Unnamed (north of Summit Lake)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Ni
Ore minerals chalcopyrite; pentlandite

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale B-1
Latitude 61.3408
Longitude -144.1777
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a unnamed north tributary to Bridge Creek at an elevation of about 4,500 feet. It is about 2.4 miles north-northwest of the east end of Summit Lake in the NE1/4 section 20, T. 6 S., R. 7 E., of the Copper River Meridian. This occurrence is probably located to within one-half mile. It is locality 106A of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Winkler and others (1981 [OFR 80-892-B]) report that copper and nickel sulfides are disseminated in mafic rocks of the Haley Creek terrane (Winkler and others, 1981 [OFR 80-892-A]). The polydeformed Haley Creek terrane consists of metasedimentary rocks, including marble and metaplutonic rocks that range from peridotite to trondhjemite (Winkler and others, 1981 [OFR 80-892-A]). The protolith ages are not known but much deformation and recrystallization of the Haley Creek terrane probably occurred in the mid-Cretaceous or later.
Geologic map unit (-144.179774090087, 61.340328711711)
Mineral deposit model Magmatic disseminations and segregations of copper and nickel sulfides in mafic rocks
Age of mineralization Not known; the protolith ages of metasedimentary and metaplutonic rocks in the Haley Creek terrane are not known, but much deformation and recrystallization probably occurred in the mid-Cretaceous or later (Winkler and others, 1981 [OFR 80-892-A]).

Production and reserves

Workings or exploration Only surface reconnaissance.
Indication of production None

Additional comments

This occurrence is in Wrangell-St. Elias National Park.

References