252. 

 Limonite, 78, 84. 



Tin, 274. 



Alaska, geology, 253, 254. 

 Aleutian Islands, 25+. 

 Algonia, platinum, 272. 

 Alice mines, Butte, Mont., 220. 

 Alleghany Mountains, geology, 8. 

 Alturas Co., Idaho, 223. 

 Aluminium, 258. 

 Amador Co., GJ!., 249. 

 American River, Cal., 282. 

 Ancram lead mine, N. Y., 157. 

 Anthony's Nose, nickel mine, 270. 



Mine of pyrrhotite, 131. 

 Anticlines, 11. 



Cause of cavities, 11. 

 Antimony, 259, 260. 



Nevada, 232. 

 Apache Co., Ariz., 228. 

 Appalachians, general description, 6, 

 7. 



Topography, 6, 7. 



Geology, 7, 8. 

 Argentine, Clear Creek Co., Colo., 



211. 

 Arizona copper mines, 144-152. 



Geology, 227. 



Lead-silver ores, 198. 



Prince copper mine, Arizona, 

 150. 



Silver mines, 275. 

 Arkansas, antimony, 259. 



Bauxite, 258. 



Iron ores, 279. 



Limonite, Addenda. 



Manganese, 264-266. 



Nickel, 271. 



Silver mines, 201. 

 Arksut Fjord, Greenland, 258. 

 Arlington, N. J., copper mines, 153. 

 Arnold iron mines, N. Y., 122. 

 Arsenic, 260. 



Ascension by infiltration, 29, 30-32. 

 Ashcroft iron mines, Colo., 126. 

 Aspen, Colo., 186-190, 211. 



Iron mines near, 126. 

 Atlantic copper mine, Mich., 141. 

 Augusta, Va., manganese, 263. 

 Auriferous beach sands, 240. 



Gravels, 243-248. 

 Austin, Nev., 232. 



Antimony, 259. 



Austinville, Va , zinc mines, 282. 

 Bachelor Mountain, near Creede, 



Colo., 2U9. 

 Baker Co., Orp., 239, 240. 

 Bald Butte Co.'s mines, Mont., 221. 

 Baltimore, Md , chromite, 261. 

 Banded structure of veins, 35. 

 Bannack City, Mont., 219. 

 Banner district, Boise Co., Idaho, 



223. 



Bare Hills, Md., chromite mine, 261. 

 Barton Hill iron mines, N. Y., 121. 

 Barus, C., experiments on electrical 

 activity of veins, 40, 41. 



Experiments on the Comstock 



Lode, 235. 



Bassick mine, Colo., 35, 36, 213. 

 Batesville, Ark., manganese, 265, 266. 

 Bauxite, 258. 



Beach sands, form of ore body, 58. 

 Bear Lake Co. , Idaho, 223. 

 Beaver Co., Utah, 225. 

 Beaverhead Co., Mont., 219. 

 Becker, G. F.. precious metals in dia- 

 base, 25. 



Cited on Steamboat Springs, Nev., 

 32. 



On the Comstock Lode, 233-237. 



On California gravels, 247. 



On California mercury, 267-269. 



Various metals in granite, 26. 

 Beds, in sedimentary rocks, 10. 

 Belmont, Nev., 231,*232. 

 Belts of ore deposits in the West,275> 



276. 



Berks Co., Penn., iron mines, 125. 

 Bernalillo Co., N. M., 204. 

 Bertha zinc mines, Wythe Co., Va.,, 

 172. 



