178 GEOLOGY OF ASPEN MINING DISTRICT, COLORADO. 
Highland Light shatt—The Highland Light shaft goes down through the 
Weber shale and crosses the Silver fault into the blue limestone. A small 
amount of ore has been taken out. 
Hannibal mine——The Hannibal shaft, which is directly east of the Little 
Rule tunnel, on the opposite side of the Sarah Jane fault, passed through 
approximately 200 feet of porphyry and a small amount of shale to the 
Silver fault below, where it encountered the blue limestone horizon, here 
almost entirely altered to brown ‘‘short” dolomite. At the bottom of the 
shaft ore occurs in what appears to be the Contact fault, or at the intersec- 
tion of some more steeply dipping fractured zone with the fault. The ore 
zone is locally as much as 8 or 10 feet wide, and the pay streaks occur in 
shoots and chimneys in this zone. On the west side the ore has been cut 
off by a slight fault, which strikes north and south and dips 80 degrees to 
the east. This fault is probably auxiliary to the Sarah Jane. 
Jay Gould mine —The Jay Gould shaft passes through a small amount of 
shale into blue limestone which is irregularly dolomized and stained brown. 
At the bottom a drift runs northwest parallel to a slip in the rocks. This 
drift is partly in blue limestone and partly im dolomite, which probably 
results from alteration of the limestone. The workings show a considerable 
amount of the alteration which usually attends mineralization, such as the 
replacement of the lime in the rock by silica and the presence of crystal- 
lized calcite, but no pay ore has been found. 
Buckhorn No. 2 mine——The Buckhorn No. 2 has a shaft about 200 feet deep, 
which cuts the Contact fault about 75 feet from the collar. Ore is present 
in considerable amount in the Contact fault, on the west side of the shaft. 
This ore runs high in lead and baryta, and does not contain as much siliea 
as does that of some adjoining mines. Where most of the ore has been 
removed a slight synclinal basin is exposed. 
Long John shaft The Long John shaft is probably about 260 feet deep, 
and at this depth cuts the Silver fault. There is some ore in the Contact 
fault between the shale and the blue limestone. 
Adelaide shatt——The Adelaide shaft is 250 feet deep, and is mostly in 
altered, silicified, and dolomized rock which belongs to the Leadville for- 
mation. The workings are chiefly on the Contact fault, but no ore has 
been developed. It is a peculiarity of the rock in these mines, however, 
and in the neighboring mines, that while there has been no great minerali- 
