45:

veins are common in and near the amphibolite, as would be expected since
the amphibolite was capable of causing much silicification of intruded rocks.
The quartz veins in the amphibolite contain copper, thus furnishing
evidence of the close relation existing between quartz and copper and
suggesting that the silicification exhibited at the edges of the copper-bearing
replacement bodies was produced as a result of ore deposition. These
conditions, and the further fact that the Anyox and Maple Bay types of
deposits do not occur elsewhere, but only in and about the amphibolite
area, all suggest that the deposits and the Anyox amphibolite are directly
connected in origin. On the other hand the ore deposits in the Anyox
amphibolite occur in shear zones. The amphibolite was, therefore, subject
to shearing prior to the ore deposition. This is a serious objection to the
idea that the amphibolite was the source of the ore. Furthermore, the
ore deposits appear to be later than the earliest dykes that may be
associated with the Coast Range batholith. However, it might be that
the now exposed part of the body of amphibolite was solid and capable
of being sheared, whereas in a lower part the magma might still be fluid
and a source of ore. The writer is inclined to the view that the source
of the amphibolite was also the source of the ores. The time of ore
deposition may have been as late as the intrusion of the Coast Range
batholith, and indeed the Anyox amphibolite may be an early phase of
the batholith. If the amphibolite is the source of the ore, search for other
similar deposits should be confined to the Anyox amphibolite and the
immediate vicinity of this body.

Northern Part of Portland Canal Area

On Portland canal north of Maple bay and in Marmot, Bear, and Sal-
mon Rivers districts, the mineral deposits can be divided into the following
five groups:

Deposits containing gold, silver, lead, zinc, and copper.

Gold-quartz veins.

Deposits consisting of closely spaced gold-quartz veinlets.

Gold-pyrrhotite deposits.

Copper deposits.

The gold deposits and the mixed sulphide deposits of the first four
groups may grade into one another and appear to be related in origin to the
Coast Range intrusives. The copper deposits on the other hand do not
appear to grade into the other types. They occur in four areas separated
and surrounded by deposits containing gold, silver, lead, and zine.

DEPOSITS CONTAINING GOLD, SILVER, LEAD, ZINC, AND COPPER

The mineral deposits of this group show considerable variation, but
apparently all are members of a continuous series. Gold-silver deposits
by addition of lead, zinc, and copper, and by decrease in gold and silver,
change to silver-lead, silver-lead-zine deposits and types with more complex
mineralization.

Gold-silver deposits are well exemplified by the deposits of the Premier
mine. These are well-defined, vein-like replacements up to 60 feet wide
and as much as 2,000 feet long. The ore-bodies consist in general of pyrite.

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