Colorado Revised Statutes Title 34. Mineral Resources § 34-24-105. Opening or abandonment of mine--maps

(1) It is the duty of the operator of every mine to notify the director prior to the opening of any mine or the abandonment of any mine.

(2) Before a mine is abandoned or closed, the owner shall make a complete survey of all workings not represented on the maps and plans of such mine, and he shall enter the results on the maps to show the most advanced workings in the mine in relation to the boundary of the property. The owner shall file a copy of the updated map with the division.