EE WAS ASSISTING THE ROOF BOLTER OPERATOR INSTALL A CURTAIN BOARD. AS THE INJURED EE WAS HOLDING THE CURTAIN BOARD IN PLACE, A PIECE OF ROOF ROCK FELL FROM BETWEEN ROOF BOLTS STRIKING HIM ON T HE BACK. THE INCIDENT CAUSED A CONTUSION & STRAIN TO THE EE'S BACK. HE WILL BE INSTRUCTED TO ALWAYS CHECK THE ROOF & RIB CONDITIONS IN HIS WORK AREA PRIOR TO PERFORMING A TASK. THIS INCIDENT