Gold Fields Limited (Gold Fields) is a holding company. Gold Fields is engaged in gold mining and related activities, including exploration, extraction, processing and smelting. Gold Fields is a producer of gold and holder of gold reserves in South Africa, Ghana, Australia and Peru. In Peru, Gold Fields also produces copper. It is primarily involved in underground and surface gold and copper mining and related activities. It also has an interest in a platinum group metal exploration project in Finland. Gold bullion is its principal product, which is produced in South Africa, Ghana and Australia and sold in South Africa and internationally. On June 22, 2011, it acquired the 18.9% interest of IAMGold Corporation, which increased its interests in each of the Tarkwa and Damang gold mines from 71.1% to 90.0%. On April 15, 2011, it acquired further interest in Gold Fields La Cima S.A.A. During the year ended December 31, 2011, it acquired a 21.8% interest in Timpetra Resources Limited.