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The worker was driving the truck as part of rehabilitation activities at the mine.
After being loaded with topsoil, the dump truck was seen to veer off the haul road and come to a stop about 250m away.
The driver was found unresponsive and died despite his co-workers' and ambulance officers' attempts to resuscitate him.
"As a result of the information obtained during the investigation, the Resources Regulator does not consider the worker's death to be work-related," it said.
"Mine and petroleum site operators are reminded of their duty to identify hazards and manage risks to health and safety in accordance with the provisions of the Work Health and Safety Act 2011 and Work Health and Safety (Mines and Petroleum Sites) Act 2013 and Regulations.
"Mine operators should have effective health monitoring programs in place to ensure workers are healthy and fit to work at mining operations and in mine environments.
Regular medical examinations should be undertaken by qualified medical practitioners.
"Workers should maintain a healthy lifestyle and be fit to undertake the work they perform."
