Mont. Code Ann. § 50-73-203

For the underground working, the map shall show all power distribution and ventilation in mines and all shafts, slopes, tunnels, or other openings to the surface or to the workings of a contiguous mine; all excavations, entries, rooms, and crosscuts; the rise or dip of the seam from the bottom of the shaft, mouth of drift, or slope in either direction to the face of the workings; the location of the fan; the location of the permanent pumps, hauling engines, engine-planes, and fire walls; the location of any standing water which might prove a menace to life or danger to property from flood; and the line of any contiguous surface outcrop of the seam.