201

The Weber group of claims occurs in massive, unaltered Cache Creek
limestone south of Osilinka River near Wasi Creek, and contains galena,
pyrite, and barite in a strong, northwesterly trending fracture zone.

The Davies group of claims, 3 miles east of the Weber group, includes
fissure vein and low-grade irregular replacement deposits of sphalerite,
with lesser galena and pyrite, close to faults in relatively massive limestone
believed to be part of the lower limestone member of the Cache Creek
group.

Metallic mineral deposits that are not of the distinctive lead-silver
type are rare in the Tenakihi, Ingenika, or Cache Creek group rocks distant
from igneous contacts. One such deposit is on the Burden group of claims,
due east of the Ferguson deposit. The Burden showing is in talcose
sericitic schists, and consists essentially of a large quartz vein sparsely
mineralized with chalcopyrite. Another deposit is found on the east side
of Pelly Creek Valley, near the north boundary of the map-area, where
a shear zone up to 12 feet wide in brecciated limestone contains much
pyrrhotite, with lesser amounts of pyrite, chalcopyrite, and bornite.

Deposits APPARENTLY RELATED TO THE OMINECA INTRUSIONS

Evidence of mineralization is widespread in the upper parts of the
late Paleozoic formations, in the Takla group rocks, and in the Omineca
intrusions, and all of it appears to have some genetic connection with these
intrusions. Several metallic mineral deposits are found along the eastern
margin of the Hogem batholith, and almost all other known deposits are
found close to or along the contacts of small intrusive bodies, which,
presumably, were emplaced during the main period of intrusion.

A few deposits are found along shear zones in the intrusive bodies
themselves. Types of deposits range from disseminated minerals in the
pre-batholithic rocks to simple, fissure-filling quartz veins,

The Hogem batholith contains many shear zones mineralized with
pyrite and copper sulphides, but most of such deposits carry no appreciable
content of the precious metals. One of the largest of these mineralized
shear zones occurs at the head of the east fork of Matetlo Creek. There,
closely spaced fractures form a permeable, mineralized zone at least 120
feet wide in medium-grained granodiorite. The fractured rock is sparsely
but uniformly mineralized with pyrite, chalcopyrite, and bornite. The
zone also contains five veins, 2 to 10 inches wide, composed almost entirely
of pyrite and chalcopyrite.

Small quartz veins in sheared quartz diorite exposed in the canyon on
Haha Creek contain a little free gold.

The complex of sedimentary and volcanic rocks cut by small intrusive
bodies along the west border of the map-area between Mesilinka River and
Lay Creek contains several heavily pyritized bands up to 1,000 feet wide
and several miles long. These bands traverse rocks of several types, but
are commonly centred around a diorite dyke or sill. One of the pyritized
bands of this type exposed at the Granite Basin workings contains minute
amounts of chalcopyrite, tetrahedrite(?), and magnetite, and is reported to
carry up to $ ounce gold a ton across a width of 30 feet.