BEGAN MISSING WORK ON 2-28-00 FOR CONDITION OF PAIN IN BOTH KNEES. THIS CONDITION DEVELOPED OVERAN EXTENDED PERIOD OF TIME WORKING IN THE MINE ENVIRONMENT. HE DID HAVE AN INCIDENT ON 1-22-00 OF FALLING ONTO HIS KNEES, HOWEVER, THIS INCIDENT DID NOT CAUSE HIS CONDITION, AS HE INDICATED HE HAD THIS PAIN FOR SOME TIME, JUST WORKING IN MINE ENVIRONMENT.