EMPLOYEE WAS WALKING FROM PLANT LUNCHROOM TO HIS WORKSITE AT THE SHIPPING SILOS. HE WALKED ACROSS A CONCRETE AREA AND STEPPED OVER AN 8"" HIGH CURB. WHEN HIS FOOT LANDED ON ON DIRT HIS ANKLE RO LLED TO THE OUTSIDE AND HE FELL TO THE GROUND. THE NEXT DAY AN X-RAY SHOWED A FRACTURE.