The operator was unable to safely exit from the cab of the loaded haul truck for three hours after inadvertently hitting the brake or accelerator pedal, causing the truck to tip up and sit on the rear of its tray.
The truck was queued on a ramp and started to roll backwards.
The operator initially failed to detect this movement and reacted suddenly.
The operator reported he may have had a micro-sleep, Mine Safety NSW said in an alert.
"Schedule 2 of the Work Health and Safety Regulation 2014 includes the requirement that the health control plan must address fitness for work, which includes fatigue," it said.
