CREW WAS PREPARING TO TEAR DOWN AND MOVE A RAISE DRILL. THEY WERE HANGING A BLOCK ABOVE THE DRILL IN ORDER TO LIFT IT OFF OF BEAMS. THE INJURED CLIMBED ONTO THE DRILL AND WAS REACHING TO ATTAC H HIS LANYARD, BUT SLIPPED, LOST HIS BALANCE ANDFELL ABOUT 5 FEET. THE INJURED LANDED ON THE GROUND ON HIS SIDE AND BACK.