The West Australian premier is pushing for Rio Tinto to retrain the estimated 200 employees whose roles will be replaced by driverless trucks.

Rio Tinto will introduce driverless trucks to a new mine in the Pilbara region later this month, its fifth to be serviced by the expanding fleet.

A Rio Tinto CAT autonomous truck.

WA Premier Mark McGowan said on Wednesday that possible job cuts were concerning for the workers involved and he would write to Rio Tinto to request employees were offered other positions.

"Rio Tinto is a big company. It operates in Western Australia mining iron ore and there's a range of jobs that it needs to be performed," he said.