| Main commodities | Cu |
|---|---|
| Other commodities | Co |
| Ore minerals | chalcopyrite; pyrite; pyrrhotite |
| Quadrangle map, 1:250,000-scale | MH |
|---|---|
| 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) |
|---|---|
| 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). |
|---|---|
| Indication of production | None |
| Reporters | W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS) |
|---|---|
| Last report date | 8/14/2002 |