Nemaska pause and Rio Tinto’s Quebec lithium plans: project economics lens for engineers
Reviewed by Joe Ashwell
First reported on MINING.com
30 Second Briefing
Construction of Rio Tinto’s Nemaska lithium hydroxide plant at Bécancour, Quebec, more than 70% complete and backed by about C$1.2 billion in public funding, is now expected to remain paused through 2027, casting doubt on the previously committed 2028 start-up. The halt coincides with 68 layoffs and a sharp drop in Asian lithium carbonate spot prices to $12.90/kg from over $25/kg in May, pressuring project economics. Rio is still reviewing long-term spodumene feed from Nemaska’s Whabouchi deposit versus its wholly owned Galaxy project, with no decision yet.
Technical Brief
- Long‑term feed review compares Nemaska’s Whabouchi deposit with Rio’s wholly owned Galaxy project, with no selection yet.
- For other lithium conversion projects, similar price shocks can rapidly strand partially built downstream assets and public capital.
Our Take
Rio Tinto’s pause at the Bécancour lithium plant contrasts with its concurrent capital allocation into US copper, such as the $144 million Resolution Copper phase in Arizona, signalling that near-term spend is being prioritised towards brownfield or late-stage copper over early-stage lithium chemicals in Quebec.
With lithium carbonate spot prices in Asia having more than halved from above $25/kg to $12.9/kg, the economics of a Quebec-based lithium hydroxide chain look materially tighter, which likely raises the hurdle rate for further Rio and Investissement Québec equity beyond the roughly $500 million already earmarked for the province’s lithium business.
Our database shows lithium and lithium carbonate appear across 100 keyword-matched pieces, but relatively few involve Canada or Quebec, so Nemaska’s extended construction pause removes one of the more advanced North American conversion projects from the near-term supply pipeline just as US projects like Hudbay’s Copper World in Arizona continue to move through permitting and study phases.
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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