EMPLOYEE STATED THAT HE HAD FINISHED HIS WORK SHIFT AND WAS EXITING HIS HAULER. HE STATED THAT HE HAD NOT HIT OR TWISTED HIS KNEE IN THE PROCESS. HOWEVER, AS HE WAS CLIMBING DOWN THE HAULER LA DDER HE FELT A BURNING SENSATION IN HIS RIGHT KNEE. AFTER REACHING THE GROUND, HE STATED THAT THE BURNING EASED OFF. ON 8-23 HE MISSED WORK DUE TO KNEE AND WENT TO DOCTOR.