Carbonatite and placer REE systems represent primary and secondary settings for rare earth mineralization. Carbonatites can provide the primary source of REE-bearing minerals, while weathering, erosion, transport, and sedimentary concentration may enrich resistant minerals in placer deposits. Understanding the source mineralogy and subsequent concentration processes is essential to evaluating grade, mineral liberation, and recovery options.
The following Elements and Minerals may be found in this Deposit Type.
Mineral: Monazite - (Ce,La,Nd,Th)PO₄ - Monazite is an important rare-earth phosphate that commonly contains neodymium and occurs in primary deposits and heavy-mineral placers.