INDEX. 



291 



Ely copper mines, Vermont, 134, 135. 



Emma mine, Utah, 194. 



Emmons, E., on Adirondack titanif- 



erous ores, 280. 



Emmons, S. F., cited on replacement, 

 33. 



On Butte, Mont., 137. 



On country rock of Boulder Co. , 

 Colo., 214. 



On Leadville, Colo., 183-185. 



On Red Mountain, Colo., 190. 



On the mines near Rosita, Colo., 



213. 

 Endlich. F. M., on gold mines near 



Ouray, Colo., 206. 

 Enterprise, Miss., spathic ore, 89. 

 Esmeralda Co., Nev., 232. 

 Etta granite knob, with tin ore, 273. 

 Eureka Co., Nev., 232. 



Electrical activity of ore, 235. 



Illustration gossan, 39. 



Lead-silver, 196. 



Evigtok, Greenland, cryolite, 258. 

 Fahlbands denned, 61. 

 Fairplay, Colo., 212, 245. 

 Farish, J. B., illustration by, 20. 



On the veins at Newman Hill, 



near Rico, Colo., 206, 207. 

 Faults, cause of, 13. 



Defined and described, 17-20. 



Hade, 17. 



Normal, 18. 



Reversed, 18. 



Schmidt's law of, 18. 



Step faults, 20. 

 Feather River, Cal., 241. 

 Felch Mountain area and iron ores, 



Michigan, 104. 



Fisher Hill iron mines, New York, 121. 

 Flagstaff mine, Utah, 194. 

 Flagstone iron ore, 87. 

 EJaxseed iron ore, 92. 

 Flotz denned, 43. 

 Floyd Co. (Ga.) bauxite, 258. 

 Flucan of a vein, 37. 

 Foerste, A. F., on Clinton ore, 97. 

 Folds, various kinds defined, 11. 



Axes of, 11. 



Cause of cavities, 13. 



"Pitch "of, 11. 

 Forest of Dean iron mine, New York, 



123. 

 Forest Queen mine, Ruby district, 



Colo., 211. 



Formation defined, 5. 

 Fort Laramie, Wyo., iron ore near, 



114. 



Fossil iron ore, 92. 

 Foster and Whitney, cited on Mar- 

 que tte district, 101. 



Foster and Whitney, Marquette dis- 

 trict, origin of its ores, 104. 



On Keweenaw Point copper, 142. 

 Fouque and Levy cited, 279. 

 Franklin copper mines, Michigan, 



141. 

 Franklin Co. (Mo.) lead and zinc 



mines, 165. 



Franklin Co. (Va.) magnetite, 125. 

 Franklin, N. J., 123. 

 Franklin Furnace, N. J., 174, 175-179. 



Iron mines, 124. 

 Franklinitp, 262. 



Freeland, F. T., cited on faults, 19. 

 Fremont Co. (Colo.) magnetite, 126. 

 Friedensville zinc mines, Penn., 174. 

 Frisco, Utah. 195. 

 Frost drift, North Carolina, 252. 

 Fryer Hill, Leadville, Colo., 183. 

 Fuchs and Le Launay, treatise of, 



284. 

 Fulton, J., on the Menominee district, 



107, 108. 



Gagnon vein, Butte, Mont., 137. 

 Galena (town), S. D., lead-silver 



mines, 191. 

 Gangue minerals forming, 23. 



Source of, 26. 



Gap mine, Lancaster Co., Penn., 270. 

 Gap mine of pyrrhotite, Pennsyl- 

 vania, 131. 

 Gatling arsenic mines, Deloro, Can., 



260. 



Genesee antimony mine, Nevada, 259. 

 Genth, F. A., on Boulder Co., Colo., 

 214. 



On gold in Southern States, 252. 

 Geology, modern standpoints, 3. 



Tabulation of geological subdi- 

 visions, 4, 5. 

 Georgetown, Colo., 214. 

 Georgia, bauxite, 258. 



Clinton ore, 95. 



Limonite, 84. 



Manganese, 263. 



Geyser mine, Custer Co., Colo., 213. 

 Gilbert, G. K., cited on joints, 13. 



Illustration loaned by, 15. 

 Gilpin Co., Colo., 214, 250. 



Banded veins, 35. 



Copper mines, 138. 

 Glendale, Mont., 219. 



Lead- silver ores, 191. 

 Glenmore estate, West Virginia, 98. 

 Globe copper district, Arizona, 150, 



228. 



Gogebic district of Lake Superior, 108. 

 Gold, Alaska, 254, 255. 



Black Hills, 217. 



California, 243-250. 



