On December 2, 2015, China published guidelines for responsible mineral supply chains. The guidelines were developed in cooperation between the China Chamber of Commerce of Metals, Minerals and Chemicals Importers & Exporters (CCCMC) and the OECD. The guidelines align with the OECDs due diligence guidelines on conflict minerals and will initially be voluntary. The announcement of the guidelines was made at the 2015 International Workshop on Responsible Mineral Supply Chains held in Beijing, China.