EMPLOYEE WAS SERVICING THE LONGWALL SHEARER. HE HAD PULLED IN 3 SHIELDS OVER HIS WORK AREA. HE WAS CHECKING OIL IN THE RANGING ARM WHEN A STONE FELL FROM THE TOP BETWEEN THE SHIELD TIP AND THE FACE. THE STONE HIT THE TOP OF THE CUTTING DRUM, BROKE UP IN PIECES, AND A PIECE OF THE STONE HIT EMPLOYEE ON HIS RIGHT FOOT.