Tantalite.
Coltan.
Coltan & tantalite.Customs, logistics and shipping
Coltan.
Coltan and jp54..Mediate between buyers and sellers
Iron ore, magnetite, coltan, ferro titanium sand.
Cobalt, coltan, copper ore.
Thermal coal, urea, coltan, cement portland, diesel d2, oil.
Thermal coal, coltan, coke, nickel, copper, gray portland cement.