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Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3399
Tract name Western Alaska Range (003pCu5004)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -154.47, 60.38
Geologic map unit -154.47, 60.38
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 56.2Ma
Age determination method K-Ar
Age range 62.7–56.2 Ma (Inferred from age of associated rocks.)
Age reference Eakins and others (1978)
Minerals argentiferous tetrahedrite (?), chalcopyrite, galena, molybdenite, pyrite, pyrrhotite
Tectonic setting continental margin
Stratigraphic age Paleocene

Commodity and development information

Development status Prospect
Major commodities Cu, Pb
Minor commodities Ag, Mo, Sb, Zn
Gold-Moly ratio -9999

Reference information

Comments Iron-staining, silicification, and propylization of dacite. Up to 470 g/t Ag, 3000 ppm Cu, 1500 ppm Pb, and 3600 ppm Zn. No reserves.
Study area name United States
References U.S. Geological Survey (2014a); Nelson and others (1985); Eakins and others (1978)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)