| Quadrangle map, 1:250,000-scale | MH |
|---|---|
| Quadrangle map, 1:63,360-scale | A-4 |
| Latitude | 63.1346 |
| Longitude | -145.9128 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This occurrence is at an elevation of 3,950 feet on the southeast flank of Sugarloaf Mountain. It is at the center of SW1/4 section 31, T. 20 S., R. 10 E., Fairbanks Meridian. It corresponds to locality 4 of Rose (1966 [ADMM GR 19]). |
Geologic descriptionPermian black shale and calcareous black shale at this location contain abundant pyrite, including lenses of almost massive pyrite as much as one-half inch thick (Rose, 1966 [ADMM GR 19]). Analysis of a chip sample showed only 35 parts per million (ppm) copper, 105 ppm zinc, 20 ppm lead, and 9 ppm molybdenum (Rose, 1966 [GR 19]). L.D. Hulbert (oral communication, 2001) suggested that the mineralization could be magmatic, related to the emplacement of high-level metal-depleted gabbroic sills that may be feeders to the Nikolai Greenstone of Late Triassic age. | |
| Geologic map unit | (-145.91504231924, 63.1341772235514) |
|---|---|
| Mineral deposit model | Shale-hosted sulfide. |
| Age of mineralization | Permian or Late Triassic. |
| Workings or exploration |
Lithochemical sampling by MAN Resources indicates extreme metal depletion. The occurrence is on active claims of MAN Resources. |
|---|---|
| Indication of production | None |
References | |
| Reporters | W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS) |
|---|---|
| Last report date | 6/17/2002 |