Unnamed Occurrence (ARDF - ID070; north side of Camelback Mountain), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is a zone of iron-stained shale in the hornfels aureole of the 73.2 Ma, Camelback Mountain intrusion (Bundtzen and others, 1988; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The mineralized shale is about 15 meter thick as inferred from rubble crop. One grab sample contained 5,100 parts per billion (ppb) mercury and 100 ppb silver (Bundtzen, Laird, and Lockwood, 1988).
Workings: Surface samples were collected by the Alaska Division of Geological and Geophysical Surveys in 1983 (Bundtzen, Laird, and Lockwood, 1988).
Age: Undated; probably related to the nearby Camelback Mountain intrusion that is 73.2 Ma (Bundtzen, Laird, and Lockwood, 1988).
Alteration: Iron oxidation.
Commodities (Major) - Hg; (Minor) - Ag
Development Status: None
1 entry 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.