For CBMM in the Araxá region, The average Nb2O5 content of 2.59% is found in pyrochlore, which is a mineral of carbonatite origin. Pyrochlore is low grade niobium.
In Brazil, there is 40% to 50% Nb2O5 in columbite and so far Brazil has quite good columbite.
For CBMM in the Araxá region, The average Nb2O5 content of 2.59%...
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