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Porphyry copper prospect in Alaska, United States

Names and other identifiers

GMRAP ID 3425
Alternate names Kawisgag
Tract name Alaska Peninsula and Aleutian Islands (003pCu5006)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -159.4223, 55.8876
Geologic map unit -159.4223, 55.8876
Nearby data
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Geologic information

Deposit type Porphyry copper
Age (Ma) 7.15Ma
Age determination method K-Ar biotite
Age range 7.15 ±0.14 Ma (Inferred from age of quartz diorite pluton.)
Age reference Wilson and others (1994)
Minerals arsenopyrite, bornite, chalcopyrite, covellite, gold, molybdenite, pyrite, pyrrhotite
Tectonic setting mixed
Stratigraphic age Miocene

Commodity and development information

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

Reference information

Comments Located in sandstone, grits, and conglomerates of the Eocene- to Paleocene-age Tolstoi Formation which is cut by an intrusive complex. Alteration exhibits a zonal pattern with a central potassic core surrounded by a phyllic zone and an outer propylitic zone. Mapped and sampled in the 1970s and in the mid-1980s; ran approximately 9 line miles of VLF-EM and magnetic surveys. Mapped and sampled in 1990, and again in 2005 and 2006.
Study area name United States
References U.S. Geological Survey (2014a); Fields (1977)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)