"Borborema Pegmatitic Province (BPP), Paraiba State. The province is one of the world’s most important sources of tantalum, rare earth elements (REEs), and beryllium."
"The tantalum grades in Brazil vary according to the region and their occurrences. Paraíba and Rio Grande do Norte have higher grades, ranging from 20 to 45% Ta2O5,"
"Borborema Pegmatitic Province (BPP), Paraiba State. The...
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