Unnamed Occurrence (ARDF - ID054; near Hickey Creek), Iditarod District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: This occurrence is in serpentinized ultramafic rock of the Jurassic Dishna River ophiolite (Miller, 1990; Miller, Bundtzen, and Gray, 2005). Rubble crop near the base of the hill locally contains disseminated chromite. Grab samples contain up to 30.0 parts per million (ppm) silver, 2,000 ppm nickel, 2,000 ppm chromium, and anomalous arsenic (McGimsey and others, 1988). The chromium and nickel are probably in both spinel (chromite) and in silicate minerals (olivine and pyroxene) of the ultramafic rocks.
Workings: The area was sampled by the U.S. Geological Survey in 1985 (McGimsey and others, 1988).
Age: Probably genetically related to the host rock, the serpentinite of the Jurassic Dishna River ophiolite (Miller, 1990).
Commodities (Major) - Ag, Cr, Ni; (Minor) - As
Development Status: None
Deposit Model: Dunitic Ni-Cu or Podiform Chromite (Cox and Singer, 1986; models 6a and 8b).
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., 1990, Mafic and ultramafic rocks of the Dishna River area, north central Iditarod quadrangle, west-central Alaska: U.S. Geological Survey Bulletin 1946, p. 44-50. 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.