Umicore processes a variety of materials from the lead industry, including Pb-Cu-dross, Pb-Cu-mattes, speiss (a complex mix of Pb, Cu, Ni, As, Sb, and Sn), precious metals-containing doré slags, flue dusts, and residues with typical metal value. In primary lead smelting, impurities from concentrates are often found in intermediate streams, and we provide impurity management services to lead smelters worldwide. By treating these intermediates, we add value while assisting in impurity management. In secondary lead smelting, Umicore also offers an outlet for copper as dross or matte.