Safety Alert

What Happened

During explosives loading operations at Pit 2, a shot firer discovered that three detonators had been left in the blast pattern from the previous day's aborted shot. The detonators were live and had been covered by approximately 0.5 metres of stemming material. The area had been traversed by a front-end loader earlier in the shift to clear loose rock. Had the loader tracked over the detonators, detonation was possible.

Why It Matters

Unaccounted explosives represent one of the highest-risk scenarios in mining. Detonators are extremely sensitive and can be initiated by mechanical impact. A detonation under a front-end loader could result in fatalities, equipment destruction, and an uncontrolled blast event. This incident reflects a critical failure in the explosives reconciliation process.

Immediate Actions Required

1. 1Immediate reconciliation of all explosive materials on site — account for every detonator and charge
2. 2No mobile equipment to operate in blast areas until the area has been physically inspected and cleared by a licensed shot firer
3. 3Explosives handling procedures to be reviewed — mandatory end-of-shift reconciliation to be enforced with dual sign-off
4. 4All blast crews to receive refresher training on misfire and abandoned shot procedures
5. 5Review communication protocols between blast crews and mining operations for shift handovers

Key Learning

Every detonator must be accounted for. There is no acceptable margin of error with explosives. If a shot is aborted, the blast pattern must be fully reconciled before any equipment or personnel re-enter the area. Never assume the previous crew completed their reconciliation — verify it yourself.

Discussion Points for Toolbox Talk

• •What is the correct procedure for an aborted or misfired shot in your area?
• •How do you verify that a blast area is safe before allowing equipment access?
• •What would you do if you discovered an unaccounted explosive device?