51

was installed at elevation 5,040 feet to carry the ore across the mountain
from the bunkers to an aerial tramway that took the ore down to the
railway at Tramville.

In 1915, from May 17 to December 12, 17,000 tons of ore was shipped
to Granby smelter at Anyox, averaging 8 per cent copper, $1.65 in gold,
and 50 cents in silver to the ton. In 1916, miming was carried on by the
Rocher Déboulé Mining Company, production being 16,800 tons of ore
shipped containing 1,200 ounces of gold, 16,700 ounces of silver, and
1,619,145 pounds of copper. Smaller ore shipments were made the follow-
ing 2 years, but in October 1918 all mining operations were suspended,
From April 1915 until October 1918, the mine produced 39,833 tons of ore
containing 4,214 ounces of gold, 62,865 ounces of silver, and 5,746,306
pounds of copper.

In 1929, Aurimont Mines, Limited, took an option on the property and
shipped 72 tons of hand-sorted ore, which assayed: gold, 0-14 ounce a ton;
silver, 40 ounces a ton; copper, 4 per cent. A little further work was done
in 1930 by Hazelton Copper Mines, Limited, under W. S. Harris.

The claims are on the west contact of the granodiorite stock that forms
the core of Rocher Déboulé Mountain. The granodiorite is a coarsely crys-
talline, mottled grey rock composed of 10 per cent orthoclase, 60 per cent
andesine, 10 per cent quartz, 10 per cent biotite, and 10 per cent horn-
blende, with a little magnetite. The contact of the intrusive with sand-
stones, argillites, and tuffaceous sediments runs northerly across the west
boundary of the property. The granodiorite is traversed by a number of
strong fissure zones that outcrop on the mountain slope, the lowest being at
an elevation of 4,400 feet and the highest at 5,300 feet. The zones strike
easterly and dip from 35 to 65 degrees north into the mountain. The
lowest vein extends westerly for a short distance from the granodiorite into
the bedded rocks, but the others lie entirely within the granodiorite. They
range from several hundred to several thousand feet in length and from
4 inches to 8 feet in width. They were formed by shearing along fault
lines, and the crushed and brecciated granodiorite along the faults acted
as channels for the rising mineralizing solutions. The deposits are valuable
for their copper content, but economic amounts of gold and silver are also
present. The zones commonly carry only a low grade of milling ore and
in some places are barren. Two of the zones, the lowest and the highest,
were found to carry ore shoots of high-grade copper ore. O’Neill (1919)
states that in the upper part of the highest vein there were four large
bodies of high-grade copper ore of irregular shape at approximately the
same elevation, but separated horizontally by 50 to 200 feet of material
carrying much lower values, and in places no values at all.

The granodiorite is intruded by several kinds of dykes. One is a fine-
grained, grey, quartz diorite dyke 50 feet wide, which strikes a little east
of north through the mine workings and dips 55 degrees northwest. This
dyke was intruded prior to fissuring and is offset where it crosses the zones.
Small porphyritic diorite dykes were intruded subsequent to the fissuring,
but prior to mineralization. Some of these dykes, only a few inches in
width, were seen along minor fissures west of the upper ore bunkers. The
dykes are bordered on both sides by quartz and hornblende vein-gangue.
A 3-foot dyke of porphyritic diorite outcrops on the south side of the upper-