SMUGGLER MOUNTAIN. IS) 
closely set together, so that the tunnel had to be lagged in order to stand. 
Just before reaching this highly fractured zone, the uppermost beds of the 
Parting Quartzite come into the tunnel. On the other side of this zone, 
however, no Parting Quartzite is found, but only hard blue dolomite. 
Since this fault has probably, like the others, an offset to the west on the 
north side, the dolomite is Silurian; and this is confirmed by a crosscut to 
the west on the north side of the fractured zone, which shows the Parting 
Quartzite, considerably altered, abutting against the shale on the other side 
of the Silver fault. The horizontal shift along this fractured zone, which is 
called the Alta fault, may be approximated at 100 feet. From this point 
north for some distance the Silver fault separates the Weber shale from the 
Silurian dolomite. 
The ore in the Alta Argent appears to lie between two of the north- 
west-southeast faults which have been described as existing in the southern 
part of the mine, and is found both in the dolomite and in the shale. It 
contains considerable barite, and crisscross spar is frequent. There is also 
much native silver. . 
SMUGGLER MOUNTAIN MINING. MAP. 
The Smuggler Mountain map presents no areas of complication except 
along a narrow zone in the vicinity of the Silver fault. The Della and the 
Smuggler faults outcrop only in the northeastern corner of the district, but 
their dip is very slightly steeper than the slope of the hill, and they are 
found, therefore, in all the workings from the Regent to the Mollie Gibson. 
In the southern part of the district the Clark fault causes complications. 
According to the explanation which has already been presented, the Clark 
fault faults the Della 5S. system so that the Della and Smuggler faults are 
upthrust on the east side. Thus the Gibson fault, which belongs to the 
Della system, is brought close to the surface and locally outcrops, but as 
its dip is still slightly steeper than the slope of the hill this outcrop is 
extremely limited, being cut off both to the north and to the south by the 
Clark fault. The Gibson fault, on the other hand, cuts off the Silver fault, 
as do all the faults of this system. For some distance north of the Smug- 
gler mine the Silver fault does not appear in outcrop, being cut off by the 
Clark fault. As the throw of the Clark fault diminishes, the line of junc- 
tion with the Silver fault comes nearer the surface, until it crops, as shown 
