EE HAD COMPLETED BOLTING THE 2ND ROW OF BOLTS INBELT ENTRY WHEN THE SCOOP OPERATOR ARRIVED WITH SUPPLIES. HIS CO-WORKERS UNLOADED SUPPLIES & HE PROCEEDED BACK TO FINISH BOLTING. WALKING ON THE OFFSIDE OF THE RIB A PIECE OF ROCK 8' X 2' X 1""-3"" FELL STRIKING HIM ON THE RIGHT SIDE OF THE HEAD & BODY. TRANSPORTED TO HOSPITAL. X-RAYS NEGATIVE BUT RECEIVED SUTURES OVER RIGHT EYE.