Unnamed (Knight Island, northwest of the head of Snug Harbor)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Zn
Ore minerals chalcopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-3
Latitude 60.2765
Longitude -147.778
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located at an elevation of 1,500 feet and about a mile northwest of the head of Snug Harbor. It is located in the SE1/4 section 7, T. 2 N., R. 10 E., of the Seward Meridian, at an approximate elevation of 1,500 feet. This is location 141 of MacKevett and Holloway (1977), location 237 of Cobb and Tysdal (1980), and location S-42 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

Nelson and others (1985) mapped bedrock in this area as Orca Group of early Tertiary age. The occurrence consists of a north-south-trending 30-foot-wide shear zone that cuts greenstone. The shear zone contains as much as 5 percent pyrrhotite and traces of chalcopyrite. A chip sample across the zone contained 14 ppm copper and 50 ppm zinc (Kurtak and Jeske, 1986).
Geologic map unit (-147.78006394478, 60.2759424381188)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration A single chip sample taken across a 30-foot-wide shear zone contained 14 ppm copper and 50 ppm zinc (Kurtak and Jeske, 1986).
Indication of production None

References