The Democratic Republic of the Congo (DRC) is the world's largest producer of cobalt ore, and a major producer of copper and diamonds. The latter come from Kasai province in the west. By far the largest mines in the DRC are located in southern Katanga province (formerly Shaba), and are highly mechanized, with a capacity of several million tons per year of copper and cobalt ore, and refining capability for metal ore. The DRC is the second-largest diamond-producing nation in the world, and artisanal and small-scale miners account for most of its production.