CONTENTS. 
IX 
Chapter XIII.—Underground gases and temperature—Continued. Page. 
Subterranean gases—Continued. 
Origin of the gas. 257 
Remedial measures. 258 
Carbon dioxide and nitrogen in other mining districts. 258 
Detailed observations at Cripple Creek mines. 260 
Eastern part of the district. 260 
Eclipse mine. 260 
Elkton mine. 260 
Moose mine. 260 
Last Dollar mine. 261 
Modoc mine.,.. 261 
Blue Bird mine. 261 
Wild Horse mine. 261 
Logan and Orpha May mines. 261 
Doctor-Jackpot mine. 261 
El Paso and C. K. & N. mines. 262 
Pointer and Mint mines. 262 
Poverty Gulch. 262 
Conundrum mine. 262 
Ophelia tunnel. 269 
Copper Mountain. 269 
Underground temperature. 269 
Part II.—Detailed Descriptions of Mines. 
Chapter I.—Mines north and east of the town of Cripple Creek. 271 
Mineral Hill. 271 
Carbonate Hill. 271 
Poverty Gulch. 271 
C. O. D. mine. 272 
Prospects near the C. O. D. 272 
Gold King mine. 273 
Mollie Kathleen mine. 274 
Gold Pass dike. 275 
Abe Lincoln mine.*. 276 
Introduction. 276 
Underground development. 276 
Geological features. 276 
Lode systems. 277 
Character of ore. 278 
Pay shoots and lode structure. 278 
Underground water. 279 
Rhyolite Mountain. 279 
Geological features. 279 
Prospects on Rhyolite Mountain. 279 
Fluorine mine. 280 
Red Mountain.. 280 
Galena mine. 280 
Area between Cameron and Gillett. 281 
Geological features. 281 
Sunshine mine. 281 
Deposits near Gillett. 282 
