Unnamed Prospect (ARDF - ID062; north of upper South Fork; Otter Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This prospect is in an area of pronounced gossan development associated with silica-carbonate-altered mafic dikes that cut sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Several prospect pits explored three pods of iron oxide gossan. The total length of gossan is about 160 feet. Grab samples of gossan contain up to 340 parts per billion (ppb) mercury, 60 parts per million (ppm) arsenic, 100 ppm copper, and a trace of silver (McGimsey and others, 1988).
Workings: Surface samples were collected by the Alaska Division of Geological and Geophysical Surveys and the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Alteration: Silica-carbonate alteration of mafic dikes.
Commodities (Major) - Cu; (Minor) - As, Hg
Development Status: None
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.