292 



INDEX. 



Page. 



UacNamara mine, gas in 94 



location of 189 



shaft of, depth of 106 



rocks in 189-191 



section on 191 



Magmatic segregations, theory of 21-22 



Map of andesite veins in Mizpah workings 183 



of Ararat Mountain 102 



of Tonopah mining claims 26 



of Tonopah mining district 21,114 



of Tonopah outcropping veins 84 



Map, diagrammatic, showing zigzag scarps 76 



Map, geologic, of Tonopah mining district 56, 114 



Melosira granulata, occurrence of 69-70 



punctata, occurrence of 70 



varians, occurrence of 69 



Mesabi range, sideritein 249 



Metallographic province, extent of 22, 276 



ores of, origin of 276-278 



Mexico, ores of, comparison of Tonopah ores and ... 267-270 



petrographic province of 274-275 



Mica, production of 232-233 



Midway mine, location of 179 



ores of, character of 86, 181 



rocks in 35,179-180 



section in, figure showing 180 



shaft of, depth of 106 



veins of 180-181 



Milling, deficiencies of 28 



Mineral veins. See Veins, mineral. 



Mineralization, agents of 85, 253-264 



origin of 22,258-262 



period of 83,261 



See also Water, hot, ascending. 



Mines, descriptions of 115-206 



plotof 26 



Miocene time, history in 67-69 



Miriam claim, description of 193 



Mizpah Extension shaft, later andesite of, analysis 



of 241,244 



later andesite of, description of 238-239 



study Of 244-245 



lava of, analysis of 57 



location of 194 



rocks in 194-195 



temperatures in 263-264 



diagram showing 265 



veins in 195-197 



water in 106 



Mizpah fault, discovery of : 79 



location of 115,126-127,168-169,177 



Mizpah Hill, alteration on 207 



earlier "r^esite from, analysis of 216, 223, 225 



description of 214-215 



study of 223-225 



erosion on 113-114 



faulting on 74 



gold found at 25-26 



outcropping veins on, view of 116 



rocks on and near 32,110,164 



underground temperatures at 264 



veins of 83 



plan of 120 



view from 46 



Mizpah mine, earlier andesite from, analysis of.. 216, 225,226 



earlier andesite from, description ol 214-215 



study of 225-226 



Page. 



Mizpah mine, faults in, figure showing 122,123 



ores of, character of 86, 132 



rocks of 207 



section in 173 



silver in 95 



veins of, diagram showing 122-124, 126, 183 



Mizpah vein, alterations in 124-125 



branching of 119 



diagram showing 120 



composition of 122-123 



earlier audesite from, analysis of 216,226,226 



description of 215-216 



study of 225-221J 



extent of 115-117 



faults in 115-117 



plan showing 123 



fractures in 119-122 



gold in 124-125 



junction of Burro vein and 127 



minerals of 124 



occurrence of 126, 173-174 



ores of, distribution of, diagram showing 121 



oxidation of 90, 124-125 



relations of, figure showing 173 



sections of, diagram showing 116, 117, 119-124, 173 



structure of 117 



Mizpah vein system, description of 115-129 



Molly shaft, data concerning 106,200 



Monitor Valley, Nev., hot springs in 257 



Mono, Lake, crater at 82, 257 



Montana Tonopah mine, faults in 172 



faults in, plan showing 168 



galena in 88 



gold of 27, 125 



ores of 86, 95, 175 



analysis of 89 



oxidation in 91 



sections in 169,170,171,174,175,176 



shaft of, depth of 106 



later andesite in, analysis of 241,247 



description of 240-241 



study of 247-248 



temperatures in 264 



diagram showing 265 



veins of 85, 167-173 



figures showing 169, 170, 171 



formation of 172 



structure in 169-170 



Montana Tonopah vein system, description of 168-184 



Montana vein, character of 170-172,174 



faults on 172,174 



occurrence of 170, 178 



ore of, figure showing 84, 171 



origin of 172 



relations of, figu re showing 173 



vein of, fragment of, view of 84 



Muscovite, formation and occurrence of 231-233 



Nelhart, Mont., silver sulphides at, comparison of 



Tonopah sulphides and 95 



Nevada, springs of 256-259 



New York Tonopah shaft, depth of 106,200 



location of 200 



rocksin 30,39-10,110,200-201 



New Zealand, rocks of 279-280, 284-286 



Nickel, occurrence of 34 



