Unnamed (on Bushy Islands)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Zn
Ore minerals chalcopyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SD
Quadrangle map, 1:63,360-scale C-5
Latitude 57.70728
Longitude -133.43693
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the small island at the northwest end of the Bushy Islands; it is near the center of section 16, T. 48 S., R. 74 E.

Geologic setting

Geologic description

Copper staining and minor chalcopyrite are in quartz stringers that follow the foliation of Cretaceous phyllite (Brew and Grybeck, 1984; Kimble and others, 1984). A 5.2-foot chip sample across the mineralization contained 700 ppm copper, 1,600 ppm zinc, and 0.015 ounce of silver per ton.
Geologic map unit (-133.438645385693, 57.7069434042201)
Mineral deposit model Quartz stringers with chalcopyrite in phyllite.
Age of mineralization Cretaceous or younger based on the age of the host rock.

Production and reserves

Workings or exploration None other than sampling by government geologists.
Indication of production None

Additional comments

The occurrence is in the Tracy Arm-Fords Terror Wilderness Area which is closed to mineral exploration and mining.

References