Main commodities | Cu |
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Other commodities | Co |
Ore minerals | chalcopyrite; pyrite; pyrrhotite |
Quadrangle map, 1:250,000-scale | MH |
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Quadrangle map, 1:63,360-scale | A-3 |
Latitude | 63.2199 |
Longitude | -145.1148 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This occurrence is at an elevation 5,300 feet approximately 2 miles east of lower Gakona Glacier. It is in the SW1/4SW1/4 section 32, T. 19 S., R. 14 E., Fairbanks Meridian. |
Geologic descriptionThe north-northeast-trending deposit at this site consists of steeply dipping east-west-trending Upper Triassic layered gabbro, peridotite, and pyroxenite (W.T. Ellis, oral communication, 1994). Some of the gabbro and pyroxenite are very coarse grained. A 3-foot-thick iron-stained zone that strikes north and dips 45E is serpentinized and contains disseminated to semimassive segregations of pyrite, pyrrhotite, and chalcopyrite. A grab sample of a sulfide-rich boulder contained 1,056 parts per million (ppm) copper and 102 ppm cobalt. | |
Geologic map unit | (-145.117021782233, 63.2194960241499) |
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Mineral deposit model | Ni-Cu-PGE in differentiated mafic-ultramafic sill. |
Age of mineralization | Late Triassic. |
Alteration of deposit | Conspicuous iron-staining and moderate to strong serpentinization. |
Workings or exploration | The prospect was discovered in 1994 by American Copper and Nickel Company (W.T. Ellis, oral communication, 1994). |
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Indication of production | None |
Reporters | W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS) |
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Last report date | 8/14/2002 |