484 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
The specimen of ore analyzed does not represent an extremely altered form 
of the granite, though the biotite is entirely gone. Gold is not estimated, inas¬ 
much as even "2-ounce ore” would contain only 0.006 per cent of the precious 
metal. The occurrence of molybdenum in the ore is noteworthy, the mineral 
molybdenite being apparently almost invariably associated with the telluride ores. 
The bearing of these analyses upon the general subject of the metasomatic changes 
connected with ore deposition has been fully discussed on pages 193 to 195. 
The ore of the breccia commonly occurs in minute veinlets, often showing 
comb structure, and consisting of quartz and fluorite, with pyrite and calaverite. 
Some of the veins contain abundant pyrite, but the abundance of this mineral 
seems to bear no discoverable relation to the richness of the ore. 
The breccia in nearly all parts of the mine, often hundreds of feet from any 
known ore, is abundantly impregnated with pyrite in crystals up to a quarter of 
an inch in diameter. Whereas in the Portland mine the development of pyrite 
in the breccia is usually accompanied by the formation of dolomite, in the Ajax 
country rock the pyrite is associated chiefly with sericite. While it can not be 
said that there has been no carbonization of the breccia in the Ajax mine, yet 
none of the thin sections examined contain noticeable quantities of carbonates. 
Oxidized ores are not a prominent feature in the Ajax mine. Even on the 
125-foot level the oxidation is only partial and on the 400-foot level it is scarcely 
noticeable. 
DEAD PINE MINE. 
INTRODLTCTION. 
The Dead Pine mine, owned by the Ophir Mining and Milling Company, is 
situated on the south slope of Battle Mountain, between the Ajax and Gold Coin 
mines. The workings are confined to the Dead Pine claim, which runs about 
N. 6° E., following the general course of the norther’y continuation of the Coin 
lode. In 1894 the Dead Pine was a mere prospect and received only casual men¬ 
tion in Penrose’s report.® Between 1894 and 1896, however, an inclined shaft 
was sunk on the northern part of the claim and some rich ore stoped in the granite 
near the granite-breccia contact. Later the vertical Oliver shaft was put down 
and is now the main shaft of the mine. 
UNDERGROUND DEVELOPMENT. 
The Oliver shaft is situated 285 feet from the south end of the claim and is 
about 900 feet deep. It is connected with levels at 250, 525, 625, 725, and 825 
feet below the collar. The old Dead Pine incline, 425 feet from the north end of 
the claim, follows the contact between the granite and the breccia, which dips 
70° N. There are ten levels connected with this incline, approximately 50 feet 
apart. The old Dead Pine levels 5 and 9 are connected with the main 250-foot 
and 525-foot levels, respectively. At the south end of the property is another 
inclined shaft connecting with four levels. The second of these is continuous 
with the 250-foot level of the Oliver shaft and is the only level common to all three 
shafts. 
a Mining geology of the Cripple Creek district, Colorado: Sixteenth Ann. Rept. U. S. Geol. Survey, pt. 2, 1895, p. 209. 
