96

to 1924 the ore was smelted direct, but commencing in that year the ore
was concentrated and the concentrates sintered prior to smelting. The
company develops hydroelectric power for its needs on Falls creek, which
enters Granby bay at Anyox. At the present time the company produces
blister copper containing much gold and silver and blister copper with very
little gold and silver. Production has been at the rate of about 30,000,000
pounds of copper a year. The total production to the end of 1932 has
been 19,400,000 tons of ore yielding 560,600,000 pounds of copper, 98,800
ounces of gold, and 5,913,000 ounces of silver.

The Hidden Creek ore-bodies are at or near the contact between
a body of amphibolite on the west and argillites on the east. In the
vicinity of the mine the contact curves in the form of the letter S. North
and south of the curve the contact strikes north. The distance between
the two ends of the curving part is more than 1 mile and the ore-bodies
are situated on the eastern part of the southern half of the S-like curve.
Underground work has shown that in the northern part of the mineralized
area the argillite-amphibolite contact from the surface to a depth of, in
places, 500 feet dips east at a moderate angle, but below swings to a steep
westerly dip which holds to a depth of at least 2,500 feet. In the southern
part of the mineralized area the contact dips steeply west except in some
places where, at the surface, the dip is at a high angle eastward but
changes below ground to a steep westward dip.

The sediments strike parallel to the contact and in the mine they in
general also dip parallel to the contact. In the vicinity of the mine the
argillites are closely folded, locally overturned, and locally severely sheared.
At many places they have been transformed into knotted schists and near
the ore-bodies they have been extensively silicified, as near No. 1 ore-body
where for a distance of 100 feet outward from the contact they have been
altered to a light-coloured quartzose rock and silicification is fairly strong
for a further distance of several hundred feet. Silicification is also notable
at other places along the contact and in argillite bodies lying within the
amphibolite.

The amphibolite consists mainly of actinolite, but contains also
chlorite, epidote, basic plagioclase feldspar, biotite, and magnetite. Locally
it exhibits pillow-like structures and in places it has the appearance of a
fragmental breccia. In the main, however, the body appears to be intrusive.
A few miles south of the mine the amphibolite truncates the sediments both
across the strike and the dip. In many places it holds inclusions of sedi-
mentary rock and appears as if the body is at least mainly an intrusive.
Some geologists and engineers who have studied the property are, however,
of the opinion that the amphibolite is of extrusive origin.

The amphibolite is in general less sheared than the sediments. It is
silicified at only a few places, as for example near some of the ore-bodies.
J. A. Bancroft in a report made to the Granby Consolidated Mining,
Smelting, and Power Company stated he was of the opinion that some de-
formation of the rocks occurred at the time of intrusion of the amphibolite,
but that the main part of the deformation was associated with the intrusion
of the Coast Range batholith and that it was during the later period of
deformation that the basic intrusive was altered to amphibolite or green-