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The rock fall yesterday afternoon at the underground nickel mine, part of BHP's nickel west operations near Leinster in Western Australia, was due to a seismic event.
One employee was trapped underground in a safety refuge station, around 100m from the fall.
Emergency crews at the mine worked overnight to clear the rock fall and the worker was bought to the surface at around 6:30am today.
"We are pleased that our safety systems worked as planned and that no one was injured in the incident," BHP said in a statement.
Operations at the underground mine have been suspended and BHP is investigating the incident.
