ROCK FROM ON TOP OF THE MINER FELL OFF ONTO THE MINE FLOOR LEANING AGAINST THE MINER, HIS CO-WORKER WENT AND MOVED THE CABLE AND THE ROCK FELL STRIKING THE MINER OPR ON HIS KNEE. CAUSE OF THE INJURY WAS COMMUNICATION AND SAFETY AWARENESS. COMPLIANCE WITH RULES AND REGS WAS NOT A FACTOR.MINER PROFICIENCY NOT A FACTOR, MINING EQUIP/ SYSTEMS A FACTOR, PERSONAL EQUIPMENT NOT FACTOR.