Note: This may be done by several methods, such as the use of time cards, numbered cap lamps, check boards with metal checks, having the employee report to a clerk or timekeeper when he enters or leaves the mine, or any other method acceptable to the Division.
If the check list indicates that an unauthorized employee remains in the mine, a prompt search shall be made for the missing man.
Cal. Code Regs. Tit. 8, § 6974