Recently, residents of the Peruvian city of Cajamarca raised their voices to oppose the expansion of a gold mine to Quilish Mountain, a key water resource for over 100,000 people in the city and valley. Despite local concerns about cyanide used by the mine and a municipal declaration that established Quilish as a Protected Area, the Minera Yanacocha mine (partly owned by Newmont Mining Company of Denver)[joint venture Newmont & Buenaventura] has continued with its plans to expand the mine and is challenging this declaration in court, causing mounting concerns in nearby communities.