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Left: Coragyps atratus, Black vulture; Right: Polyborus plancus , Southern crested caracara. From Zapla, Palpalá. 

Left: Coragyps atratus, Black vulture; Right: Polyborus plancus , Southern crested caracara. From Zapla, Palpalá. 

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The study of a waste dump from a steel mill complex covering an area of approximately 154,400m 2 in Zapla, Jujuy, Argentina, has shown a remarkable restoration of the terrain and landscape as a consequence of weathering of the slag and deposited cyclone dust. The material behaved as natural laterites disintegrating and being incorporated into a new...