EE WAS OPERATING A ROOF BOLTING MACHINE. HE WAS DRILLING A HOLE FOR AROOF BOLT INSTALLATION. A PIECE OF ROCK FELL FROM THE ROOF AROUND THE HOLE BEING DRILLED AND LACERATED THE EE ON TOP OF HIS RIGHT WRIST. THERE WAS NO DAMAGE OR IMPAIRMENT TO THE MINING OPERATION. THE INJURY DID NOT INVOLVE COMPLIANCE, JOB SKILLS, MINER PROFICIENCY, TRAINING, ATTITUDE, PROTECTIVE ITEMS,OR DEVICES.