63

dips 65 degrees southeast. It maintains an average width of 18 inches.
The altered dyke rock contains finely disseminated pyrite. A selected
sample of the altered dyke rock collected from the dump assayed: gold,
a trace; silver, 1-26 ounces a ton. This dyke outcrops for a short distance
on a steep slope about 125 feet vertically above the adit, where it is
prospected by a 10-foot shaft.

Rio Grande Group (43)

References: Ann. Rept., Minister of Mines, B.C., 1934, p. C8. Geol. Surv., Canada,
Paper 36-20, 1986, p. 103.

The Rio Grande group is on the south slope of Mount Evelyn on the
north side of Toboggan Creek, 8 miles in a straight line northwest of
Smithers. The property consists of eight Crown granted claims, the
Rio Grande, Spondulix, Rico Aspen, Little Joe, Iron Dollar, Last Hope,
Jumbo, and Big Hope Fraction. The lower workings are a few hundred
feet from the Toboggan Creek trail.

During 19138, J. Sheedy and J. Fisher, original owners, shipped 2 tons
of ore from the property to Granby smelter, which assayed: gold, $2.50
a ton; silver, 84:5 ounces a ton; copper, 7 per cent. A. C. Gardé secured
an option on the claims in 1933, and the following year Rio Grande
Syndicate was formed to develop the property. A camp was built at
elevation 4,500 feet, a short adit was driven, and a little diamond drilling
was done by Boyle Brothers. The claims now belong to the Fisher estate
and to David Bird.

The claims blanket the south slope of Mount Evelyn from an elevation
of 4,000 feet at Toboggan Creek up to the peak of the mountain at
elevation 6,600 feet. The lower part of the valley is occupied by rusty
weathering shales, sandstones, greywacke, and conglomerate beds with a
few thin seams of coal. At elevation 4,700 feet the sedimentary rocks are
in contact with volcanic rocks that extend up the slope to the peak. At the
contact the sediments strike a little south of east and dip 40 degrees north,
so that they underlie the volcanic rocks. The volcanic rocks are intruded
by two granodiorite stocks. One of these forms the core of the highest
peak of Mount Evelyn and the other extends down the slope for over
1,000 feet from the saddle east of the peak. The latter stock extends
easterly for 1 mile down the east shoulder of the mountain.

At elevation 4,600 feet an adit is driven north in the sedimentary
rocks to their contact with the volcanic rocks and a short drift runs
easterly along the contact. A 38-foot depth of water backed up by a
cave-in at the portal prevented examination of this adit during the 1938
season. On the dump there is a small amount of black shale traversed
by fine pyrite seams. In an open-cut on the contact of the sediments with
andesitic rocks 75 feet above the adit, there is much rusty oxidized rock
impregnated with arsenopyrite and pyrite. Similar mineralization was
noted in other cuts farther east along the contact. The cuts are largely
caved, but mineralization was seen to extend over a width of at least
2 feet.

9429553