You're not thinking at the right financial scale. A Caterpillar 797 haul truck costs in the range of $5 million USD (not including delivery to remote Australia

You're not thinking at the right financial scale. A Caterpillar 797 haul truck costs in the range of $5 million USD (not including delivery to remote Australia). Sounds expensive, right? Well it's paid for within 4-6 months of being put into operation. So worker salaries, pensions, etc. for the driver are a minuscule portion of the money being made from a mine. There's no reason to stiff them.