EMPLOYEE WAS PUSHING COAL WITH THE DION DOZER ON THE RAW COAL PILE. HE WAS IN REVERSE SECOND GEAR WHEN HE STRUCK THE CONCRETE TRUCK DUMP PAD. HE WAS TREATED BY EMS AND TRANSPORTED TO BOONE MEMORIAL WHERE XRAYS WERE NEGATIVE AND RELEASED BACK TO WORK. ON 5/23/05 HE WAS STILL EXPERIENCING BACK PAIN. HE RETURNED TO BOONE MEMORIAL AND SAW DR AND REFERED ON 5/25/05