Two firms, Singapore-based Trafigura and Canada's Ivanhoe Mines, signed a major deal on Wednesday to export copper along a US-backed rail route from the Democratic Republic of Congo.Ivanhoe Mines' founder and co-chair Robert Friedland thanked the Trafigura-led Lobito Corridor consortium and the governments of Angola and the DRC. Lobito, he said, is "fast becoming one of the most important trade routes for vital copper metal in the world" and would unlock access to minerals in other parts of cent