Main commodities | Ag; As; Au; Cu; Pb; Zn |
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Ore minerals | arsenopyrite; chalcopyrite; galena; gold; sphalerite |
Gangue minerals | quartz |
Quadrangle map, 1:250,000-scale | CH |
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Quadrangle map, 1:63,360-scale | C-6 |
Latitude | 67.6576 |
Longitude | -149.5105 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This occurrence is at elevation of about 3,600 feet, about 3.9 miles north-northeast of Wiehl Mountain (peak 5765). It is about 0.2 mile northeast of the center of section 26, T. 33 N., R. 9 W. The location is accurate to within a half mile. |
Geologic descriptionThis occurrence was originally described as galena in Devonian(?) greenstone and greenschist near a contact with Devonian siltstone and grit (Brosgé and Reiser, 1964). Mulligan (1974) and Kurtak and others (2002) found a 3-foot-wide quartz vein exposed for 100 feet along strike. No sulfides were seen in place in the quartz vein but there is abundant quartz float in talus below the vein with 2 to 3 percent disseminated pyrite, arsenopyrite, chalcopyrite, galena, and sphalerite. Three samples averaged 72 parts per billion gold, 2.1 parts per million (ppm) silver, 258 ppm copper, 1,260 ppm lead, 303 ppm zinc, and 3,454 ppm arsenic. | |
Geologic map unit | (-149.513261413478, 67.6571946597778) |
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Mineral deposit model | Polymetallic quartz vein (Cox and Singer, 1986; model 22c). |
Mineral deposit model number | 22c |
Workings or exploration | Only limited sampling by government agencies. |
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Indication of production | None |
Reserve estimates | None. |
Production notes | None. |
Additional commentsMAS No. 0020310132 |
MRDS Number | A012146 |
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ReferencesKurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska, 2 vols.: Bureau of Land Management, Alaska Technical Report 50, 845 p.
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Reporters | J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey) |
Last report date | 4/18/2010 |