Porphyry copper prospect in Alaska, United States

Names and other identifiers

Alternate names Unnamed (on San Juan Bautista Island)
Tract name Southeast Alaska Tertiary (003pCu5005)
Site status prospect

Geographic location

Country United States
State or province Alaska
Geographic location -133.29892, 55.40979
Geologic map unit -133.29892, 55.40979
Nearby data

Geologic information

Deposit type Porphyry copper
Age determination method Geologic inference
Age range Cretaceous (Inferred from age of granitic host rock.)
Age reference geologic inference
Minerals chalcopyrite, pyrite, pyrrhotite, sphalerite
Tectonic setting continental margin
Stratigraphic age Cretaceous

Commodity and development information

Development status Prospect
Major commodities Cu, Mo(?)
Minor commodities Ag, Au, Zn
Gold-Moly ratio -9999

Reference information

Comments Associated with a small Cretaceous-age granitic pluton that intrudes Devonian-age graywacke, mudstone, and siltstone of the Port Refugio Formation. Silicification and argillization of granitic rock. Drilled in the early 1970s.
Study area name United States
References U.S. Geological Survey (2014a)
Site reference U.S. Geological Survey National Mineral Resource Assessment Team (2002)