Industrially suitable niobium ore, from which it is cost-effective to obtain niobium concentrates, contains at least 0.15% to 0.20% wt. Nb2O5. In the richest niobium ores known in the world, the Nb2O5content may reach up to 1% to 4%. The leading mineral resources of niobium at the moment are in Brazil (84.2% of total), Canada (9.8%), and Zaire (4.2%). The primary Brazilian ore is the pyrochlore type, which is easier to enrich than the columbite/tantalite ores (Gupta et al., 1994).
Ann: Gifford Creek REE-Nb Carbonatite Update - Mangaroon, page-14
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