Electric Furnace showing ingot mold cars and hot metal cars. The average size is 125 to 175 tons with some reaching a capacity of 300 tons and the melt may take from 90 minutes to 3 hours. 17. B&O track over coal and ore piles with roll mill and gas plant in background. 18. Unloading Coal barge facilities 1 ton of coal will produce 1500 pounds