Willow Creek Prospect, Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: Alluvial and residual placers on the hillside north of Willow creek are known from an elevation of about 1,200 to 1,500 feet where they were explored in 1958 (Don Harris, oral communication, 1983). No size or grade information is available. The prospect area is underlain by monzonite and the placer is possibly a residual placer over a lode deposit in the monzonite (Miller, Bundtzen, and Gray, 2005). Panned concentrates collected at the site contain gold, chromite, magnetite, and cinnabar (Bundtzen, Cox, and Veach, 1987; Bundtzen, Laird, and Lockwood, 1988).
Workings: Alluvial and residual placers on the hillside north of Willow creek are known from an elevation of about 1,200 to 1,500 feet where they were explored in 1958 (Don Harris, oral communication, 1983). No size or grade information is available. Panned concentrates were collected in the 1980's by the Alaska Division of Geological and Geophysical Surveys and the U.S. Geological Survey (Bundtzen, Cox, and Veach, 1987; Bundtzen, Laird, and Lockwood, 1988; McGimsey and others, 1988).
Age: Probably Quaternary.
Commodities (Major) - Au
Development Status: Undetermined.
Deposit Model: Placer Au deposit (Cox and Singer, 1986; model 39a).
4 entries listed. 4 valid minerals.
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Bundtzen, T.K., Cox, B.C., and Veach, N.C., 1987, Heavy mineral provenance studies in the Iditarod and Innoko districts, western Alaska: Process Mineralogy VII, The Metallurgical Society, p. 221-246. 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., 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.