Rio Tinto–WA A$1.1bn desalination JV: water security lens for Pilbara mines
Reviewed by Tom Sullivan
First reported on International Mining – News
30 Second Briefing
Rio Tinto and the Western Australian Government have formed a 50:50 joint venture to deliver the A$1.1 billion Dampier Seawater Desalination Plant, comprising Stage 1 and Stage 2. When fully operational, the plant will supply 8 GL/y of desalinated water into the West Pilbara Water Supply Scheme, easing demand on stressed regional aquifers that currently support mining and communities. For mine planners and water engineers, the scheme signals a shift towards coastal desalination as a primary source for Pilbara process and potable water security.
Technical Brief
- Reduced abstraction from stressed regional aquifers will alter long-term hydrogeological drawdown and recharge behaviour.
- The joint venture model provides a template for co-funded desalination in other resource-dependent regions.
Our Take
A 50:50 JV structure between Rio Tinto and the Western Australian Government on the Dampier Seawater Desalination Plant signals an unusual degree of public-sector risk sharing for a mine-adjacent A$1.1 billion water asset, which could set a template for future Pilbara infrastructure where social licence and long-life water security intersect.
Adding 8 GL per year into the West Pilbara Water Supply Scheme gives Rio Tinto more headroom to decouple iron ore production growth from groundwater abstraction limits, which have been a binding constraint for several operators in Western Australia in our Infrastructure coverage.
Within the 726 Infrastructure stories and 2042 tag-matched pieces in our database, very few large-scale desalination projects in Australia feature such a clear sustainability framing, suggesting Rio Tinto is positioning this asset as both a production enabler and a visible decarbonisation and climate-resilience measure for its Pilbara operations.
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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