If an underground mine uses signals for communicating with a plant operator, the mine’s safety and health management system must provide for the following—
(a) a signals code;
(b) a copy of the code to be posted—(i) in the operator’s view; and(ii) at each other place where it is appropriate for persons to contact the operator by using the code;
(c) a copy of the code posted at a place mentioned in paragraph (b) (ii) to be easily accessible by each coal mine worker at the mine;
(d) each person who may need to use the code to be aware of the code and where copies of the code are posted.