SANTIAGO : Chile's state-run Codelco, the world's largest copper producer, said on Tuesday it agreed on a $466 million loan from the Japan Bank for International Cooperation and an additional $200 million loan co-financed with a commercial bank. The loan is intended to help supply Japanese manufacturers with a stable supply of copper concentrates, both institutions said. "Since Japan relies solely on imports for copper concentrates, it is essential to secure a long-term, stable supply of copper