GMRAP ID | 21 |
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Alternate names | Three Brothers, Clipper, Condor, Hemlock/Porter |
Tract name | Cascade Arc (003pCu9014) |
Site status | deposit |
Country | United States |
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State or province | Washington |
Geographic location | -121.366666667, 47.5 |
Geologic map unit | -121.366666667, 47.5 |
Nearby data |
Deposit type | Porphyry copper |
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Age (Ma) | 25Ma |
Age determination method | unknown |
Age range | 25 Ma |
Age reference | Singer and others (2008) |
Minerals | ankerite, arsenopyrite, azurite/malachite, barite, biotite, carbonate, chalcocite, chalcopyrite, chlorite, cosalite, covellite, epidote, galena, gold, molybdenite, prehnite, pyrite, pyrrhotite, sericite, siderite, sphalerite |
Associated rocks | breccia, quartz diorite porphyry, granodiorite, quartz diorite, quartz monzonite, tonalite |
Tectonic setting | continental margin |
Stratigraphic age | Oligocene |
Development status | Occurrence |
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Major commodities | Cu |
Tonnage (Mt) | 93Mt |
Cu grade (%) | 0.41% |
Mo grade (%) | 0.02% |
Contained copper | 380,000t |
Gold-Moly ratio | -9999 |
Study area name | United States |
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References | Lasmanis (1995); Patton and others (1973); Singer and others (2008) |
Site reference | U.S. Geological Survey National Mineral Resource Assessment Team (2002) |