Unnamed (east tip of Sutwik Island)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SW
Quadrangle map, 1:63,360-scale C-4
Latitude 56.5
Longitude -156.9
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is located on the eastern tip of Sutwik Island near Foggy Cape (MacKevett and Holloway, 1977, locality 6). Site location is accurate to within 2 miles.

Geologic setting

Geologic description

The rocks at this site consist of basaltic plug domes intruding sedimentary strata of the Meshik Formation (Detterman and others, 1981). The site has been described as a porphyry-type occurrence consisting of a strongly altered zone in Tertiary hypabyssal and volcanic rocks (MacKevett and Holloway, 1977). No mention is made of ore or gangue minerals present.
Geologic map unit (-156.902033816558, 56.4992594436595)
Mineral deposit model Porphyry copper (Cox and Singer, 1986, model 17)
Mineral deposit model number 17
Age of mineralization Tertiary.
Alteration of deposit The alteration is unknown but it probably includes propylitic and sericitic types.

Production and reserves

Indication of production None

Additional comments

This site is on land selected by the Koniag Native Corporation.