In purely pyrochlore type rocks, the ratio of tantalum to niobium is in the region of 1:40 to 1:10, and the extraction of tantalum from such rocks is not economically feasible. In deposits that are rich in tantalum, the main material is a tantalum containing pyrochlore in which the ration of tantalum to niobium is in the region of 1:5 to 1:14. The tantalum pentoxide is in concentrations of from 1 to 5 percent, and the ores from such deposits are considered as an important tantalum-niobium raw material. Ores from such deposits are closer in value to genuine tantalum deposits.
Anchimonomineral accumulations of pyrochlore: New type of tantalum-niobium ores Transl. into ENGLISH from Geol. of Ore Deposits (USSR
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- Mineral Deposits;
- Cost Analysis;
- Transition Metals;