Police burn mattresses during an operation to destroy illegal gold mining camps in a zone known as Mega 14, at the southern Amazon region of Madre de Dios, July 13, 2015. Production from wildcat miners in Madre de Dios, who sell their ore up the supply chain, made up about 10 percent of national production before President Ollanta Humala launched the harshest crackdown yet on illegal gold mining last year. (Photo by Janine Costa/Reuters)
