TOKYO -- The Japan Bank for International Cooperation will join forces with South Korean and German government-affiliated financial institutions, as well as other lenders, on a $2.5 billion loan to support a Chile copper mine expansion that is expected to help Japanese companies secure a supply of the metal, Nikkei has learned. JBIC will provide up to $950 million for the project at the Centinela mine, which is operated by U.K.-headquartered Antofagasta and Japanese trading house Marubeni.