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Good afternoon, I have a seller of 58 MT of Coltan (columbite tantalum) in Kenya in a bonded warehouse in Mombasa City. If interested, please Product Specifications: Ta2O5 => 31.15% Nb2O5 => 32.06% Mn3O4 => 14.24% Fe2O3 => 9.03% SiO2 => 6.91% Radiation => 0.84nSv/H