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49

Both zones occur along faults of marked displacement. The gangue
minerals are chiefly hornblende, actinolite, chlorite, and quartz, with a
little carbonate. Where faulting has caused much brecciation of the
wall-rock the granodiorite fragments have been altered and replaced by
the gangue and by metallic minerals. The widths of the ore shoots are
determined by the amount of brecciation or shearing of the wall-rocks
along the fault fissures. The metallic minerals are principally chalcopyrite,
pyrite, and magnetite, and the ore carries small amounts of gold and silver.

At elevation 5,700 feet an adit has been driven north 45 degrees west
along a fissured zone that dips 80 degrees north. The adit is now caved
at the portal and the vein is concealed by talus. At elevation 5,875 feet,
about 310 feet up the slope, a second adit has been driven north 45 degrees
west. The portal of this adit is also blocked by a cave-in and the zone is
hidden by talus. The main adit, at elevation 6,050 feet, about 350 feet
farther up the slope has been driven 300 feet along the zone, with a 17-foot
crosscut to the northeast and a 9-foot crosscut to the southwest from the
end of the drift. In the adit the zone has an average strike of north
54 degrees west and dips 70 degrees north. At the portal a width of
4 feet of the granodiorite is traversed by ten parallel fractures with a
sparse dissemination of chalcopyrite throughout, but the middle 18 inches

- is well mineralized, carrying up to 10 per cent of pyrite and chalcopyrite
with a little magnetite. Thirty feet within the adit the vein pinches,
and no further sulphides are seen until a 5-inch seam of almost solid
pyrite, with some chalcopyrite, comes in on the south wall 70 feet from
the portal. For the next 15 feet the vein strengthens, and between 87 and
105 feet from the portal the roof is stoped out for 10 to 15 feet up.
At 100 feet from the portal a winze is reported by O’Neill (1919) to have
been sunk for 30 feet. “In 12 inches of ore throughout this depth; at the
bottom of the winze the ore was 12 inches wide at the east side and 26
inches wide at the west side, all of high grade”.

This winze is now ice filled the year around. For 40 feet west of the
winze the fissure traverses a lamprophyre dyke, and throughout this rock
there is no vein filling. For the next 150 feet west, from the dyke to the
crosscut, the fissured zone ranges from 3 inches to 2 feet in width and
carries ore minerals for most of that distance. There is a stope from 114
to 131 feet from the portal. At the face of the drift, 300 feet from the
portal, the zone is cut off by a cross fault that strikes northeast and dips
55 degrees northwest. The continuation west of the fault lies to the
southwest.

Above the adit the fissured zone is followed by several large open-cuts,
to an elevation of 6,400 feet where it crosses the precipitous peak and
cannot be followed. In one rock cut at elevation 6,340 feet, 500 feet west
of the portal of the adit, the zone is 2 feet wide. It is much oxidized and
leached at the surface, but much massive chalcopyrite shows in the bottom
of the cut. The chalcopyrite is banded by seams of coarsely crystalline
black magnetite and contains pyritohedral pyrite crystals up to 1 inch
in diameter. Twenty feet west of this cut, a branch fissure joins the main
vein. The branch fissure carries up to 24 inches of solid sulphides, chiefly
chalcopyrite, for a distance of 30 feet from the main vein. Other exposures