Rio Tinto Restarts Oyu Tolgoi Underground Operations After Seismic Event

02:33 PM EDT, 10/30/2026 (MT Newswires) -- Rio Tinto (RIO) said Friday that underground operations at the Oyu Tolgoi copper mine in Mongolia are being progressively restarted following the completion of safety reviews. A seismic event on Thursday caused a localized rockfall confined to a temporary storage zone adjacent to the production area. The incident had no structural impact on the cave or its operating infrastructure. Two employees continue to receive treatment for non-life-threatening injuries, according to the company. Shares of Rio Tinto were down 2.2% in Friday afternoon trading. Price: 81.40, Change: -1.85, Percent Change: -2.22