160 GEOLOGY OF ASPEN MINING DISTRICT, COLORADO. 
Princess Louise and Hidden Treasure——T he Princess Louise shaft is situated in 
Spar Gulch, near its junction with Copper Gulch, and ‘he Hidden Treasure 
is near by, in Copper Gulch. Both these workings are now abandoned. 
The Princess Louise started in the Silurian dolomite and went down into 
the Cambrian quartzite. It is said that a small quantity of ore was mined 
in the Cambrian quartzite at a distance of about 60 feet below the contact 
with the Silurian. The ore carried silver, and occurred along nearly 
vertical east-west fractures in the quartzite. The chief interest which 
pertains to this shaft is the fact that ore has occurred here in the Cambrian 
quartzite, although in small quantity. 
WEST SIDE OF ASPEN MOUNTAIN. 
On the west side of the Aspen Mountain syncline there are a number 
of workings, chiefly tunnels, some of which are very extensive. These 
usually find some ore along the vertical north-south faults, especially in 
the chief ones—the Saddle Rock and the Pride. 
New York tunne.—T'he New York tunnel is one of the longest of these 
workings. It runs south into the hill, so that it cuts across the formations 
and reveals successively lower strata. The first 500 feet is in the shale 
which overlies the porphyry, the second 500 in the porphyry itself, and 
then about 100 feet in the shale which underlies the porphyry. At this 
point the Cambrian quartzite is reached by crossing the Saddle Rock fault, 
and is continued in for about 285 feet to the granite below. 
Great Western tunnel— The Great Western tunnel starts in the hillside above 
the New York. It passes through a few feet of the shale which overlies 
the porphyry, and then continues in porphyry to near the end, where it 
cuts a little shale and crosses the Saddle Rock fault into the granite. 
Pioneer tunnel— I'he Pioneer tunnel starts on the hillside on about the 
same level as the New York tunnel, but farther to the west, and like it, 
runs south into the hill. After passing through a slight thickness of glacial 
drift, it goes through 330 feet of shale, 50 feet of porphyry, and 230 feet 
of shale, then crosses into the blue limestone, of which there is about, 75 
feet, to the Saddle Rock fault, and crosses this fault into granite. 
Gatenatunnel-—The Galena tunnel starts in dolomite in the block 
between the Saddle Rock and the Pride faults, and runs west, slightly 
