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as a rule dacitic tuffs and in pisos show large grains of quartz.
They are extensively altered to light grey material that looks
like rhyolite and locally, mainly where sheared or bedded or
along fractures’, they are entirely changed to a chalky white
material. Gold where present generally occurs with tetradymite,

but tetradymite appears to be more widespread and scattered.

Glacier Gulch. Silver-gold-lead-zine, south side. This deposit
is a new discovery made in 1934, A number of cuts expose what
appears to be a single fracture that runs almost straight up the
cliff from its base at an elevation of 2,620 feet to 3,350 feet,
strikes 20 to 40 degress east of north, and dips 30 to 60 degrees
west. In the fracture there is in most places a vein up to 12
inches and possibly more in width which is bordered by heavily
mineralized wall-rock. At the bottom of the cliff the vein is
about 3 inches or less; it is mostly 8 to 12 inches at the main
adit at 2,900 feet, and is generally 8 to 10 inches above this.
Thus it appears to pinch toward its lower end where it is also
the most poorly mineralized. In one adit at 5,050 feet it
pinched to 1 inch from 9 inches in 20 feet. At the upper end
the vein is split and appears to have entered more shattered
ground.

The vein is in massive, green and grey volcanics and
carrics much galena and sphalerite with some pyrite in a quartz
and carbonate gangue. In places, notably in the main adit, it
carries an abundance of needle-shaped crystals of arsenopyrite.
This mineral also occurs in a e-aien band along the upper side
of the vein. Elsewhere the wall-rock is also intensely altered
and heavily impregnated with pyrite and arsenopyrite and probably
carries some precious metal. At the base of the hill much pyrite
and some pyrrhotite were noted with sphalerite, carbonate, and

galena. Assay results obtained in the vein or in the wall-rock

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