Okla. Stat. tit. 45, § 45-421: Shaft collars - Cribbing and timbering - Pipes and air

lines.

All shaft collars shall extend at least eight (8) inches above

the immediate surrounding surface and be provided with a clear and

stable footing and hand rail on two sides of the shaft. A

sufficiently tight fence with a gate to permit access shall inclose

the shaft to prevent persons or animals from reaching the shaft

collar, and such gate shall be kept closed when access to the shaft

is not necessary. The collar of the shaft shall be sufficiently

lighted at all times when in use. All shafts sunk after the

adoption of this act shall be cribbed or timbered continuously from

the top of the shaft to the bottom of the cribbing or timbers. All

pipes, air line, and conduits running down the shaft shall be

securely fastened. All shaft pumps shall be securely covered. When

the ends of tools or material project above the top of the shaft

conveyance, the ends shall be securely fastened to the cable, or

placed in a receptacle. When electric or compressed air operated

hoisting engines are used in sinking shaft, shooting or blasting

shall be done by means of an electric battery or current. All

abandoned shafts, air shafts, drill holes, and shafts not used for

an extended period of time, shall be securely plugged, cased,

covered or fenced.