Unnamed Occurrence (ARDF - ID090; between George River and Moose Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is in a intensely altered zone with secondary biotite in a small hypabyssal intrusion of intermediate composition and with a pilotaxitic texture. The plug intrudes shale and sandstone strata of the Upper Cretaceous, Kuskokwim Group (Bundtzen and others, 1988; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). One sample of altered rock with biotite contained 1,000 parts per billion silver (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey in 1983 (McGimsey and others, 1988).
Alteration: Strong zone of secondary biotite in intrusion.
Commodities (Major) - Ag
Development Status: None
1 entry listed.
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Bundtzen, T.K., Laird, G.M., and Lockwood, M.S., 1988, Geologic map of the Iditarod C-3 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 96, 13 p., 1 sheet, scale 1:63,360. 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.