A RECLAIM OPERATOR FROM RAW MATERIALS SUSTAINED A LACERATION INJURY TO HIS LEFT HAND WHILE WORKING AT THE TOP OF THE R25 ROD MILL BUILDING. HE WAS JACKHAMMERING AT #15 TRIPPER TO CLEAN DIRT OF F THE SIDE OF THE TRIPPER. SOME MUD ON THE SIDEWALL FELL OFF AT ONCE TAKING THE JACKHAMMER AND HIM ALONG WITH IT. HIS HAND STRUCK AGAINST AN UNKNOWN OBJECT TO CAUSE THE LACERATION.