EMPLOYEE HAD ENTERED HIS HAULER AND STARTED THE ENGINE AND AS HE WAS EXITING THE HAULER HE SLIPPED AND FELL APPROXIMATELY SIX FEET TO THE GROUND. APPROXIMATELY 6 TO 8 INCHES OF SNOW HAD MELTED THE DAY BEFORE AND SOME RIAN HAD FALLEN THE NIGHT BEFORE. THE GROUNDS WERE VERY MUDDY AND SLIPPERY. THIS CONDITION CONTRIBUTED TO THE ACCIDENT.