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Halibut Bay 44

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 10001688
MRDS ID A012467
Record type Site
Current site name Halibut Bay 44

Geographic coordinates

Geographic coordinates: -154.6244, 57.35826 (WGS84)
Relative position This site is located 5.1 miles northwest of Anvil Mountain in sec. 32, T. 32 S., R. 33 W., of the Seward Meridian (Foley and Barker, 1985, figure 25, locality 44; 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 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Anorthosite
  • 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) -154.6244, 57.35826
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = At this chromite occurrence, one of several known within the Halibut Bay ultramafic complex, massive, sheared chromite is present in rubblecrop composed of interlayered serpentinized dunite, clinopyroxenite, and anorthosite. The layers range in thickness from several inches to several feet, strike eastward, and dip vertically. The strike length of mineralization is inferred to be 225 feet with a dip length of 56 feet. A 3-foot wide zone, exposed in a trench was estimated to contain 20 percent chromite (Foley and Barker, 1985, table 13). Tonnage was estimated at 2000 tons. A high-grade sample from this zone had a head grade of 47.5 percent chromite and a gravity concentrate grade of 65.5 percent chromite. The concentrate had a chrome:iron ratio of 2.8 and contained traces of gold, silver, platinum, and palladium (Dahlin and others, 1985, table A-28).? the Halibut Bay ultramafic complex , consisting mostly of dunite, gabbro, 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 = This deposit is estimated to contain 2,000 tons of rock grading 20 percent chromite.

Comments on the workings information

  • Workings / Exploration = Based on exposures in a 150-foot trench, Foley and Barker (1985, table 13) estimate the zone to contain 2000 tons of rock grading 20 percent chromite. A bulk sample had a head grade of 47.5 percent chromite and a gravity concentrate grade of 65.5 percent chromite. The concentrate gave a chrome:iron ratio of 2.8 and contained traces of gold, silver, platinum, and palladium (Dahlin and others, 1985, table A-28).

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 8a).
Deposit Other Comments = Site is located in Kodiak National Wildlife Refuge.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-98 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.