CORPER SUL) Bie VEINS OF TALKWA DISTRICT. 375

small lenticular cavities and horses of the country rock. Pyrite
in the form of small cubes and pyritohedrons is freely dissem-
inated through the quartz. Associated with the pyrite is an
equal amount of arsenopyrite. Replacing these minerals and
the quartz, is a fairly large amount of chalcopyrite and zinc
blende, which appear to. have been deposited almost simul-
taneously. 7

The ore of the King claim may, for purposes of description,

-be divided into the chalcopyrite-pyrite ore of the east end, bor-

nite-chalcopyrite ore of the central part, magnetite ore of the

MAGNETITE -
CHALCOPYRITE
BOoRNITE -

CHALCOPYRITE
BORNITE

PYRITE -
CHALCOPYRITE

HEMATITE -
CHALCOPYRITE

S00 Feet

Fig. 49. Section parallel to King Vein.

middle south part, and the chalcopyrite-specularite ore of the
western end (see Fig. 49).

The chalcopyrite-pyrite ore is the most plentiful of the four
types, and is distinctly different in appearance and composition.
It has a brassy color and is associated with a large amount of
quartz. The pyrite grains are about one millimeter in diameter,
fairly uniform in size, and rather evenly distributed in the quartz,
but with a slight tendency to form bands. The arsenopyrite, the
only arsenic-bearing mineral, occurs in grains of a similar size
but is not so plentiful. The chalcopyrite is much more plentiful
than the other minerals, forming about 70 per cent. of the sul-
phides present. It replaces the quartz extensively and also forms

partis
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