EMPLOYEE WAS MOVING ROCKS IN A CHUTE THAT CLOGGED AT THE TOP OF #2 RAW COAL SILO. WHILE USING A LONG PIECE OF PIPE TO SHOVE THE ROCK HE FELT A PAIN IN HIS LEFT SHOULDER. WAS LATER DIAGNOSED AS A ROTATOR CUFF TEAR AND EMPLOYEE BEGAN TO MISS WORK ON 11-22-2005.