- Mineral Resources
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- Global assessment of undiscovred copper resources
Porphyry copper prospect in
Alaska, United States
Names and other identifiers
| GMRAP ID |
3420 |
| 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) |
