White Socks

Occurrence, Active

Commodities and mineralogy

Main commodities Cu; Ni
Other commodities Pd; Pt
Ore minerals chalcopyrite; magnetite; pentlandite; pyrrhotite
Gangue minerals serpentine

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-5
Latitude 63.0885
Longitude -146.1031
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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.

Geologic setting

Geologic description

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much as 0.13 percent nickel, 0.08 percent copper, 8 parts per billion (ppb) palladium, and 30 ppb platinum (W.T. Ellis, unpublished data, 1996).
Geologic map unit (-146.105343081141, 63.0880721577755)
Mineral deposit model Ni-Cu-PGE in differentiated mafic-ultramafic sill.
Age of mineralization 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 of deposit Serpentinization of the ultramafic host rocks along with local iron staining.

Production and reserves

Workings or exploration The prospect was sampled by American Copper and Nickel Company in 1996. It is on active MAN Resources claims.
Indication of production None

Additional comments

American Copper and Nickel Company samples contained as much as 0.13 percent nickel and 30 parts per billion platinum.