Iron Ore Engineering

ton of iron ore from 30-50 cents to about 18 cents.It has been estimated that, by 1893, 75% of the iron ore unloaded at lake erie ports was handled by brown hoisting machines.All of these tech-nologies required a large labor force to shovel the ore into tubs or to move the ore piles in the hold to allow the clam or grab buckets to pick it up.