Halibut Bay 41

The Halibut Bay 41 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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Halibut Bay 41

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 (Geology): Geologic Description = This chromite occurrence, one of several known within the Halibut Bay ultramafic complex, consists of a 50-foot wide zone of elongated lenses of disseminated to massive chromite in serpentinized dunite. The zone strikes N. 10 E. and dips steeply to the west. It is exposed for 250 feet along strike and has an estimated dip length of 62 feet. Foley and Barker (1985, table 13) estimate that the deposit contains 80,000 tons of rock grading 5 percent chromite. A bulk sample had a head grade of 22.4 percent chromite and a gravity concentrate grade of 50.6 percent. The concentrate had a chrome:iron ratio of 2.1 and contained traces of gold, silver, palladium, and platinum (Dahlin 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.? A floatation sample of peridotite from an unknown localilty within the complex contained 11.8 percent copper, 1.55 percent nickel, 0.083 percent cobalt, 0.159 ounce per ton platinum, 0.336 ounce per ton palladium, 0.133 ounce per ton gold, and 20 ounces per ton silver (Foley and others 1989). Minerals identified in the concentrate include chalcopyrite, cobaltian pentlandite, pyrrhotite, stannopalladinite, uvarovite, and villamanite. Grab samples from this locality contain up to 7,700 ppm chrome, 3,626 ppm copper, 839 ppm nickel, 420 ppb platinum, and 480 ppb palladium.

Comment (Reserve-Resource): Reserves = the deposit is estimated to contain 80,000 tons of rock grading 5 percent chromite.

Comment (Exploration): Status = Inactive

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

Comment (Workings): Workings / Exploration = Foley and Barker (1985, table 13) estimate 80,000 tons of rock grading 5 percent chromite at this occurrence. A high grade bulk sample had a head grade of 22.4 percent chromite and a gravity concentrate grade of 50.6 percent. The concentrate contained traces of gold, palladium, and platinum and had a chrome:iron ratio of 2.1.

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

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

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.

The Top Ten Gold Producing States

These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.