Gilnow

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-1
Latitude 60.9501
Longitude -147.2696
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is at or near sea level on the west side of Long Bay in the S1/2 section 14, T. 10 N., R. 12 E., of the Seward Meridian. This is location S-114 of Jansons and others (1984). The location is accurate to within half a mile.

Geologic setting

Geologic description

The occurrence is in slate and consists of a 100-foot-wide shear zone containing disseminated pyrrhotite (Jansons and others, 1984). Nelson and others (1985) describe the bedrock geology in this area as sedimentary rocks of the Orca Group of Tertiary age. The U.S. Bureau of Mines sampled this occurrence; the two grab samples they collected contained 33 and 45 ppm copper (Jansons and others, 1984).
Geologic map unit (-147.271663826784, 60.9495585609944)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the occurrence is in slate of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration The U.S. Bureau of Mines sampled this occurrence; two grab samples contained 33 and 45 ppm copper (Jansons and others, 1984).
Indication of production None

References