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Antler Occurrence, Delta River District, Southeast Fairbanks Borough, Alaska, USA

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Location: This occurrence is at an elevation of 3,800 feet on the south flank of peak 3924 about 2.5 miles southeast of Fish Lake. It is in the NW1/4SW1/4 section 6, T. 20 S., R. 10 E., Fairbanks Meridian.
Geology: The Antler occurrence is near the east end of the Fish Lake mafic-ultramafic intrusive complex of Late Triassic age. The occurrence was discovered by American Copper and Nickel Corporation (ACNC) geologists in 1995 and consists of disseminated pyrrhotite and chalcopyrite in wehrlite and in adjacent gabbro dikes that strike N45E and dip 75 SE. ACNC grab samples contain 0.14 percent nickel, 0.17 percent copper, 90 parts per billion (ppb) palladium, and 45 ppb platinum. The Fish Lake complex is a south-dipping layered intrusion of dunite, peridotite, and gabbro that varies from less than 3,000 feet thick to more than 7,000 feet thick and extends for more than 24 miles in length (W.T. Ellis, oral communication, 2001). It may be a lopolithic feeder of the Nikolai basalt flows of the Wrangellia Terrane (W.T. Ellis, oral communication, 2001). The complex intrudes the Tangle Formation of Permian age (Nokleberg and others, 1991). It may connect with the Tangle complex at depth below the Amphitheater synform. Magmatic mineralization is synchronous with emplacement of the Fish Lake complex, which is part of a 120-mile-long belt of mafic-ultramafic and associated rocks in the east-central Alaska Range.
Workings: Exploration on the Fish Lake property has been by American Copper and Nickel Company working with Fort Knox Gold Resources Inc. Exploration through 2001 included rock sampling, hand trenching, airborne and ground geophysical surveys, and completion of eight diamond drill holes (W.T. Ellis, oral communication, 2001). The occurrence is on active claims of Fort Knox Gold Resources.
Age: Late Triassic.
Alteration: The peridotite is moderately serpentinized.

Commodities (Major) - Cu, Ni; (Minor) - Pd, Pt
Development Status: None
Deposit Model: Ni-Cu-PGE in differentiated mafic-ultramafic sill.

Mineral List

3 entries listed. 2 valid minerals.

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