EMPLOYEE WAS PUTTING COIL BREAKER IN MINER HEAD - PUT HEAD OF MINER IN TOP OF ROOF TO PUT PRESSURES ON COIL BREAKER - WHEN THEY LEFT THE HEAD BACK DOWN - EMPLOYEE WENT TO GRAB THE COIL BREAKER - IT FLEW OUT AND STRUCK HIM IN THE FACE. EMPLOYEE SUSTAINED CUTS TO THE MOUTH AND LIP (9 STITCHES) , 1 BROKEN AND 1 LOOSE TOOTH, AND A CONCUSSION.