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

Makushin Valley SE

Occurrence in Alaska, United States with commodities Copper, 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. 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 10003267
MRDS ID A106010
Record type Site
Current site name Makushin Valley SE

Geographic coordinates

Geographic coordinates: -166.71907, 53.8991 (WGS84)
Relative position Southeast side of Makushin Valley. Anomaly no. 6 of Christie (1974).

Site location context

Political divisions (FIPS codes)

Aleutians West(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Unalaska C-3(quadrangle 1:63,360 scale)

Unalaska NW(quadrangle 1:100,000 scale)

Unalaska SE(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Fox Islands(hydrologic unit)

Aleutian Islands(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Alaska Maritime National Wildlife Refuge(National Wildlife Refuge)

National Wildlife Refuge FWS(Type of land area)

FWS(Federal land areas administered by FWS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Silver Secondary

Materials information

Materials Type of material
Pyrite Ore
Magnetite Gangue

Alteration

  • (Local) Possibly propylitic and argillic alteration. Partial leaching, fractures largely leached.

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4

Nearby scientific data

(1) -166.71907, 53.8991
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Color anomaly in Unalaska Formation (see Drewes and others, 1961) associated with porphyritic diorite. Diorite is weakly altered, contains miarolitic cavities, less than 0.5 percent pyrite and more than 2 percent magnetite. Fracturing is local strongly developed ans strikes east and northeast. No chalcopyrite seen. Zone containing more than 2 percent pyrite is roughly 600 ft (180 m) by 4,000 ft (1220 m).
  • Age = Cenozoic

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 = Single sample reported, reconnaissance mapping. Sample showed 90 ppm copper and 1.4 ppm silver.

Reference information

Bibliographic references

  • Deposit

    Drewes, Harold, Fraser, G.D., Snyder, G.L., and Barnett, H.F., Jr., 1961, Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-S, p. 583-676.

  • Deposit

    Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

Comments on the references

  • Primary Reference = Christie, 1974

General comments

Subject category Comment text
Deposit Model Name = Copper porphyry

Reporter information

Type Date Name Affiliation Comment
Reporter 03-MAY-1994 Damon Bickerstaff U.S. Geological Survey
Reporter 03-MAY-1994 F.H. Wilson 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.