Halibut Bay 44

The Halibut Bay 44 is a chromium mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Halibut Bay 44

Commodity

Primary: Chromium

Location

State: Alaska
District: Kodiak

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Podiform chromite (minor)

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The ultramafic country rock is serpentinized.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chromite

Comments

Comment (Exploration): Status = Inactive

Comment (Reserve-Resource): Reserves = This deposit is estimated to contain 2,000 tons of rock grading 20 percent chromite.

Comment (Deposit): Other Comments = Site is located in Kodiak National Wildlife Refuge.

Comment (Geology): 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.

Comment (Workings): 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).

Comment (Reference): Primary Reference = Foley and Barker, 1985

Comment (Deposit): Model Name = Podiform chromite (Cox and Singer, 1986; model 8a).

References

Reference (Deposit): Foley, J.Y., Burns, L.E., Schneider, C.L., and Forbes, R.B., 1989, Preliminary report of platinum group element occurrences in Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File 89-20, 32 p., 1 map sheet, scale 1:2,500,000.

Reference (Deposit): Foley, J.Y., and Barker, J.C., 1985, Chromite deposits along the Border Ranges fault, part 1, Field investigations and descriptions of chromite deposits: U.S. Bureau of Mines Information Circular 8990, 58 p.

Reference (Deposit): Dahlin, D.C., Kirby, D.E., and Brown, L.L., 1985, Chromite deposits along the Border Ranges fault, southern Alaska, part 2, Mineralogy and results of beneficiation tests: U.S. Bureau of Mines Information Circular 8991, 37 p.

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