Cliffs Natural Resources Inc is a mining and natural resources company founded in 1847 in United States. The Company is engaged in supplying iron ore pellets to the North American steel industry from its five iron ore mines and pellet plants located in Michigan and Minnesota. Additionally, the Company operates an iron ore mining complex in Western Australia. The Company operates in two geographical segments including U.S. Iron Ore and Asia Pacific Iron Ore. The U.S. Iron Ore segment is comprised of its interests in five U.S. mines located in Michigan and Minnesota that provides iron ore to the integrated steel industry. In Michigan, the Company operates the two iron ore mines, Empire mine and Tilden mine. In Minnesota, it operates one iron ore mine, Hibbing mine. The other two iron ore operations in Minnesota, United Taconite mine and Northshore mine. The Asia Pacific Iron Ore segment is located in Western Australia and provides iron ore to the seaborne market for Asian steel producers; and consists solely of its wholly owned Koolyanobbing operation. The Koolyanobbing operations serve the Asian iron ore markets with direct-shipped fines and lump ore. The lump products are fed directly to blast furnaces, while the fines products are used as sinter feed. The variation in the two export product grades reflects the inherent chemical and physical characteristics of the ore bodies mined as well as the supply requirements of its customers. The Company's competitors include Anglo American PLC, BHP Billiton, Fortescue Metals Group Ltd., Rio Tinto plc and Companhia Vale do Rio Doce, among others. The Company's mining and limited exploration activities are subject to various laws and regulations governing the protection of the environment.