MINERALOGY OF THE FISSURE FILLINGS. 
173 
The following very carefully made determinations of the metallic contents of 
rich ores should be added: 
Partial analyses of ores from Cripple Creelc. 
i. 
• 2. 
3. 
Gold. 
0.35 
0.0506 
0.060 
Silver. 
None or trace. 
.0075 
.0103 
Copper. 
.03 
.0059 
.0070 
Lead. 
o.l8 
Bismuth. 
.0025 
Molybdenum. 
.018 
.0015 
.0018 
Tellurium. 
.0742 
.092 
Tellurium dioxide. 
.36 
a From another sample of same class of ore. 
1. Oxidized ore from 100-foot level of Stratton’s Independence mine. Analyst, W. F. Ilillebrand. Mine assays give 107 
ounces gold per ton. 
2. Telluride ore, El Paso mine. Au and Mo determined on 100 g.; Te on 50 g. Analyst, W. F. Ilillebrand. Results of 
assays: 2.19 to 2.07 ounces Ag, 14.53 to 15.60 ounces Au, per ton. 
3. Similar ore, El Paso mine. Analyst, W. F. Hillebrand. Results of assays: 2.87 to 3.00 ounces Ag, 17.75 to 19.63 ounces 
Au, per ton. 
xVccording to Mr. G. D. Doveton,® the ores as prepared for shipment have a 
composition within the limits indicated in the following table: 
Si0 2 . 60 -70 
A1 2 O s . 16 -23 
CaO. 1 - 5 
MgO. 0.1- 0. 3 
BaO. 0. 0- 0. 25 
Fe. 1.5-10 
S... 1.5- 5 
Limits of composition of Cripple Creek ores. 
Mn. 
Cu. 
Te. 
Zn. 
As. 
FI. 
Na.,0+K. 2 0. 
Pb. 
0 . 0 - 
Zb 
The maxima given for copper and arsenic occur very rarely. 
TIIE FISSURE FIEEENGS. 
0 . 0 - . 10 
0.0- 2. 5 
Trace- . 01 
0 . 0 - .1 
0.0- 2. 5 
0 . 0 - 10.0 
4.0-12.0 
MINERALOGY. 
The most abundant mineral in the fissure fillings or veins is quartz. It is in 
nearly all cases associated with fluorite, whose purple color often renders it more 
conspicuous than the quartz, even when the latter predominates. Much of the 
so-called fluorite, or “purple quartz,” of the veins, such as occurs in great abundance 
in the Blue Bird vein and in the Black or Work vein of the Mary McKinney mine, is 
ji finely crystalline aggregate of both minerals. The relative abundance of the 
quartz and fluorite varies greatly in different lodes and even in different parts of the 
same lode. Dolomite, though not present in all of the veins, is in many places an 
important gangue mineral. It is especially abundant in the Hidden Treasure and 
other veins in the northern part of the Portland mine and in the Vindicator, Mary 
McKinney, and Last Dollar mines. 
a Min. Jour. (London), December 23,1905. 
13001—No. 54—06-13 
