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FILE PHOTO: Rocks of different shades and colors are seen
FILE PHOTO: Rocks of different shades and colors are seen at the Cananea copper mine in Mexico’s state of Sonora February 16, 2010. REUTERS/Daniel Aguilar
FILE PHOTO: Rocks of different shades and colors are seen at the Cananea copper mine in Mexico’s state of Sonora February 16, 2010. REUTERS/Daniel Aguilar