THE EE WAS OPERATING A CATERPILLAR 777 HAULAGE TRUCK AND WAS HAULING OVERBURDEN. WHILE TURNING AROUND AT THE DUMP SITE, THE TRUCK BROKE THROUGH THE FROST CAUSING THE TIRES TO SINK INTO THE GRO UND AND TIPPING THE TRUCK ON ITS SIDE. THE IMPACT CAUSED A SPRAIN TO THE EE'S LEFT SHOULDER REQUIRING PRESCRIPTION MEDICATION.