This information circular surveys the iron ore industry of the world. It presents a comprehensive statistical record through 1970 of the U.S. iron ore industry and world trade patterns. The supply position of the United States and the other principal industrial countries of the world is summarized; detailed information is given on iron ore production, consumption, imports, exports, mine capacities, substitutes, properties, and uses. There is a generalized discussion of the technology of mining and smelting iron ore, with a selected bibliography on the current state of these arts. The circular contains a summary economic account of world iron ore resources, and discussions of the structure of the domestic and principal foreign mining industries, iron ore mine employment and labor productivity, research and development, legislation, government programs, and strategic factors.