1. Mineral Resources
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  3. Mineral Resource Data System (MRDS)

Unnamed

Occurrence in Alaska, United States with commodities Chromium, Nickel
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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 10000974
MRDS ID A011647
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -148.65265, 61.62957 (WGS84)
Relative position Top of unnamed 7,100 ft peak, nearly surrounded by glaciers. Meltwater from glaciers feed Wolverine Creek, Carpenter Creek, and other unnamed tributaries of Matanuska River. Sec. 24, T. 18 N., R. 4 E., of the Seward Meridian. Accurate within 1 mile. Locality 46 from Cobb (1972), and locality 35 of MacKevett and Holloway (1977).

Site location context

Political divisions (FIPS codes)

Matanuska-Susitna(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Anchorage C-5(quadrangle 1:63,360 scale)

Anchorage NW(quadrangle 1:100,000 scale)

Anchorage C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Matanuska(hydrologic unit)

Knik Arm(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Chromium Critical Primary
Nickel Critical Secondary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Slight serpentinization of olivine.

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none
Model code 23
USGS model code 9
Deposit model name Alaskan Cr-Pt (PGE)
Mark3 model number 120

Nearby scientific data

(1) -148.65265, 61.62957
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Ultramafic rocks of the Jurassic Wolverine Complex. According to Clark (1972), dunite contains chromite-rich bands 0.5-1 inch thick at the bases of 6 to 12 inch thick layers of olivine cumulate. Chromite bands comprise approximately 5 percent of outcrop and minor anomalous nickel occurs nearby in associated ophiolitic rocks.
  • Age = Lower to Middle Jurassic

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Willow Creek

Comments on the workings information

  • Workings / Exploration = Surface mapping and sampling.

Reference information

Bibliographic references

  • Deposit

    Clark, S.H.B., 1972, The Wolverine complex, a newly discovered layered ultramafic body in the western Chugach Mountains, Alaska: U.S. Geological Survey Open-File Report 522, 10 p.

  • Deposit

    MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000.

  • 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.

  • Deposit

    Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p.

Comments on the references

  • Primary Reference = Clark, 1972

General comments

Subject category Comment text
Deposit Model Name = Podiform chromite or Alaskan PGE (Cox and Singer, 1986; models 8a or 9)
Deposit Other Comments = Concentration of chromite is not economical for mining (Clark, 1972).

Reporter information

Type Date Name Affiliation Comment
Reporter 30-JUL-1998 D.P. Bickerstaff U.S. Geological Survey
Reporter 30-JUL-1998 S.W. Huss 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.