ALONG #10 MAIN LINE BELT- BETWEEN 29 AND 30 CROSSCUT. HIGH AREA PREVIOUSLY RIB OF STONE AND COALHAD FALLEN OUT. MEN WERE MESHING AND BOLTING BAD RIB. THEY WERE 85% FINISHED. EMPLOYEE WAS USING A SLATE BAR TO SCALE A SMALL AREA WHEN A LARGER AREA FELL OUT HITTING HIM.