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