Cadence Minerals Initiates ICSID Arbitration Against Mexico Over Sonora Lithium Project
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TL;DR
- Cadence Minerals and REM Mexico Limited filed an ICSID arbitration against Mexico.
- The case concerns the cancellation of nine lithium concessions in Sonora after the 2022 nationalization.
- Claims are based on alleged expropriation under the UK-Mexico bilateral investment treaty.
- This is the third ICSID arbitration over the Sonora Lithium project.
Overview
Cadence Minerals, a UK-based company, and its subsidiary REM Mexico Limited have initiated arbitration proceedings against the Mexican government at ICSID. The arbitration relates to the cancellation of nine lithium mining concessions for the Sonora Lithium project following Mexico's 2022 decision to nationalize lithium assets. Cadence alleges expropriatory conduct contrary to the 2006 UK-Mexico investment protection agreement.
What Happened
On 24 July 2026, Cadence Minerals and REM Mexico Limited filed a request for arbitration with ICSID concerning the revocation of their lithium concessions in Sonora, Mexico.
The companies allege that Mexico's 2022 lithium nationalization and subsequent cancellation of the mining rights amount to an expropriation in breach of the bilateral investment treaty between the UK and Mexico.
Details regarding the claimed damages have not been disclosed.
Cadence held a 30% stake in the Sonora Lithium project, while the Chinese company Ganfeng International Trading held the remaining 70%.
This filing marks the third ICSID arbitration related to the Sonora Lithium project; Ganfeng filed a separate claim in June 2024, and the Orr-Ewing family initiated another in June 2025, each asserting rights linked to the project.
Context
In April 2022, the Mexican government amended the Mining Law to declare lithium a strategic mineral and to reserve its exploration and exploitation to the state via the newly formed agency Litio para México (LitioMX).
Following the nationalization, several foreign stakeholders in the Sonora Lithium project, including Cadence, Ganfeng, and the Orr-Ewing family, have initiated international investment arbitration claims under relevant treaties.
LitioMX reportedly has limited operational capacity, with few employees and no active lithium development projects.
Why It Matters
- The dispute highlights legal risks for foreign investors in Mexico's natural resources sector following legislative changes.
- Multiple ICSID arbitrations over the same asset underscore potential financial exposure for Mexico and may affect future inward investment.
- The outcomes could influence future state policy and investor-state dispute settlement practices in the mining sector.