Unnamed (on peak 5782)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au
Ore minerals chalcopyrite; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale C-5
Latitude 63.6154
Longitude -146.1302
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 5,400 feet, just east of peak 5782 about one mile north of McGinnis Glacier. The occurrence is about 800 feet southwest of the center of section 15, T. 15 S., R. 8 E., Fairbanks Meridian. The location corresponds to locality N10 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

The rocks at the occurrence are metagabbro of probable Cretaceous age that intrudes metamorphosed Devonian strata. The gabbro body appears to bounded on the north by the McGinnis Glacier fault (Nokleberg and others, 1991). The metagabbro contains sparse quartz veins and local concentrations of chalcopyrite partly oxidized to malachite (Nokleberg and others, 1991).
Geologic map unit (-146.132490024246, 63.614988753125)
Mineral deposit model Copper deposit in gabbro.
Age of mineralization Probably Cretaceous or younger, on the basis of the probable age of the gabbro host rock.
Alteration of deposit Copper minerals are oxidized.

Production and reserves

Workings or exploration No workings are reported at the site. Grab sample 80ZN013 of copper-bearing metagabbro contained 5.5 percent copper, 7 parts per million (ppm) silver, and 0.1 ppm gold (Nokleberg and others, 1991).
Indication of production None