Unnamed Occurrence (ARDF - ID151; near hill 1265), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is a zone of thin quartz veinlets with small tourmaline grains in a distinctively reddish colored, hematite-bearing sandstone of the Upper Cretaceous, Kuskokwim Group (Miller and Bundtzen, 1994). The sandstone strikes N42W and dips 50SW. The individual quartz veinlets are about one-eighth of an inch thick but there is no information on the overall size of the zone of quartz veinlets. A grab sample contained 150 parts per million (ppm) tin, 500 parts per billion (ppb) silver, 900 ppm zinc, 20 ppm arsenic, 960 ppb mercury, 1.9 ppm cadmium, and 2,000 ppm boron (McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Alteration: Development of hematite and tourmaline.
Commodities (Major) - Ag, Sn; (Minor) - As, Cd, Hg, Zn
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).
3 entries listed. 2 valid minerals.
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Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286. 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.