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    Coltan WikipediaColtan is a dull black metallic ore from which the elements niobium and tantalum are extracted. The niobium-dominant mineral in coltan is columbite, and the tantalum-dominant mi

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    Outline of mining WikipediaThe following outline is provided as an overview of and topical guide to mining: Mining – extraction of valuable minerals or other geological materials from the ...

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    tantalum niobium mining in nigeria iappleboy.comTantalum, Niobium and Rare Earth Element Mining in Nigeria A profile of Tantalum, Niobium and Rare Earth Element Mining in Nigeria with directori

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