White Socks Occurrence, Delta River District, Valdez-Cordova Borough, Alaska, USA
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Location: This occurrence is located one mile south-southwest of Landmark Gap Lake at an elevation of 3,200 feet and is in the SW1/4SW1/4 section 18, T. 21 S., R. 9 E., Fairbanks Meridian.
Geology: The White Socks prospect is hosted by an Upper Triassic mafic-ultramafic intrusive complex that is comagmatic with the basalt flows of the Nikolai Greenstone (Nokleberg and others, 1991; L.D. Hulbert, oral communication, 2001). This complex may connect at depth with the Fish Lake complex at the base of the Amphitheater syncline (W.T. Ellis, oral communication, 2001). At the prospect, locally iron-stained and gossany float and rubble crop of serpentinized olivine clinopyroxenite and olivine melagabbro contain as much as 5 percent disseminated pyrrhotite and magnetite. Small amounts of chalcopyrite and pentlandite occur in association with the pyrrhotite. Samples collected by American Copper and Nickel Company contained as much as 0.13 percent nickel, 0.08 percent copper, 8 parts per billion (ppb) palladium, and 30 ppb platinum (W.T. Ellis, unpublished data, 1996).
Workings: The prospect was sampled by American Copper and Nickel Company in 1996. It is on active MAN Resources claims.
Age: Late Triassic, the age of the host rock. Phlogopite from Tangle complex ultramafic rocks yielded an age of 323 +/- 2 Ma (L. Hulbert, oral communication, 2001).
Alteration: Serpentinization of the ultramafic host rocks along with local iron staining.
Commodities (Major) - Cu, Ni; (Minor) - Pd, Pt
Development Status: None
Deposit Model: Ni-Cu-PGE in differentiated mafic-ultramafic sill.
5 entries listed. 4 valid minerals.
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Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.