48 REPORT OF THE MINISTER OF MINES, 1929.

“Banded vein” at about 500 feet vertically below the surface outcrops. This tunnel was driven -
1,160 feet, with two short crosscuts north and south. With assistance from the Department of
Mines, the McGrath Mountain trail was considerably improved during the season.

The formation of the area is a folded complex of tuffs, coarse breccias, and bands of argillite,
intruded by lamprophyre dykes and an augite-porphyrite stock. The veins occupy brecciated
and sheared fault-planes in, or close to, the argillite inclusions in the augite porphyrite and
frequently in the neighbourhood of small dykes. An irregularity of dip, and particularly of
strike, features the yein system. Generally, however, the trend is between north-east and
slightly west of north, with a comparatively flat northerly dip.

Surface-trenching and open-cuts have exposed several brecciated shear-zones yarying from
18 inches to about 20 feet in width. Mineralization consists chiefly of zinc-blende, with minor
quantities of pyrite and occasionally some galena, in a gangue of quartz and calcite veinlets and
inclusions of country-rock. Mineralization is lenticular and bunchy, but where it does occur is
well pronounced. Sufficient surface work has not been done to enable a criterion to be formed
of ore-shoot lengths. The limited amount of surface work, the yarying strikes and dips, and

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the probability of much faulting do not allow of any definite correlation of the veins exposed in
the different cuts.

To ascertain the general metal tenor of the ore-shoots to be expected, the following samples
were taken: Across a vein 3 feet wide outcropping in the right bank of Sunrise creek at altitude
8,525; this assayed: Gold, trace; silver, 0.6 oz. to the ton; lead, nil; zine, 26 per cent.
: A sample representing 2 feet of the best mineralization on the hanging-wall of a vein 4.5 feet
» wide at altitude 3,650 feet assayed: Gold, 0.02 oz. to the ton; silver, 3.5 oz. to the ton;
28 per cent; antimony, nil.

In the course of driving the crosscut tunnel at altitude 3,200 feet, veins were cut at 175 and
Bb 400 feet in respectively. These are quite probably the extension of the Sunrise Creek outcrops
ae at altitude 3,520 and 3,650 feet. It was estimated that the “Banded yein” should have been
intersected at about 1,000 feet in. Unfortunately surface work on this vein has in no place

zinc,