3”

The total production of the whole of Portland Canal area up to the
end of 1932 is given below.

Ore Gold ‘Silver Lead Zine Copper
Tons Ozs. Ozs. Ozs. Lbs. Lbs.

22, 145, 700 1,398, 460 44,634,350 5,525,000 1,673,000 577, 944, 900

GENERAL CHARACTER OF THE MINERAL DEPOSITS

Portland Canal area, like other mineralized areas along the east side
of the Coast Range intrusives, has a great variety of mineral deposits, but
the deposits of similar nature occur in groups. The physical features of
the area divide it into separate parts and geologically the area is divisible
into parts conforming somewhat with the topographical divisions.

Alice Arm District

The deposits of Alice Arm district form six groups:
Molybdenite deposits.

Quartz veins containing one or more of the metals silver, lead, and zinc.

Copper-bearing deposits.

Zine blende deposits.

Silver-barite-jasper deposits.

Silver-lead deposits.

It might be assumed that the various types of deposits are the result
of zoning from a single source. But no evidence could be found of any
change or gradation from one type to another nor does there appear to
be any uniform change from high to low temperature varieties in any one
locality as would be expected if the deposits came from a single source.
Instead, types appear to be quite distinct from one another as if each
such type came from a separate source.

MOLYBDENITE DEPOSITS

Two molybdenite deposits occur in the southwestern part of the dis-
trict. Both are closely associated in place with small bodies of granite
regarded as being part of the Coast Range intrusives. On the property
developed by Tidewater Molybdenum Mines, Limited, the molybdenite
occurs in pegmatitic quartz -veins that appear to be offshoots from a
small stock of granite. The granite locally contains patches of dis-
seminated molybdenite. The rocks intruded by the granite and in which
the veins occur are hard, argillaceous quartzites. The second deposit is
not well exposed, but the molybdenite appears to be disseminated through
dykes and a small body of granite intrusive into the sedimentary rocks.

On the property of Tidewater Molybdenum Mines, as well shown on
the surface and in underground workings, the molybdenite occurs in thin,
flaky seams distributed throughout the quartz veins. The veins strike
toward the body of granite mentioned and on reaching the granite cease,