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Labourers work at a lithium plant on the Atacama salt
FILE PHOTO: Laborers work at a lithium plant on the Atacama salt flat in the Atacama desert of northern Chile January 8, 2013. Picture taken January 8, 2013. REUTERS/Ivan Alvarado
FILE PHOTO: Laborers work at a lithium plant on the Atacama salt flat in the Atacama desert of northern Chile January 8, 2013. Picture taken January 8, 2013. REUTERS/Ivan Alvarado