186 GEOLOGY OF ASPEN MINING DISTRICT, COLORADO. 
however, such as the eighth and ninth, which are as yet beyond the reach 
of oxidizing agents, the dolomite is hard and dark blue, with frosty luster, 
and the soft shales change to hard, black, argillaceous limestone. In 
several places there is exposed in the shale near the fault a sheet of 
porphyry, which does not appear to exceed 15 or 20 feet in thickness and 
which lies next to the dolomite. : 
Della fautt—The Della fault is well exposed in the Smuggler mine in 
the third, eighth, and ninth levels, having its usual movement to the west 
on the north or lower side. 
Smuggler fault—The Smuggler fault is shown in the Clark tunnel at the 
northern end of the mine. It is also shown in the tunnel level and in 
the eighth level, running parallel to the Della. 
Emma fault—The Emma fault, which is parallel with the Smuggler and 
the Della, outcrops at the northern end of the Smuggler ‘‘open cut” close 
to the shaft, and is seen in the 40-foot level, where its lower wall forms a 
smooth, polished, striated floor upon which the ore rests. This ore is that 
variety, rich in zine, which is so characteristic of this shoot. 
Clark fault——Several of the parallel slips which belong to the Clark fault 
- system are seen in the open cut of the Smuggler, and also in the Clark 
tunnel. They are nearly vertical in dip and have a north-south trend. 
They have a general upthrow to the east, causing a marked steepening of 
the line between the dolomite and the shale, which goes by the name of the 
“contact.” Through the action of this fault the original ore bodies, as well 
as earlier fault systems, have been displaced. 
Nature of ores—Several varieties of ore are found in the Smuggler. The 
peculiar rich silver ore, made up of polybasite and native silver inclosed — 
in flesh-colored or gray barite, which corresponds to the rich ore in the 
Mollie Gibson, is found in a continuous shoot in the seventh and eighth 
levels south. From this shoot of solid ore broken material was followed 
along the Clark fault, becoming progressively poorer as the distance from 
the main body increased, and finally, as in the case of the Mollie Gibson, 
becoming so low in grade as not to repay working. In the Smugeler, how-. 
ever, the train of crushed ore was followed upward from the main body, 
while in the Gibson it was followed downward. ‘This circumstance, among 
others, goes to show that originally the two bodies were probably one. 
As in the Mollie Gibson, the rich polybasite ore is confined to this one 
