EMPLOYEE REPORTED: OPERATING ROOF BOLTER INSTALLING BOLTS IN THE FACE AREA, WHEN ATTEMPTING TO REMOVE THE DRILL STEEL FROM THE MINE ROOF, THE STEEL HUNG IN THE DRILL HOLE. HE WAS JERKING ON THE STEEL TO REMOVE IT FROM THE ROOF & EXPERIENCED PAIN TO HIS LEFT SHOULDER. RTW THE FOLLOWING DAY, WORKED LIGHT DUTY FOR THE NEXT COUPLE WEEKS.