WORKER EXITED HAUL TRUCK TO PERFORM AN ""AFTER LUNCH"" EQUIPMENT INSPECTION. WHILE PERFORMING THE INSPECTION, HE STEPPED ON A SMALL ROCK,""TWISTING"" RIGHT ANKLE. HE REPORTED THE INJURY TO HIS IMMEDIATE SUPERVISOR, BUT CHOSE NOT TO SEEK IMMEDIATE TREATMENT. APPROX 10 DAYS LATER, HE CHOSE TO SEEK TREATMENT FOR THE INJURY RESULTING IN THE APPLICATION OF A SPLINT.