China’s top two copper producers have signed concentrate supply deals with Chilean miner Antofagasta for the first half of 2020, two sources familiar with the matter said on Tuesday. Jiangxi Copper Co and Tongling Nonferrous Metals Group signed the contracts earlier than usual because of concerns about the future supply of copper concentrate, the sources said. Concentrate is partially processed copper ore that is the feedstock used to make refined metal. Contracts for annual supply are typically not agreed until around the time of the Asia Copper Week conference in Shanghai in November. These early contracts ... (full story)