As more workers are given the green light to walk off the job, the mining giant is downplaying the impact of Pilbara's first strike in more than 25 years.

For the first time in more than two decades, iron ore workers in WA's Pilbara are set to take industrial action.

BHP Group faces its first Port Hedland strike since 2000 as workers plan an eight-hour stoppage that could disrupt up to A$120 million in daily iron ore