Rio Tinto’s US$1.4bn Argentina lithium projects: design and works outlook for engineers
Reviewed by Joe Ashwell
First reported on International Mining – News
30 Second Briefing
Rio Tinto has officially opened its Fénix 1B brine expansion and the new Sal de Vida lithium operation in Catamarca, Argentina, following a combined investment of about US$1.4 billion attended by President Javier Milei and Governor Raúl Jalil. The projects add significant lithium brine capacity in the Hombre Muerto basin, a high-grade salar already hosting established operations, strengthening Argentina’s role in global battery raw material supply. For geotechnical and civil contractors, the twin developments signal sustained demand for high-altitude infrastructure, tailings and brine pond construction in the Puna region.
Technical Brief
- Brine extraction and pond systems will demand lined impoundments, seepage control and geotechnical stability checks on dykes.
- Civil works likely include long access roads, power distribution and camp facilities over weak, saline soils.
- Contractors can expect sustained demand for earthworks, pond construction and foundation improvement in similar salars.
Our Take
Rio Tinto’s $1.4 billion lithium build-out in Catamarca sits alongside recent multi‑billion‑dollar commitments such as the Kangwinan bauxite project in Queensland, signalling that lithium is being scaled as a core pillar rather than a niche in its growth portfolio.
Within our 101 lithium‑tagged pieces, most activity has centred on Australia and North America, so a large greenfield push in Argentina suggests operators now see the country’s regulatory and fiscal risk as acceptable for tier‑one battery‑metal investment.
For contractors and service providers, the combination of new lithium projects in Argentina and Rio Tinto’s ongoing technology roll‑outs (such as the battery‑electric haul truck trial with BHP at Jimblebar) points to future tenders favouring suppliers that can support both brine/evaporation chemistry and electrified mine fleets.
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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