Harmony Gold Mining Co. engages in exploring, extracting, and processing gold, and also searches for uranium, silver, copper, and molybdenum deposits. The company operates nine underground operations in the Witwatersrand Basin, has an open-pit mine on the Kraaipan Greenstone Belt, and owns various surface treatment operations in South Africa. Additionally, the company has interests in the Hidden Valley, an open-pit gold and silver mine, and the Wafi-Golpu project in Morobe Province, Papua New Guinea.