264 
INDEX. 
Page. 
Silver Lake mine, lode ores of 94 
manner of working - - -- • 156 
ore of , value of -- 102,156 
ore transportation at... 40 
Silver Ledge mine, description of 247-248 
Silver Link mine, description of 198-199 
sheeted structure near, view showing- 50 
Silver Queen mine (Bear Creek), descrip- 
tion of 199 
ore in, occurrence of -. 97 
Silver Queen mine (Placer Gulch), de- 
scription of - 181-182 
Silver Wing mine, description of 175-176 
Silver ton, view of 13 
Silverton series, extent and character of. 32 
Smelters, erection of - 22-23 
Sound Democrat mine, description of ... 182 
Specularite. See Hematite. 
Spencer. A. C. , photograph by -. 200 
reference to 55,64 
Sphalerite, change from galena to 10ft 
occurrence and character of 81 
Spherulitic structure in lode ores.. 91-92 
Steiger, G. , analysis by 125 
Stelzner lode, description of 158 
vein-quartz structure in, plate show- 
ing 70 
Stelzner vein, description of . 154-155 
Stibnite, occurrence and character of ^ . . 82 
Stock eruptions, extent and character of . 33 
Stock ores, change in, with depth .111-112 
character and structure of 109-111 
value of.... .112-113 
See also Stock and lode ores; Ore de- 
posits. 
Stock and lode ores, origin of .132-141 
paragenesis of 131-132 
Stocks, distribution of 104 
definition and general description of . 103-104 
Stokes, H. N, analyses by.. 122,127 
quoted 78 
reference to.. ■__ 77 
Stress, tangential, as cause of fissures 64-65 
Stress, torsional, as a cause of fissures ... 65-66 
Strike fractures parallel with lode, occur- 
rence of 59 
Stromeyerite, occurrence and character 
of... 79 
Structure of lode ores 87-93 
of lodes 67-70 
Sulphobismuthites, occurrence and char- 
acter of ... 83-85 
Sultan Mountain, lode ores of 94 
mines of 251-254 
Sunnyside Basin, lode ores of 95 
lodes of 176-179 
Sunnyside Extension mine, description 
of 180-181 
ore from, value of 102 
Sunnyside lode, description of 176-177 
vein-quartz structure in, plate show- 
ing 7(1 
Sunnyside mine, cross section of No 
Name lode 88 
description of . 176-178 
Page. 
Sunnyside mine, fissures at, course of 49 
ore in, distribution of 97 
Sunset mine, description of... 189 
Syracuse Pride mine, description of 188-1 89 
Tangential stress as a cause of fissures .. 64-65 
Telluride conglomerate, extent and char- 
acter of 36 
Telluride quadrangle, fissures in, direc- 
tion of 46 
fissures' in, origin of 03 
Assuring and faulting in 56 
Tellurides, occurrence and character of. _ 85 
Terry, J. H., reference to 176 
Tetrahedrite, occurrence and character 
of 78-79 
Thomas, W. H., information furnished 
by 98,163 
reference to _ 252 
Titusville mine, description of 161 
Toltec lode, de.-cription of . 183 
Tom Moore lode, description of 174-175 
Tomboy mine, description of.. 206-211 
lode ore in, value of ... 102-103 
ore in, occurrence of 97-98 
Tomboy and Iron lodes, cross section of 209. 210 
Topography of Silverton quadrangle ... 23-29 
Torsional stress as a cause of fissures 65-66 
Tower, G. W., and Emmons, S. P., cited . . 44 
Treasure Mountain, fissiires on. cour e of 49 
Treasure Mountain and Placer Gulch, 
lodes of 179-185 
Tungsten ore, deposits of 256 
U. S. Depository lode, ore in, effect of 
depth on 99 
U. S. Depository mine, description of . . . 204-205 
Uncompahgre Canyon, lodes of 196-199 
sheeted structure in, view showing.. 50 
Uncompahgre Chief mine, description 
of 186-187 
ore in, effect of depth on 99 
Uncompahgre River, fissures along, 
course of. 50 
Van Hise, C. R., cited . 60, 10!), 133, 136, 137, 138, 139 
Van Hise,C.R., and Hoskins,L. M., cited. 62 
Vegetation in Silverton quadrangle 26 
Vein, definition of 43 
Veins. See also Fissures. 
Vein-quartz structure, plates showing. . . 72 
Volcanic rocks, formations underlying .. 34-36 
original thickness of 60-61 
Volcanism, evidences of presence of 133 
Walsh, T.F., reference to 200,204 
Water, analysis of, from spring near Gus 
ton mine 114 
Water, ground, discussion of . 141 
Waters, meteoric, action of, in ore deposi- 
tion 133-134 
Webster mine, description of 240 
Weed, W. EL, cited 132,1:56.1)0 
Wewissa mine, description of 189 
Whale vein, description of.. 213 
Whale-Rochester vein. See New York 
City vein. 
Wheel of Fortune mine, description of__ 205 
Wheeler, R. , reference to 209 
