Oyu Tolgoi: a copper operation in Mongolia
Oyu Tolgoi is an open-pit and underground mine producing copper in South Gobi, Mongolia. The sources report 345.2 kt copper in concentrates for CY2025; the basis is 100% (consolidated basis). In copper content, whole-operation output for CY2025 is 345,200 tonnes: about 1.5% of world copper output in 2025; it is one of 11 operations on this site whose output can be stated in copper content.
Who owns and operates it?
| Owner | Interest | As of |
|---|---|---|
| Rio Tinto | 66% | 31 December 2025 |
| Government of Mongolia | 34% | 31 December 2025 |
How much does it produce?
| Period | Output | Basis | Where in the source |
|---|---|---|---|
| CY2025 | 345.2 kt copper in concentrates | 100% (consolidated basis) | Oyu Tolgoi operational data table, p.32; consolidated-basis table p.23 · Rio Tinto |
| CY2024 | 215.0 kt copper in concentrates | 100% (consolidated basis) | Oyu Tolgoi operational data table, p.32 · Rio Tinto |
Between CY2024 and CY2025 the reported figure rose by 60.6%, in the same unit and on the same basis.
How the copper-content figure is worked out. Rio Tinto reports 345.2 thousand tonnes of copper in concentrates for the whole operation, on a consolidated 100% basis. World mine production of copper in 2025 was 23,000,000 tonnes (USGS Mineral Commodity Summaries 2026).
Status: ramping, as of 21 January 2026.
How does it compare?
Other copper operations on this site: Escondida, Cerro Verde, Antamina, Morenci, Grasberg, Kamoa-Kakula, Kamoto Copper Company (KCC), Las Bambas, Buenavista del Cobre, Toquepala. See where copper comes from for the country totals, the country page for Mongolia.
Sources
- Rio Tinto: Fourth quarter 2025 production results / operations review (Form 6-K Exhibit 99.1, 21 January 2026) (stock-exchange filing (SEC 6-K), Q4 and CY2025). Opened 3 November 2026; used: pp.10 (copper summary), 23 (share-of-production table), 32 (Oyu Tolgoi operational data).
- U.S. Geological Survey: Mineral Commodity Summaries 2026: Copper (government statistical summary, 2025 (world and country mine production)). Opened 3 November 2026; used: world and country mine production table.
Method and limits
- Reported, not estimated. Output is the figure the operator or owner published, in the unit it used. This site does not estimate output where none is published.
- Shares. A share divides output in copper content by the USGS world or country total for 2025. Where the operator's year is a fiscal year or the unit is a concentrate or a carbonate equivalent, the share is approximate or not given.
- Whole operation or owner's share. The basis column says which. A joint venture's output is never counted twice.
- Partial list. Only operations with a published figure are listed, so the rank is among those on this site, not among every copper mine. Shares of a country's output mix periods and bases, so treat them as indicative.
- Made with AI assistance, checked against sources. The facts were gathered from the documents above by AI-assisted research and re-checked against those documents by a second, independent pass; the page text is generated from the data. No professional review took place. How the site is made. To report an error, contact us; fixes are logged on the corrections page.