MinRes Onslow Iron port: offshore loading design notes for project engineers
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Mineral Resources has begun full operations at its Onslow Iron port facilities at the Port of Ashburton, using purpose-built transhippers to move ore from a 220,000t enclosed storage facility to deep-water capesize vessels offshore. The system is designed for low-dust handling, with covered conveyors and a fully enclosed shiploader feeding 20,000t transhippers that shuttle to a 25m-deep anchorage. For port, civil and materials engineers, the project showcases large-scale, low-footprint iron ore export using off‑shore loading rather than traditional long trestle wharves.
Technical Brief
- Transhippers are owned and operated by MinRes, integrating marine logistics with mine-to-port supply chain control.
- The port solution is intended as a template for future stranded Pilbara deposits without deep-water berths.
Our Take
MinRes’ Onslow Iron port build-out in the Pilbara sits alongside its new Lamb Creek iron ore project (7.5 Mtpa, first ore targeted Q4 FY26), signalling a coordinated push to lock in both upstream tonnes and export capacity on the same coast.
Across our infrastructure coverage, MinRes appears more frequently than most ASX iron ore names, reflecting how its Pilbara strategy now spans mine development, haulage and port assets rather than relying solely on third-party export terminals.
With sustainability tagged in this piece and Origin Energy and POSCO appearing in recent MinRes-related items, the Port of Ashburton work is likely to be scrutinised for how it integrates lower-emission power and logistics into the broader Onslow Iron supply chain.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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