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inclusions of volcanics. All are cut by dykes and small masses

of rhyolite and rhyolite porphyry. It seems probable that the
mountains Tachick (Tackek) and McCrea owe their existence to the
presence of these intrusives and induration caused by them and
that the ores are associated with them or with closely related
intrusives, most probably of Tertiary age.

Mineral deposits have already been found to be
widespread in both the area northeast of Topley and north of
Perow, despite the fact that even in the more rugged parts much
of the area is heavily drift covered. The deposits, like those
of Babine mountains, are small, and occur mainly in innumerable,
small, and irregular fractures and shear zones rather than in
well-developed and continuous breaks, Work on the Richfield,
Gold (Box and Cup), and Golden Eagle groups, however, clearly
demonstrates that there was a sufficient quantity of mineralizing
solution in some localities to form deposits of economic value
providing deposition was concentrated in a few zones. On the
Golden Eagle and Box groups structural conditions favourable for
such concentration do occur. In the main, however, mineralized
parts are too scattered and too irregular to be of any economic
value. The best deposits, so far as rock conditions are concerned,
are probably those situated in straight, vertical, well-developed
fracture or. shear zones. Continuity of a zone on the surface
cannot be considered as a criterion that corresponding depth may
be expected, in fact, in view of experience here and elsewhere,
it is not reasonable to expect much vertical depth for an
individual deposit even though deposits have been found over
vertical ranges of from 600 feet below the surface (3,550 feet)
on the Richfield property to 4,800 foet on McCrea mountain, and

4,500 feet on Tachick mountain,