80

silicified, sheared zone is 18 inches wide and carries about 3 per cent of
arsenopyrite with a sparse dissemination of galena and sphalerite. An
18-inch channel sample taken across the zone in this cut assayed: gold,
0-165 ounce a ton; silver, 2-10 ounces a ton.

Mamie Group (54)

References: Ann. Repts., Minister of Mines, B.C.: 1917, p. 113; 1919, p. 103; 1921,
p. 107; 1922, p. 107; 1923, p. 108; 1924, p. 96; 1934, p. C7; 1935, p. C35. B.C.
Dept. of Mines, Bull. No. 1, 1932, p. 32. Geol. Surv., Canada, Sum. Rept. 1925,
pt. A, p. 132; Ec. Geol. Ser. No. 4, 1927, p. 40.

This property, owned by the estate of J. Aldrich, is on the southwest
slope of Hudson Bay Mountain, 7 miles due west of Smithers. It is reached
by a branch trail half a mile in length from the Duthie mine camp, which
is connected by a 15-mile motor road with Smithers. The Mamie group
consists of the Myrtle, Iron King, Dome Extension, Florence, Evinrude,
and Mamie claims. The Mamie “vein” outcrops on the last-named
claim and extends northeasterly up the mountain towards the adjoining
Evinrude claim.

Prior to 1919 the Mamie “ vein” was developed by surface stripping,
open-cuts, and a 20-foot shaft. An option was obtained in 1919 by
J. R. Turner for J. F. Duthie, and early in 1920 an adit was driven 125
feet along the Mamie “vein” at elevation 4,427 feet. During 1922 the
drift was continued to 165 feet and two winzes, 50 feet apart, were sunk
to depths of 25 and 17 feet, respectively. An adit was started from the
Henderson Creek gorge at elevation 3,840 feet, 587 feet below the upper
adit. This adit, designed to intersect the Mamie vein 950 feet from the
portal, was driven 200 feet before work ceased. During 1923 Duthie
Mines started a new adit along the strike of the Mamie vein 154 feet
below the upper adit. The Federal Mining and Smelting Company, which
held a 55 per cent interest in Duthie holdings in 1934, continued this adit
to about 660 feet to a position nearly below the No. 1 winze of the upper
adit. In 1934, W. R. Wilson and Sons obtained an option. The upper
adit was extended to a total length of 240 feet and some surface work
was done.

Massive, finely crystalline tuffs and andesite flow breccias containing
fragments over an inch in diameter, form the country rock in the vicinity
of the “vein”. These rocks range from dark grey to light grey, and
adjoining the “ vein” have been altered and bleached.

The “vein” is a sheared zone carrying sphalerite and arsenopyrite
with a little chalcopyrite and, rarely, some galena. Parts of the zone are
brecciated and consist of small, angular rock fragments cemented by and
partly replaced by the sulphides.

The zone strikes north 65 degrees east and dips about 80 degrees
southeast. It is exposed by stripping for 300 feet along its strike up an
18-degree slope between elevations of 4,444 and 4,540 feet. In this distance
it ranges from 2 to 8 feet in width. At the lower end it carries more than
50 per cent of sulphides across 7 feet. About 120 feet northeast it consists
of 12 inches of greyish white quartz containing 10 per cent of arsenopyrite