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    Coltan WikipediaColtan (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 niobiu

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    Niobium WikipediaNiobium, formerly known as columbium, is a chemical element with symbol Nb (formerly Cb) and atomic number 41. It is a soft, grey, crystalline, ductile transition metal, often

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    GoogleSearch the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly what you're looking for.ANEKA MIGAS: Daftar perusaha

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    A Comprehensive Approach to Congo's Conflict Minerals ...The 3Ts: Minerals or metals? Before they are refined further up the supply chain, the minerals that are mined in eastern Congo are in or

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