Acid water lagoons, resulting from the mining process, sit at the Yanacocha gold mine in Cajamarca, Peru, on Wednesday, Oct. 21, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
Crushed stones and mined soil of «high fineness» are deposited in a pile before being processed at the Yanacocha gold mine in Cajamarca, Peru, on Wednesday, Oct. 21, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
Workers use backhoes to dig a pool for groundwater stocking at the Yanacocha gold mine in Cajamarca, Peru, on Thursday, Oct. 22, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
Crushed stones and mined soil of «high fineness» are deposited in a pile before being processed at the Yanacocha gold mine in Cajamarca, Peru, on Wednesday, Oct. 21, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
Heavy machinery operates in a pit at the Yanacocha gold mine in Cajamarca, Peru, on Wednesday, Oct. 21, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
A dump trucks is loaded with soil to be hauled away from a pit at the Yanacocha gold mine in Cajamarca, Peru, on Friday, Oct. 16, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
An acid water lagoon, resulting from the mining process, sits at the Yanacocha gold mine in Cajamarca, Peru, on Friday, Oct. 16, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
Engineers install explosives to remove soil while mining in a pit at the Yanacocha gold mine in Cajamarca, Peru, on Thursday, Oct. 22, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
Engineers set off explosions in order to remove soil while mining in a pit at the Yanacocha gold mine in Cajamarca, Peru, on Thursday, Oct. 22, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg
Dump trucks haul soil away from a pit at the Yanacocha gold mine in Cajamarca, Peru, on Thursday, Oct. 15, 2015. Operations at Yanacocha, South America’s largest gold mine, are a joint venture between Newmont Mining Corp., Minas Buenaventura and International Finance Corp. Photographer: Dado Galdieri/Bloomberg