A picture taken on May 13, 2013 shows untreated phosphate being dropped off on a montain at the end of a conveyor belt at the Marca factory of the National Moroccan phosphates company (OCP/public), near Laayoune, the capial of Moroccan-controlled Western Sahara. As a global leader in the market for phosphate and its derivatives, OCP has been a key player in the international market since its founding in 1920, the worlds largest exporter of phosphate rock and phosphoric acid and one of the worlds largest fertilizer producers.    AFP PHOTOS/FADEL SENNA        (Photo credit should read FADEL SENNA/AFP/Getty Images)