"Mexico environmental agency sues copper mining company over spill", 20 Aug 2014

The Mexican Attorney General for Environmental Protection (PROFEPA)... filed a criminal complaint ...against copper mining companies Buena Vista del Cobre, SA de CV and Minera Mexico following a massive acid spill on August 6 near the US border with Mexico. The spill has affected drinking water for thousands of people in the region, forcing schools to shut down...Authorities believe the spill was caused by defects in newly constructed leaching ponds, which hold the overflow of acids used to separate metal from crushed rock.