Mo. Rev. Stat. § 293.470
The director of the division of mine inspection and his assistants shall have the power, and it is hereby made their duty, to stop the operation of and close any coal mine or part thereof where poisonous damps exist, where rotten ropes or unsafe cages are used, or where a safe escape way is not provided, for all employees. Any person or persons violating the provisions of this section, and any member or stockholder or officer of any company or corporation who shall violate the provisions of this section, shall be deemed guilty of a misdemeanor, and on conviction thereof be punished by a fine of not less than twenty-five dollars nor more than one hundred dollars, or imprisonment in the county jail thirty days nor more than ninety days, or by both such fine and imprisonment for each and every separate offense.
§ 293.470, RSMo