MATANUSKA AND TALKEETNA BASINS. 125 
At an elevation approximating 3,000 feet a tunnel has been run 350 
feet S. 80° W. into the mountain, a direction nearly at right angles to 
ts trend. A drift from a point near the end of the tunnel was driven 
L50 feet to the south and 90 feet to the north, along a zone character- 
ized by intense slickensiding or shearing in a nearly vertical direction. 
A short distance beyond this zone a fault dipping 35° W. was observed. 
Such a dip would not interfere with the continuation of the ore in 
depth. 
Chalcopyrite ore accompanied by pyrrhotite and pyrite with much 
quartz has been deposited along the zone of shearing disclosed by the 
drifts. Irregular masses as thick as 2 feet were observed, but their 
horizontal linear extension was short, the vein fluctuating between 
6 inches and 2 feet in thickness. At the south end of the drift the 
vein was narrow, and at the north end the face did not disclose ore. 
It was reported that gulches cutting the mountain north and south of 
the tunnel showed no signs of copper. Stripping, hewever, had not 
been done. 
A thousand feet below the entrance of the upper tunnel an adit is 
being driven to catch the ore in depth. A length of 800 feet has now 
been completed. A rough estimate shows that with continued ver- 
tical dip the shear zone w^ould be reached within a distance of 2,000 
feet from the mouth of the adit. 
