Minera Escondida Ltda. is a Chilean miner which operates the largest copper mine in the world. It produces copper concentrates from copper sulfide ore processed by flotation, and copper cathodes from oxidized ore and low-grade sulfide processed by leaching and bioleaching, respectively. The company's infrastructure includes two open-pit mines (Escondida and Escondida Norte), two concentrators (Laguna Seca and Los Colorados), an electro-winning plant, two slurry pipelines, a port facility (Puerto Coloso) and a seawater desalination plant that provides water for mining operations. BHP Billiton Ltd., its parent company, is developing a 2,500l/s water supply project (EWS) for the mine that includes the country's largest desalination plant.