438. When the working face has been examined in accordance with sections 437 and 437.1, all remnants of drill holes, except those of a seismic excavation, shall be marked in one of the following ways:(1) by a circle in paint or crayon of a colour contrasting with the rock;
(2) by inserting a stick into the holes;
(3) in any other way allowing the remnants of drill holes to be marked.
However, ground support may be installed on the roofs and walls of an underground mine up to the working face before the remnants of drill holes are marked.
O.C. 213-93, s. 438; 33-2024O.C. 33-2024, s. 1611.