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  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Finger Bay

Occurrence in Alaska, United States with commodities Copper, Gold, Silver
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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. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10003294
MRDS ID A106037
Record type Site
Current site name Finger Bay

Geographic coordinates

Geographic coordinates: -176.60926, 51.82724 (WGS84)
Relative position South of Finger Bay, approximately 1.35 km southeast of where road first reaches Finger Bay. Location is accurate within about 100 m. Elevation about 150 m.

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
Copper Primary
Gold Primary
Silver Primary

Materials information

Materials Type of material
Quartz Gangue

Alteration

  • (Local) Silicification of volcanic rocks and minor introduction of chlorite.

Nearby scientific data

(1) -176.60926, 51.82724
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Geologic map (Fraser and Snyder, 1959) shows locality is near contact where gabbro intrudes other volcanic rock units of the Finger Bay Volcanics. Two samples were collected, one gabbro, the other siliceous andesite(?) containing quartz phenocrysts(?) and sulfide minerals. The andesite is cut by thin stringers of quartz and some fracture/cleavage surfaces are coated with sulfide minerals. The gabbro is coarse-grained and sulfide mineral-bearing. The mineralization is thought to be associated with hydrothermal remobilization along the contact.
  • 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 = Two samples collected during U.S. Geological Survey field work in 1993. Sample 93AWs 101 (gabbro) contained 730 ppm Cu, 0.27 ppm Ag, and 4 ppb Au. Sample 93TL 101 (andesite) contained 2 ppb Au, and 150 ppm Cu (unpublished data, U.S. Geological Survey, 1994)

Reference information

Bibliographic references

  • Deposit

    Fraser, G.D., and Snyder, G.L., 1959, Geology of southern Adak Island and Kagalaska Island, Alaska: U.S. Geological Survey Bulletin 1028-M, p. 371-408, 2 plates, scale 1:125,000.

  • Deposit

    unpublished data, U.S. Geological Survey, 1994

Comments on the references

  • Primary Reference = Fraser and Snyder, 1959

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.