From your link:
WORLD RESERVES
Total world reserves of Nb2O5 are estimated at 5.4Mt (excluding the Seis Lagos deposit) being 88% in Brazilian soil.
Known ore reserves, at the most important producing mines, are
464Mt @ 2.5% Nb2O5 at Araxá (Brazil) and
16Mt @ 0.68% Nb2O5 at St-Honoré (Canada).
Other niobium resources are reported from
Tapira (179Mt @ 0.67% Nb2O5),
Catalão (1.4Mt @ 2.19% Nb2O5) and Salitre (Brazil),
Lueshe Lake, Panda Hill, Chilwa Island and Kalubwe (Africa),
James Bay, Nemegosenda, Lackner Lake, Oka (6.3Mt @ 0.32% Nb2O5) and Manitou Island in Canada.
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