Need coltan ore, large volume, CIF, FOB terms

We need to buy large volume of coltan ore.
We prefer conflict free zones or from following preferred countries areas: Venezuela, Colombia, Bolivia, Peru, Guyana, Panama, Aruba, Curacao, Ivory Cost, Sierra Leone, Rwanda, Uganda, Ethiopia, Somalia, Kenya, Zimbabwe, Nigeria, Madagascar, Namibia, Gambia, Liberia, Burundi, Chad, Gabon, Botswana, Niger, Malawi, Equatorial Guinea, Brazil, DRC. We require all documents and due diligence.