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Mount Weld is a mine site in Western Australiamarker, located about 30 km south of Lavertonmarker and 120 km east of Leonoramarker. It ranks as one of the richest major rare earth deposits in the world. In addition to the rare earth oxide deposits, niobium and tantalum deposits are within the Mount Weld carbonatite, an intrusive pipe approximately three km in diameter.

The main deposits are hosted within the soil/regolith horizon that blankets the entire carbonatite and form shallow lenses within 60 m of the surface. The most important rare earth oxide deposit, the Central Lanthanide Deposit, CLD, is located at the center of the carbonatite with the niobium/tantalum and other deposits generally located towards outer fringes. Discovered in 1988, the CLD represents a spectacular enrichment of rare earth deposit sediments. The deposit is believed to be the largest and highest grade of its type in the world.


  2. C.K. Gupta, N. Krishnamurthy, Extractive Metallurgy of Rare Earths, CRC Press, 2005, ISBN 0-415-33340-7

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