EMPLOYEE WAS CLEANING OUT SILO #1 BIN VALUE THAT WAS FULL OF CHUNKS. ANOTHER EMPLOYEE WORKING WITH HIM CLOSED THE VALUE WITHOUT CHECKING FIRST & VALUE CLOSED ON HAND. EMPLOYEE THOUGHT HE WAS O K, JUST SCRATCHED. ON 6/8/02 HE WENT TO E.R. BECAUSE OF NAGGING PAIN. ON 6/10 HE WAS NOTIFIED OF HAIRLINE FRACTURE AT WRIST AREA.