Peru: Mine Probe Test For Humala

In the absence of enforced environmental standards, BHP's waste disposal methods were cheap, primitive and highly toxic.

When livestock began dying after drinking local water, a protest movement emerged. Activists claimed the mine represented a fundamental assault on their way of life, which has co-existed with the local environment for millennia.

Another study by Cusco-based environmental authorities discovered that 26 residents of Espinar had dangerous levels of mercury, cadmium and lead after drinking from the affected rivers.
http://www.greenleft.org.au/node/50713