Wild One

Occurrence, Active

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-5
Latitude 63.2275
Longitude -146.0606
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Wild One occurrence, west of Fish Lake at an elevation of about 4,000 feet, is 0.4 mile southwest of VABM Wild. It is about 800 feet north of the center of section 32, T. 19 S., R. 9 E., Fairbanks Meridian.

Geologic setting

Geologic description

The rock at this occurrence is the Fish Lake mafic-ultramafic intrusive complex of Late Triassic age, which is believed to be a lopolithic feeder of the Nikolai basalt flows (Nokleberg and others, 1991). A gabbroic unit of the third magmatic cycle of the complex hosts the occurrence, which consists of angular boulders and rubble composed of sulfide-bearing melagabbro and gabbro (W.T. Ellis, unpublished data, 1996). The melagabbro is serpentinized and contains about 5 percent disseminated pyrrhotite and about 1 percent chalcopyrite and pentlandite as inclusions in the pyrrhotite. An American Copper and Nickel Company sample contained 0.14 percent copper, 0.13 nickel, 56 parts per billion (ppb) palladium, and 40 ppb platinum (W.T. Ellis, unpublished data, 1996).
Geologic map unit (-146.062854615378, 63.2270774105203)
Mineral deposit model Ni-Cu-PGE in differentiated mafic-ultramafic sill.
Age of mineralization Late Triassic, the age of the host rock.
Alteration of deposit Serpentinization of the olivine melagabbro.

Production and reserves

Workings or exploration
Grab samples collected by American Copper and Nickel Company contained as much as 0.14 percent copper, 0.13 percent nickel, 56 parts per billion (ppb) palladium, and 40 ppb platinum.
The occurrence is on active Fort Knox Gold Resource.
Indication of production None

References