a

55

600 feet east of the adit, a small stream follows along the course of the

zone for 500 feet. Only the foot-wall side on the south side of the stream

is visible. In the few places exposed, the typical vein gangue of quartz,
- hornblende, and actinolite, mineralized with chalcopyrite and magnetite,

was seen. A grab sample taken about 1,000 feet east of the No. 5 adit, or

190 feet west of the Delta inclined tramway at elevation 5,150 feet,

assayed: gold, 0-005 ounce a ton; silver, 0:11 ounce a ton; copper, 0:77
| per cent.

Great Ohio Group (32)

References: Ann. Repts., Minister of Mines, B.C.: 1911, p. 80; 1912, p. 114; 1913,
p. 107; 1914, p. 188; 1915, p. 77; 1916, p. 118. Geol. Surv., Canada, Mem. 110,
p. 18.

This group, staked by Sargent and Munroe in 1910, consists of seven
claims, the Pilot, Great Ohio, Scotch Hill, Henrietta, Maple Leaf, Kitse-
guecla, and Princess. The property is near the head of Juniper Creek on
| the south side of the valley opposite the Rocher Déboulé mine. The camp,
| at elevation 3,950 feet, is 94 miles by road northeast from Skeena Crossing.
The claims were prospected between 1913 and 1916 by Messrs. Jennings
and Trimble, who drove a long adit.

The property is astride the west contact of the granodiorite stock

that forms the core of Rocher Déboulé Mountain. In the granodiorite,
near its contact with sandstones and argillaceous sediments, a strong shear
zone has been followed up the precipitous mountain slope for about 800 feet.
| There are several small open-cuts on it and narrow quartz lenses are
| exposed that carry small amounts of chalcopyrite, pyrite, galena, and
| sphalerite.
An adit, at elevation 4,500 feet, explores two subsidiary shear zones
in the granodiorite, in addition to the one mentioned. One of these is
followed for 355 feet from the portal on an average bearing of north 50
degrees east, and from the end of the drift a crosscut runs 190 feet south-
east to the second shear zone and an additional 70 feet southeast to the
main shear zone. The second shear zone is drifted along for 128 feet, and
the main shear zone for 400 feet to the northeast. In each drift the sheared
zone strikes north 50 to 55 degrees east and dips from 65 to 70 degrees
northwest.

The most westerly shear zone, the one followed for 355 feet, ranges
from 1 to 4 feet in width. There is much gouge and rust along the middle
of the zone, but no vein quartz or concentration of sulphides were seen.
An 18-inch hornblende lamprophyre dyke follows along the zone and has
been sheared and brecciated where it crosses from the foot-wall to the
hanging-wall side of the fissure.

The second shear, as seen in the 128-foot drift, ranges from 8 inches in
width at the crosscut to 2 inches in width at the face of the drift. It consists
of sheared granodiorite replaced by variable amounts of vein quartz, horn-
blende, and chalcopyrite. A 5-inch channel sample taken across a typical
part of the vein 60 feet from the crosscut assayed: gold, 0-005 ounce a
ton; copper, 0-62 per cent.

The main shear zone in the 400-foot drift has an average width of
20 inches. It consists chiefly of sheared and brecciated granodiorite with

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