Unnamed Occurrence (ARDF - ID136; southest of upper Granite Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is a discontinuous gossan of iron oxides in an aureole of hornfelsed sandstone of the Upper Cretaceous, Kuskokwim Group (Bundtzen, Miller, and Laird, 1986; Miller and Bundtzen, 1994). Disseminated pyrite was noted. Small bodies of quartz monzonite cut the hornfels near the mineralized zone. No size or structural information is available. One grab sample contained 460 parts per million (ppm) arsenic, 500 ppm copper, 10.0 ppm bismuth, and 1,000 parts per billion silver (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1984 (McGimsey and others, 1988).
Commodities (Major) - Bi, Cu; (Minor) - Ag, As
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
2 entries listed. 1 valid mineral.
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Bundtzen, T.K., Miller, M.L., and Laird, G.M., 1986, Prospect examination of the Wyrick placer/lode system, Granite Creek, Iditarod-George mining district, Iditarod B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 86-29, 10 p., 1 sheet, scale 1:200. 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. Szumigala, D.J., 1993, Gold mineralization related to Cretaceous-Tertiary magmatism in the Kuskokwim Mountains of west-central and southwestern Alaska: Los Angeles, University of California Ph.D. dissertation, 300 p.