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  3. Mineral Resource Data System (MRDS)

West Ospook

Occurrence in Alaska, United States with commodities Copper, Molybdenum, Lead
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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. Mineral occurrence model information
  8. Host and associated rocks
  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 10002122
MRDS ID A013013
Record type Site
Current site name West Ospook

Geographic coordinates

Geographic coordinates: -153.92265, 60.13943 (WGS84)
Relative position Locality is approximately 2.4 km west of the mouth of Ospook Creek, along an unnamed northward flowing stream which drains into Kontrashibuna Lake. This is locality 35 of Nelson and others (1985) and locality 34 of MacKevett and Holloway (1977). Sec. 35, T. 1 N., R. 27 W., of the Seward Meridian. Location is accurate to about 1.6 km.

Site location context

Political divisions (FIPS codes)

Lake and Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Clark A-3(quadrangle 1:63,360 scale)

Lake Clark SE(quadrangle 1:100,000 scale)

Lake Clark(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lake Clark(hydrologic unit)

Kvichak-Port Heiden(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Lake Clark National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Molybdenum Secondary
Lead Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Pyrite Ore

Mineral occurrence model information

Model code 79
USGS model code 21a
Deposit model name Porphyry Cu-Mo
Mark3 model number 2

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Pyroclastic Rock > Tuff
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -153.92265, 60.13943
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Occurrence is associated with sulfide mineralization near contact between Tertiary granodiorite and Tertiary andesite porphyry. Sulfide mineralization is disseminated but mineralization is strongest along fracture zones at the contact of the granodiorite and andesite. Undefined Mo and Pb sulfide minerals occur at this locality. Andesite locally contains 2 to 4 percent disseminated pyrite, magnetite, and trace chalcopyrite. In the vicinity of the site andesite porphyry, tuffs, agglomerates, and other intermediate volcanic rocks are intruded by small gabbro and granodiorite bodies. Soil and stream sediment samples yielded values of up to 1,800 ppm Cu, 183 ppm Mo, and 230 ppm Pb (Resource Associates of Alaska, 1976).
  • Age = Tertiary or younger.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay

Comments on the production information

  • Production Notes = No production

Comments on the reserve resource information

  • Reserves = No reserves

Comments on the workings information

  • Workings / Exploration = Soil and stream sediment samples yielded values of up to 1,800 ppm Cu, 183 ppm Mo, and 230 ppm Pb (Resource Associates of Alaska, 1976).

Reference information

Bibliographic references

  • Deposit

    Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, 109 p.

  • Deposit

    Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska - Supplement to Open-File Report 76-485: U.S. Geological Survey Open-File Report 81-1343-A, 25 p.

  • Deposit

    Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska - Supplement to Open-File Report 76-485: U.S. Geological Survey Open-File Report 81-1343-B, 20 p.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.

Comments on the references

  • Primary Reference = Resource Associates of Alaska, Inc., 1976

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu -Mo ? (Cox and Singer, 1986; model 21a ?)
Deposit Other Comments = Possibility for hydrothermal vein or replacement deposit in the andesite near the granodiorite or along strongly fractured fault zones. Site is in Lake Clark National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1998 M.L. Miller U.S. Geological Survey
Reporter 15-JUN-1998 D.P. Bickerstaff 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.