EE WAS OPERATING A DOUBLE BOOM ROOF BOLTER. HE WAS DRILLING A HOLE IN THE MINE ROOF FOR ROOF BOLT INSTALLATION, HE WAS USING A TWO PIECE DRILL STEEL AND AS HE WAS INSERTING THE LOWER SECTION O NTO THE UPPER SECTION THE DRILL STEEL DID NOT ALIGN W/THE DEEP CHUCK ON THE DRILL POT. WHEN HE ATTERMPA TO ALIGN THE DRILL STEEL W/THE DEEP CHUCK THE END OF THE DRILL STEEL SLIPPED OUT AND OF