Bear Lodge Mountains (southern) (Record #10) rare-earth element deposit in Wyoming, United States

Bear Lodge Mountains (southern)

Carbonatite rare earth element deposit in Wyoming, United States

Geographic location

Country	United States
State or province	Wyoming
Geographic location:	-104.45, 44.483333
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Location references

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.

Geologic characteristics

Deposit type	Carbonatite
Age of deposit	38.3 to 50.5 Ma (K-Ar, san,)
REE minerals	monazite xenotime ancylite bastnäsite
Ore minerals	strontianite hematite thorite uranium niobium fluorite barium magnetite
Gangue minerals	aegirine-augite actinolite quartz feldspar calcite biotite hornblende
Host rock types	trachyte phonolite minor syenite and nepheline syenite carbonatite

Nearby scientific information

Geologic map unit	-104.45, 44.483333333333
Other databases	Find additional scientific data near this location

Economic information

Status	Large, low-grade resource of REE-Th
Resource estimates	726 Mt @ 1.306% REO (1978)

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 and disseminated deposits. Samples ranged from 112 to 30000 ppm with REE more abundant than Th. Area incompletely explored.

Bibliographic references

Mariano, A.N., 1981a, Rare earth mineralization in the Bear Lodge carbonatite complex, Crook County, Wyoming: unpublished report to Molycorp, 53 p.
King, J.K., 1991, Rare earth elements and yttrium in Wyoming: Geological Survey of Wyoming Mineral Report 91-3, 125 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.
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.
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.