Halibut Bay 46

The Halibut Bay 46 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 46

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 (major)

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

Comment (Reserve-Resource): Reserves = This deposit is estimated to contain 43,000 tons grading 7 percent chromite. Concentrates of the chromite indicate inferior quality.

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

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

Comment (Workings): Workings / Exploration = This deposit is estimated to contain 43,000 tons of rock grading 7 percent chromite (Foley and Barker, 1985, table 13). A bulk sample had a head grade of 7.7 percent chromite and a gravity concentrate grade of 34.6 percent chromite. The chrome:iron ratio of the concentrate was 1.1 and contained traces of gold, silver, platinum, and palladium (Dahlin and others, 1985, table A-28).

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = This chromite occurrence, one of several within the Halibut Bay ultramafic complex, consists of segregations and disseminations of magnetic chromite within a 35-foot thick dunite layer which is bounded by clinopyroxenite. The dunite layer strikes N. 10 W. and has an inferred strike length of 750 feet and an inferred dip length of 187 feet. Foley and Barker (1985, table 13) estimate that the layer contains 43,000 tons of rock grading 7 percent chromite. A bulk sample of the mineralized dunite had a head grade of 7.7 percent chromite and a gravity concentrate grade of 34.6 percent. The concentrate had a chrome:iron ratio of 1.1 and contained traces of gold, silver, platinum, and palladium (Dahlin and others, 1985, table A-28). No estimates of recoverable chromite were made because of the inferior quality of the concentrate.? The Halibut Bay ultramafic complex, consisting mostly of dunite, gabbro, pyroxenite, and peridotite, occurs within sedimentary units of the Uyak formation of Cretaceous age

References

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.

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.

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