Antler Occurrence, Delta River District, Southeast Fairbanks Borough, Alaska, USA
This page is currently not sponsored. Click here to sponsor this page.
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.
3 entries listed. 2 valid minerals.
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.