Rio Tinto Takes 53.9% Stake in Nemaska Lithium, Commits $300m in 2026
Rio Tinto has increased its stake in Nemaska Lithium to 53.9% while the Québec government holds 46.1%, granting operational control to Rio Tinto. Construction at the Bécancour lithium hydroxide plant is 60% complete, with Rio Tinto investing over $300m in 2026 and Québec up to C$274m.
1. Majority Acquisition
Rio Tinto now holds a 53.9% stake in Nemaska Lithium while the Government of Québec retains 46.1% following equity investments since March 2025. This majority position gives Rio Tinto operational control and aligns Nemaska with its integrated lithium growth strategy.
2. Bécancour Plant Progress
The lithium hydroxide plant in Bécancour reached 60% construction completion by end-2025, with all engineering work finished. Commissioning activities will begin in 2026 and initial commercial production is targeted for 2028.
3. Funding Commitments
Investissement Québec is set to contribute up to C$274.16m through equity subscriptions, while Rio Tinto will invest more than $300m in 2026 to advance plant construction and operational readiness. Both partners will continue to fund ongoing development.
4. Supply Strategy
Rio Tinto is evaluating its Whabouchi spodumene mine and the wholly owned Galaxy mine to determine the optimal supply mix for the Bécancour plant. This assessment is scheduled to conclude in the first half of 2026 to secure feedstock for future production.