225 ILCS 705/26.02

Over every shaft that is being sunk or shall hereafter be sunk, there shall be a safe and substantial structure to support sheaves or pulley ropes at a height not less than 15 feet above the tipping place. The landing platform of such shaft shall be so arranged that material can not fall into the shaft while the bucket is being emptied or taken from the hoisting rope. If provisions are made to land a bucket on a truck, said truck and platform shall be so arranged that material can not fall into the shaft.