SMUGGLER MOUNTAIN. 185 
conclusion that the ore bodies of the Smuggler and of the Gibson were 
originally the same. At various points throughout the mine there are local 
formations of ore, which consist mostly of wire silver that has formed in the 
interstices of a breccia. These ore deposits, like some already described, 
are evidently of secondary origin, later than the main ore deposition. 
Pl. XLI, C, is a-geological section of the Mollie Gibson, made through 
the working shaft on an east-west plane. This illustrates the following 
features, which have already been described: First, the formation of the 
Silver fault, which separates the Weber shales from the Leadville dolomite; 
second, the development of the Della system of faults, which displaced the 
Silver fault with the surrounding formations and effected a general offset 
to the west on the lower or north side; third, the deposition of ore, which 
took place mostly at the intersection of the Silver fault with the later faults 
of the Della system; fourth, a movement nearly along the plane of the 
Silver fault, which, however, assumed locally a slightly different plane. 
This movement sometimes apparently coincides with the Silver fault, but 
ordinarily is more nearly vertical, and this has cut off the faults of the 
Della system and the ore which occurs along them. Thus the Gibson and 
the Emma faults are represented as cut off on the west side by this move- 
ment and as thrown down with the rock formations. The Smuggler fault 
at the extreme lower left-hand corner of the section was probably origi- 
nally continuous with the Gibson, while the continuation of the Emma 
fault may well have been the Della, which is not represented in the section, 
but which lies below the Smuggler fault at about the same distance that 
the Emma lies below the Gibson. 
SMUGGLER MINE. 
In the Smuggler mine the zone which is usually followed for ore is, as 
in the case of the Mollie Gibson, the Silver fault, which separates the shale 
on the west from the dolomite on the east side. There is always a zone 
of fractured material along this fault, and generally parallel slips with 
polished and striated surfaces in the harder rock on each side. There is no 
blue limestone in place in the Smuggler, the east wall of the Silver fault 
being always dolomite. On the upper levels the dolomite is characteristic 
“brown lime,” yellowish brown in color, and very closely jointed, or 
“short.” In the upper levels, also, the shale is soft. In the deeper levels, 
