Quadrangle map, 1:250,000-scale | WI |
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Quadrangle map, 1:63,360-scale | C-2 |
Latitude | 67.558 |
Longitude | -150.8153 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This occurrence is about 2 miles south-southeast of the small lake at the head of Bonanza Creek. It is on the west slope of the ridge between Bonanza and Conglomerate Creeks, about 0.5 mile west-northwest of the center of section 25, T. 32 N., R. 15 W., of the Fairbanks Meridian. The location is accurate. |
Geologic descriptionBrosge and Reiser (1960) originally describe this occurrence as a galena-bearing quartz vein in Middle(?) Devonian slate, phyllite and siltstone. Kurtak and others (2002) describe a 35-foot-wide by 150-foot-long area of rusty-weathering, intensely fractured and dolomitized metamorphic rock that they tentatively interpret as a northwest-trending shear zone. The rock is cut by numerous quartz veinlets containing traces of galena, sphalerite, and possibly ankerite(?). A sample of quartz float with traces of galena and sphalerite contained 3,510 parts per million (ppm) zinc, 3,438 ppm lead, and 3,772 ppm arsenic. | |
Geologic map unit | (-150.818056003141, 67.5575640002647) |
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Mineral deposit model | Quartz vein? with minor galena and sphalerite. |
Age of mineralization | Devonian or younger based on the age of the host rock. |
Alteration of deposit | Rusty weathering, intense fracturing, and dolomitization. |
Workings or exploration | Only surface sampling by the U.S. Geological Survey and the Bureau of Land Management (Brosge and Reiser, 1960; Kurtak and others, 2002). |
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Indication of production | None |
Reserve estimates | None. |
Production notes | None. |
Additional commentsThis occurrence is the Gates of the Arctic National Park. |
MRDS Number | A011953 |
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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: Final Report: U.S. Bureau of Land Management Technical Report 50, v. 1 and 2, 845 p.
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Reporters | J.M. Britton (Anchorage); D.J. Grybeck (Contractor, USGS) |
Last report date | 2/1/2011 |