|Rio Tinto plc (Rio Tinto) is engaged in minerals exploration, development, production and processing. The Company's product groups include aluminum, copper, diamonds and minerals, energy, and iron ore. Its major products are aluminum, copper, diamonds, coal, iron ore, uranium, molybdenum, gold, borates, titanium dioxide, salt and talc. The Company's businesses include open pit and underground mines, mills, refineries and smelters, as well as a number of research and service facilities. As of March 16, 2011, the Company held 42.1% interest in Ivanhoe Mines. On December 21, 2010, it completed the divestment of its holdings in Cloud Peak Energy Inc. On January 4, 2011, it sold 61% of Alcan Engineered Products, excluding the Cable division. On April 1, 2011, it acquired Riversdale Mining Limited. In August 2011, the Company sold its talc business to Imerys. In September 2011, Iron Ore Holdings Ltd. sold Pilbara asset to Rio Tinto.