The main mining centres are at Ouenza and Djebel Onk near the eastern border with Tunisia and at El-Abed in the west. Extensive deposits of high-grade iron ore are worked at Ouenza, and major deposits of medium-grade ore exist at Gara Djebilet near Tindouf. Nearly all the high-grade iron ore from the open-cut works at Ouenza is used to supply the domestic steel industry. Reserves of nonferrous metal ores are smaller and more scattered. These include sizable quantities of zinc and lead at El-Abed near Tlemcen—the source of most of the country’s production—and of mercury ore at Azzaba. Phosphate deposits ...(100 of 17999 words)