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columbite mining in the philippin one area in nigeria for minning of tin ore and columbite By the 1940s, Nigeria was a major producer of tin, columbite, and coal.... BINDING HEADS OF …
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Coltan (short for columbite–tantalites and known industrially as tantalite) is a dull black metallic ore, from which the elements niobium and tantalum are extracted. The niobium-dominant mineral in coltan is columbite …
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Columbite is a black, crystalline mineral group and the main ore of niobium which is also called columbate, niobite and niobite-tantalite [(Fe, Mn)Nb2O6], it is also a niobate of iron and manganese. Columbite …
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