EMPLOYEE WAS HANGING CURTAIN BESIDE THE ROOF BOLTER, AFTER THEY HAD FINISHED PINNING. THE OPERATOR THOUGHT HE WAS CLEAR AND BACKED THE BOLTER UP, RUNNING OVER HIS LEFT LEG CAUSING A BRUISE. X-RAYS WERE NEGATIVE BUT DUE TO SWELLING AND SORENESS OF THE BRUISE HE STARTED MISSING WORK ON 8-4-04.