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Rio Tinto pauses Oyu Tolgoi underground copper mine after seismic event

29th October 2026

By: Reuters

  

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Rio Tinto on Friday said it had paused underground operations at its Oyu Tolgoi copper project in Mongolia after seismic activity along a rock fault zone caused ground vibration.

The miner said three employees sustained injuries, and no fatalities were reported.

Oyu Tolgoi is one of the world's largest known copper and gold deposits and is central to Rio Tinto's copper growth strategy. The miner owns 66% of the project, with the Mongolian government holding the remainder.

Rio Tinto also flagged delays affecting all vehicles passing through the Ganqimaodu border crossing between China and Mongolia, which have reduced the availability of trucks to transport copper concentrate from Oyu Tolgoi.

Edited by Reuters

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