280 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
one place the granite contains disseminated secondary fluorite. The overlying 
breccia is locally converted to a soft yellowish-white kaolin rock. The principal 
shaft is 200 feet deep and sunk through 150 feet of dark-brown, fresh breccia. At 
that depth the granite was met, the sharp contact dipping 45° W. and showing a 
hummocky surface covered with clay. Near the contact the breccia contains seams 
and disseminated grains of calcite. Some good assays are reported from the upper 
part of the shaft. 
The Metallic tunnel is located at an elevation of 9,250 feet on the western slope 
of Rhyolite Mountain. It is 1,000 feet long and reported to be entirely in granite. 
Farther north, on Bernhard Creek, some prospecting operations have been carried 
on along phonolite dikes in granite. 
FLUORINE MINE. 
The Fluorine mine, owned by the Montreal Gold Mining and Milling Company, 
is situated halfway up the southern slope of Copper Mountain. It is now leased 
bj r the Sioux Falls and Cripple Creek Gold Mining Company, who have recently 
built a 100-ton cyanide mill to treat the ore. The mine is of interest as being the 
northernmost producer of the camp. The total production could not be definitely 
learned, but it is probably near $160,000. The workings consist of several shallow 
shafts and a tunnel 200 feet in length. The stoping from the tunnel reached nearly 
to the surface, and the roof has recently caved in, leaving a large open chamber. 
The mine is situated practically on the contact of phonolite, breccia, and 
granite. The phonolite overlies the breccia, which in turn lies flatly on the granite. 
The breccia is not extensive just at this point, however, and pinches out in the 
farthest workings, leaving the phonolite resting on the granite. The different rocks in 
the mine appear to have contained much pyrite, but are now completely oxidized. 
The breccia is rather granitic and contains numerous large granite fragments. 
Rich pockets were found in the breccia, and were mined out. At the present 
time practically the whole of the breccia and some of the granite in the mine is 
being taken out and treated by cyaniding without roasting. The value of the ore 
now mined ranges from $4 per ton up. In a pit on the eastern part of the claim 
some rhodochrosite with argentiferous galena and zinc blende was found in spaces 
of dissolution in the granite. A tunnel driven underneath the Fluorine mine is 
entirely in granite and failed to find ore. 
The Copper Mountain mine, situated just east of the Fluorine, shipped some 
ore in 1898, but the amount was not ascertained. It is developed by a shaft 200 
feet deep and drifts extending in a northwesterly direction on a vein in phonolite 
containing pyrite, galena, and zinc blende, with fluorite gangue. 
RED MOUNTAIN. 
GALENA MINE. 
The Galena mine, located on the slope of Red Mountain toward Spring Creek, 
is the only place in the area west and northwest of Cripple Creek where any notable 
amount of ore has been found. The mine is owned by the Iron Mountain Mining 
and Milling Company and is developed by an incline shaft 560 feet deep, extending 
