Collahuasi permit setback: desalination and water-supply risks for mine planners
Reviewed by Joe Ashwell
First reported on MINING.com
30 Second Briefing
A Chilean environmental court has annulled the permit for Collahuasi’s $3.2 billion desalination plant, forcing a reassessment of the seawater system that pumps desalinated water nearly 200 km from the Pacific coast to the 4,600‑metre‑elevation mine, which produced over 404,000 tonnes of copper in 2025. The decision affects an expansion intended to add 20 years of mine life and cut reliance on continental water, even though contractor Techint completed the pumping system in April. Industry leaders, including Chilean Mining Chamber president Manuel Viera, cite the case as evidence of a “cursed” regime where a single project can need 500+ permits, raising schedule and cost risk for large‑scale desalination and water‑supply infrastructure.
Technical Brief
- Second Environmental Court annulled the desalination plant’s RCA, specifically over marine and Indigenous impacts.
- SEA must now partially reopen the environmental assessment, delaying final configuration of the seawater system.
- Collahuasi ownership split: Anglo American, Glencore and a Mitsui‑led Japanese consortium.
- Anglo and Glencore both issued aligned statements, signalling coordinated legal and regulatory strategy.
- Tribunal decision arrives after years of prior environmental review and Indigenous consultation already undertaken.
- Manuel Viera reports individual Chilean mining projects often needing 500+ separate permits pre‑construction.
- Desalination and long‑distance water conveyance remain politically sensitive in the Atacama due to energy demand and marine footprint.
Our Take
In our database of 1209 Mining stories, Chilean copper items like Collahuasi stand out for the sheer permitting burden, with references to more than 500 permits per project signalling materially longer lead times than most Latin American copper jurisdictions we track.
Anglo American’s parallel portfolio reshaping in coal, seen in the planned divestments of its Queensland steelmaking coal assets, heightens the strategic importance of long-life copper options such as Collahuasi for its future cash-flow mix.
The 200 km desalinated seawater system tied to the Collahuasi expansion aligns with other Atacama copper operations moving off freshwater, which typically improves social licence but also locks in higher power demand and exposure to Chile’s grid and transmission constraints.
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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