Unnamed Occurrence (ARDF - ID057; southwest of VABM Caribou), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence consists of iron-oxide-stained quartz veinlets in sandstone and in quartz-healed sandstone breccia of the Upper Cretaceous, Kuskokwim Group, that is cut by a granite-porphyry dike (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). Sulfides are present but were not identified. The size and orientation of the mineralized zone is uncertain. Grab samples contained up to 1,200 parts per billion (ppb) silver, 200 ppb gold, 290 parts per million (ppm) antimony, 130 ppm arsenic, and 50 ppm niobium (McGimsey and others, 1988).
Workings: Surface samples were collected by the U.S. Geological Survey in 1986 (McGimsey and others, 1988).
Age: Unknown; the granite-porphyry dike at the occurrence has been dated at 52.8 Ma (Miller and Bundtzen, 1994).
Commodities (Major) - Ag, Au, Sb; (Minor) - As, Nb
Development Status: None
Deposit Model: Sn-polymetallic deposit or Polymetallic vein (Cox and Singer, 1986; model 20b o
1 entry 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.