THE EE WAS DROPPING THE BOLTER CABLE THAT WAS HUNG FROM THE ROOF AND A ROCK (APPROX. 2' X 3' X 2"" THICK) FELL FROM BETWEEN THE BOLTS, STRIKING THE EE'S NECK AND MIDDLE BACK. THE EE LANDED ON HIS L. HAND. THE X-RAY AND CT SCAN WERE NEGATIVE. CONTUSION/BRUISE TO BACK, L. HAND & NECK. THE EE RETURNED TO WORK HIS NEXT SCHEDULED SHIFT ON LIGHT DUTY.