AFTER MINING THE CENTER PASS IN R-107 EE MOVED THE MINER OVER & STARTED MINING THE R PASS. AFTERLOADING A COUPLE OF CARS IN THE PROCESS OF LOADING ANOTHER CAR THIS RIB BLEW OUT, HITTING EE & PINNING HIS LEGS UNDER A SLAB, APPROX 8""TO 10"" THICK FROM THE CALF OF HIS LEG DOWN. THE ENTIRE SLAB WAS 14'X22'X80'. EE WAS STANDING BY THE BACK SHUTTLE CAR TIRE AND WAS BLOWN INTO THE TIRE