EE WAS CLIMBING UP ON TOP OF SECONDARY CRUSHER TO UNPLUG THE FEED CHUTE TO THE SCREEN. EE FELT STRAIN TO HIS LEFT ACHILLES. EE WORKED ON REGULAR DUTY UNTIL ORTHOPEDIC SURGEON PLACED HIS LEFT F OOT IN WALKING CAST ON JUNE 17, 2003. AT THIS TIME, THE ACCIDENT BECAME LOST TIME AND REPORTABLETO MSHA.