26

quartz veinlets and replaced by chalcopyrite. The breccia zone contains
up to 10 per cent chalcopyrite. The foot-wall is amygdaloidal and porphy-
ritic andesite, the hanging-wall a fine-grained, grey andesite. The flows
and ore zone strike north 45 degrees west and dip 40 degrees north.
Farther northwest the continuation of the deposit is concealed by a talus
cover, and is probably interrupted by a granite dyke that cuts across its
strike 100 feet to the northwest. About 225 feet to the southeast there is a
second pit 8 feet wide across the same zone, but there sulphides are less
plentiful, there being less than 3 per cent of chalcopyrite. Fifty feet north-
east of the latter pit a second brecciated zone 8 inches wide follows a flow
contact striking south 45 degrees east and dipping 35 degrees northeast.
The breccia is replaced by a little chalcopyrite. This vein is exposed in
another pit 150 feet southeast, where it is 2 feet wide and contains up
to 10 per cent chalcopyrite. The deposits may be related to a stock of
granodiorite that lies 60 feet southeast of the last-mentioned pit on the
strike of the ore zone.

A representative sample taken from the pit near the stock assayed:
gold, a trace; silver, 0-46 ounce a ton; copper, 7:30 per cent. At the first-
mentioned trench, where the mineral zone is 12 feet wide, a representative
sample assayed: gold, a trace; silver, 0:20 ounce a ton; copper, 5:96 per
cent.

About 500 feet east of the granodiorite stock mentioned above, an 18-
inch quartz vein outcrops on the mountain top. This vein strikes south 10
degrees east and dips 35 to 50 degrees east. It has been traced by a half
dozen pits for over 750 feet in a southeast direction down the north fork
slope of the mountain between elevations of 5,100 and 4,900 feet. At 525
feet southeast along the vein a 15-foot, vertical dyke of quartz albite cuts
across it, and south of the dyke the vein appears to be offset 40 feet to the
north. A small talus slide hides the vein from view in the neighbourhood of
the dyke. In a wide open-cut on the vein 170 feet southeast of the dyke
the vein quartz is 14 inches wide and carries up to 5 per cent chalcopyrite.
The hanging-wall is sheared and altered over a width of 15 feet, and the
altered andesite carries a sparse distribution of chalcopyrite. Farther
southeast the ground is very precipitous, but the vein appears to continue
down the steep slope.

A 14-inch channel sample taken across the quartz vein at the wide
open-cut assayed: gold, a trace; silver, 0-30 ounce a ton; copper, 3-12 per
cent. At the same place a chip sample taken across 12 feet of the altered
and mineralized hanging-wall assayed: gold, a trace; silver, 0:16 ounce
a ton; copper, 0°78 per cent. Another channel sample across 12 inches of
mineralized vein quartz 100 feet northwest of the quartz-albite dyke
assayed: gold, a trace; silver, 0-16 ounce a ton; copper, 1:06 per cent. A
representative sample taken at the northwest end of the vein on the summit
assayed: gold, a trace; silver, 0-16 ounce a ton; copper, 0-88 per cent.

Galena Group (17)

The galena group of three claims is on the south side of the north fork
of Chimdemash creek and adjoins the east boundary of the Silver Mitts
group. It is part of the consolidated group of twenty claims, the Butte