Lemhi Pass (Record #339) rare-earth element deposit in Idaho, United States

Lemhi Pass

Metamorphic rare earth element deposit in Idaho, United States

Geographic location

Country	United States
State or province	Idaho
Geographic location:	-113.616667, 44.95
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Location references

Jackson, W.D., and Christiansen, Grey, 1993, International strategic minerals inventory summary report-- Rare-earth oxides: U.S. Geological Survey Circular 930-N, 68 p.

Geologic characteristics

Deposit type	Metamorphic
Age of deposit	90-99 Ma (Pb-alpha, mon) -- Precambrian
REE minerals	monazite xenotime bastnäsite allanite ancylite loparite churchite
Ore minerals	thorite rutile apatite collophane pryomorphite hematite barite fluorite
Gangue minerals	feldspar quartz ankerite
Host rock types	quartzite phyllite gneiss schist

Nearby scientific information

Geologic map unit	-113.61666666667, 44.95
Other databases	Find additional scientific data near this location

Economic information

Status	Occurrence
Resource estimates	39 Mt @ 0.81% mon or 0.51% REO (1989)

References for resource estimates

Jackson, W.D., and Christiansen, Grey, 1993, International strategic minerals inventory summary report-- Rare-earth oxides: U.S. Geological Survey Circular 930-N, 68 p.

Comments

Veins. Thorium is dominant mineralization.

Bibliographic references

Austin, S.R., Hetland, D.L., and Sharp, B.J., 1970, Mineralogy of the Lemhi Pass thorium and rare-earth deposits: Idaho Bureau of Mines and Geology Mineral Resources Report 11, 10 p.
Harben, P.W., and Kuzvart, M., 1996, Industrial minerals - a global geology: London, Industrial Minerals Information Ltd., p. 330-340.
Möller, P., 1989a, Rare earth mineral deposits and their industrial importance, in
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.
Jackson, W.D., and Christiansen, Grey, 1993, International strategic minerals inventory summary report-- Rare-earth oxides: U.S. Geological Survey Circular 930-N, 68 p.
Newton, Joseph, Adams, C.N., Anderson, A.L., LeMoine, Denis, and Shively, J.A., 1960, Study of two Idaho thorite deposits: Idaho Bureau of Mines and Geology Pamphlet, 58 p.