EMPLOYEE WAS PRYING DOWN A LOOSE COAL OVERHANG WHEN A ROCK MEASURING 7' LONG X 3' WIDE X 8"" THICK BECAME DISLODGED AND FELL TO THE MINE FLOOR. WHEN THE ROCK FELL IT CAUGHT THE PRY BAR AND DROVE IT TO THE GROUND CAUSING THE END HE WAS HOLDING TO STRIKE HIS LEFT THIGH. THIS RESULTED IN A LACERATION THAT REQUIRED SUTURES TO CLOSE.