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  3. Mineral Resource Data System (MRDS)

Unnamed

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 10003271
MRDS ID A106014
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -166.16905, 53.74912 (WGS84)
Relative position East side of Sedanka Island. Anomaly no. 25 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 B-1(quadrangle 1:63,360 scale)

Unalaska NE(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
Chalcopyrite Ore
Pyrite Ore
Magnetite Gangue

Alteration

  • (Local) Propylitic alteration having the assemblages pyrite-chlorite +/- epidote and magnetite-epidote +/- chlorite. Christie (1974) reported leaching is weakly developed. Intensely bleached rocks containing up to 10 percent pyrite are locally present. (Possible sericitic alteration?).

Mineral occurrence model information

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

Nearby scientific data

(1) -166.16905, 53.74912
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Color anomaly 6,000 ft (1800 m) by 2,000 ft (600 m) occurs in volcanic rocks of the Unalaska Formation (see Drewes and others, 1961). In the east half of the area, scattered, intensely altered zones of pyrite-chlorite +/- epidote are separated by zones of moderate alteration containing minor pyrite and abundant fracture-controlled magnetite and epidote. According to Christie (1974), the only possible intrusive rocks are intensely bleached and contain 3 to 10 percent pyrite. Chalcopyrite is minor and sporadic in occurrence, where present it occurs as fracture fillings and disseminated in both weakly and intensely altered rock. Where chalcopyrite does occur, grade is less than 200 ppm. Fracturing is weak to moderately developed.
  • Age = Miocene or younger

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 = Brief reconnaissance mapping and a few soil/silt samples showed low level anomalies, most significant was 1.3 to 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?
Deposit Other Comments = See UN005, Sedanka, which occurs to the northwest of this occurrence.

Reporter information

Type Date Name Affiliation Comment
Reporter 08-MAY-1996 Damon Bickerstaff U.S. Geological Survey
Reporter 08-MAY-1996 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.