Moneta-Porcupine

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals bornite; chalcopyrite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.3167
Longitude -145.9924
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Moneta-Porcupine prospect is along a narrow ridge about 4.3 miles northeast of the mouth of Specimen Creek on Eureka Creek. It is about 0.5 mile north-northeast of the center of section 34, T. 18 S., R. 9 E.

Geologic setting

Geologic description

As originally described by Rose (1965), chalcopyrite and bornite occur in tactite or hornfels about 3 feet thick. As described by Bittenbender and others (2007), the mineralization is in a small xenolith or pendant of light-colored skarn developed from Pennsylvanian or Permian marble that is in serpentinized ultramafic rocks. The skarn is copper stained and has small areas of disseminated bornite. Bornite also occurs in a foot-wide zone in a thin, silicified gabbro dike several feet from the marble. A select sample of the skarn contained 1.65 percent copper and a representative sample across the dike contained 0.34 percent copper.
Nokleberg and others (1991; 1992 [MF]; 1992 [Open-File]) have a notably different description of the prospect. They identified chalcopyrite, bornite, and malachite in and next to north-northeast-trending fractures in meta-andesite that is part of the Slana Spur Formation of Pennsylvanian and Permian age. The sulfide-bearing zones are as much as a meter thick and several meters long.
The prospect was staked by Moneta-Porcupine in 1964 but there is no indication that they did any substantial work on it. Claims held by MAN Resources Corp. were active in 2007.
Geologic map unit (-145.994661722649, 63.3162814949669)
Mineral deposit model Cu skarn associated with serpentinized ultramafic rocks.
Alteration of deposit Mineralization associated with skarn xenolith or pendant in serpentinized ultramafic rocks. Silicification of gabbro dike.

Production and reserves

Workings or exploration The prospect was staked by Moneta-Porcupine in 1964 but there is no indication that they did any substantial work on it. Claims held by MAN Resources Corp. were active in 2007.
Indication of production None
Reserve estimates None.
Production notes None.

References

MRDS Number A011785

References

Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS); D.J. Grybeck (Contractor, USGS)
Last report date 5/13/2012