Minerals such as tungsten, tin, tantalum, gold, cobalt, etc. from conflict or high-risk areas, as well as metal minerals controlled by non-governmental armed groups or illegal military factions through smuggling trade routes, are all considered conflict minerals. Taiyi requires suppliers to comply with the Responsible Business Alliance (RBA) Code of Conduct and only purchase materials from environmentally and socially responsible suppliers. Suppliers are not prohibited from purchasing minerals from the Democratic Republic of Congo and its neighboring countries, and must obtain metals from the Responsible Mineral Assurance Process (RMAP) certified smelters and refineries list confirmed by the Responsible Mineral Initiative (RMI). Refineries and refineries that have not passed RMAP certification or do not meet customer requirements must be removed from the supply chain and committed to conducting due diligence in accordance with OECD requirements