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Halibut Bay 50

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 10001692
MRDS ID A012471
Record type Site
Current site name Halibut Bay 50

Geographic coordinates

Geographic coordinates: -154.60135, 57.36243 (WGS84)
Relative position This occurrence is located 5.3 miles north of Anvil Mountain in sec. 32, T. 32 S., R. 33 W., of the Seward Meridian (Foley and Barker, figure 25, 1985, locality 50; Foley and others, 1989, locality 32). Site location is accurate to within several 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 16
USGS model code 8b
Deposit model name Podiform chromite (major)

Host and associated rocks

  • 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 Metamorphic Rock > Serpentinite

Nearby scientific data

(1) -154.60135, 57.36243
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = At this chromite occurrence, one of several in the Halibut Bay ultramafic complex, chromite is present as bands less than 1 inch in thickness, as disseminations, and as massive segregations up to 6 inches across. The mineralized zone is inferred to measure 450 by 5 feet and to have a dip length of 112 feet. The zone strikes N. 5 W. and dips 55 W. The deposit is estimated to contain 26,000 tons of rock grading 6 percent chromite (Foley and Barker, 1985, table 13). A channel sample across a 3-foot stringer zone assayed 14.84 percent chrome. A bulk sample had a head grade of 21.2 percent chromite and a gravity concentrate grade of 53.5 percent chromite. The concentrate had a chrome:iron ratio of 2.6 and contained traces of silver, gold, platinum, and palladium (Dahlin and others, 1985, table A-30). Small showings of chromite were observed 70 feet upslope and 200 feet downslope from the main zone. ? the Halibut Bay ultramafic complex, consisting mostly of gabbro, dunite, pyroxenite, and peridotite, 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 reserve resource information

  • Reserves = the deposit is estimated to contain 26,000 tons of rock grading 6 percent chromite.

Comments on the workings information

  • Workings / Exploration = The deposit is estimated to contain 26,000 tons of rock grading 6 percent chromite. A bulk sample had a head grade of 21.2 percent chromite and a gravity concentrate grade of 53.5 percent chromite, with a chrome:iron ratio of 2.6.

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; model 8b).
Deposit Other Comments = Site is located within Kodiak National Wildlife Refuge.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-SEP-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.