OHS Code

Published Date: July 01, 2009
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Part 36 Mining

Section 679 Secondary blasting

(1) If charges are placed directly on top of the material being blasted in an underground mine, an underground mine blaster must ensure that

(a) the charges weigh not more than 0.5 kilograms,

(b) not more than two charges are fired at any one time,

(c) only instantaneous detonators are used,

(d) the surrounding area within a radius of 10 metres is clear of coal dust and dusted with incombustible dust, and

(e) each charge is covered with stemming material and not less than 10 kilograms of incombustible dust.

(2) An underground mine blaster must ensure that, if charges are placed directly on top of the material being blasted in an underground mine, the charges are not fired if the methane content in the surrounding area is more than 0.3 percent (6 percent of the lower explosive limit).

(3) An underground mine blaster must ensure that if charges are placed directly on top of the material being blasted in an underground mine, a refuge or shelter for the blaster is located not less than 150 metres away from the charges.