Peruvian authorities have pledged to help a U.S.-based metal manufacturer, Doe Run Resources, in cleaning up the contamination that has affected the central city of La Oroya for the past two decades. Pastures were ruined and livestock of the nearby indigenous communities died as a result of the smoke coming from the foundry. The Cerro de Pasco Corporation established the foundry in 1922, and was succeeded by Centromin, created by the Peruvian government in the 1970s.

Doe Run Resources took on the clean-up obligation upon acquiring Centromin in 1997. The company reports it has so far invested 32 million dollars in the effort.