Gold Fields said it is interested in buying AngloGold Ashanti Ltd.’s Iduapriem mine in Ghana as the precious metal producer seeks to increase output from West Africa by about two-thirds to one-million ounces. Gold Fields is also looking for opportunities to buy mines in Mali, Burkina Faso and Senegal, the Johannesburg-based company’s vice president for West Africa, Alfred Baku, said in an interview in Ghana’s capital, Accra. AngloGold said it doesn’t comment on speculation around its assets.