Unnamed Occurrence (ARDF - ID083; south of the head of Maybe Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence consists of hornfels rubble and float near the contact of monzonite of the Late Cretaceous, Maybe Creek pluton and sandstone of the Upper Cretaceous, Kuskokwim Group (Bundtzen, Laird, and Lockwood, 1988; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). A sample of hornfels contained 850 parts per billion (ppb) silver, 200 parts per million (ppm) lead, 9,500 ppb mercury, and 60 ppm arsenic (McGimsey and others, 1988).
Workings: The area was sampled by the U.S. Geological Survey in the 1980s (McGimsey and others, 1988).
Age: Possibly related to the Late Cretaceous, Maybe Creek pluton which is 68.3 Ma (Bundtzen, Laird, and Lockwood, 1988).
Alteration: Associated with hornfels near monzonite pluton.
Commodities (Major) - Ag, Pb; (Minor) - As, Hg
Development Status: None
Deposit Model: Polymetallic vein? (Cox and Singer, 1986; model 22c).
No entries 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.