EE WAS HELPING TO LOAD A RAIL CAR WITH MILL GRINIDNG BALLS. THE BARRELS OF BALLS WERE ATTACHED TO A FORK LIFT WITH A BARREL CLAMP. HE ATTEMPTED TO PUSH A CLAMP CLOSED WITH HIS FOOT AND SLIPPED OFF THE CLAMP. HE FELL AGAINST THE 50 GALLON BARREL AND FRACTURED THE LEFT FIBULA. HE DID NOT SEEK MEDICAL TREATMENT OR REPORT THE INCIDENT UNTIL 6-29-00. THE DR TOLD HIM HE COULD RETURN IMME