EMPLOYEE WAS WORKING ON 9A-SECTION-UNLOADING SUPPLIES FROM CAR IN TRACK ENTRY AT APPROXIMATELY 12 BLOCK-COMPLETED TASK-BEGAN TO WALK TOWARD SECTION-TRIPPED AND FELL-TRIED TO CATCH SELF-AS HE CONTACTED MINE FLOOR-DISLOCATED LEFT MIDDLE FINGER-REVIEW OF X-RAYS-FRACTURE.