Rio Tinto stock faces Oyu Tolgoi restart test after seismic event
Published on 11/02/2026 at 10:22 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWSOyu Tolgoi Restart Shapes Copper Outlook
- Rio Tinto is progressively restarting underground mining after safety reviews following the October 29 seismic event.
- Oyu Tolgoi copper production rose 27 percent year over year in the third quarter, increasing the mine's importance to Rio Tinto's growth strategy.
- The company has not quantified production losses or set a timetable for completing the restart.
Rio Tinto stock traded at 74.07 euros on Lang & Schwarz at 10:13 CET on Monday, November 2, 2026, 0.97 percent above the Xetra close of Friday, October 30, at 73.36 euros. The move comes as investors assess the staged restart of underground operations at the Oyu Tolgoi copper mine in Mongolia after a seismic event.
The Northern Miner reported on October 30 that Rio Tinto had begun progressively restarting underground operations after safety reviews. The seismic event on October 29 caused a localized rockfall in a temporary storage zone beside the production area, but Rio Tinto said it had no structural impact on the underground cave or its operating infrastructure.
Safety Review Limits Immediate Visibility
Three employees were injured and two continued to receive treatment for non-life-threatening injuries, according to the report. Rio Tinto did not quantify lost production or provide a timetable for completing the restart, leaving the near-term effect on copper shipments and output open.
The incident matters because Oyu Tolgoi has become a central source of Rio Tinto's copper growth. Copper production at the mine increased 27 percent year over year in the third quarter and 29 percent in the first nine months, while the operation ran at an annualized rate of 450,000 tonnes during the quarter.
Group copper production was little changed at 205,000 tonnes in the third quarter, and first-nine-month group output rose 1 percent. The contrast highlights the mine's growing contribution and the execution risk attached to maintaining its underground ramp-up.
Copper Growth Meets Operating Risk
Rio Tinto owns 66 percent of Oyu Tolgoi, with the Mongolian government holding the remaining 34 percent. The company targets average recoverable copper production of 500,000 tonnes a year from the combined underground and open-pit operations between 2028 and 2036.
Border restrictions have added another operational challenge for the mine. Recent limits on trucks moving copper concentrate through the Ganqimaodu crossing between China and Mongolia curtailed export capacity, according to the Northern Miner report. The seismic event and logistics bottlenecks are separate issues, but both can affect the timing of sales and the visibility of the copper ramp-up.
For investors, the next milestones are the completion of the staged restart, any update on production or shipments, and Rio Tinto's third-quarter results scheduled for Tuesday, November 3. The results should provide the next formal update on operating momentum and the effect, if any, of the disruption.
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Rio Tinto stock at a glance
- Company: Rio Tinto plc
- ISIN: GB0007188757
- Trading venue: Lang & Schwarz
- Quote: 74.07 euros at 10:13 CET on Monday, November 2, 2026
- Daily comparison: 0.97 percent above the Xetra close of 73.36 euros on Friday, October 30, 2026
- Key operation: Oyu Tolgoi copper mine, Mongolia
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