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Silver Chord Group (Locality 163)

References: Annual Report of the Minister of Mines, British Columbia, 1926 and 1927;
Geol. Surv., Canada, Sum. Rept. 1928, pt. A.

The Silver Chord group of four mineral claims is at the north end
of McGrath mountain, on Dak river about 7 miles from Alice Arm. The
cabins and underground workings are about 1,200 feet above sea-level and
about 200 feet above the main Dak River trail.

Development work on the group consists of two drift adits 200 feet
and 600 feet long, respectively.

The country rock consists of argillite and argillaceous quartzite
striking north. The rocks are probably folded into open anticlines and
synclines. Narrow lamprophyre dykes cut the sediments. The known
mineral deposits on the group are two sphalerite-bearing quartz veins. One
of the veins outcrops a short distance above the cabins where it strikes
north and is approximately vertical. One small body of sphalerite ore
about 3 feet wide is exposed but is only 10 feet long. A short adit driven
along the vein shows that the width is variable and the sulphide mineral-
ization extremely sporadic.

The second vein is exposed a few hundred feet west of the cabins.
It strikes north, dips steeply west, and is at least 500 feet long. It consists
of gashes and stringers of quartz and calcite in a zone varying between 1
and 25 feet in width. A narrow minette dyke follows the vein, either
lying within it or along one of the other walls. Where the vein is widest
it consists in general of about 20 per cent vein matter and 80 per cent
rock. Where it is only a few feet wide it may be mainly vein matter.
Pyrite, galena, and sphalerite are present in slight amount. The vein has
been deposited along a shear zone which where widest was penetrated by
vein stringers and where narrowest was usually filled by a single vein.
The relative ages of the dyke and the vein are unknown. Later than both
dyke and vein is parallel shearing intense enough to have locally changed
the argillaceous wall-rock into graphite schist and to have altered the dyke
beyond easy recognition.

Silver Cliff Group (Locality 171)
Reference: Annual Report of the Minister of Mines, British Columbia, 1918.

The Silver Cliff group of four mineral claims is on the east side of
Illiance river and is east of the Silver Star group. The mineral showing
consists of quartz veins and quartz-barite veins in hard breccia. At least
two of the veins are of good size. They contain pyrite, chalcopyrite, and
galena, but sulphide mineralization is very sparse.

Silver Horde Group (Loeality 135)

References: Annual Report of the Minister of Mines, British Columbia, 1916, 1918,
1922, 1924, and 1926.
The Silver Horde group of four mineral claims is on Trout creek
and adjoins and lies north of the Wolf group. It is reached by a trail
branching from the Kitsault trail near Trout creek.