Unnamed Occurrence (ARDF - ID152; head of American Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is a iron oxide gossan formed by the oxidization of undetermined sulfide minerals; the gossan is in hornfels developed in siltstone and siliceous sandstone of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Several pods of iron-oxide-rich gossan were sampled. The samples contained up to 700 parts per billion (ppb) silver, 640 parts per million (ppm) zinc, 500 ppm copper, 110 ppm antimony, 6.0 ppm bismuth, 40 ppm arsenic, and 20.00 percent iron (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1985 (McGimsey and others, 1988).
Alteration: Gossan developed.
Commodities (Major) - Ag, Cu, Zn; (Minor) - As, Bi, Fe, Sb
Development Status: None
2 entries listed. 2 valid minerals.
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Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p. 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.