(225 ILCS 705/33.03) (from Ch. 96 1/2, par. 3303)
    Sec. 33.03. For the underground workings, said maps shall show all shafts, slopes, tunnels or other openings, or proposed openings to the surface or to the workings of a contiguous mine; all excavations, entries, rooms and crosscuts; the location or proposed location of the fan and the direction of the air currents; the location of pumps, hauling engines, engine planes, abandoned works, fire wells and standing water; the outcrop line of the seam, if any, on the property; and the location of transformers and motor generator stations. The general outline of all areas in which pillars have been drawn shall be indicated on the map.
(Source: Laws 1953, p. 701.)