Wyo. Stat. § 30-1-117: Use of water.

Whenever any person, persons or corporation, shall be engaged in mining or milling in this state, and in the prosecution of such business shall hoist or bring water from mines or natural water courses, such person, persons or corporation shall have the right to use such water in such manner, and direct it into such natural course or gulch as their business interests may require; provided, that such diversion shall not infringe on vested rights. The provisions of this section shall not be construed to apply to new or undeveloped mines, but to those only which shall have been open and require drainage or other direction of water.