Wyo. Stat. § 30-3-110: Pits and quarries.

(a) Reasonable precautions shall be taken to insure the safety of all persons working in and about open excavations, pits and quarries.

(b) Overhanging banks shall not be permitted in any excavation, pit or quarry. Sides and banks shall be sloped to an angle, in view of the nature and material and the depth of the excavation, that will minimize the danger of materials sliding or falling.