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  3. Mineral Resource Data System (MRDS)

Sweeper Cove

Occurrence in Alaska, United States with commodities Gold, Silver, Lead, Copper, Zinc
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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. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10003288
MRDS ID A106031
Record type Site
Current site name Sweeper Cove

Geographic coordinates

Geographic coordinates: -176.64621, 51.84669 (WGS84)
Relative position Locality described as quarry on hill one half mile southwest of head of Sweeper Cove. U.S. Geological Survey field work in 1993 confirmed location in large quarry. Accurate within a few hundred meters.

Site location context

Political divisions (FIPS codes)

Aleutians West(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Adak C-2(quadrangle 1:63,360 scale)

Adak(quadrangle 1:100,000 scale)

Adak SE(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Western Aleutian Islands(hydrologic unit)

Aleutian Islands(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Aleut Corporation(ANCSA Region)

ANCSA Region NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Primary
Lead Secondary
Copper Secondary
Zinc Critical Secondary

Materials information

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

Alteration

  • (Local) Strong pyritization obscures contact according to Coats (1956), however examination in 1993 did not confirm this.

Mineral occurrence model information

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

Nearby scientific data

(1) -176.64621, 51.84669
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Highly pyritized contact between a dioritic intrusion and country rock (Coats,1956). Country rock is mildly altered and metamorphosed volcanic rocks of the Finger Bay Volcanics. Near the contact between the Finger Bay Volcanics and the dioritic intrusion is a quartz vein containing galena and sphalerite(?).
  • Age = Tertiary

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Aleutians

Comments on the workings information

  • Workings / Exploration = Assay of pyritic rocks showed negligible gold and silver (Coats, 1956). Sampling of vein in 1993 yielded 300 ppb Au, 15 ppm Ag, 100 ppm Cu, 300 ppm Pb, and 700 ppm Zn (sample 93 TL 106).

Reference information

Bibliographic references

  • Deposit

    Coats, R.R., 1956, Geology of northern Adak Island, Alaska: U.S. Geological Survey Bulletin 1028-C, p. 45-67, 1 plate, scale 1:50,000.

  • Deposit

    unpublished data, U.S. Geological Survey, 1994

Comments on the references

  • Primary Reference = Coats, 1956

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein

Reporter information

Type Date Name Affiliation Comment
Reporter 22-FEB-1996 F.H. Wilson U.S. Geological Survey
Reporter 22-FEB-1996 T.D. Light 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.