Some aspects of the mineralogy of CBMM niobium deposit and mining and pyrochlore ore processing - Araxá, MG – Brazil

Aspects of the mineralogical composition and of the distribution of the principal chemical elements in the minerals of the mine ore are presented. Amongst the topics treated are the chemical alteration of the primary ore mineral, the probably mixed origin of barite in the residual enrichment zone and other transformations which occur there, the mining of the secondary ore, and some features of the floatation concentrate and its preparation. (AU)