Rio Tinto on Friday said it had begun “progressively” restarting underground operations at its Oyu Tolgoi copper mine in Mongolia after completing safety reviews following a seismic event that temporarily halted mining activities. The miner said a seismic event on October 29 triggered a localised rockfall in a temporary storage area adjacent to the production zone, causing ground vibrations but resulting in no structural damage to the underground cave or operating infrastructure.
02Nov2026
