No-one was injured when a small earthquake caused a rock fall at one of BHP Billiton's underground nickel mines in Western Australia's Goldfields.
All staff were safely evacuated despite a power outage, the mining company said.
Geoscience Australia reported a magnitude 3.0 earthquake near Leinster at 11.20pm (WST) on Sunday.
BHP Billiton on Monday said the seismic event resulted in a rock fall at its Perseverance underground mine about 10km north of Leinster.
"No-one was injured and all employees were accounted for," the company said in a statement.
"Contact was maintained with all our affected employees and contractors at all times."
AAP
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