Conveyors for the Frac Sand and Aggregated Industry. Mining, moving or trans-loading of sand and stone. SAND CONVEYORS - Sand Transloading. From Mining to Transloading, IRON CITY SUPPLY has the conveyor, bin, screen, or crusher for the job! ... PORTABLE RAIL CAR UNLOADERS. 24 x 100 Radial Stacker $ 32,100.00. 24 x 80 Radial Stacker $ 23,700.00.