COPEEM SIE) Bile VEINS“OP TELKWA DISTRICE, 363

to the east, and a smaller one outcrops 30 feet below the tunnel
and on the east side.

Structure.—The tuffs here are folded into a low anticline with
dips of about 20 degrees, and a plunge to the south of about 8 de-
grees. Almost on the axial plain of the fold the beds are rup-
tured along an irregular fissure, and it is in this that the mineral
has been deposited.

This vein is exposed at intervals from the top of the cliff down
to the edge of a glacier below, but owing to the thin deposit of
soil cannot be traced along the surface of the plain. About 20
feet above the glacier the tunnel penetrates the cliff for about 20
feet along the vein. A few tons of ore were extracted from the
tunnel, and samples taken from the ore dump assayed: gold, 0.03
Oza silver, 27.0 OZ. ; Copper 16.6 per cent Phe vein varies from
I inch to 12 inches in width with a general vertical dip. In places
on the outcrop it breaks up into a number of lenses separated
from one another and only roughly following a linear arrange-
ment. What appears to be on offshot of the main vein can be
traced for 30 feet up the cliff above the tunnel to the west of the
main vein, and has a dip to the east of about 70 degrees. The
walls of the vein are sharply defined and little changed.

The Ore.—The ore consists of almost pure chalcocite in a
gangue of quartz; the only other minerals which can be seen in
the hand specimen are a little native silver, hematite associated
with epidote, calcite, and a very small amount of malachite,
azurite and laumontite. The chalcocite appears to be equal to or
even to exceed the amount of quartz, and gives the ore a white
silvery appearance which to the eye suggests much higher values
than the assays give.

In general the ore is massive, and has an even medium-grained
texture, but in places comb structure becomes evident. In other
places the quartz forms small rosettes of radiating euhedral crys-
tals. The epidote is confined to a narrow band along the east
wall about an inch in width and to much smaller veinlets pene-
trating the more central parts of the vein. The hematite is
closely associated with the epidote.

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