71. Except in a place where development work is being carried out, no work may be undertaken underground without having at least 2 separate passages to the surface by which workers may evacuate the mine.
The passages shall enable workers to pass from one level of the mine to another.
Notwithstanding the foregoing, a stope may be operated with only one passage to the surface where the following conditions are satisfied:(1) the stope is operated for sampling purposes only;
(2) no other hoisting, exploration, development or new development work is carried out simultaneously with the operation of the stope;
(3) a refuge station complying with the standards in sections 127 and 128 is installed less than 10 minutes from the work station;
(4) the refuge station is equipped with one self-contained breathing apparatus and a minimum utilization time of 60 minutes for each worker assigned to the site and to any related haulage;
(5) the quantity of rock broken is absolutely necessary to render the sample representative of the deposit to be exploited;
(6) the timbering of the shaft and collar frame is kept wet.
O.C. 213-93, s. 71; O.C. 782-97, s. 7; O.C. 1190-2010, s. 6; O.C. 966-2015, s. 2.