22

About 300 feet below the tunnel the vein passes from the granodiorite
into the surrounding sediments. The vein continues strong and exhibits
characteristics similar to those on the granitic side of the contact.

Analysis of Sample of Arsenical Ore, from the New Hazelton Gold and Cobalt Co., Ltd., New
Hazelton, B.C

Silica and insoluble silicates................0.. cc cece cc tcsseeeeess 13-70 per cent
ETON ich. Shak Pa ae SE OEE ee OUR PR ne ced Aen ‘7 O8iae ass
Arsenic. . 55-53 ‘
Cobalt... 4-40
Sulphur.... pr a 4-00 :
Lime...... f 3 ZVWE
Magnesia 0-90

im _ 98-58

Gold, 4:36 ounces a ton = $87.20
Silver, 3-60 ounces a ton = 2.77
Specific gravity, 5-66

Paragenesis of Ores. The ore from the main vein on the Hazelton
View property is mined for its molybdenum and gold values. It contains,
besides these metals, a large amount of arsenic, iron, and cobalt, and some
silver, which are combined in a group of minerals whose association is most
unusual if not quite unique.

The gangue in which these minerals are found is similar to that of the
Rocher De Boule veins, since it consists chiefly of hornblende with a small
amount of quartz. Feldspar is also found in the vein, but it is thought
to be supplied by the crushed wall rock.

The metallic minerals present, named in the order of their abundance,
are: arsenopyrite, safflorite, léllingite, molybdenite, native gold, a little
chalcopyrite, and probably some electrum or telluride carrying silver.

The arsenopyrite is usually coarsely crystalline and is replaced by
safforite, léllingite, molybdenite, and the gold and silver minerals with a
little chalcopyrite. It is later than the hornblende and is often seen in veins
cutting through the latter.

The safflorite is found chiefly in the arsenopyrite which it replaces,
but a considerable amount also occurs as irregularly shaped grains in the
hornblende. It differs from the arsenopyrite in having a slightly whiter
colour, a smoother surface in the polished section, and a lower relief due
to its slightly less hardness, also by its apparent inability to develop crystal
faces against the gangue which it replaces. This last habit is in marked
contrast with the arsenopyrite which invariably develops sharp, brilliant,
crystal faces against the hornblende. The safflorite was determined in
the polished sections chiefly by its behaviour on treatment with ferric
chloride. This reagent etched it very slowly, developing a pronounced
cleavage in one direction. This single, strong cleavage served to distin-
guish it from smaltite which is isometric, the safflorite being orthorhombic.

Léllingite is fairly plentiful and is closely associated with the arseno-
pyrite, though their relative ages were not determined. It is very similar
to the arsenopyrite, but is distinguished by its comparative indifference
toward nitric acid.

The molybdenite is fairly plentiful and much of the material mined
forms good molybdenum ore. ree

The molybdenite is seldom found in the arsenopyrite, but is freely
disseminated in the hornblende as small flakes and crystals. Its relation
to the arsenopyrite seems to indicate that it is later in order of deposition.

The gold occurs as small grains scattered through the arsenopyrite and
safflorite, and, excepting a very small amount which was seen in the quartz,

~~ 1Analysis by James G. Powell, Provincial Assayer.

sparta