Abandoned Mine Site Characterization and Cleanup Handbook - EPA be considered in designing and implementing inactive mine site cleanup projects. Following the initial mining step ore is reduced in size by the crushing and/or grinding different from tailings piles created as a result of thickened tailings disposal. A ready supply of atmospheric oxygen is required to drive the oxidation.
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Coltan - Wikipedia Coltan is a dull black metallic ore from which are extracted the elements niobium and tantalum. The production and sale of coltan and niobium from African mines dropped has encouraged international buyers to avoid Congolese coltan on ethical grounds: "take care in obtaining materials from lawful sources.
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