Rio Tinto plc is a mining company. The Company focuses on finding, mining, processing and marketing the Earth's mineral resources. The Company's segments include aluminum, copper and coal, diamonds and minerals, and iron ore. The Company's aluminum business includes bauxite mines, alumina refineries and aluminum smelters. The Company's copper and coal business includes approximately four copper operating assets, including in the United States, Mongolia, Chile and Indonesia, and over six coal operations in Australia and South Africa, as well as development projects. The Company's diamonds and minerals businesses include mining, refining and marketing operations across approximately five sectors. The Company operates an iron ore portfolio, supplying the seaborne iron ore trade across the world. Its iron ore mines are located in Australia and Canada.