SMUGGLER MOUNTAIN. 193 
BUSHWHACKER MINE. 
The Bushwhacker mine lies next north of the Della S., along the 
Cowenhoven tunnel. The nature of the Silver fault is the same in this 
mine as in the Della, since it has solid dolomite on the east side, with 
shale on the west. Between the shale and the dolomite is a brecciated 
zone which is very thick, so that the solid shale has hardly been cut in 
the whole workings below the shaft. This breccia contains shale and 
porphyry, with large bowlders and slabs of blue limestone, but most of it 
is so ground up and altered that its original nature is not discernible. A 
dike of porphyry cuts across the northern end of the mine, as seen in the 
lower levels. From here it passes up through the Park-Regent, appearing 
on nearly every level. It has a width of from 2 to 20 feet and a dip of 
60 degrees or-less to the northeast, thus cutting up through the Leadville 
dolomite to the Silver fault. There are no developments to show whether 
it is continuous through the breccia of the Silver fault into the shale 
beyond, but, so far as has been seen, it appears to be faulted with the 
inclosing rock, for, on approaching the fault, it becomes squeezed and 
slickensided, and angular fragments of it are found embedded in decom- 
posed limestone. 
There are two main ore shoots in the Bushwhacker, as pointed out by 
the manager, Mr. Bulkley. These shoots are parallel. One reaches from 
the first to the third level, and is continuous north and south to the Park- 
Regent on one side and to the Della on the other; the second is along the 
sixth and seventh levels, and the two come together and disappear in | 
the Park-Regent workings. Along these zones the stopes go up vertically 
for 40 or 50 feet, both the dolomite below the Silver fault and the 
ground-up material of the breccia being mineralized. Mr. Bulkley pointed 
out that both shoots are marked by slight faults which cause an offset to 
the west on the lower side, so that a kind of bench is made along the 
Silver fault; and it is along this bench that ore has been formed. The ore 
of these two shoots, however, was not exactly alike, the lower one being 
almost entirely a high-grade, heavy spar ore, containing much gray 
copper, while the upper one contained very little barite and carried much 
lead and some zine. Besides the two most important ore channels there 
are several shorter ones, one or two of which have a northwest trend, 
MON XXXI——13 
