225 ILCS 710/45.43

Winzes opening directly from the floor of a drift or stope shall be kept covered by a substantial hatch, or shall be planked over, except when in use, or shall be barred off by a substantial railing not less than 3 1/2 feet nor more than 4 feet above the level of the floor, or shall be provided with a gangway not less than 10 inches wide, which gangway shall have a substantial hand railing not less than 3 1/2 feet nor more than 4 feet above the gangway, and the approaches to such gangway at either end shall be protected by a substantial railing not less than 3 1/2 feet nor more than 4 feet above the floor.