INDEX. 



301 



United States, general geology, 7-10. 



General topography, 6, 7. 

 Uralitization in the rocks of the Corn- 

 stock Lode, 236. 

 Utah, antimony, 259. 

 Copper, 152. 

 Geology, 224. 

 Lead-silver ores, 192-196. 

 Limonite, 79. 

 Magnetite, 128. 

 Silver mines, 275. 

 Triassic copper ores, 154. 

 Vadose circulations, 283. 

 Van Diest, P. H., on Boulder Co., 



Colo., 214. 



Van Dyck, F. C., analysis by, 177. 

 Van Hise, C. R., cited on replace- 

 ment, 33. 

 On the Marquette district, 101, 



102. 

 On the Penokee Gogebic district, 



Lake Superior, 109. 

 Veins, methods of filling, 28. 

 Verde River, Ariz., 151. 

 Vermilion district, Lake Superior, 



110. 

 Vermilion Lake iron ores, origin of, 



60, 61. 

 Vermont, copper ores, 134, 135. 



Limonite, 80. 

 Vershire, Vt., mines of pyrite, 131. 



Chalcopyrite, 134. 

 Virginia, Clinton ore, 94. 



Limonite or brown hematite, 77, 



82. 



Louisa Co., pyrite, 131. 

 Magnetite, 125. 

 Manganese, 263. 

 Titaniferous ores, 281. 

 Wythe Co., zinc and lead, 172. 

 Virginia City, Mont., 219. 

 Von Herder, on filling of veins, 28. 

 Von Richthofen, on the Comstock 



Lode, 233-236. 

 Vuggs of a vein, 35. 

 Wadsworth, M E., on the Marquette 



district, 101, 102. 

 On Silver Islet, 202. 

 On the classification of ore de- 

 posits, 278. 



Origin of the ores, 104. 

 Wagon Wheel Gap, Colo., 209. 

 Wall rock of veins, precipitating in- 

 fluence of, 31. 



Wardner, Idaho, lead-silver ores, 192. 

 Warren or Bisbee copper district, 



Arizona, 148. 



Wasatch Mountains, 9, 224. 

 Washington Co., Mo., lead and zinc 

 mines, 165. 



Washington, geology, 238. 



Washoe Co., Nev., 232. 



Webb City, Mo., zinc and lead mines 



near, 166-171. 

 Webster, Jackson Co., N. C., nickel, 



271. 



Weed, W. H., cited on siliceous sin- 

 ters, 57. 



Weissenbach, Von, scheme of clas- 

 sification of ore deposits, 44. 

 Wells, H. L.. on sperrylite, 272. 

 Wendt, A. F., on Arizona copper 



mines, 147. 



West port, N. Y., iron mines, 120. 

 West Virginia, Clinton ore, 94. 

 Oriskany, red hematite, 98. 

 Spathic ores, 88. 

 Wet Mountain Valley, Custer Co., 



Colo., 212. 

 Wheatley lead mine, Pennsylvania, 



157. 



White Pine Co., Nev., 231. 

 Whitney, J. D., cited on Missouri ores, 



118. 



On California gravels, 247. 

 On gold veins, 250. 

 On lead and zinc veins of the 



Mississippi Valley, 163. 

 On Washington Co., Missouri, 



lead and zinc mines, 165. 

 Scheme of classification of ore 



deposits, 48. 

 Wickes, Mont., lead-silver mines, 192, 



220. 

 Williams, J. F., on Arkansas bauxite, 



258. 

 Willow Creek, near Creede, Colo., 



209. 

 Wiltsee, E., on the Half Moon mine, 



Pioche, Nev., 230. 

 Winchell, N. H. and H. V., cited on 



origin of Vermilion Lake iron 



ores, 61. 



Winchell, N. H., cited on the Ver- 

 milion Lake district, 110. 

 Winchell, H. V., on the origin of the 



ore, 111. 



On the Mesabi ores, 113. 

 Winslow, A., on Missouri geology, 



282. 



Winslow, tin, 274. 

 Wisconsin, Clinton ore, Dodge Co., 



92. 



Lead and zinc mines, 161. 

 Menominee district, 107, 108. 

 Penokee-Gogebic district, 108, 



109. 

 Wood River mines, Idaho, lead-silver, 



191, 223. 

 Woods mine, chromite, 261. 



