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Coltan (short for columbitetantalites 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 (after niobium's original American name, columbium), and the tantalum-dominant mineral is tantalite.
Copper processing: Copper processing, the extraction of copper from its ores and the preparation of copper metal or chemical compounds for use in various products.
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Chairmans Statement and Management Report. We are pleased to report that the broad trend of improving base metal prices is prevailing during 2017.
Zinc processing: Zinc processing, the extraction of zinc from its ores and the preparation of zinc metal or chemical compounds for use in various products. Zinc (Zn) is a metallic element of hexagonal close-packed (hcp) crystal structure and a density of 7.13 grams per cubic centimetre.
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Environmental impact of the coal industry WikipediaThe environmental impact of the coal industry includes issues such as land use, waste management, water and air pollution, caused by the coal
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