In Inner Mongolia, a convoy of haul trucks rumbles across the dusty, jagged terrain of the Yimin open-pit coal mine. It is a familiar scene in this part of northern China, home to some of the country’s biggest mineral deposits, but a closer look reveals a futuristic twist to this age-old trade: the vehicles operate without drivers. Yimin is one of the five largest open-cast coal mines in China. During peak season, it used to require about 300 trucks, operated by around 1,200 drivers working sh...