502 
INDEX. 
Page. 
East veins, location and description of. 371, 
392,393,452-453,456,462,463,471,474 
section of, figure showing. 390 
East Victor vein, location and description of. 388,392 
East-West dike, location and description of. 485,486 
Eclipse mine, gas in. 260 
water level in. 240,244 
change in, figure showing. 242 
Economic mill, process in, description of. 142 
Edwards shaft, character of. 394 
E. F. C. prospect, location and description of. 282 
Elevations, data on. 12-13,147 
Elizabeth Cooper claim, location of. 314 
workings on.315,317 
Elkhorn mine, location and character of. 271 
production of. 151 
Elkton Consolidated Mining and Milling Company, 
mines of. 331 
Elkton mine, description of. 331-341 
dikes in. 335-336 
plan showing. 332 
drainage of. 10,237-238,242-244 
fissures in, plan showing. 332 
gas in. 254-255,260 
analysis of. 255 
geology of. 333-336 
history of. 331 
location of. 5,148 
metasomatism in. 193 
minerals in. 116,120,126,175,177,181 
ore of. 206,209,211,213,336-341,462 
plan of. 338 
production of. . . 148,331 
rocks in.'....26,30 
section of, figure showing. 333 
tree trunk in. * . 31 
valuation of. 144 
veins of, cavity in, figure showing. 178 
character of.. 157,164,166,174,177-178,332-333,336-339 
section of, figure showing. 178 
view of. 332 
water level in. 240,341 
change in. 237-238,242-244,248,249 
figure showing. 242 
relation of El Paso tunnel and, figure showing.. 236 
workings of. 151,331-332 
Elkton-Raven mine, dikes in..-. 36 
El Paso Consolidated Gold Mining Comoany, mines of. 349 
El Paso dike, description of. 159,350 
location of, figure showing. 350 
water behind.,. 249 
El Paso Gold King mine. See Gold King mine. 
El Paso mine, description of. 349-354 
dikes in. 159 
flooding of. 249 
gas in. 254,262 
geology of. 350-351 
history of. 349 
location of. 5,148,349 
minerals in. 115,118,120,121,122,124,175,176,177,178 
ore of. 170-171,203,209,353-354 
analyses of. 173 
production of. 349 
rocks in. 34 
sorting at. 137 
veins of, character of. 159,165,166,235,351-353 
section of, figure showing. 209 
view of. 350 
Page. 
El Paso mine, water level in. 241 
water level in, change in. 249 
figure showing. 242 
workings of. 151,349-351 
plan showing. 350 
section of, figure showing. 351 
El Paso tunnel, drainage by. 4, 
9-10,133,235-238,243,245,246,249,329 
gas in.:. 262 
relation of, to water level in Elkton mine, diagram 
showing. 236 
El Paso vein, location and description of. 159, 
165,166,235,351-352,353-354 
section of, figure showing. 209 
Emerson vein, location and description of. 158, 
159,165,452-453,462-463, 464 
Emma vein. See Empire vein. 
Emmonsite, analysis of. 119 
description of. 118-119 
occurrence of. 4,114,289,343 
Empire No. 2 vein, location and description of. 164, 
166,212,393-395 
production of. 394 
workings on. 394 
Empire State Gold Mining Company, mine of. 395 
Empire State mine, ore from, photomicrograph of.... 186 
production of.*. 395 
veins of. 149,393-395,396 
workings of. 396 
English companies, misfortunes of. 145 
Enrichment, secondary, description of. 204 
Epidote, occurrence of. 55,72,73,86,185,192 
E. Porter Gold King mine, description of.3(fe-306 
rocks in. 34 
veins in. 294,306 
Epsomite, description of. 126 
occurrence of. 4,114 
origin of.,. 201 
Erosion, effects of. 36,38,39-40 
Eureka claim, location of. 358 
Evans, R. T., work of. 11 
Excelsior vein, location and description of. 309,312 
F. 
Fannie B. claim, location of. 349 
Faulting, occurrence of. 165-167 
Fault vein, character of. 165-166,294 
figure showing. 293 
, location of. 294 
Favorite mine, dike in. 381 
production of. 380 
vein of. 382 
Feldspar, occurrence of. 59,72-73,89,169 
Femay, William, development at. 131 
Field work, extent of. 1 
Financial conditions, statement of. 5,143-146 
; Findley Gold Mining Company, mine of. 409 
Findley mine, description of. 409-412 
gas in. 260 
geology in. 156, 409 
location of. 5,408, 409 
minerals in. 120,175,176 
ore in. 
production of.. 
rocks in.. 
section of, figure showing 
veins of. 
figure showing. 
.212,213,411-412 
. 409 
. 33,34,381 
. 410 
163,166,179,383,410-411,424 
. 410 
