508 
INDEX. 
Page. 
Mary McKinley mine, production of. 148 
rocks in. 26,91 i 
sorting at. 137 
section of, figure showing. 325 
temperatures in. 269 j 
veins of, character of. ; . 162, 
163,164,165,166,173,176,178,179,324-328 
plan of. 323 
water level in. 234,240,329-330 
change in. 237,248,329 
figure showing. 242 
workings of. 322 
Mary McKinney veins, location and description of.... 322, 
324,326-328 
Mathews, E. B., on granite. 43,101-102 
Matoa Gold Mining Company, mines of. 292 
Matoa vein, location and description of. 162-166 
292,294-295,297,309,311,312 
Mattie D. claim, location of. 314 
workings on. 315 
Mattie D. vein, location and description of. 164, 
315,317,318,321 
Mattie L. claim, location of. 292 
Mayflower claim, location of. 283,322 
May mine, minerals in. 126 
May Queen claim, location of. 292 
Melonite, description of. 116 
Mercer, D. N., mine of. 402 
Mercer mine, description of. 402-403 
Mercer vein, minerals in. 115 
Metallic tunnel, location and description of. 280 
Metamorphic rocks, classes of. 101 
description and petrology of.3,48-53 
Metasomatism, agencies of. 184,196 
minerals produced by.85-88 
sequence of...».. 195-196 
vein formation and, relations of. 7,184-204 
See also particular mines; Alteration; Oxidation; 
Hydrometamorphism; Water. 
Mica, occurrence of. 73,77,184,185,188,192 
Microcline, description of. 127 
occurrence of. 46, 
47,49,50,72,100,114,193,194,436,442, 447 
Microperthite, occurrence of. 44,46,47,72,193 
Middle vein, location of. 427 . 
Midget Gold Mining Company, mine of,.. 298 
Midget mine, description of. 297-305 
dikes in. 91 
fissures in. 153 
geology of. 300-301 
location of. 5,148,298 
minerals in. 121,192 j 
ore of.:. 158,206.302-305 
production of. 148,298 ! 
relations of Conundrum mine and, figure showing . 300 
rocks in. 25 
veins in, character of. 165,174,177,200,302,304-305 
ventilation of, figure showing. 263 
view of.'. 18 
water level in. 241 
change in, figure showing. 242 
workings in. 298 
plan showing. 299 
Midget vein, location and description of. 298,302-304 
Midland claim, location of. 291 
Milling, stamp, inefficiency of. 138 
Mineral Hill, placers near. 5,152 
ptospects on. 151,271 
Page. 
Mineral Hill, rocks on. 22,97,271 
Mineral Rock shaft, rocks in. 382 
Mineral Rock vein, location and description of. 380, 
382-383, 411 
Minerals, amount of, in solutions. 153 
descriptions of. 114-129,173-175,185-188 
derivation from. 9 
list of. 4 
occurrence of. 114-129,173-176,185-188 
paragenesis of. 175-176 
See also particular mines, tunnels, etc. 
Mines, descriptions of. 271-496 
distribution of. 147-151 
drainage of. 9-10 
gas in. See Gases, mine. 
list of. 5 
production of. 4 
restricted area of. 5 
returns from. 5 
underground workings of. 5 
plans showing.26, Pocket 
ventilation of. 253 
figure showing. 263 
water level in, position of, diagrams showing.... 236,242 
Mining, cost of. 4,137,145 
development of, history of. 130-146 
methods of. 4,135-137 
review of. 5,147-152 
Mining companies, flotation of. 143-144 
Mint mine, description of. 306-308 
gas in. 262 
ore in. 307-308 
rocks in. 26,306 
veins of. 307-308 
workings of. 306 
Mirabilite, description of. 126 
occurrence of. 114 
Mitre Peak, rocks of. 58 
Modoc mine, description of. 378-379 
dikes in. 378,381 
gas in. 261,378 
geology of. 378 
location of. 149,378 
minerals in. 125 
ore of.212,379 
oxidation in. 198 
production of. 378 
veins of. 378-379,382 
water level in. 242,378 
workings of. 378 
Modoc Mining and Milling Company, mine of. 378 
Modoc vein, location and description of. 375,377 
Moflatt vein, character of. 371 
Mohawk Belle mine, description of. 347 
Moissan Henri, analysis by. 257 
Molly Kathleen mine, description of. 274-275 
dikes in. 32,95,274-275 
gas in. 262 
location of. 274 
production of. 151,274 
rocks in. 85 
veins in. 156,157,158,274-275 
workings of. 274 
Molybdenite, deposition of. 225 
description of. 120 
occurrence of. 4,6,114,169,174,176, 
190,191,195,340,375,376,411,414,418,464,473,474 
oxidation of. 200 
