Occurrence in Alaska, United States with commodities Copper, Gold

Geologic information

Identification information

Deposit ID 10003295
MRDS ID A106038
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -176.62927, 51.86585 (WGS84)
Relative position Topographic knob at east end of dock area at Adak Naval Air Station.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary
Gold Primary

Materials information

Materials Type of material
Chlorite Gangue
Zeolite Gangue


  • (Local) Silicification and chloritization of volcanic breccia.

Nearby scientific data

(1) -176.62927, 51.86585

Comments on the geologic information

  • Geologic Description = Silicified volcanic breccia cut by 60-m-wide andesite(?) dike. Coats (1956) mapped knob as a plug, however the bulk of the outcrop along the road is breccia. Interstitial spaces between breccia fragments are locally zeolite(?) filled. Dike has a well developed chilled margin.
  • 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 2a-d) were collected during brief U.S. Geological Survey reconnaissance studies in 1993; all were copper-bearing in the 110-160 ppm Cu range. A few samples of andesite and andesitic volcanic breccia yielded low-level gold in the 2-6 ppb range. Float samples were found of iron-stained andesite(?) that contained 3-5 percent unidentified sulfide minerals.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106038
USGS Alaska Resource Data File ARDF AD008

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    unpublished data, U.S. Geological Survey, 1994

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