Australian Capital Territory Numbered Regulations Australian Capital Territory Numbered RegulationsThis is the audible warning system for use in above-ground blasting operations in a mine or quarry:
(a) a series of 3 short audible signals must be sounded, followed by a pause of at least 3 minutes, during which the blasting area must be checked to ensure everyone in the area is in a position of safety;
(b) 2 short audible signals must be sounded;
(c) after a 1-minute pause, a continuous audible signal must be sounded;
(d) the blast must be fired as soon as practicable after the continuous audible signal has sounded for 10 seconds, after which the signal must stop;
(e) the area must be checked and if all dust and toxic gases have dispersed, and in all other respects the area is safe for return, for the ‘all clear', a continuous audible signal must be sounded for 10 seconds.