Minera Yanacocha S.R.L. (Yanacocha), a Lima-based JV between US company Newmont Mining (51.35%), local mining company Buenaventura (43.65%), and Sumitomo Corporation (5%), was established in 1992 to develop and operate the Yanacocha mine, in the Cajamarca district. Its main activities are conducted in four basins: Quebrada Honda, Río Chonta, Río Porcón y Río Rejo. Planned expansion of operations regarding the Conga project was suspended in 2011 due to violent protests over water use. Instead the firm is focused on developing community and social projects.