Unnamed Occurrence (ARDF - ID091; above head of Moose Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence contains two types of mineralization: 1) an iron-oxide-stained quartz breccia zone in altered tuff of the Beaver Mountains volcanic field; and 2) sheeted quartz veins in beds of altered sandstone in the Beaver Mountains volcanic field (Bundtzen, Laird, and Lockwood, 1988; Miller and Bundtzen, 1988; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The size of the occurrence is unknown. Grab samples contained up to 200 parts per billion (ppb) silver, 7,000 ppb mercury, 110 parts per million (ppm) arsenic, and 32 ppm antimony (Bundtzen, Laird, and Lockwood, 1988; McGimsey and others, 1988).
Workings: Surface sampling was conducted by the Alaska Division of Geological and Geophysical Surveys and the U.S. Geological Survey in the 1980s (Bundtzen, Laird, and Lockwood, 1988; McGimsey and others, 1988).
Alteration: Silicification with introduction of chalcedony and development of iron oxides. alteration.
Commodities (Major) - Ag, Hg; (Minor) - As, Sb
Development Status: None
Deposit Model: Polymetallic vein? (Cox and Singer, 1986; model 22c).
2 entries listed. 1 valid mineral.
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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., 1988, Right lateral offset solution for the Iditarod-Nixon Fork fault, western Alaska: U.S. Geological Survey Circular 1016, p. 99-103. 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.