INDEX 
T 
503 
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Page. 
Findley mine, veins of, section of, figure showing. 410 
water level in. 240,245,246 
change in, figure showing. 242 
workings of. 408,409 
Findley vein, location and description of. 410 
Finlay, J. R., on Cripple Creek ores. 137 
Fissures. See Lode fissures. 
Flats, description of. 210 
Flat vein, location and description of_ 452,456,462,463-464 
Florence, reduction plants at. 139 
Fluorides, occurrence and derivation of. 218-219 
Fluorine, occurrence of. 190 
origin of. 218-219 
presence of, in vein-forming water. 218-219 
Fluorine mine, description of. 280 
gas in. 269 
location of. 151,280 
minerals in. 121,174 
production of. 280 
rocks in. 30,280 
Fluorite, occurrence of. 3,4,6,47,100,114,122 
passim. 160-493 
Fluorite vein, location and description of. 211,373-374 
Fort Pitt Mining Company, mine of. 281 
Fountain formation, occurrence of. 22 
Fox vein, location and description of. 368,371-372 
Free Coinage Gold Mining Company, mines of... 396,402,403 
Friday mine, production of. 151 
Friday shaft, location and description of. 287 
Frisbee, T. F., development by. 4,131 
G. 
Gabbro, character of. 3 
occu rrence of. 3,55 
Galena, deposition of. 225 
description of. 121 
occurrence of. 4,6,7,114,121, 
169,174-178,184,188,192-194,273,278,280-281,289, 
303-308,311,353,375,414,418,422,428, 443, 464, 495 
oxidation of. 200 
Galena Hill, mines on. 281 
Galena mine, location of. 151,280 
minerals in. 120,178 
production of. 281 
veins of. 281 i 
workings of. 280-281 
Galeta vein, location and description of. 317 
Garfield shaft, rocks in. 382 
Gases, mine, analyses of. 255,259,260 
composition of. 252,254-255 
danger from.- - - 10,253,256 
distribution of. 253-254.260-269 
effects of. 256 
occurrence of. 10.253-254,256-257,258-269 
remedies for. 258 
source of. 10,257-258 
See also particular mines. 
Gee Mima claim, location of. 478 
Geneva mine, description of. 291-292 
location of. 292 
production of. 292 
workings in. 292 
plan showing. 296 
Geological map, of district.. Pocket. 
of district, description of. 18,19 
of Portland mine.. 434 
Geology, account of. 1-2,18-40 
See also particular mines. 
Page. 
Giilett, location of. 281 
mines and prospects near. 281,282-283 
view of. 280 
Gleason shaft, location of. 366 
Globe Hill, geology of. 283-287 
minerals in. 124 
mines on. 5,148,158,284 
oxidation at. 197 
depth of. 7,197 
rocks on. 147,283 
Globe mine, location of. 148 
Globe tunnel, location and description of. 284 
Glockerite, description of. 125 
occurrence of. 114 
Glorietta shaft, location and description of. 412,413,415 
Gneiss, alteration of. 184 
description of. 3,19,48-49 
occurrence of. 1, 
20,23,48,50,271,276-278,291,298,300-301,303-305 
petrology of. 49-50 
types of. 48,50 
Gold, deposition of. 229 
description of. 114-115 
occurrence of. 4,6,114,169 
presence of, in vein-forming water. 223-225 
production of.4,134-135 
See also Tellurides; Calaverite; Sylvanite. 
Gold Bond mine, dike at. 91,92 
Gold Coin mine, description of. 487-494 
dikes in. 35,480,490 
drainage of. 238 
geology of. 490-491 
location of. 5,150 
mill of. 487,488 
minerals in. 121,123 
ore in. 199,207,208,214.491-493 
production of. 150 
veins of, character of. 154,156, 
158,159,161,163,164,168,174.178,179,207,488-493 
view of. 34 
water level in..". 197,234,240,494 
change in. 238,494 
figure showing. 242 
workings in. 151.487.488 
plan showing. 488 
Gold Coin Mining and Leasing Company, mine of.• 487 
Gold deposits, characteristics of. 153 
development of, history off. 4-5,130-134 
distribution of. 5,140,146,147 
enrichment of. 203.204 
mining and milling of.4-5,138-142 
occurrence of, mode of.6,153-168 
oxidation of. 203 
production of. 4,134,135 
structure of. 6,153-168 
tenor of. 6-7 
types of. 6,153 
See also Ores; Ore deposits; Ore shoots; Veins; 
Lode fissures; etc. 
Gold Dollar mine, geology of. 359 
location of. 5,148,358 
minerals in. 118 
ore in. 360-361 
rocks in. 34-35,359 
veins in. 360-361 
workings in. 358 
plan showing. 359 
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