Lundin Mining says it's buying an 80 per cent stake in the Candelaria and Ojos del Salado copper mine in Chile from Freeport-McMoRan Inc. for US$1.8 billion. The remaining 20 per cent stake in the mines will continue to be owned by Sumitomo Metal Mining Co., Ltd and Sumitomo Corp. The Toronto-based mining company says the acquisition will capitalize on long-term copper production from the northern region of Chile.