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................................................... Rare earth element ...............................................................

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(Magmatic Fluid Metasomatism) ................... (Autometamorphic Metasomatism) ....................

(Pneumatohydrothermal Metasomatism) ...... (Hydrothermal Metasomatism) ...........................

(Contaminated Metasomatite) .......................... (Breccia Contaminated Metasomatite) .....................

(Banded Contaminated Metasomatite) ........ (Contact Metasomatite) ...........

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.................. Fe-REE ...........................................

REEFe- .................................... ..................................................................

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"REEs"

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Mountain

Pass

Mountain Pass

Bayan Obo

Mountain Pass .