496 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
has been driven into the phonolite in a westerly direction from the east side. A 
vein which is reported to have given fair assays was encountered 450 feet from the 
portal; in the face the fresh phonolite contains seams of brown jasper inclosing 
purple fluorite. Several prospect shafts have been sunk near the southern edge 
of the phonolite, and some of them have penetrated into the underlying rhyolite. 
In the space between Grouse Hill, Straub Mountain, and the town of Victor 
the granite contains many phonolite dikes, on a number of which prospecting 
has been done. Some of them yielded fair assays and one contained galena, 
but nothing of permanent value has been found. 
LOWER CRIPPLE CREEK. 
The rapidly deepening canyon of Cripple Creek extends southwest from the 
city of the same name, first through Cripple Creek granite and lower down through 
Pikes Peak granite. The slopes and uplands on the west side are practically barren. 
At the junction of Arequa Gulch with Cripple Creek, forming the extreme point 
of Beacon Hill, some evidences of mineralization are seen. The Newell tunnel is 
driven from Arequa Gulch into Grouse Hill; 1,000 feet from the portal a vein is 
reported to have been cut which has been drifted on for 600 feet north and south. 
It appears to follow a phonolite dike and some paying ore is reported to have been 
found, as well as a considerable amount of low grade. The ore contains a little 
galena. The property is owned by the Buffalo and Cripple Creek Gold Mining 
Company. 
One mile farther down the canyon and 34 miles from Cripple Creek a phonolite 
dike, called the Gold Watch vein, crops on the west side in the granite. Early in 
1904 some very good ore was encountered in this dike near the surface. 
About 6 miles down the canyon from Cripple Creek, just outside of the area 
shown on the map, some evidences of mineralization of a different kind are met. 
The elevation is here about 7,700 feet. Outcrops of narrow veins occur on the 
precipitous bluffs of granite and on the summit of the plateau on both sides, about 
2,000 feet above the creek. A tunnel has been started here by the Big Twenty 
Mining Company, and is intended to penetrate the bluff toward the east, with a 
view to opening the veins cropping high above. 
The granite bears evidence of much shearing and crushing, and is intersected 
by aplite dikes. The veins, which course in various directions, are narrow zones 
of sheeting carrying in places a little pale-purple or green fluorite and in one case, 
on the western bluff, tabular crystals of barite. The croppings are said to contain 
gold values of low grade. It is by no means certain that these veins are of the 
same age as those of Cripple Creek. They may possibly be considerably older. 
