-100-

ton; and zine 16 per cent,

The mineralization is dependant upon the distribution
and extent of the limestone, and as the formation strikes 30
degrees to 45 degrees south of east it is well exposed in the
southern wall of the cirque. It is clear in both places that
the limestone dips north and that there are a number of oe
folds, The two higher pockets on the spur occur in the bases of
synclines, and the limestone in the main belt may also be ina
syncline. Mineral deposits occur only in a small part of the
total amount of limestone,

The galena-silver mineral deposits occupy shear or
fracture zones that bear no relationship to bedding planes in
the rock. There are three zones: one is at the crest of the
cirque wall at 5,600 feet, strikes about 80 degrees east of
north and dips south about 55 degrees; another, at 5,700 few,
strikes about east-west and dips north 50 to 60 degrees; a third,
at 5,500 feet, strikes about east-west and dips north at 70
degrees, The last two are not important since they are only
slightly mineralized.

The main fracture zone is mineralized with galena,
sphalerite, pyrite, tetrahedrite, and chalcopyrite. The deposit
has a maximum width of about 18 inches. Surface showings and
three adits driven into the wall of the cirque show that the
deposit narrows toward the west and at depth; it has a maximum
width of only 5 inches in a distance of 38 feet in No. 1 tunnel
at 5,420 feet. A continuation of this deposit may Occur on the
east wall of the cirque where a mineralized zone shows up
directly on the projection of the strike of the deposit. As
seen from the top of the cirque on both sides the zone (or zones)
appears to pinch out downward and there is no evidence of it in

the exposed rocks in the base of the cirque. It would appear,