Magmatic sulfides provide most of the world's supplies of platinum and nickel, among other rare and valuable ores. The author, a ranking authority on the topic, discusses the types of rocks that contain magmatic sulfides, the chemical processes by which they form, and the geological setting of major nickel-copper and platinum deposits throughout the world--in Canada, Australia, the U.S.S.R., South Africa, the U.S.A., and Zimbabwe. Naldrett also examines how theories about ore genesis can be applied in exploring for minerals. The book will be used in graduate-level courses and by economic geologists, geochemists, and geologists in the mining industry. It will also be of interest to members of geological surveys worldwide.