EE WAS STANDING ON A LADDER APPROX. 8' OFF THE MINE FLOOR. HE WAS TIGHTENING BOLTS IN METAL ARCH ROOF SUPPORTS THAT WERE BEING INSTALLED UNDER SUPPORTED ROOF. HE FELL OFF THE LADDER AND LANDED ON THE MINE FLOOR. HE BRUISED HIS BACK, RIGHT FOREARM, AND WRIST. THERE WAS NO DAMAGE OR IMPAIRMENT TO THE OPERATION OR TO ANY EQUIPMENT. NO OTHER FACTORS WERE INVOLVED.