Mont. Code Ann. § 50-73-202

Every map or plan or, at the option of the operator, a separate map shall show the surface boundary lines contiguous to the workings and pertaining to each mine, all section or quarter-section lines and corners, town lots and streets, the tracts and side tracts of all railroads, the location of all wagon roads, rivers, streams, ponds, buildings, landmarks, and principal objects on the surface within the boundary lines; and in all cases, if of an underground mine, it shall be drawn on a transparency so that it can be laid upon the map of the underground workings and indicate the relative location of the lines and objects on the surface to the excavations of the mine.