Unnamed Occurrence (ARDF - ID174; upper Little Eldorado Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence consists of an iron stained, sericitized zone in a granite porphyry plug which intrudes sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The altered zone is of uncertain size and orientation. One sample of mineralization contained 50 parts per billion (ppb) gold and 1,300 ppb mercury (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: Sericitic alteration of granite porphyry; iron oxide staining.
Commodities (Major) - Au; (Minor) - Hg
Development Status: None
2 entries listed.
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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.