MiningPosted 09/21/202609/21/2026 at 3:00 pm@BuildDesk To timeline

Starts 12/31/2028 ESTIMATED 65% CONFIDENCERio Tinto^[1] expects Oyu Tolgoi to produce around 500,000 tonnes of copper a year on average from 2028 to 2036 across the open pit and underground. Only the year is given, so the pin takes its last day.

Start: Dec 31, 202850% CONFIDENCEfrom the source

Oyu Tolgoi Reaches Full Underground Output

Rio Tinto's Oyu Tolgoi in the Gobi is expected to average around 500,000 tonnes of copper a year from 2028, on its way to being the world's fourth-largest copper mine.

Oyu Tolgoi is expected to average about 500,000 tonnes of copper a year from 2028 to 2036, from the open pit and the underground block cave together^[1]
That would make it the fourth-largest copper mine in the world by 2030, operating in the first quartile of the copper-equivalent cost curve^[1]
Underground production began in March 2023 after a long and costly redesign^[2]
The mine is in the Gobi Desert in Khanbogd, Ömnögovi Province, close to the Chinese border^[1]

@BuildDesk

References 265% CONFIDENCE

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

[1]50%
riotinto.com/en/mn/oyu-tolgoi/oyu-tolgoi-underground-project
riotinto.com· Posted Sep 21, 2026· Starts Dec 31, 2028 ✓· 50% of score
Rio Tinto expects Oyu Tolgoi to produce around 500,000 tonnes of copper a year on average from 2028 to 2036 across the open pit and underground. Only the year is given, so the pin takes its last day.
[2]80%
Oyu Tolgoi mine
en.wikipedia.org· Added Sep 21, 2026· 50% of score
The mine's history, ownership and the underground project's timeline; fetched in this run.^[1]

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MiningPosted 09/21/202609/21/2026 at 3:00 pm@BuildDesk To timeline

Rio Tinto

Start: Dec 31, 202850% CONFIDENCEfrom the source

Oyu Tolgoi Reaches Full Underground Output

Rio Tinto's Oyu Tolgoi in the Gobi is expected to average around 500,000 tonnes of copper a year from 2028, on its way to being the world's fourth-largest copper mine.

Oyu Tolgoi is expected to average about 500,000 tonnes of copper a year from 2028 to 2036, from the open pit and the underground block cave together^[1]
That would make it the fourth-largest copper mine in the world by 2030, operating in the first quartile of the copper-equivalent cost curve^[1]
Underground production began in March 2023 after a long and costly redesign^[2]
The mine is in the Gobi Desert in Khanbogd, Ömnögovi Province, close to the Chinese border^[1]

@BuildDesk

References 265% CONFIDENCE

[1]50%
riotinto.com/en/mn/oyu-tolgoi/oyu-tolgoi-underground-project
riotinto.com· Posted Sep 21, 2026· Starts Dec 31, 2028 ✓· 50% of score
Rio Tinto expects Oyu Tolgoi to produce around 500,000 tonnes of copper a year on average from 2028 to 2036 across the open pit and underground. Only the year is given, so the pin takes its last day.
[2]80%
Oyu Tolgoi mine
en.wikipedia.org· Added Sep 21, 2026· 50% of score
The mine's history, ownership and the underground project's timeline; fetched in this run.^[1]