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Tantalum supply from artisanal and small-scale mining: A mineral economic evaluation of coltan production and trade dynamics in Africa's Great Lakes region - ScienceDirect
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877 tonnes of coltan produced in DRC by the end of September 2020, 12% less, compared to the same period in 2019 - Copperbelt Katanga Mining
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Coltan Tantalite Ore : Manufacturers, Suppliers, Wholesalers and Exporters | go4WorldBusiness.com . Page - 1
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