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Unnamed

Occurrence in Alaska, United States with commodities Gold, Copper, Lead, Silver, Mercury, Zinc
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Geologic information

Identification information

Deposit ID 10003290
MRDS ID A106033
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -176.61539, 51.91502 (WGS84)
Relative position Quarry at north end of Adak Naval Air Station developed area. About 1 mi (1.6 km) east of southern tip of Andrew Lake.
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Geographic areas

Country State
United States Alaska

Commodities

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

Materials information

Materials Type of material
Pyrite Ore
Chalcedony Gangue
Epidote Gangue

Alteration

  • (Local) Propylitic alteration characterized by silicification and replacement of mafic minerals by epidote and chlorite.

Nearby scientific data

(1) -176.61539, 51.91502
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Comments on the geologic information

  • Geologic Description = Mineral occurrence is located in quarry in volcanic rocks of either the Finger Bay Volcanics or the Andrew Lake Formation. Dominant lithology is a massive andesite(?) cut by faults trending approximately east-west. A zone of iron-staining, possibly centered on a sheer zone or fault cuts through the quarry. Stained zone is approximately 10-15-m-wide and the included rocks contain variable amounts of pyrite.
  • Age = Tertiary

Economic information

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 = A number of samples (93AWs 14a-i) were collected during brief U.S. Geological Survey reconnaissance studies in 1993. Samples yielded as much as 4 ppb Au, 0.11 ppm Hg, 310 ppm Cu, 0.31 ppm Ag, 270 ppm Pb, and 190 ppm Zn.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106033
USGS Alaska Resource Data File ARDF AD009

Bibliographic references

  • Deposit

    UNPUBLISHED DATA U.S. GEOLOGICAL SURVEY, 1994

  • Deposit

    Unpublished data, U.S. Geological Survey, 1994

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