EE WAS WORKING AT THE REFUSE SILO, USING A REMOTE CONTROL UNIT TO OPEN AND CLOSE THE FLOPGATE TOLOAD SLATE TRUCKS. AFTER LOADING THE LAST IN A GROUP OF TRUCKS THE EE WALKED TOWARD THE BIN TO CHECK THE SILO GAUGE. A SMALL PIECE OF SLATE WHICH HAD BEEN LODGED IN THE FLOPGATE BROKE OFF ANDFELL, STRIKING THE EE ON THE FOREHEAD.