Bokan Mountain (Ross-Adams) (Record #160) rare-earth element deposit in Alaska, United States

Bokan Mountain (Ross-Adams)

Alkalic igneous rare earth element deposit in Alaska, United States

Geographic location

Country	United States
State or province	Alaska
Geographic location:	-132.133333, 54.916667
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Location references

Nokleberg, W.J., Bundtzen, T.K., Dawson, K.M., Eremin R.A., Goryachev, N.A., Koch R.D., Ratkin, V.V., Rozenblum, I.S., Shpikerman, V.I., Frolov, Y.F., Gorodinsky, M.E., Melnikov, V.D., Diggles, M.F., Ognyanov, N.V., Petrachenko, E.D., Petrachenko, R.I., Pozdeev, A.I., Ross, K.V., Wood, D.H., Grybeck, Donald, Khanchuk, A.I., Kovbas, L.I., Nekrasov, I.Ya., and Sidorov, A.A., 1997, Significant metalliferous and selected non-metalliferous lode deposits and placer districts for the Russian Far East, Alaska, and the Canadian Cordillera: U.S. Geological Survey Open-File Report 96-513-B, 1 CD-ROM.

Geologic characteristics

Deposit type	Alkalic igneous
Age of deposit	151 ± 5 Ma (Rb-Sr)
REE minerals	kainosite allanite thalenite bastnäsite parisite synchysite monazite britholite tengerite xenotime iimoriite fergusonite samarskite aeschynite loparite polycrase
Ore minerals	zircon columbite thorite uranium thorite uraninite beryllium fluorite pyrite magnetite pyrochlore galena sphalerite rutile rhodonite pyrolusite native silver
Gangue minerals	aegirine riebeckite quartz albite calcite biotite chlorite epidote microcline
Host rock types	peralkaline riebeckite and aegirine granites syenite granite porphyry

Nearby scientific information

Geologic map unit	-132.13333333333, 54.916666666667
Other databases	Find additional scientific data near this location

Economic information

Status	Potential resource REE, Past Prod. U
Resource estimates	6.2 Mt (indicated resource) @0.09-0.46 % REO + 0.09-0.4% Y2O3

References for resource estimates

Warner, J.D., and Barker, J.C., 1989, Columbian and Rare-earth element-bearing deposits at Bokan Mountain, southeast Alaska: U.S. Bureau of Mines Open-File Report 33-89, 196 p.

Comments

REE-bearing pegmatites, dikes, and shear zones/fractures in central part of the complex and in veins in the outer parts & nearby country rocks. Produced 98,000 mt of approx. 1% U3O8. Because dikes generally < 1 m thick and mineralogically complex, economic potential low.

Bibliographic references

Castor, S.B., 1994, Rare earth minerals, in Carr, D.D., ed., Industrial minerals and rocks, 6th edition: Littleton, Colorardo, Society for Mining, Metallurgy, and Exploratin, Inc., p. 827-839.
Mariano, A.N., 1983b, Some characterization data on the Strange Lake complex of Quebec-Labrador and Bokan Mountain, Alaska: confidential report to Molycorp Inc., 26 p.
Woolley, A.R., 1987, Alkaline rocks and carbonatites of the world; Part 1, North and South America: London, United Kingdom, British Museum of Natural History, 216 p.
Warner, J.D., and Barker, J.C., 1989, Columbian and Rare-earth element-bearing deposits at Bokan Mountain, southeast Alaska: U.S. Bureau of Mines Open-File Report 33-89, 196 p.
Mariano, A.N., 1989, Economic geology of rare earth minerals, in Lipin, B.R., and McKay, G.A., eds., Geochemistry and mineralogy of the rare earth elements: Washington, D.C., Mineralogical Society of America Reviews in Mineralogy 21, p. 309-348.
Nokleberg, W.J., Bundtzen, T.K., Dawson, K.M., Eremin R.A., Goryachev, N.A., Koch R.D., Ratkin, V.V., Rozenblum, I.S., Shpikerman, V.I., Frolov, Y.F., Gorodinsky, M.E., Melnikov, V.D., Diggles, M.F., Ognyanov, N.V., Petrachenko, E.D., Petrachenko, R.I., Pozdeev, A.I., Ross, K.V., Wood, D.H., Grybeck, Donald, Khanchuk, A.I., Kovbas, L.I., Nekrasov, I.Ya., and Sidorov, A.A., 1997, Significant metalliferous and selected non-metalliferous lode deposits and placer districts for the Russian Far East, Alaska, and the Canadian Cordillera: U.S. Geological Survey Open-File Report 96-513-B, 1 CD-ROM.