On March 5, 2014, the European Commission proposed a draft regulation establishing an EU system of self-certification for importers of tin, tantalum, tungsten, and gold, who choose to import responsibly into the European Union.[1] Self-certification requires EU importers of these metals and their ores to exercise “due diligence” – i.e., to avoid causing harm on the ground – by monitoring and administering their purchases and sales in line with the five steps of the Organization for Economic Cooperation and Development (OECD) Due Diligence Guidance.[2] The goal is to act at the most effective level of the EU supply chain for these minerals and to facilitate the flow of due diligence information to end users. The regulation offers EU importers an opportunity to strengthen existing efforts to ensure clean supply chains when trading legitimately with operators in conflict-affected countries.[3]