THE HOISTMAN WAS LOWERING THE 3 BOOM JUMBO DRILLINTO THE SLOPE (APPROX. 8 TONS). THIS WAS THE FIRST TRIP THIS DRILL MADE IN THE HOLE. APPROX 157FEET. IT WAS APPARENT THE DRILL WOULD HIT THE LAST ARCH STEEL INSTALLED. THE DRILL WAS STOPPED& BELLED BACK UP THE SLOPE. HE WAS BELLED TO STOP SO THE RAIL COULD BE ADJUSTED FOR CLEARANCE. THE DRILL ROLLED DOWN THE SLOPE, BRAKES SET.