Unnamed (on Granite Island)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BS
Quadrangle map, 1:63,360-scale C-8
Latitude 59.635
Longitude -149.794
Nearby scientific data Find additional scientific data near this location
Location and accuracy Granite Island is located in Harris Bay about 35 miles southwest of Seward Alaska. The occurrence is located on the southwest side of the island in the first cove north of Granite Cape; it is in the NE1/4 of section 28, T. 6 S., R. 3 W., of the Seward Meridian. This location is accurate to within a quarter of a mile. This is location 116 of Tysdal (1978).

Geologic setting

Geologic description

The occurrence is described as a 10-centimeter-wide quartz vein which crosscuts coarse-grained, foliated biotite granite. Tysdal and Case (1979) have dated the granite as Eocene.
Geologic map unit (-149.796133352062, 59.6344432219386)
Mineral deposit model Insufficient information to classify.
Age of mineralization Eocene or younger; vein cuts Eocene granite.

Production and reserves

Workings or exploration A surface sample contained, 0.2 ppm Au by A.A. and 150 ppm Cu by semi-quantitative analysis (Tysdal, 1978).
Indication of production None

References

MRDS Number A010592
Reporters Jeff A. Huber (Anchorage)
Last report date 1/25/1999