Feather Bed

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale BS
Quadrangle map, 1:63,360-scale D-7
Latitude 59.986
Longitude -149.267
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Feather Bed occurrences are located on the Resurrection Peninsula about 11 miles south of Seward, Alaska. The occurrence consists of two locations, one along the shore of Humpy Cove (formerly called Sunny Bay by Martin and others, 1915) and the main showing is about a mile and a half east of the shore in the SW1/4 of section 22, T. 2 S., R. 1 W., of the Seward Meridian. This is location 2-3 of Cobb (1980, OFR 80-621) and location 106a-106b of Tysdal (1978). The location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

Tysdal and Case (1979) described the bedrock geology in this area as Cretaceous, pale to dark green aphyric to porphyritic pillow basalt with subordinate pillow breccia, tuff, and siltstone.
The shoreline occurrence consists of a few shallow pits containing pyrite- and chalcopyrite-bearing float. The main occurrence mineralization is contained in a shear zone that holds four stringers of nearly pure chalcopyrite. The stringers, the largest of which is 7 inches thick, assayed 14 to 19 percent copper (Martin and others, 1915 p. 234-235). The shear zone strikes north-south and is about vertical. This zone has been traced from an elevation of 2,500 feet to 3,500 feet (Martin and others, 1915 p. 234-235).
Geologic map unit (-149.269135165124, 59.9854398090512)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a).
Mineral deposit model number 24a
Age of mineralization Cretaceous.

Production and reserves

Workings or exploration Surface samples assayed 14 to 19 percent copper in the main showing. No assay results reported for the shoreline occurrence (Martin and others, 1915).
Indication of production None