INDEX. 
263 
Page. 
Placer Gulch, fissures in, course of 49-50, 52 
lode ores of 95 
Placer Gulch and Treasure Mountain, 
lodes of 179-185 
Polar Star lode, andesitic rock] from, min- 
eral composition of 130 
metamorphism near .. 119-124 
Polar Star mine, description of 187-188 
latite from, analysis of - 122 
ore in, effect of depth on 99 
wall rock from, mineral composition 
of 123 
Polybasite, occurrence and character of. 82 
Porphyry, intrusions of 33-34 
Porphyry, monzonitic, analyses of 127 
mineral composition of - 129 
Porphyry Gulch, fissures near, course of. 50 
Potosi series, extent and character of 32 33 
Poughkeepsie Gulch, lode ores of 95 
lodes of --- 191-196 
■ • • "i 
mining in - 
Poughkeepsie mine, description of 194 
Pride of the Rockies mine, description of 1 82 
Pride of the West mine, description of _ L69 170 
Proustite, occurrence and character of.. 
Purington, C. W., cited »•. 
46, 54, 56, 70, 73, 91, 200, 20* 
quoted -- .- 63,206-207 
reference to ^ 
Pyrite, occurrence and character of — 7' W 
plate showing - 86 
Quartz, occurrence and character of 70-7] 
Queen Anne mine, description of 257 
Raymond, R. W., cited 194 
Red Cloud mine, description of 185 186 
marcasite from • s 
ore from, plate showing structure ol 
Red Creek, view of :!s 
Red Mountain. metamorphism near l:.'i 131 
mines at, view of 38 
rise and decline of 22 
silver near, discovery of 22 
stocks near h'4 
topography near 
Red Mountain district, mine water in, 
character of 113 
mining claims in, map of 105 
ore deposits of 211 251 
Red Rogers claim, description of 196 
Replacement deposits, discussion of .. . II! L43 
Red and Bonita mine, description of... 256 261 
Reusch, H., cited 234 
Revenue tunnel, ore transportation in, . 40 
Rhodochrosite, occurrence and character 
of. 73 
Rhodonite, occurrence and character of. 75 
Richmond Basin, fissures in, course of. .. 50 
Rickard,T. A., cited.. 19,181,215 
Ridgway lode, course of 171 
ore from, plate showing 72 
Ridgway mine, description of 172-173 
fault fissure at 57-58 
lode ores of 95 
Rock, A.M., aid by 13 
Rock structure, relation of fissures to 53-55 
Page. 
Robinson , J. , ore body discovered by 215 
Robinson mine, description of ... 220-221 
Robinson and Guston mines, underground 
workings of, plan of — 224 
Ross Basin lodes, description of 257 
Royal Tiger mine, description of 159-160 
lode ores of 94 
Royal vein, description of 154-155 
Ruby silver. See Proustite. 
St. Paul mine, description of 238-239 
San Juan breccia, sheeted structure in, 
view showing 50 
San Juan Chief mine, description of 187 
fissui*es at, intersection of 57 
San Juan formation, extent and charac- 
terof... 31 
San Juan Queen mine, description of 183 
San Juan region, historical sketch of 19-25 
literature on 14-18 
San Juan volcanic area, extent and char- 
acter of 29 30 
San Miguel conglomerate, use of name . 36 
Saratoga mine, description of 240-244 
replacement of limestone by ore at .. 142 
sections through 242, 243 
Savage Basin. lodes of.. 206 214 
Saxon mine, description of 195 
Schulz,< >. J., acknowledgments to 14 
cite£ 228 
Schwarz,T.E., acknowledgments to 11 
cited... 79,80, 103, II". 137,216,220,228,332,236 
information furnished by... 218 
quoted. 218 219,233 
reference to.. 221 
Scotia lode, description of 182 
Scotia mine, fissures at, course of . 19 
Secondary enrichmenl of ore bodies, dis- 
cussion of 136-148 
Seven Thirty lode, description of 19t> 
Silver, average annual price of 24 
occurri nee and character of 86 
silver, ruby. See Proustite. 
silver Bell mine, description of 236 238 
kobellite from, analysis of 237 
section through 237 
Silver Crown lode, sketch section of 63 
Silver Lake, lodes west of, projection of . 51 
Silver Lake Basin, country rock of 115 119 
lode ores of 91 
fissures in..... 44-45 
course of 48 
general features of 145-146 
lode ore in, value of 102 
lodes of 145-161 
mining claims in, plat of 14t> 
Silver Lake lode, description of 150-153 
ore distribution of 97 
movements within 151-152 
sketch section across 152 
Silver Lake mine, country rock near, 
character of 117-118 
cross section of New York City lode 
of 67 
description of 149-157 
fault fissure at 57 
