140

appear to be sharply defined on the sides or ends, but the contacts were
largely obscured by rust. Along the strike between the ore shoots the
shear zone contains rusty, sheared rock and stringers of quartz. This
rusty, sheared rock holds values in silver and lead probably contained in
silver and lead-bearing minerals disseminated through the sheared rock and
the quartz stringers. The vein and ore shoots have the appearance of hay-
ing been formed chiefly by replacement. Ore shoots have probably resulted
from more thorough replacement in local areas.

A peculiarity of the veins at the Porter Idaho and Prosperity is that
they are deeply oxidized. The ore as shipped in the earlier years com-
monly consisted of rusty material containing residual fragments of sulphide
and quartzose matter. The sulphide was chiefly galena. The lowest adit
exposed a vein at a vertical depth of 275 feet below the outcrop of the vein
and 450 down the dip from the outcrop. According to samples from the
vein at this depth the ore was still partly oxidized. Later mining dis-
closed oxidation down to a depth of 450 feet. In view of the deep oxidation
and the presence of native silver at depth it seems very likely that some
secondary enrichment of silver has taken place.

The Porter Idaho Mining Company commenced shipping ore in 1924.
The shipments for three years totalled 498 tons and averaged 0-08 ounce
of gold, 250 ounces of silver, and 350 pounds of lead a ton. In 1927, 125
tons of ore from a different vein averaged 0-1 ounce of gold, 519 ounces
of silver, and 845 pounds of lead a ton. In 1926, 29 tons of ore were shipped
from the Prosperity workings and averaged 0:07 ounce gold and 416 ounces
silver a ton, and 26 per cent lead. During the years 1928 to 1930, inclusive,
a total of 23,300 tons of ore were shipped and yielded 480 ounces of gold,
1,700,000 ounces silver, and 1,150,000 pounds of lead. Shipments ceased in
1930.

Radio Stewart Mines, Limited (Locality 65)

References: Annual Report of the Minister of Mines, British Columbia, 1910, 1925, and
1928; Geol. Surv., Canada, Memoir 32.

Radio Stewart Mines, Limited, holds a group of claims north of Bitter
creek about 4 miles from Bear river. Three quartz veins in argillite at an
elevation of 1,600 feet are up to 5 feet wide and contain pyrite and chal-
copyrite. Two quartz veins at an elevation of 4,000 feet are mineralized
with pyrite and chalcopyrite, but the upper veins also contain galena,
sphalerite, and tetrahedrite.

Red Cliff Extension Mining Company, Limited (Locality 34)

References: Annual Report of the Minister of Mines, British Columbia, 1910; Geol.

Surv., Canada, Memoir 32.

The Red Cliff Extension Mining Company, Limited, holdings are west
of American creek near its mouth and north of the Red Cliff group. An
easterly striking zone of fissuring in volcanic rocks is mineralized for a
width of 12 feet with quartz, Jasper, calcite, pyrite, chalcopyrite, and galena.