I was reading how China had started to test unmanned trucks, and in researching found that Australia was already a decade ahead.
(2014) Rio Tinto: rolling out the world’s first fully driverless mines
(2018) World-first autonomous trains deployed at Rio Tinto’s iron ore operations - This one is also apparently the ‘worlds biggest robot’
(2021) Rio Tinto to deploy world’s first fully autonomous water trucks at Gudai-Darri


These trucks will be popular quickly once they become cheaper than human labour.
Human labour costs:
All these will be eliminated with unmanned trucks. Heavy duty truck drivers make over $100k so they are good jobs, even with a lot of mines having 12 hours shifts.