INSTALLING TAIL DRIVE COVER WITH CO-WORKER. AFTER POSITIONING COVER HE WAS ATTEMPTING TO INSTALL A PIN INTO A RETAINING BRACKET. THE FORK OF THESCOOP BEING USED SLID FROM UNDER THE COVER, STRI KING HIM AND KNOCKING HIM TO THE MINE FLOOR. HE FELL ON A PILE OF CRIBS. HIS LT. WRIST AND RT. SCAPULA WERE FRACTURED. HE WAS LACERATED ON THE LT. CHEEK.