Conflict Minerals Conflict Minerals Rule Exchange Act of 1934 requires public reporting companies that manufacture or contract to manufacture products containing “conflict minerals” (defined as tin, tungsten, tantalum and gold [3TG]) to conduct due diligence on the source and chain of custody of those conflict minerals to help determine whether they originated from the Democratic Republic of Congo or adjoining countries, and directly or indirectly financed or benefited armed groups in those countries.