46

is augite porphyrite. The contact of the augite porphyrite with the Bitter
Creek formation is on the opposite side of the glacier and appears to dip
gently northward. Development on the L and L has been concentrated
on a northwesterly striking vein which dips 70 degrees southwestward.
The vein is 3 feet wide and consists of quartz with pyrite, chalcopyrite,
arsenopyrite, pyrrhotite, sphalerite, galena, tetrahedrite, and an unidenti-
fied lead sulphantimonide. The most plentiful sulphides are pyrite, galena,
sphalerite, and tetrahedrite. One shoot of ore has been discovered in the
vein. It is 1 to 2 feet wide, 120 feet long, and extends from the surface
to a depth of 120 feet at least.

The development on the property consists essentially of three drift
adits (See Figure 10). The uppermost or No. 2 adit follows the ore-shoot
for 120 feet where, although the vein continued, the ore-shoot ended. Be-
lieving that the ore deposit had been offset by a fault at this point those
responsible for the development drove crosscuts to both sides in search
of the faulted part. Eventually the drift was continued and some ore,
which may be the northern end of a second ore-shoot, was found at the
face of the drift. The middle or No. 1 adit is 100 feet northwest and 60
feet below the upper adit. This adit follows the vein for most of its length,
but the ore-shoot is only 60 feet long on this level. Stopes exist between
No. 1 adit and the surface. The lowest or No. 3 adit is 320 feet northwest
and 160 feet below the upper adit. This adit follows the vein for most
of its length, but the ore-shoot is not present.

Evidence furnished by polished specimens of the ore suggest two
periods of mineralization. The first resulted in a vein of quartz with
pyrite, chalcopyrite, and arsenopyrite, and some galena and sphalerite.

The minerals of the second period of mineralization are chiefly galena
and tetrahedrite, which were deposited in fractures in the earlier, lean,
vein matter. The ore-shoot consists chiefly of minerals formed during
the second period of mineralization. Specimens of vein matter from the
lowest adit show narrow stringers of galena and tetrahedrite traversing
the earlier vein matter, and suggest that commercial ore extends down-
ward nearly to this adit. Ore specimens from near the surface contain
an unidentified lead sulphantimonide. The mineral occurs alone in narrow
veinlets and is distinctly later than any other mineral in the vein.

Shipments of ore were made from the property in 1924 and 1926. A
total of 59 tons of ore was shipped yielding 0-1 ounce gold, and 160 ounces
silver per ton and 13 per cent lead.

The future importance of the property depends on the finding of
other ore-shoots. Search should be made farther south on the vein on the
surface in the upper adit.

ALBANY MINING COMPANY, LIMITED

The holdings of the Albany Mining Company, Limited, are on the
south fork of Glacier creek. The camp and most of the workings are
about 1,700 feet above sea-level The country rock is argillite near the
contact of a large body of augite porphyrite.

The first development work done on this property consisted of open-
cuts and a short adit on a 2-foot quartz sulphide vein. Local bunches of