184 GEOLOGY OF ASPEN MINING DISTRICT, COLORADO. 
idealized diagram showing the ore bodies in the Smuggler and in the Mollie 
Gibson, the section being taken along the plane of the Clark fault. Fig. 8 
(see p. 199) gives a diagrammatic representation of the successive stages 
in the history of the rocks as worked out in the Mollie Gibson and Smug- 
gler mines. 
Occurrence of ore in the Mollie Gibson —'"he main ore in the Mollie Gibson occurs 
on the Gibson fault, with dolomite below and shale above. Most of it was 
actually found in the shale, resting on a hard, polished, striated floor of 
dolomite. This ore was of a rich character, having large amounts of poly- 
basite and native silver. In structure it was solid and massive, containing 
the polybasite in regular blotches or small true veins, and the large bodies 
showed banding conformable to the plane of the fault. These phenomena 
show unmistakably that the ore was originally deposited along the fault, 
and there is little evidence of movement since its deposition. The rich 
polybasite body appears to lie in a sort of subordinate shoot, trending south 
of east and lying on the Gibson fault plane. This shoot is marked by 
exceptionally large and rich bodies of a nature not found elsewhere in the 
mine. It is noteworthy that this rich shoot is practically the lower termi- 
nation of the ore on the Gibson fault. Most of the ore below this is native 
silver, which, from the nature of its occurrence, is manifestly a secondary 
deposit leached from the rich ore above. Some of these secondary deposits 
are, however, of considerable size, and empty vugs are often found beauti- 
fully and elaborately festooned with delicate wires of silver. The Gibson 
fault becomes entirely barren a short distance farther down. Above the 
polybasite ore, however, the ore appears to be pretty continuous, but the 
amount of silver becomes less and there appears more lead and zine. Far- 
ther up the zinc has formed in especially large quantities. At the intersec- 
tion of the Gibson and the Clark faults ore has been stoped down for 100 
or 200 feet. This ore was richest close to the main body and became pro- 
gressively poorer with depth. It is a breccia which carries angular frag- 
ments of polybasite and pink spar, such as form the solid body above, and 
there is also a large amount of wire silver, evidently secondary, which has 
formed in the interstices of this breccia. The ore has been followed along 
the fault some distance north also, but isnot found southward. This ocecur- 
rence of ore in the breccia along the Clark fault shows that the movement 
was down and to the north on the west side; and this coincides with the 
