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Iron Ore Engineering

2019227ton of iron ore from 3050 cents to about 18 centst has been estimated that, by 1893, 75 of the iron ore unloaded at lake erie ports was handled by brown hoisting machinesll of these technologies 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.