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

Unnamed

Occurrence in Alaska, United States with commodity Chromium
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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. Host and associated rocks
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. Reporter information

Geologic information

Identification information

Deposit ID 10001512
MRDS ID A012259
Record type Site
Current site name Unnamed
Alternate or previous names Western Crazy Mountains

Geographic coordinates

Geographic coordinates: -145.53604, 65.79084 (WGS84)
Relative position This occurrence is location no. 3, on figure 4, of U.S. Bureau of Mines Open-File Report 213-84 (Barker, 1984). It is along Preacher Creek, on the west side of the valley between West Crazy Mountains and East Crazy Mountains.

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Circle D-4(quadrangle 1:63,360 scale)

Circle NE(quadrangle 1:100,000 scale)

Circle C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Federal lands

Yukon Flats 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
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate

Nearby scientific data

(1) Dcr
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The western Crazy Mountains are composed of a complexly faulted succession of predominantly clastic, weakly metamorphosed sedimentary rocks. They have either been intruded by or are in fault contact with mafic sills, dikes, and at least several small intrusive, stock-like bodies (Barker, 1984, p. 6). The western Crazy Mountains are bounded on the south by the prominent Preacher Creek Fault (Weber and Foster, 1980), a splay of the Tintina Fault.? A silicified chert-pebble conglomerate exposed on a hillside overlies an altered zone inferred to be a thrust fault. Disseminated grains in the silica matrix were tentatively identified as chromite, and make up about 1 percent of the conglomerate. Petrographic examination indicated that sericite in the matrix and halos of fuchsite (chrome mica) around the chromite grains have developed as alteration products (Barker, 1984, p. 13, 14). Analysis shows 2000 ppm Cr (Barker, 1984, p. 15).

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Circle

Comments on the workings information

  • Workings / Exploration = Surface samples taken.

Reference information

Bibliographic references

  • Deposit

    Barker, J.C., 1984, Concentration of cobalt and other metals in the western Crazy Mountains, interior Alaska: U.S. Bureau of Mines Open-File Report 213-84, 44 p.

Comments on the references

  • Primary Reference = Barker, 1984.

Reporter information

Type Date Name Affiliation Comment
Reporter 14-SEP-98 C.J. Freeman Avalon Development Corporation
Reporter 14-SEP-98 J.R. Guidetti Schaefer Avalon Development Corporation
Reporter 14-SEP-98 Clements, A.S. Avalon Development Corporation

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.