284 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
DEERHORN MINE. 
The Deerhorn mine, which occupies the summit of Globe Hill, is owned by 
the Stratton estate. A considerable quantity of ore has been extracted from the 
property, chiefly from the open cuts, but no exact figures could be obtained. The 
developments comprise several large open cuts underneath which the Globe tunnel 
(elevation of portal about 10,325 feet) extends in many ramifications. The deeper 
developments start from the Deerhorn shaft (elevation of collar about 10,425 feet), 
which is 575 feet deep. Six levels are turned and exploratory drifts extend 600 or 
700 feet' in various directions, chiefly north, south, and west. Level 6, 565 feet 
below the collar, has several long crosscuts in various directions and connects 
with the Plymouth Rock shaft, 650 feet to the southwest; the various drifts and 
crosscuts will aggregate nearly 2 miles. 
The soft oxidized breccia on top of Globe Hill contains small values throughout 
and many smaller shoots and pockets of richer ore. Values of about $5 per ton 
are said to be widely distributed, and parts of the oxidized material would probably 
be suitable for the direct cyanide process without roasting. In the Globe tunnel, 
which throughout traverses the oxidized breccia filled with kaolin and limonite, 
the first 300 feet are reliably reported to average $3 per ton. Some of the seams 
cany up to SI5. A few hundred feet from the portal are old workings, the ore 
of which is said to average SS across a width of 100 feet, while along some fissures 
it will average S30. There are few quartz veins; the numerous seams and veinlets 
appear nonpersistent; occasionally they contain partly decomposed fluorite. Much 
ore was extracted from the large pit 200 feet north of the shaft. The breccia is 
ordinarily entirely decomposed, but a few masses of bluish, less oxidized, rock 
occur; these, however, are said to contain very low values. Seams cut the mass 
in many directions; one system dips 10° to 40° S.; another north-south system is 
vertical. A large mass of this rock is said to average $25 to $30, and connects with 
a smaller shoot on the Globe tunnel level, forming a large body which dips south 
or southwest. The flat seams sometimes cut off the ore. 
The lower levels were not accessible, and no work was being done on them. 
On level 6 a drift running out west-northwest is said to follow a “soft fluorite vein 
20 feet wide.” On the whole the results of the extensive underground exploration 
are said to have been disappointing, though some rich seams are reported from 
various places. The oxidation extends to the bottom level, and is said to be as 
well marked here as near the surface. 
The large masses of gypsum found near the shaft are of particular interest. 
They are mentioned by Penrose in his report and more fully described by T. A. 
Rickard,® who says that at a depth of 240 feet the shaft cuts into a mass of gypsum, 
which continues for about 300 feet to the bottom level. There are at least three 
of these chimneys, ending with narrow points a short distance above level 3; the 
largest is at least 75 feet in diameter near the bottom of the shaft. The gypsum 
is compact, white, and crystalline; it contains grains of pyrites and a little dis¬ 
seminated fluorite, as is well shown on the dump of the shaft. Mr. Rickard says 
that “The surrounding breccia is everywhere traversed by color bands due to 
a Trans. Am. Inst. Min. Eng., vol. 30, 1900, p. 399. 
