Unnamed Occurrence (ARDF - ID142; southwest flank of Granite Mountain), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is heavily iron-oxide-stained sandstone with semi-massive pyrrhotite lenses an inch or so thick. The sandstone is part of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). One grab sample contained 390 parts per million (ppm) antimony, 850 ppm arsenic, 900 parts per billion mercury, and more than 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 1986 (McGimsey and others, 1988).
Alteration: Iron oxide alteration.
Commodities (Major) - As, Sb; (Minor) - Fe, Hg
Development Status: None
Deposit Model: Polymetallic veins? (Cox and Singer, 1986; model 22c).
2 entries listed. 1 valid mineral.
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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.