Dead Creek (prospect)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu; Zn
Other commodities Ag
Ore minerals azurite; chalcopyrite; malachite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CV
Quadrangle map, 1:63,360-scale D-6
Latitude 60.9
Longitude -145.95
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Dead Creek prospect is at an elevation of about 3400 feet above the north forks of Dead Creek. It is in the S1/2 sec. 21, T. 11 S., R. 4 W., of the Copper River Meridian. The site is accurately located to within 2000 ft. This prospect is shown as site C-56 in Jansons and others (1984).

Geologic setting

Geologic description

The Dead Creek prospect is in Upper Cretaceous Valdez Group metasedimentary rocks (Nelson and others, 1985). The deposit consists of a 60-foot-wide shear zone containing a 10-foot-wide gossan that carries sulfide-bearing quartz veinlets (Jansons and others, 1984). Ore minerals include azurite, chalcopyrite, malachite, and sphalerite.
Jansons and others (1984) report a 60-foot-long adit and one open pit. A chip sample contained: 91 ppm Cu, 0.8 ppm Ag, 140 ppm Zn; one grab sample contained: 8.9% Cu, 2.7 oz Ag/ton, and 0.31% Zn.
Geologic map unit (-145.951996009343, 60.8994771980881)
Mineral deposit model Possibly polymetallic veins (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c ?
Alteration of deposit Oxidation of iron and copper minerals.

Production and reserves

Workings or exploration Jansons and others (1984) report a 60-foot-long adit and one open pit. A chip sample contained: 91 ppm Cu, 0.8 ppm Ag, 140 ppm Zn; one grab sample contained: 8.9% Cu, 2.7 oz Ag/ton, and 0.31% Zn.
Indication of production None

Additional comments

Site examined as part of a U.S. Bureau of Mines and U.S.G.S. mineral resource evaluation of the Chugach National Forest (Jansons and others, 1984; Nelson and others, 1984).

References