| | Report (issue) | SERIES NIOBIUM AND TANTALUM by BJM Diehl , __,..\\ I II I ·\ •: ~··.\.\·(t'\ ,/ !;t Open File Report...SURVEY NAMIBIA 1990 Open File Report MRS 12 2 Abstract Niobium-tantalum mineralisation in Namibia occurs...either as niobium-tantalum pentoxides of the columbite-tantalite series, or as niobium-tantalum minerals...of the pyrochlore group. Minerals of the columbite-tantalite series are associated with rare metal pegmatites...by-products of Tin-mining operations in central Namibia (Uis, Nainais, De Rust). Prominent niobium-tantalum | | | Book | REPUBLIC OF NAMIBIA - MINISTRY OF MINES AND ENERGY GEOLOGICAL SURVEY THE MINERAL RESOURCES OF NAMIBIA FIRST...DIRECTORATE: GEOLOGICAL SURVEY Director: Dr Brian G Hoal II , MESSAGE FROM THE HONOURABLE MINISTER OF MINES...ENERGY Of the several hundred minerals present in Namibia, around sixty have been exploited. some, such as...base metals and industrial minerals have helped Namibia rank amongst the top five mining countries in Africa...terms of production and reserves. In this context, Namibia is a major producer of copper, lead, zinc, cadmium |
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