Unnamed (southwest slope of Rusty Hill)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au
Ore minerals chalcopyrite; gold; pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-1
Latitude 63.2049
Longitude -147.4302
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,100 feet on the southwest slope of Rusty Hill, about 2.25 miles north northeast of Denali. The map site is just inside the south boundary of sec. 6, T. 20 S., R. 1 E., of the Fairbanks Meridian. This location is accurate to about 250 feet.

Geologic setting

Geologic description

The country rock at this occurrence is spotted phyllite (Smith, 1981). The deposit consists of hydrothermally altered pyritized phyllite(?), cut along fractures by numerous quartz-sulfide veins as much as a foot thick (Ross, 1933). The sulfide minerals are pyrite, pyrrhotite, and chalcopyrite that carry trace amounts of gold and silver. The prospect has been known since the mid-1930s, and displays a distinct color anomaly.
Geologic map unit (-147.432460569147, 63.2044511561382)
Age of mineralization Hornblende has been K/Ar-dated by Smith (1981) at 64.1 Ma.
Alteration of deposit Hydrothermal alteration has been described as pyritization and quartz veining.

Production and reserves

Workings or exploration Surface sampling only.
Indication of production None