172 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
Chemical analyses of Cripple Creek ores. 
1. 
II. 
III. 
IV. 
V. 
VI. 
VII. 
Silica. 
57.81 
54.91 
54.68 
55.98 
59.12 
56.70 
59.58 
'Alumina. 
20.13 
17.80 
17.87 
17.09 
18. 77 
19.35 
16.00 
Iron. 
4.80 
5.30 
3. 44 
3.38 
4.20 
Magnesia. 
.86 
.36 
.20 
.47 
.32 
.37 
.03 
Lime. 
1.32 
2.04 
2. 65 
.71 
.38 
2.03 
Alkalies. 
10.53 
12.00 
12.00 
13.97 
12.91 
Manganese dioxide. 
.31 
.66 
.94 
Barvta. 
.22 
I 
. 11 
Titanium dioxide. 
.66 
1 
.75 
Copper. 
.0064 
Trace. 
Trace. 
Lead. 
.0071 
Trace. 
Zinc. 
.60 
.64 
Arsenic. 
.0944 
i 
Tellurium. 
.0152 
Trace. 
Trace. 
. 10 
Molybdenum. 
.0368 
.01 
Sulphur. 
2. 49 
2. 25 
1. 77 
1.23 
4. 75 
Carbon dioxide. 
2.00 
.26 
Fluorite. 
.68 
1. 42 
Pyrite. 
2.50 
. 4. 78 
Barium sulphate. 
. 18 
.24 
Combined water. 
.93 
. 50 
. 81 
1 
I. Ore beds of United States Reduction and Refining Company, Standard mill, Colorado City, February, 1904. 
II. O re bed 91, Portland mill, Colorado City. Average silver one-fourth ounce per ton. 
III. Ore bed 91b, Portland mill, Colorado City. Average silver one-fourth ounce per ton. 
IV. Golden Cycle ore, 300 tons. Analysts, Von Schulz & Son. Gold 0.98 ounce, silver 0.62 ounce per ton. 
V. Golden Cycle ore, 600 tons. Analysts, Von Schulz & Son. Gold 1.52 ounces, silver 1.04 ounces per ton. 
VI. Specimen Moose ore. Analyst, F. C. Knight. Gold 12.24 ounces, silver 6.70 ounces per ton. 
VII. Granite ore, Ajax mine. Analyst, W. F. Hillebrand. 
'Analysis I represents mixed ores, oxidized to some extent and derived both 
from breccia and from latite-phonolite. Analyses II and III represent the normal 
ore from the Portland mine, largely in breccia country rock and slightly oxidized. 
Analyses IV and V show average Golden Cycle ore, largely from veins in breccia 
and mostly oxidized. These analyses substantiate the statement made that the 
ores, speaking approximately, have the same composition as the country rock, the 
only notable exception being the granite ore, which is very low in silica compared 
to the unaltered rock. The amount of pyrite varies from 2 to 5 per cent, the 
latter figure being rarely exceeded in the average composition. Fluorite is always 
present, but the amount is not often more than 2 per cent and is commonly much 
less. One or two per cent of carbon dioxide is ordinarily present. Copper, lead, 
zinc, and molybdenum, with arsenic and antimony, are present in most cases, 
but the quantities are insignificant. Bismuth and vanadium have been found in 
ores from Stratton’s Independence mine. 
