Peruvian police officers take part in an operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 13, 2015. (Photo by Janine Costa/Reuters)

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)

An area deforested by illegal gold mining is seen in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 14, 2015. The stings at the edge of the Tambopata National Reserve were the first in the southeastern region of Madre de Dios since a crackdown let up in December. (Photo by Janine Costa/Reuters)

A boy carries a dog as he stands after a Peruvian police operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 14, 2015. Peruvian police razed dozens of illegal gold mining camps at the edge of an Amazonian nature reserve this week, part of a renewed bid to halt the spread of wildcatting in a remote rainforest region. (Photo by Janine Costa/Reuters)

A view of an illegal gold mining camp in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 14, 2015. (Photo by Janine Costa/Reuters)

An area deforested by illegal gold mining is seen in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 14, 2015. (Photo by Janine Costa/Reuters)

People leave a camp after a Peruvian police operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 14, 2015. (Photo by Janine Costa/Reuters)

Miners and their families leave a camp after Peruvian police operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 14, 2015. (Photo by Janine Costa/Reuters)

Miners and their families watch a Peruvian police operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 13, 2015. (Photo by Janine Costa/Reuters)

Peruvian police officers take part in an operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 13, 2015. (Photo by Janine Costa/Reuters)

An area deforested by illegal gold mining is seen in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 13, 2015. (Photo by Janine Costa/Reuters)

Miners and their families leave a camp after a Peruvian police operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 14, 2015. (Photo by Janine Costa/Reuters)

A Peruvian police officer burns equipment used by illegal miners during an operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 13, 2015. (Photo by Janine Costa/Reuters)

Peruvian police officers take part in an operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 13, 2015. (Photo by Janine Costa/Reuters)

Miners and their families watch a Peruvian police operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios July 13, 2015. (Photo by Janine Costa/Reuters)

Peruvian police officers take part in an operation to destroy illegal gold mining camps in a zone known as Mega 14, in the southern Amazon region of Madre de Dios, July 13, 2015. (Photo by Janine Costa/Reuters)