EE WAS PREFORMING PRE-SHIFT INSPECTION AND SPREADING SALT IN AREA UNDER CONE CRUSHER AND CONVEYORS. HE SLIPPED ON SNOW COVERED ICE AND STRUCK HEAD ON GROUND. SAFETY GLASSES FRAME APPEARS TO HA VE CAUSED A 1"" LACERATION ABOVE LEFT EYE AND A SMALL LACERATION BELOW THE CORNER OF LEFT EYE. HE HAD VISITED AREA THROUGHOUT THE WORK WEEK WITHOUT INCIDENT.