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
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Halibut Bay 41 MRDS details
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.
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