Cliffs Natural unit receives order related to elevated methane level

On August 13, Pinnacle Mining Company, a wholly owned subsidiary of Cliffs Natural Resources Inc., received a 107(a) order related to an elevated methane level along the company’s active longwall gob area. All non-essential personnel were removed from the affected area and production from the longwall was halted. The condition was remediated the same day, with MSHA terminating the order on August 14. The condition cited in the Order referred to above did not result in an accident or injury and are not expected to have a material adverse impact on the Company’s operations at the mine.