83

Coronado groups. Mining machinery and a 50-ton capacity Faust water
concentrating mill were purchased, and some of this equipment was hauled
to the property. Fred Griffin carried out shallow surface operations during
1938 and 1939 and shipped selected silver-lead ore in both years.

There are two parallel zones on the property, 950 feet apart, that
strike north 45 degrees east and dip from 75 to 85 degrees southeast.
The zones are in rhyolite and andesite flows and andesitic flow breccias.
The zones are fault or sheared zones, along which the wall-rock is bleached
and silicified. Galena, sphalerite, tetrahedrite, and arsenopyrite, with a
little chalcopyrite, occur as fissure fillings replacing the altered rock.
A little quartz gangue accompanies the sulphides. Arsenopyrite is the
dominant sulphide in the wall-rock, and assays show that it is accompanied
by some gold.

The more westerly zone is prospected for 600 feet along its strike
by three adits and several open-cuts. The No. 1 or lower adit, at elevation
3,430 feet, follows the zone for 260 feet. From the portal a single fissure,
sparsely mineralized, is followed for 20 feet to where it splits. The two
branches lie 2 to 3 feet apart and continue along the walls of the adit.
Between the two fissures, altered silicified rhyolite is cross fractured and
traversed by small stringers of sulphides. A lens 8 inches wide, containing
over 60 per cent sulphides, occupies the west branch between 20 and 30
feet from the portal. Another sulphide lens, 12 inches wide, 110 feet
from the portal carries about 50 per cent sulphides. From there to the
face of the adit, the two fissures lie from 3 to 6 feet apart and carry
sulphide lenses up to 6 inches in width. At the face, 36 inches of sheared,
silicified rock is replaced by about 3 per cent of arsenopyrite. A 36-inch
channel sample taken across the face assayed: gold, 0-035 ounce a ton;
silver, 0-63 ounce a ton.

No. 2 adit, 90 feet in length, is 250 feet farther up the hill and 75 feet
vertically above the lower. For 20 feet northeast from the portal ore has
been stoped from the back of the drift. Between 20 and 40 feet from the
portal the zone is 12 inches wide, and beyond this gradually narrows until
it pinches out entirely at the face of the drift. The better parts of the
zone are solid sulphides, consisting of about equal amounts of argentiferous
galena, arsenopyrite, and sphalerite, with a little tetrahedrite and
chalcopyrite. Several tons of ore is piled in a dilapidated cabin near the
portal. A representative sample of this ore assayed: gold, 0-36 ounce
a ton; silver, 20-66 ounces a ton; lead, 16-96 per cent; zinc, 12-06 per cent.

No. 3 adit is 80 feet farther up the slope and 30 feet above No. 2 adit.
Tt follows two parallel zones 3 to 4 feet apart. Both sheared zones are
under 3 inches in width and are very sparsely mineralized.

In an open-cut 150 feet farther up the hill, at an elevation of 3,610
feet, the zone ranges from 12 to 30 inches in width and carries about —
30 per cent of sphalerite, arsenopyrite, and galena. In a second cut,
60 feet farther along, the zone has a maximum width of 2 feet and consists
of three parts: a vertical, sheared zone 6 inches wide, carrying 5 per cent
of arsenopyrite; a 4-inch fissure zone containing 50 per cent arsenopyrite;
and 2 feet of intervening, altered breccia, cross fractured, silicified, and
mineralized with about 2 per cent of arsenopyrite.