by the structure of tho bedded rocks.
A younger andesine granodiorite dyke about 200 feet wide
cuts the vein on the surface and in tho main adit. Offshoots from

the dyke in places follow the vein.

Patmore. The Patmore group, discovered in 1934, covers most of the
north side of the mountain above Knauss creek. In this areca the
rocks are largely argillites, but tuffs are also present anc in
places form beds of considerable thicknesses. The beided rocks are
cut by numerous dykes of albite diorite, some of which are 50 to
200 feet wide. Two or more sills are distinctly visible on the
higher slopes where they extend to the top of the mountain. The
dykes appear to be offset in places by faults.
The albite diorite in places near some of the many veins
occurring in the dykes is completely altered to a light grey rock
that weathers rusty brown due to the decomposition of pyrite and
is traversed by innumerable carbonate-quartz stringers, some of
which follow fissures, whereas others replace the rock.
The veins on the Patmore property are mainly confined to
the diorite dykes, but in places extend a short distance beyond rf
them or follow along their borders. Most of the veins are gash
veins less than 2 feet wide at the maximum and fairly short. Most
of them strike parallel to the dykes, but some crosscut thom. In
the main workings the veins have widths up to 5 feet, are irregular
in strike and in thickness. It is notable that the larger veins a

occur in the lower workings and the smaller veins higher up the

eae eres

mountain, and that well up toward the top of the mountain the
dykes do not appear to carry veins. The alteration: of the
diorite also markedly decreases as the mountain is ascended. The
higher veins are fill fissures and consist of quartz, carbonate,

galena, chalcopyrite, sphalerite, and pyrite. In the lower

workings they are in part replacement bodies. A sample considered