506 
INDEX. 
Page. 
Isabella trachydolerite, composition of 
description of. 
occurrence of. 
petrology of.. 
Ithaca tunnel, location of. 
. 91-93 
. 91 
91,381,383,390,396-397 
. 91-92 
. 478 
J. 
Jack G. claim, location of. 314 
Jackpot claim, location of. 314 
shaft on. 315 
Jackpot vein, character of.166,318,319-320 
oxidation of. 163 
Jackson shaft, location and description of. 288, 
367-368,370-371 
Jaquith, A. C., on mine drainage. 10,248 
Jaquith and Countryman, on El Paso tunnel. 237 
Jaycox shaft location of. 305 
Jeff Davis mine, location and description of. 288 
Jefferson mine, description of. 292-295 
location of. 292 
production of. 292 
veins in. 294 
workings in. 292 j 
plan showing. 295 
Jefferson Mining Company, mine of—. 292 
Jennie Sample mine, dike in. 93 
rocks of, analysis of. 95 
Jerry Johnson mine, location of. * 149 
ore bodies in. 210 
production of. 288 
veins in. 166,288 
workings of. 288 
Jerry Johnson Mining Company, mine of. 288 
Jerry Johnson vein, character of. 288 
Joe Dandy mine, description of. 345 
veins in, character of. 206,345 
John A. Logan mine, coal in. 31 
dike in. 372,381 
gas in. 261,380 
location of. 5,149 
rocks in. 32 
water level in. 240,244 
change in, figure showing. 242 j 
workings in. 380 
Johnson, Fred, data from. 261 
J oily Tar claim, location of. 478 
June Blizzard claim, location of. 478 
Kalagoorlite, description of. 116 
Kaolin, description of. 128-129 
occurrence of. 72,86,114,128,170,199,282,283, 
285,287,347,366,369,, 372,374,391,398,400 
origin of. 170,201 
Katinka mine, description of. 330 
minerals in. 120 
Kentucky Belle claim, location of.. 341 
Kentucky Bill claim, location of. 331 
Keystone vein, character of. 307,308 
King shaft. See Glorietta shaft. 
Kittie M. vein. See Matoa vein. 
Klondike vein, location and description of. 156, 
391,392,393,404 
Knight, F. C., analyses by. 118,202 
Knowlton, F. H., fossil determined by. 31 
Krennerite, description of. 116 
Page. 
Krennerite, occurrence of. 4,114,175 
Kurie, F. M., data from. 431 
Kurtz vein, location and description of. 475-476 
L. 
La Bella shaft, location of. v . 426 
La Bella vein, location and description of. 160, 
417-418.422.424.427,428.429 
structure of, figure showing. 160 
Labor, conditions of. 5,142-143 
Labradorite, description of. 127 
occurrence of. 103,114 
Lantishie claim, location of... 314 
Last Chance claim, location and description of. 287 
Last Dollar Gold Mining Company, mines of. 374 
Last Dollar mine, description of. 374-377 
gas in. 254,261 
geology of. 374 
location of. 6.149,374 
metasomatism in. 188,190 
minerals in... 116,120,121,122,124,125,126,188,200.375-377 
ore of. 170,174,375 
photomicrographs of. 180 
oxidation in. 198 
production of. 374 
rocks in. 32,85 
temperatures in. 270 
veins in, character of..... 157,163,173,177,374,375-377,382 
figure showing. 161,376 
water level in. 240,242,245 
change in, figure showing. 242 
workings of. 374,438 
Last Dollar vein, location and description of. 374-377 
Latite-phonolite, abundancy of.. Ill 
alteration of. v . 184,189-191 
analyses of.. 69,79,104,189 
area covered by. 110 
composition of. 57,69,79-83 
definition of. 68-70 
description of. 68-71 
eruptions of. 24 
fissures in. 159 
' intrusions of. 32-34 
minerals in. 81,83 
occurrence of. 2, 
3.21,32-34,70,98-99,291,309,311. passim 362-495 
origin of. 56 
petrology of. 71-77 
photomicrographs of.1. 82 
texture of. 78 
trachytic facies of. 77-78 
analysis of. 79 
transition of, to phonolite. 83-84 
Laura Lee mine, location and description of. 271 
minerals in. 115,271 
Lavenite, description of. 64-65 
occurrence of. 65 
Lead, occurrence of. 225 
Lead ores, occurrence of. 169,172,286 
value of. 170 
Lead vein, character of. 174,302,303 
Lead-zinc veins, occurrence and description of. 182 
Leasing, prevalence of. 5,134,143 
Le Clair claim, location of. 322 
ore of. 210-211 
Le Clair vein, location and description of_ 322,324,326-328 
Lee, H. A., on mine gas. 259 
