Onslow Iron: an iron ore operation in Australia
Onslow Iron is an integrated mine and processing complex producing iron ore in Ashburton coast near Onslow, Western Australia (private haul road to the Port of Ashburton, transhipment), Australia. The sources report 33,860 thousand tonnes (k wmt), produced, wet metric tonnes for FY2026 (Jul 2025 to Jun 2026); the basis is 100% of the operation, as reported by MinRes. Measured as usable ore, whole-operation output for FY2026 (Jul 2025 to Jun 2026) is 33,860,000 tonnes: about 1.3% of world iron ore output in 2025 and about 3.5% of Australia's; it is one of 21 operations on this site whose output can be stated in usable ore.
Who owns and operates it?
| Owner | Interest | As of |
|---|---|---|
| MinRes | — | 30 June 2026 |
How much does it produce?
| Period | Output | Basis | Where in the source |
|---|---|---|---|
| FY2026 (Jul 2025 to Jun 2026) | 33,860 thousand tonnes (k wmt), produced, wet metric tonnes | 100% of the operation, as reported by MinRes | PDF p.4 (P4), Onslow Iron table, row 'Produced (100%)', FY26 column; Fe grade row, same table · Mineral Resources Limited |
| FY2026 (Jul 2025 to Jun 2026) | 34,136 thousand tonnes (k wmt), shipped, wet metric tonnes | 100% of the operation, as reported by MinRes | PDF p.4 (P4), same table, row 'Shipped (100%)', FY26 column · Mineral Resources Limited |
| FY2025 (Jul 2024 to Jun 2025) | 15,931 thousand tonnes (k wmt), produced, wet metric tonnes | 100% of the operation, as reported by MinRes | PDF p.4 (P4), same table, row 'Produced (100%)', FY25 column · Mineral Resources Limited |
How the usable-ore figure is worked out. MinRes prints 33,860 thousand wet metric tonnes produced at Onslow Iron in FY2026 on a 100% basis. Its attributable shipments of 19,650 thousand tonnes are not used. World mine production of usable ore in 2025 was 2,600,000,000 tonnes (USGS Mineral Commodity Summaries 2026); Australia produced 980,000,000 tonnes.
The period (FY2026 (Jul 2025 to Jun 2026)) is not the calendar year of the USGS totals (2025), so the shares are approximate.
Status: operating, as of 30 June 2026.
- MinRes prints most Onslow Iron lines on an attributable basis and marks the 100% lines separately; shipments were 34.1 Mt on a 100% basis against 19.7 Mt attributable in FY2026.
- FY2025 production on the same 100% basis was 15,931 thousand tonnes.
How does it compare?
Other iron ore operations on this site: Hamersley mines (Rio Tinto Pilbara), Hope Downs (Rio Tinto and Hancock Prospecting), Robe River - Robe Valley, Robe River - West Angelas, Iron Ore Company of Canada (IOC), Simandou Blocks 3 and 4 (SimFer), Western Australia Iron Ore (WAIO), Fortescue Pilbara hematite operations, Iron Bridge (magnetite), Serra Sul (S11D), Carajas, Serra Norte, Carajas, Itabira complex. In Australia: Hamersley mines (Rio Tinto Pilbara), Hope Downs (Rio Tinto and Hancock Prospecting), Robe River - Robe Valley, Robe River - West Angelas, Western Australia Iron Ore (WAIO), Fortescue Pilbara hematite operations, Iron Bridge (magnetite). See where iron ore comes from for the country totals, the country page for Australia.
Sources
- Mineral Resources Limited: Quarterly Activity Report, April to June 2026 (Q4 FY26) (quarterly activity report (ASX announcement, 29 July 2026), Q4 FY2026 and FY2026 (Jul 2025 to Jun 2026)). Opened 4 November 2026; used: PDF pp.1, 4, 9.
- U.S. Geological Survey: Mineral Commodity Summaries 2026: Iron Ore (government statistical summary, 2025 (world and country mine production of usable ore)). Opened 3 November 2026; used: world and country mine production table, usable ore.
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 usable ore 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. Operators print tonnes of ore: saleable production for most, run-of-mine and pelletizing feed for Vale, and shipments for Fortescue and Onslow Iron, mostly as wet tonnes. The figure is compared with the USGS usable-ore total, which does not state a moisture basis, so the share is indicative.
- 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 iron ore 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.