Gravesend
Plot: Gravesend uses a documentary approach to focus on the mining of coltan, employed in the manufacture of cell phones, laptops and other high-tech apparatus. The film cuts between two sites: a technological, highly automated industrial plant in the West where the precious metal is processed for the final production of microelectronic parts, and the central Congo, where miners use simple shovels or their bare hands to extract, wash and collect the ore on leaves