OHS Code

Published Date: July 01, 2009
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Part 36 Mining

Section 664 Underground mine blaster

(1) An underground mine blaster must

(a) personally prepare all primer charges,

(b) make tests for the presence of flammable gas immediately

(i) before the holes are charged,

(ii) before the round is fired, and

(iii) after returning to the working face when a shot is fired,

(c) regulate the quantity of explosive used in each hole, and

(d) ensure that blasting cable is

(i) disconnected and short-circuited and kept short-circuited at the blasting apparatus end until ready to attach the blasting apparatus, and

(ii) staggered in length, at the detonator end, to prevent short-circuiting.

(2) An underground mine blaster must not load or fire explosives if, within 25 metres of a hole,

(a) the atmosphere contains more than 1 percent of methane or 20 percent of the lower explosive limit of a flammable gas,

(b) there is coal dust that has not been treated with a minimum of 6 kilograms of incombustible dust per hole or 75 kilograms of incombustible dust per working face, whichever is greater, or

(c) the area has been thoroughly wetted.

(3) If the atmosphere within 25 metres of a hole contains more than 1 percent of methane or 20 percent of the lower explosive limit of a flammable gas, the underground mine blaster

(a) must not load the blast hole, and

(b) must fill the blast hole with stemming material.

(4) Before firing a round, an underground mine blaster must

(a) post guards not less than 75 metres from the blast area to stop workers from approaching the blast area while the shot is fired and the guards must remain in position until released by the blaster,

(b) couple the cables to the detonator and blasting apparatus, and

(c) take refuge in a manhole, or other safe place, not less than 75 metres from the blast area.

(5) An underground mine blaster must not allow a worker to return to the face after a blast until the expiration of a waiting period of at least 10 minutes or for a longer period determined by the underground mine blaster.