Unnamed Occurrence (ARDF - ID088; head of Moose Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is in an extensive zone of strong silicification and red, iron-oxide gossan in altered tuff near the base of the Beaver Mountains volcanic field which is part of the the Iditarod Volcanics (Bundtzen, Laird, and Lockwood, 1988; Miller and Bundtzen, 1988). The silica alteration is notable for its light blue chalcedony. The strong red gossan probably developed by oxidation of unknown sulfide minerals. Samples from the altered tuff contained up to 5.1 parts per million (ppm) silver, 76 ppm lead, and 5,000 parts per billion (ppb) mercury (Bundtzen, Laird, and Lockwood, 1988). Similar mineralization can be found over an area about 2 miles by 2 miles in size at the head of Moose Creek.
Workings: The area was sampled by the Alaska Division of Geological and Geophysical Surveys in 1982. (Bundtzen, Laird, and Lockwood, 1988).
Alteration: Silicification with development of much chalcedony.
Commodities (Major) - Ag; (Minor) - Hg, Pb
Development Status: None
Deposit Model: Polymetallic vein? (Cox and Singer, 1986; model 22c).
2 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. 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.