98

No. 1 ore-body was a large, lenticular mass of heavy sulphide extend-
ing 1,200 feet down the dip. Its greatest strike length on any one level
was 1,500 feet and its greatest width was 250 feet. The northern two-
thirds of the body has a north strike and the southern third a southwest
strike. The upper part of the body was vertical, but lower down it
dipped west at about 70 degrees and near the bottom the angle of dip
was 50 degrees. Everywhere the attitude of the body conformed to the
contact between the amphibolite and the sediments and very closely if not
exactly to the strike and dip of the sediments. The upper part of the
body was the best ore. Downwards the body ended in amphibolite into
which it projected in the form of fairly blunt wedges of low-grade, pyritic
ore. The body lay mainly in the outer part of a silicified zone about 300
feet thick. Silicification of the walls is strong below the level of commercial
ore. The bounding silicified sediments consist mainly of quartz but contain
some sericite, chlorite, biotite, and sulphides. The amphibolite is also some-
what silicified and consists of quartz, sericite, actinolite, chlorite, epidote,
biotite, and sulphides. No. 1 ore-body was made up of several closely
spaced bodies separated by thin bands of silicified argillite or amphi-
bolite.

In order of abundance the ore minerals are pyrite, pyrrhotite,
chalcopyrite, and magnetite. Pyrrhotite was most abundant in the upper
part of the body. Along the amphibolite hanging-wall, curves or rolls in
the shearing were the loci of small ore-shoots containing more than the
ordinary amount of chalcopyrite. Along the foot-wall side the ore, due
to the presence of many, narrow, discontinuous ribbons of argillite, was
commonly somewhat leaner than elsewhere.

Ore-bodies Nos. 2 and 3 lie within the amphibolite a short distance
east of the amphibolite-argillite contact. They lie in a shear zone striking
north and dipping steeply west. Both are steeply inclined. No. 3 out-
crops at the surface where its eastern boundary is a fault dipping at a high
angle to the east. Underground No. 8 body because it is inclined to the
west departs from the fault. It is up to 175 feet wide, 600 feet long,
and extends to a depth of 900 feet. No. 2 ore-body lies east of the easterly
dipping fault and extends down to the fault against which it ends. No. 2
ore-body is up to 175 feet wide and is about 600 feet long. It is the upper
part of No. 3 ore-body, cut off and downthrown by the fault. The move-
ment along the fault has amounted to about 300 feet vertically and 200
feet in a southerly direction.

Wall-rock alteration in the case of Nos. 2 and 3 ore-bodies consists,
almost entirely, of the development of chlorite and the amount of altera-
tion is very slight compared with that connected with ore-bodies lying
along the contact. The ore of Nos. 2 and 3 bodies is characteristically a
dark greenstone schist ribboned with sulphide bands and _ lenses lying
parallel to the shearing. The ore minerals in order of abundance are
pyrrhotite, chalcopyrite, pyrite, and magnetite. The ore averages 2 to 3
per cent copper and is of higher grade than the ore of No. 1 body.
Magnetite is more plentiful than in the ore-bodies at the contact and makes
up about 3 per cent of the ore.