Cliffs Natural Resources Inc. Announces Underground Mining Resumes at Oak Grove Mine

Cliffs Natural Resources Inc. CLF today announced that power has been fully restored and underground mining has resumed at its Oak Grove Mine in Alabama. As previously reported, during the evening of April 27, 2011 the Company's aboveground operations at its Oak Grove Mine were struck by severe weather, including a tornado. The Company also indicated that all of Oak Grove Mine's employees have returned to work. However, due to the significant damage to the mine's preparation plant and overland conveyor system, the Cliffs' operations team continues to evaluate the storm's impact to its aboveground operations. Until this evaluation is complete, Cliffs will stockpile the raw coal until the repairs to the overland conveyor system and preparation plant are completed.