Yanacocha is an open-pit, cyanide gold mine located 3,900 metres above sea level in Cajamarca. The site is operated by American multinational Newmont Mining Corporation, Peruvian company Minas Buenaventura (part of the Benavides group) and the World Bank International Finance Corporation (IFC). Local residents complained against land grabbing and water pollution from the beginning of operations in Bambamarca and other communities. Accidents included a large mercury spill in Choropampa. Expansion of mining to the Cerro Quilish was stopped. In 2012, a big conflict with several deaths has exploded over a nearby project owned by the same company in Conga. Cajamarca remains one of Perus poorest areas.