Halibut Bay 42

The Halibut Bay 42 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 42

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)
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 (Exploration): Status = Inactive

Comment (Geology): 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.

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

Comment (Workings): 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).

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

Comment (Deposit): Model Number = 8a, 8b

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

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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