C.R.S. § 34-61-103
34-61-103. Casing of borehole penetrating coal
34-61-103. Casing of borehole penetrating coal. Any borehole penetrating any workable seam of coal shall be cased by the owner of such borehole with a suitable casing, conductor, or drive pipe, so as to shut off all surface water from entering said workable coal seam.