Unnamed (lower part of south fork of Gravina River)

Occurrence in Alaska, United States with commodity Tungsten

Geologic information

Identification information

Deposit ID 10307373
Record type Site
Current site name Unnamed (lower part of south fork of Gravina River)

Geographic coordinates

Geographic coordinates: -145.89252, 60.8196 (WGS84)
Relative position 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).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Tungsten Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Scheelite Ore
Quartz Gangue

Alteration

  • (Local) Silicification.

Nearby scientific data

(1) -145.89252, 60.8196

Comments on the geologic information

  • 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).

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Copper River

Comments on the workings information

  • Workings / 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).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF CV040

Bibliographic references

  • Deposit

    Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, Southcentral Alaska: U.S. Bureau of Mines Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.

Comments on the references

  • Primary Reference = Jansons and others, 1984

General comments

Subject category Comment text
Deposit Other Comments = Occurrence is on Chugach National Forest land.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-00 S.W. Nelson U.S. Geological Survey