Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan.
Coltan tantalite and precious stones, and gemstones..
Non ferrous ores like iron, aluminum, copper, manganese, lead, zinc, bauxite, magnetite, hematite, coltan, chromite, industrial minerals like kaolin(china clay), silica sand, petroleum products like diesel en590, crude oil, petcoke..
Coltan.
Coltan, ferrous steel.Mining, transportation and shipping