An aerial view of open pits of CODELCO's Andina (L) and Anglo American's Los Bronces copper mines with Olivares glaciers in the background (top L) at Los Andes Mountain range, near Santiago city, November 17, 2014. The rock glaciers of the Chilean central zone, a huge source of water for the basins of the capital, are said to be threatened by the environmental impacts of hydroelectric and mining projects, according to environmental activists Greenpeace. (Photo by Ivan Alvarado/Reuters)

A view of “La Paloma” glacier next to the open pits of CODELCO's Andina and Anglo American's Los Bronces copper mines (not pictured) at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of the open pit of Anglo American's Los Bronces copper mine with Aconcagua mount (C) in the background, America's highest peak in the Andes mountain range, and several glaciers, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of roads as mining trucks travel along at CODELCO'S Andina copper mine at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

Francisco Ferrando (rear L), a glaciologist, and Greenpeace director in Chile Matias Asun (rear R), speak with the media in front of “La Paloma” glacier next to the open pits of CODELCO'S Andina and Anglo America's Los Bronces copper mines (not pictured) at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

A view of “La Paloma” glacier (C) next to the open pits of CODELCO'S Andina and Anglo American's Los Bronces copper mines (not pictured) at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of Anglo American's Los Bronces copper mine with several glaciers in the background at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of a science camp on the Olivares glacier next to the open pits of CODELCO'S Andina and Anglo American's Los Bronces copper mines (not pictured) at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of open pits of CODELCO's Andina (L) and Anglo American's Los Bronces (front) copper mines with Olivares glaciers in the background (top) at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of the open pit of CODELCO'S Andina at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of Anglo American's Los Bronces copper mine at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of Olivares glacier with CODELCO'S Andina copper mine in the background at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)

An aerial view of Anglo American's Los Bronces copper mine at Los Andes Mountain range, near Santiago city, November 17, 2014. (Photo by Ivan Alvarado/Reuters)