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  3. Mineral Resource Data System (MRDS)

Unnamed (south shore of Egg Island)

Occurrence in Alaska, United States with commodities Copper, Zinc, Arsenic
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308228
Record type Site
Current site name Unnamed (south shore of Egg Island)

Geographic coordinates

Geographic coordinates: -159.35443, 55.82126 (WGS84)
Relative position This site is located on the south shore of Egg Island in Humpback Bay on the Alaska Peninsula. It is referred to as SBRGX-50 in Wilson and others (1988, locality 24). The location is accurate to within 1,200 feet.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Stepovak Bay D-5 SE(quadrangle 1:24,000 scale)

Stepovak Bay(quadrangle 1:100,000 scale)

Stepovak Bay(quadrangle 1:250,000 scale)

Federal lands

Oceanside Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Zinc Critical Primary
Arsenic Critical Secondary

Materials information

Materials Type of material
Galena Ore
Pyrite Ore
Sphalerite Ore
Calcite Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -159.35443, 55.82126
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This occurrence is in an area mapped as Paleocene to Eocene Tolstoy Formation (Wilson and others, 1995). The occurrence consists of sandstone, shale, and coal beds that are cut by andesite sills and a hypabyssal andesite plug (Wilson and others 1988). Calcite veins occur in an intensely fractured zone in andesite. The veins are as much as 4 inches thick and contain galena, pyrite, and sphalerite, along with inclusions of brecciated andesite. The controlling fractures are probably localized along a thrust fault mapped through this area (Wilson and others, 1988). Samples collected by the U.S. Geological Survey were reported to be anomalous in arsenic, copper, and zinc (Wilson and others, 1988).
  • Age = Tertiary.

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Alaska Peninsula

Comments on the workings information

  • Workings / Exploration = Rock samples 84AWs170, 172-173, collected by the U.S. Geological Survey in the mid-1980's, were reported to be anomalous in arsenic, copper, and zinc (Wilson and others, 1988).

Reference information

Bibliographic references

  • Deposit

    Angeloni, L.M., Wilson, F.H., and Sutlet, S., 1985, Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-470, 179 p., 1 map sheet, scale 1:250,000.

  • Deposit

    Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., scale 1:250,000.

  • Deposit

    Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 map sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Wilson and others, 1988

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)
Deposit Other Comments = This site is located on land interim-conveyed to, or patented by, the Bristol Bay Native Corporation.

Reporter information

Type Date Name Affiliation Comment
Reporter 09-NOV-00 S.H. Pilcher U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.