05/07/2012-2:00pm EE reported that he had hurt his back at 7:30am when he removed a rock from top of miner. He complained of pain in his lower back on right side; and he wanted to go to the doctor. Appointment was set for 05/09. After his appointment, he stated that he might have ""pulled a muscle"" and needed an MRI. Per Doctor, he returned on light duty on 05/11/2012.