Unnamed

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Zn
Other commodities Ag; Co
Ore minerals unidentified brassy sulfides
Gangue minerals olivine; peridotite

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale B-2
Latitude 62.333
Longitude -153.949
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is in a saddle separating two northeast-trending ridgelines at an elevation of 5,500 feet (1,677 m) in the NW1/4 sec. 20, T. 26 N., R. 25 W., of the Seward Meridian. The reporter visited the site in 1981.

Geologic setting

Geologic description

This unnamed occurrence is hosted in a northwest-trending northward-dipping mafic sill of Late Triassic (?) age, a feeder for mafic volcanics of the Tatina River Volcanics, a unit of the Mystic subterrane. Unidentified, brassy, disseminated sulfides - probably iron sulfide - occur at the base of the mafic sill. Foley (1987) reports values of 210 ppm copper, 56 ppm cobalt, 330 ppm zinc, and 0.5 grams/tonne silver from the sulfide-bearing sills.
Geologic map unit (-153.951220088526, 62.3323839683999)
Mineral deposit model Disseminated Cu-Ni-Co (Cox and Singer, 1986; model 5b).
Mineral deposit model number 5b
Alteration of deposit None.

Production and reserves

Workings or exploration The sill swarm was mapped by the reporter in 1981 (Bundtzen, Kline, and Clough, 1982). Foley (1987) reports values of 210 ppm copper, 56 ppm cobalt, 330 ppm zinc, and 0.5 grams/tonne silver from the sulfide-bearing sill.
Indication of production None
Reserve estimates None.

Additional comments

Similar to Robert's PGM (MG030), Unnamed (MG048), and Chip-Loy (MG032) deposits and prospects.

References