EE WAS SPREADING SALT ON THE #2 TAILINGS THICHENER WHEN HE SLIPPED ON ICE/MUD AND STRAINED HIS LEFT KNEE. THE ICE/MUD WAS WET FROM HOSING DOWN AND SALT ON IT, WHICH MADE IT SLIMY. EE COMPLETED THE REST OF HIS SHIFT. HE REPORTED THE LOSS OF THREE (3) SHIFTS ON 11/14/03.