Unnamed (head of Upper Carmen River)

Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals arsenopyrite; chalcopyrite; gold; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-5
Latitude 60.8507
Longitude -148.6376
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,000 feet at the head of Upper Carmen River. It is in the SW1/4 section 19, T. 9 N., R 5 E., of the Seward Meridian. This is location S-173 of Jansons and others (1984) and is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The country rock at this occurrence is the highly folded, well-bedded Valdez Group slate and graywacke of Late Cretaceous age (Jansons and others, 1984). The deposit is a 3-foot-wide hematite-stained quartz vein that strikes N10E to N20E and dips vertically. The vein is exposed for about 20 feet and contains arsenopyrite, pyrite, chalcopyrite, and traces of gold and silver. A sample analyzed by the U.S. Bureau of Mines contained 92 ppb of gold and 52 ppb of silver (Hoekzema and Sherman, 1983). The deposit was discovered by the U.S. Bureau of Mines in 1982.
Geologic map unit (-148.639723166729, 60.8501165270883)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration This occurrence was discovered by the U.S. Bureau of Mines in 1982 (Hoekzema and Sherman, 1983). A grab sample analyzed by the U.S. Bureau of Mines contained trace amounts of gold and silver. No other workings or assay results are reported.
Indication of production None

References

References

Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
Reporters Jeff A. Huber (Anchorage)
Last report date 11/17/1999