Unnamed (lower part of south fork of Gravina River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities W
Ore minerals chalcopyrite; pyrite; scheelite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CV
Quadrangle map, 1:63,360-scale D-6
Latitude 60.82
Longitude -145.89
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at about 200 ft. elevation on the lower part of the south fork of the Gravina River. It is in the NW1/4 sec. 23, T. 12 S., R. 4 W., of the Copper River Meridian. Accuracy of the location is within 2000 ft. Location corresponds to site C-55 in Jansons and others (1984).

Geologic setting

Geologic description

This site is on a gravel bar in the Gravina River. Float samples from the area include altered and silicified felsic intrusive rocks containing chalcopyrite, pyrite, and scheelite. Analysis of one sample yielded 245 ppm W (Jansons and others, 1984).
Geologic map unit (-145.891985293092, 60.8194648519435)
Alteration of deposit Silicification.

Production and reserves

Workings or exploration Area examined by the U.S. Bureau of Mines as part of a mineral evaluation of the Chugach National Forest. Analysis of one sample yielded 245 ppm W (Jansons and others, 1984).
Indication of production None

Additional comments

Occurrence is on Chugach National Forest land.

References