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A molybdenite deposit on Thornhill mountain has afforded
some very high-grade specimens. The molybdenite occurs over 4
considerable arca, but the high-grade material is confined to small
pockets. Small quantities of molybdenitc have been noted in other
sections. A tungsten deposit also occurs on Thornhill mountain,
but development work has showm it to be small.

The eastern section of the Coast range has been subjected
to a number of periods of mineralization related to the groups of
intrusives described on a preceding page. That mincral deposits
are associated with the carliest intrusives, the augite diorite,
is perhaps not definitely established, but on the Treadwell property
gold-bearing chalcopyrite, bornite and pyrite with little or no
quartz occurs in a dyke of this rock and may be related to the dyke.
Similar copper-gold deposits occur on the southwest slope of
Kitsalas mountain on the Lucky Luke, and, possibly, the Cordillera
property.

Most of the gold deposits of the area are related to the
albite-rich intrusives that are known to occur throughout the area
south of Lorne and Douglas creek between Kitsumgallum-Lakelse
valley and Skeena and Kleanza valleys. In practically every
locality where these rocks occur there are similar mineral
occurrences with similar relationships. In the main the deposits
are veins that occur at or near the borders of the albite-rich
intrusives. In some localities they do not extend into intrusives,
in others, especially where the contact phases are dark and fine-
grained, they extend for a short distance into the intrusives and
in still other places where small bodies (dykes, stocks, sills,
etc.) occur the deposits may be wholly within thom. The deposits
are mainly quartz veins carrying pyrite, sphalerite, galena, and
chalcopyrite; less commonly they hold free gold, pyrrhotite,

hematite, tetrahedrite, and other minerals. In places they carry

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