Okla. Stat. tit. 45 § 419
All shaft hoisting engineers handling men or material must be over twenty-one (21) years of age, familiar and experienced with hoisting engines of the design which he is to operate and must have been examined by a reputable physician and be able to show certificate of health from said physician, showing no physical or mental conditions or symptoms that might cause a loss of faculties so as to interfere with the safe and efficient performance of his duty at all times. It shall be the duty of the hoisting engineer to watch over all machinery, including hoisting rope or cable, in his charge and ascertain that all the equipment and conditions are in conformity with the law. In the event of any defect in such equipment, or violation of the law concerning same, he shall immediately report same to the mine superintendent or other person in charge of the mine operation. The hoisting engineer shall, at the beginning of his shift and at the middle of his shift, inspect his hoist equipment, particularly as to the brakes and clutch and test same by at least one complete hoisting trip before men are allowed to enter the tub or shaft conveyance. Where a station man or tub hooker is used in any shaft, it shall be his duty to supervise the loading and unloading of men or material at the bottom of the shaft, and he shall supervise the signaling to the hoisting engineer. The loading and unloading of men at the top of the shaft at the beginning and end of each shift shall be supervised by an employee of the operator.
Okla. Stat. tit. 45, § 419