Rio Tinto Chosen as Codelco Lithium Partner in Chile's Maricunga

Codelco

Chilean state miner Codelco has selected Rio Tinto as its strategic partner to develop lithium in the high-grade Salar de Maricunga basin. The newly announced joint venture marks a significant milestone for Chile’s lithium roadmap, positioning the Rio Tinto Codelco lithium partnership as a key force in one of the world’s richest brine regions. The agreement grants Rio Tinto a 49.99% stake, with Codelco holding 50.01% and leading the development.

$350 Million Investment Sets Stage for DLE Breakthrough

Under the terms of the deal, Codelco will contribute mining rights and fund feasibility studies, while Rio Tinto will initially invest $350 million in further resource analysis. If the project advances, the Australian miner has committed another $500 million to construct a direct lithium extraction (DLE) plant by the decade’s end. An additional $50 million will be invested if lithium is commercially shipped before 31 December 2030. The Rio Tinto Codelco lithium partnership aims to commercialize Maricunga as Chile’s second lithium-producing salt flat after Salar de Atacama, where Codelco also now holds licenses.

Chile Reinforces Public-Private Lithium Model

This partnership aligns with Chile’s national lithium strategy, which mandates Special Lithium Operating Contracts (CEOLs) under public-private frameworks. Since 2023, all lithium reserves are state-owned, and any development requires government participation and profit-sharing. The Rio Tinto-Codelco project represents one of three concessions awarded recently, following community approval from nearby indigenous groups. The Rio Tinto Codelco lithium partnership also signals growing trust in DLE technology and a potential shift in how Latin American lithium assets are developed.

The Metalnomist Commentary

The Rio Tinto-Codelco lithium alliance reflects a global trend: pairing major miners with national resource holders in strategic battery material projects. With political backing, high-grade resources, and DLE innovation, Maricunga could become South America's next lithium flagship.