Tomago smelter: an aluminum operation in Australia

Tomago smelter is an aluminum smelter producing aluminum in Tomago, New South Wales, Australia. The sources report 574 '000 tonnes (kt) of primary aluminum, 100% basis ('Total' column) for CY2025; the basis is 100% of the smelter, as printed by Rio Tinto, a joint-venture holder. Measured as primary aluminum, whole-operation output for CY2025 is 574,000 tonnes: about 0.8% of world aluminum output in 2025 and about 38% of Australia's; it is one of 28 operations on this site whose output can be stated in primary aluminum.

Who owns and operates it?

Owners of Tomago smelter
Owner	Interest	As of
Rio Tinto Rio Tinto interest as printed in its 2025 annual report production table. The other owners are not named in the source.	51.6%	31 December 2025
Hydro Hydro's integrated annual report lists Tomago at 12.4% in its table of aluminium metal plants.	12.4%	31 December 2025

Interests are as stated in the sources below on the date shown. Ownership changes with deals, so a stake may have changed since the date shown.

How much does it produce?

Reported output of Tomago smelter
Period	Output	Basis	Where in the source
CY2025	574 '000 tonnes (kt) of primary aluminum, 100% basis ('Total' column)	100% of the smelter, as printed by Rio Tinto, a joint-venture holder	printed p.276 (PDF p.278), table 'Metals and minerals production', block 'ALUMINIUM (primary) (thousand tonnes)', row 'Tomago (Australia)', column '2025 Production, Total' · Rio Tinto
CY2024	587 '000 tonnes (kt) of primary aluminum, 100% basis ('Total' column)	100% of the smelter, as printed by Rio Tinto, a joint-venture holder	printed p.276 (PDF p.278), table 'Metals and minerals production', block 'ALUMINIUM (primary) (thousand tonnes)', row 'Tomago (Australia)', column '2024 Production, Total' · Rio Tinto

Between CY2024 and CY2025 the reported figure fell by 2.2%, in the same unit and on the same basis.

How the primary-aluminum figure is worked out. The source reports 574 thousand tonnes in the 'Total' column (whole smelter, Rio Tinto interest 51.6%) for 2025; the figure is reported by Rio Tinto as a joint-venture holder, not by the operator. Rio Tinto reports in thousand tonnes, so the figure converts to 574,000 tonnes. World smelter production of primary aluminum in 2025 was 74,000,000 tonnes (USGS Mineral Commodity Summaries 2026); Australia produced 1,500,000 tonnes.

Status: operating, as of 30 September 2026.

Rio Tinto's report also prints its own share of production for this smelter; that share is not used for the content figure, and the whole-smelter figure is never counted together with it.
Rio Tinto's table covers primary aluminum only; recycled production is reported on a separate line and is not included.

How does it compare?

Other aluminum operations on this site: Alma smelter, Alouette smelter, Bécancour smelter, Boyne Island smelter, Kitimat smelter, Tiwai Point smelter, Sohar smelter, Laterrière smelter, Grande-Baie smelter, ISAL smelter, Bell Bay smelter, Arvida smelter. In Australia: Boyne Island smelter, Bell Bay smelter. See where aluminum comes from for the country totals, the country page for Australia.

Sources

Rio Tinto: Annual Report 2025 (annual report (filed with the SEC on Form 6-K, 2026-02-19), CY2025, with 2024 and 2023 comparatives). Opened 4 November 2026; used: printed p.276 (PDF p.278), 'Metals and minerals production'; PDF p.160.
Norsk Hydro ASA: Integrated Annual Report 2025 (annual report, CY2025). Opened 4 November 2026; used: PDF pp.37, 146, 155, 168, 251, 302 (printed page equals PDF page).
Rio Tinto: Rio Tinto releases third quarter 2026 production results (third quarter operations review) (quarterly operations review (SEC Form 6-K exhibit, 2026-10-14), Q3 2026 and nine months to 30 September 2026). Opened 4 November 2026; used: printed pp.9, 28.
U.S. Geological Survey: Mineral Commodity Summaries 2026: Aluminum (government statistical summary, 2025 (world and country smelter production)). Opened 3 November 2026; used: world smelter production and capacity 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 primary aluminum 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.
What is compared. The figure is tonnes of primary aluminum metal produced by the whole smelter, compared with USGS smelter production of primary aluminum. Remelted and recycled metal is not primary production.
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 aluminum mine. Shares of a country's output mix periods and bases, so treat them as indicative.
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