Unnamed (northeast side of West Fork Rainy Creek)

Occurrence, Active

Commodities and mineralogy

Main commodities Cu
Ore minerals copper oxide(s); pyrite
Gangue minerals amphibole; calcite; epidote

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-4
Latitude 63.2926
Longitude -145.9454
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,300 feet on a south-facing slope on the northeast side of West Fork Rainy Creek. It is in the SW1/4SW1/4 section 1, T. 19 S., R. 9 E., Fairbanks Meridian. The site corresponds to locality 9 of Rose (1965) and locality S68 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

Minor copper staining occurs in tactite composed of amphibole, epidote, and calcite containing local pods of pyrite (Rose, 1965). The tactite is adjacent to a gabbro dike that is probably an apophysis of an Upper Triassic ultramafic-mafic intrusion (Nokleberg and others, 1991).
Geologic map unit (-145.947657738521, 63.2921816441491)
Mineral deposit model Cu skarn (Cox and Singer, 1986; model 18b).
Mineral deposit model number 18b
Age of mineralization Probably Late Triassic.
Alteration of deposit The country rock adjacent to dike is altered to an amphibole-epidote-calcite skarn. Copper minerals are oxidized.

Production and reserves

Workings or exploration The occurrence is on active claims of MAN Resources.
Indication of production None

References