Unnamed (northeast 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 61.3302
Longitude -144.1639
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the north side of the ridge between Summit Lake and an unnamed north tributary to Bridge Creek at an elevation of about 5,000 feet. It is in SW1/4 section 21, T. 6 S., R. 7 E., of the Copper River Meridian. This occurrence is probably located to within one-half mile. It is locality 106B of Winkler and others (1981 [OFR 80-892-B]).

Geologic setting

Geologic description

Winkler and others (1981 [OFR 80-892-B]) reported 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 (-144.165972931991, 61.3297291200306)
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 Surface reconnaissance only.
Indication of production None

Additional comments

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

References