EMPLOYEE WAS WALKING DOWN A SLOPED AREA FROM THE UPPER PLANT TO THE LOWER PLANT TO PICK UP A HAUL TRUCK, HE SLIPPED AND FELL, LANDING ON HIS LEFT HIP. THE EMPLOYEE WAS DIAGNOSED WITH A DEEP TISSUE BRUISE TO HIS LEFT UPPER THIGH AND HIP. THE EMPLOYEE LEFT THE LIGHTED WORK AREA WHERE VISIBILITY WAS POOR AND THE GROUND CONDITIONS WERE SLIPPERY DUE TO RAIN.