EE WAS BOLTING IN THE NUMBER THREE ENTRY IN THE LEFT CROSSCUT INSTALLING AN OUTSIDE BOLT. AS HE WAS DRILLING A HOLE THE STAB JOCK SLIPPED OFF A LEDGE RESULTING IN THE CANOPY STRIKING HIM ON TO P OF HIS HEAD. HE COMPLETED HIS SHIFT. HE WORKED THE ENTRIED FOLLOWING DAY. HE SAUGHT MEDICAL ATTENTION AFTER HE COMPLETED HIS 4-5-02 SHIFT. HE BEGAN MISSING WORK ON 4-8-02. HE WAS RELEASED W