EE WAS OPERATING A CONTINUOUS MINER IN THE #1 ENTRY WHEN A RIB ROLL OCCURRED STRIKING HIM ON THE LEFT LEG. THE ROLL MEASURED APPROX 3' LONG BY 2' WIDE BY 3-6' THICK. HE WORKED A TOTAL OF 6 SHIFTS BEFORE SEEKING MEDICAL ATTENTION FOR THIS ACCIDENT. ON 4-18-02 HE VISITED THE DOCTOR,TOLD TO STAY OFF WORK, AND RESCHEDULED. ON 4-22,DIAGNOSED WITH POSSIBLE TORN LIGAMENTS.