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Explosives Inspectorate | Alert | No.111 V 1 | 05 April 2023

Unplanned Detonation of Explosives During Rock Breaking Activity

What happened?

An unplanned detonation of misfired explosives occurred when an excavator fitted with a rock-breaker attachment impacted explosives. The operator was shaken but unharmed.

How did it happen?

An unbroken toe in the floor was identified more than a year after a shot was fired in the quarry. Several secondary blasts were fired to break oversize fragments in the same area.

The unbroken toe was blasted along with another secondary blast for oversize rocks. Misfire in the toe was not identified and hence not marked for subsequent digging or rock breaking operations.

Inadequate records of secondary blasting meant the operator did not know the ground being broken contained misfired explosives, and subsequently the rock breaker hit the booster/detonator.

Key issues


Investigations are ongoing and further information may be published as it becomes available. The information in this publication is what is known at the time of writing.

We issue Safety Notices to draw attention to the occurrence of a serious incident, raise awareness of risks, and prompt assessment of your existing controls.

References and further information

  1. Queensland Explosives Act 1999
  2. Queensland Explosives Regulation 2017
  3. Mining and Quarrying Safety and Health Act 1999
  4. Mining and Quarrying Safety and Health Regulation 2017
  5. Australian Standard 2187 Part 2 – Use of Explosives

Authorised by Hermann Fasching - Chief Inspector – Explosives

Contact: Shane Cooper, Senior Inspector of Explosives , +61 7 3199 8023

Issued by Resources Safety & Health Queensland

Safety: This information is issued to promote safety through experience. It is not to be taken as a statement of law and must not be construed to waive or modify any legal obligation.

All information on this page (Unplanned Detonation of Explosives During Rock Breaking Activity - is correct as of time of printing (31 May 2023 7:25 pm).