THE EE BACKED THE MINER FROM A LIFT HE JUST COMPLETED. HE SHUT THE MACHINE OFF. EXAMINED THE RIB AND WENT TO SET POST FOR THE NEXT LEFT. AT THIS TIME A PIECE OF BINDER 24 IN LONG X 18 IN WIDE X4 IN THICK POPPED FROMT HE RIB AND FELL APPROX.5 FT LANDING ON HIS LOWER LEFT LEG. FRACTURE OF LOWER LEG.