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Halibut Bay 42

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. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10001686
MRDS ID A012465
Record type Site
Current site name Halibut Bay 42

Geographic coordinates

Geographic coordinates: -154.62746, 57.33631 (WGS84)
Relative position This site is located 3.5 miles northwest of Anvil Mountain in sec. 12, T. 33 S., R. 34 W., of the Seward Meridian (Foley and Barker, 1985, figure 25, locality 42; Foley and others, 1989, locality 32). Site location is accurate to within a few hundred feet.

Site location context

Political divisions (FIPS codes)

Kodiak Island(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Karluk B-2(quadrangle 1:63,360 scale)

Karluk S(quadrangle 1:100,000 scale)

Karluk(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Kodiak-Afognak Islands(hydrologic unit)

Kodiak-Shelikof(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Kodiak 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

Alteration

  • (Local) The ultramafic country rock is serpentinized.

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none
Model code 16
USGS model code 8b
Deposit model name Podiform chromite (major)

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Halibut Bay Complex
    Rock description Halibut Bay Complex
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite > Clinopyroxenite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -154.62746, 57.33631
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = This chromite occurrence, one of several known within the Halibut Bay ultramafic complex, consists of a 3-foot wide zone containing narrow bands of chromite, each less than 2 inches thick , enclosed by serpentinized dunite. The zone strikes N. 5 E. and dips 70 W. and has an undetermined strike length. The grade of the zone is estimated to be 10 percent chromite (Foley and Barker, 1885, table 13). Some disseminated chromite is present for 20 feet on either side of the zone. The combined grade of the zone and surrounding rock is estimated to be 4 percent or less chromite. A bulk sample had a head grade of 16.7 percent chromite and a gravily concentrate grade of 40 percent chromite. The concentrate had a chrome:iron ratio of 1.3 and contained traces of gold, silver, platinum, and palladium (Dehlin and others, 1985, table A-25) ? the dunite is a part of the Halibut Bay ultramafic complex, which also includes gabbro, pyroxenite, and peridotite. the complex occurs within sedimentary units of the Uyak formation of Cretaceous age.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Kodiak

Comments on the workings information

  • Workings / Exploration = Foley and Barker (1985, table 13) estimate a grade of 10 percent chromite for the main zone. A high grade bulk sample had a head grade of 16.7 percent chromite and a gravity concentrate grade of 40.0 percent. The concentrate had a chrome:iron ratio of 1.3 and contained traces of gold, silver, platinum, and palladium (Dahlin and others, 1985, table A-25).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Foley and Barker, 1985

General comments

Subject category Comment text
Deposit Model Name = Podiform chromite (Cox and Singer, 1986; models 8a, 8b).
Deposit Model Number = 8a, 8b
Deposit Other Comments = Site is located in Kodiak National Wildlife Refuge.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-AUG-1998 S.H. Pilcher 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.