Feather Bed

Prospect in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10000424
MRDS ID A010591
Record type Site
Current site name Feather Bed

Geographic coordinates

Geographic coordinates: -149.26948, 59.98563 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore

Alteration

  • (Local) None reported.

Mineral occurrence model information

Model code 90
USGS model code 24a
Deposit model name Massive sulfide, Cyprus
Mark3 model number 11

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Rock unit name Valdez Group
    Rock description Valdez Group

Nearby scientific data

(1) -149.26948, 59.98563

Comments on the geologic information

  • 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).
  • Age = Cretaceous.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Seward

Comments on the reserve resource information

  • Reserves = None reported.

Comments on the workings information

  • Workings / 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).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010591
USGS Alaska Resource Data File ARDF BS003

Bibliographic references

  • Deposit

    Martin G.C., Johnson, B.L., and Grant, U.S., 1915, Geology and mineral resources of Kenai Peninsula, Alaska: U.S. Geological Survey Bulletin 587, 243 p.

  • Deposit

    Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

  • Deposit

    Cobb, E.H., 1972, Metalic mineral resources map of the Blying Sound quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Stuudies Map MF-440, 1 sheet, scale 1:150,000.

  • Deposit

    Tysdal, R.G., and Case, J.E., 1979, Geologic map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1150, scale 1:250,000.

  • Deposit

    Cobb, E.H. and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.

  • Deposit

    Cobb, E.H., 1972, Metalic mineral resources map of the Blying Sound quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-440, 1 sheet, scale 1:150,000.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Grant, U.S., and Higgins, D.F., Jr., 1910, Reconnaissance of the geology and mineral resources of Prince William Sound, Alaska: U.S. Geological Survey Bulletin 443, 89 p.

  • Deposit

    Grant, U.S., and Higgins, D.F., Jr., 1909, Notes on geology and mineral prospects in the vicinity of Seward, Kenai Peninsula: U.S. Geological Survey Bulletin 379-C, p. 98-107.

Comments on the references

  • Primary Reference = Martin and others, 1915

General comments

Subject category Comment text
Deposit Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a).

Reporter information

Type Date Name Affiliation Comment
Reporter 26-JAN-1999 Jeff A. Huber U.S. Geological Survey