166

400 feet long, through which the tailings were sluiced, was driven up-
stream from the lower part of Spruce canyon. Two hydraulic elevators
were used and the deep channel was cleaned out for a distance of nearly
600 feet upstream from the head of the canyon. Comparatively little
gold is said to have been recovered for, apparently, nearly all the gold was
concentrated on bedrock because of the open porous character of the

Shafts
J. Snowdon
2.Victoria
3. Vancouver
4. Vulcan
35. Costello
6. Clarke

Frecent alluvium
and callings

True North

S52" Boreho/
Sce/e of feet S SaaS
j = fo} ‘ 7900 A
Contour interval 40 feet

Gedlogical Survey, Canada.

Figure 27. Chisholm creek, Cariboo district.

gravels, and the bedrock had been very thoroughly cleaned in the previous
drifting. A small piece of unworked ground was struck near the upper end
of the Lightning claim, but the rock sides of the channel proved to be
nearly vertical, so that there were no bench deposits of value such as had
been expected. In 1915 three cross-sections of borings (Figures 26 and 27)
were made by the Yukon Gold Company to test the ground below the
canyon for dredging. In all, fifteen borings were made and the average
value for all the holes is said to have been only 7 cents a cubic yard, and the