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Coltan (short for columbitetantalite and known industrially as tantalite) is a dull black metallic ore from which the elements niobium and tantalum are extracted.
FLUORIDES. Environmental Health Criteria 227. This report contains the collective views of an international group of experts and does not necessarily represent the
The 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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