In the preparation of maps of the territory being, or to be, developed in mining operations, it shall be the duty of the operator, where practicable, to furnish the district inspector prospective plans suitable to the coal seam and adjacent strata, for the safe economic extraction of coal or other mineral. It shall be the duty of the operator to see that the developments are systematically conducted to preserve the health, safety and welfare of the employees and to prevent the unnecessary leaving of coal or other mineral in the ground.
R.L.1910, § 3959.