Magmatic sulphides provide most of the world's supplies of platinum, nickel, chromium, and vanadium, among other rare and valuable ores.The author, a ranking authority on the topic, discusses the types of rocks that contain magmatic sulphides, the chemical processes by which they form, and the geological setting of major nickel-copper and platinum deposits throughout the world - Canada, Australia, the USSR, South Africa, USA, and Zimbabwe.The book also examines how theories about ore genesis can be applied in exploring for minerals. Of use to both industry and academic research, the book will be of interest to members of geological surveys worldwide as well as for postgraduate studies.