By Charles Pitts
SANTIAGO : Chile’s state-owned copper giant Codelco has officially revised the development timeline for its flagship Maricunga lithium project, pushing the expected start of production to 2034. The update represents a four-year delay from the previous 2030 target, reflecting the logistical and regulatory complexities of bringing new brine operations online under Chile’s National Lithium Strategy.
Despite the shift in timeline, Rio Tinto has reaffirmed its commitment to the venture. The global mining major remains a strategic partner, holding a 49.99% stake in the subsidiary Salar de Maricunga SpA. Rio Tinto’s involvement includes a substantial funding package of up to $900 million, designed to carry the project through its final feasibility stages and into construction.
The delay comes as the lithium industry grapples with a volatile pricing environment and a heightened focus on environmental and social governance (ESG) standards. While the 2034 target moves the project further into the next decade, the partnership between the world’s largest copper producer and one of its most diversified miners underscores the long-term strategic value of the Maricunga asset.
Regulatory Hurdles and Permitting Cycles
The postponement to 2034 is primarily attributed to the prolonged permitting and environmental approval cycles required for high-altitude brine projects. Codelco’s chairman recently informed the Chilean Senate that while the project remains a cornerstone of the country’s lithium ambitions, the path to commercial production requires navigating a complex web of regulatory requirements.
Specifically, the project must align with the “Special Lithium Operating Contract” (CEOL) framework, which has undergone recent revisions by the Chilean Ministry of Mining to address observations from the Comptroller’s Office. These administrative adjustments are essential to ensure the project meets the legal and environmental standards set forth by the current administration’s state-led lithium model.
Furthermore, the joint venture transaction itself is still awaiting final regulatory clearances. While approvals have been secured from authorities in Brazil, South Korea, and Poland, the deal still requires the green light from regulators in Chile and China. These final hurdles are expected to be cleared by the end of the first quarter of 2026.
Rio Tinto’s Financial Commitment and Strategic Entry
Rio Tinto’s entry into the Chilean lithium sector via Maricunga marks a significant pivot for the company as it seeks to expand its battery metals portfolio. The financial structure of the partnership is designed to de-risk the project for Codelco while providing Rio Tinto with a significant foothold in one of the world’s most concentrated lithium deposits.
The funding commitment is broken down into several key stages:
- Pre-FID Funding: Rio Tinto has committed $350 million to fund advanced technical studies, resource definition, and environmental impact assessments leading up to a Final Investment Decision (FID).
- Construction Capital: Following a positive FID, an additional $500 million will be contributed toward initial construction costs.
- Performance Incentives: A $50 million performance-linked payment was originally contingent on reaching production by 2030. While the new 2034 target makes this milestone unlikely, the overall capital envelope remains intact to support the revised schedule.
By securing a 49.99% stake, Rio Tinto gains access to what is often cited as the world’s second-largest lithium concentration after the Salar de Atacama. For Codelco, the partnership provides not only capital but also Rio Tinto’s technical expertise in large-scale project management and processing technology.
Market Context: 2026 vs. Long-Term Supply
The delay of the Maricunga project has minimal impact on the immediate lithium price forecast for 2026, as the project was never slated to contribute to the global supply balance during this decade. Market participants and analysts currently focused on the 2026 recovery view the Maricunga news as a long-term signal rather than a near-term disruption.
However, for the early-to-mid 2030s, the four-year slippage tightens the projected supply of high-quality lithium carbonate. Chile’s role as a reliable supplier is being scrutinized as the state transitions toward its new lithium policy, which requires state control in “strategic” salars like Maricunga.
The following table outlines the updated milestones for the Maricunga project as of mid-2026:
| Milestone | Original Target | Revised Target (2026 Guidance) | Status |
|---|---|---|---|
| JV Transaction Closing | Q4 2025 | Q1 2026 | Pending Regulatory Approval |
| Completion of Feasibility Studies | 2026 | 2028 | Ongoing |
| Final Investment Decision (FID) | 2027 | 2029 | Planned |
| Commencement of Construction | 2027 | 2030 | Planned |
| First Lithium Production | 2030 | 2034 | Updated Guidance |
Technical Challenges and Extraction Methods
Beyond the regulatory landscape, the Maricunga project faces the inherent technical challenges of operating at high altitudes in the Andes. The brine chemistry at Maricunga, while rich in lithium, also contains significant levels of impurities that require sophisticated processing techniques to reach battery-grade specifications.
Codelco and Rio Tinto are reportedly evaluating both traditional evaporation pond methods and Direct Lithium Extraction (DLE) technologies. While evaporation ponds are the industry standard in Chile, the National Lithium Strategy encourages the adoption of DLE to minimize water consumption and reduce the environmental footprint of mining operations. The decision on which technology to prioritize will be a critical component of the upcoming feasibility studies funded by Rio Tinto.
Impact on Chile’s National Lithium Strategy
The delay at Maricunga serves as a reality check for the pace of Chile’s state-led lithium expansion. While the government of President Gabriel Boric has moved quickly to establish a framework for state-private partnerships, the transition from policy to production is proving to be a multi-year endeavor.
Codelco, which is already managing a massive $40 billion overhaul of its aging copper mines, faces a steep learning curve in the lithium sector. The company is concurrently managing its relationship with SQM in the Salar de Atacama, where a similar state-controlled joint venture was recently finalized. The worsening copper supply outlook and operational pressures at its core copper assets mean that Codelco’s lithium ambitions must be balanced against its primary mandate to maintain its position as the world’s top copper producer.
Industry Outlook and Investor Sentiment
Industry analysts suggest that the Maricunga delay may reflect a broader trend in the mining sector where major projects are being de-risked through extended timelines. By pushing production to 2034, the partners may be positioning the project to hit the market during a period of more stable, long-term demand growth driven by the maturity of the global electric vehicle (EV) market.
For investors, the continued partnership with Rio Tinto is the most significant takeaway. The willingness of a Tier-1 miner to commit nearly $1 billion to a project that is still nearly a decade away from production signals a deep-seated belief in the structural deficit of the lithium market in the 2030s.
As the transaction closes in early 2026, the focus will shift to the technical results of the expanded drilling and study programs. The market will be watching closely for any further shifts in the timeline or updates on the chosen extraction technology, both of which will dictate Maricunga’s eventual impact on the global energy transition.
