OHS Code

Published Date: July 01, 2009
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Part 36 Mining

Section 673 Misfire detonation

(1) An attempt to detonate a misfire must be done as a single hole blast.

(2) If the attempt to detonate a misfire is unsuccessful, an underground mine blaster must ensure that the worker deactivating the misfire

(a) removes the minimum amount of stemming material from the misfired hole required to establish the true direction of the hole,

(b) fires a separate charge parallel to the misfired charge and no closer than 300 millimetres,

(c) after detonating the parallel hole, exercises extra caution while the rock broken by the blast is loaded out of the working face, and

(d) searches for cartridges, their parts or detonators during and after the rock loading is complete.

(3) If there is a faulty electric detonator, an underground mine blaster must ensure that a worker short-circuits the leg wires.