He describes a technology-enabled focus on productivity, which means, for instance, using sensors to make sure that eye-wateringly expensive mining trucks can operate without disruption.

The company sought to increase its production there beyond 100 mining trucks a year.

As more rock needs to be moved (using large electrically powered draglines and diesel and electric mining trucks) the production cost will also increase.

Eventually this was replaced by the road which switchbacked up to the summit and was capable of supporting 20-ton mining trucks.

Diesel-electric arrangements are used on many railway locomotives, ships, large mining trucks, and some bulldozers.