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Unnamed Occurrence (ARDF - ID131; head of Bismarck Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA

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Location: This occurrence is at an elevation of about 2,300 feet, about 0.6 mile east of the Bismarck Creek prospect (ID130). It is about 0.6 mile south-southeast of hill 2475 and near the center of section 23, T. 27 N., R. 42 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a gossan of unknown size and orientation. Any original sulfides have been completely oxidized. The gossan is at the edge of a large area of hornfels derived from the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Bundtzen and Miller, 1997; Miller, Bundtzen, and Gray, 2005). One grab sample of gossan from the occurrence contained 500 parts per million (ppm) copper, 140 ppm antimony, 500 ppb silver, and 20 ppm arsenic (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Alteration: Pervasive oxidation.

Commodities (Major) - Cu; (Minor) - Ag, As, Sb
Development Status: None

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1 entry listed.

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References

Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286. McGimsey, R.G., Miller, M.L., and Arbogast, B.F., 1988, Paper version of analytical results, and sample locality map for rock samples from the Iditarod quadrangle, Alaska: U.S. Geological Survey Open-File Report 88-421-A, 110 p., 1 sheet, scale 1:250,000. Miller, M.L., and Bundtzen, T.K., 1994, Generalized geologic map of the Iditarod quadrangle, Alaska showing potassium-argon, major oxide, trace element, fossil, paleocurrent, and archeological sample localities: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-A, 48 pages; 1 sheet, scale 1:250,000. Miller, M.L., Bundtzen, T.K., and Gray, J.E., 2005, Mineral resource assessment of the Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2219-B, scale 1:250,000, pamphlet.

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