Mechanism
The 2022 lithium nationalisation was enacted via Decree published in the Diario Oficial de la Federación on 20 April 2022, amending the Ley Minera (Mining Law) and creating Litio para México (LitioMx), a decentralised federal public body attached to the Secretaría de Energía (SENER). The reform added Articles 5 bis and 10 (bis) to the Mining Law, reserving to the Mexican State the exclusive right to explore, exploit, benefit, process, and commercialise lithium in all its forms; private concessions for lithium were simultaneously prohibited and all pending concession applications for lithium-bearing deposits cancelled.
A Senate minority (opposition senators representing roughly 33 % of the chamber) filed Acción de Inconstitucionalidad 78/2022 before the SCJN arguing: 1. No prior, free, and informed consultation with indigenous communities was conducted before enacting the reform, in breach of ILO Convention 169 and Article 2 of the Mexican Constitution. 2. Congress exceeded its legislative powers by reserving lithium via secondary legislation rather than through a prior constitutional amendment (the constitutional article on strategic areas was later amended in October 2024 to list lithium explicitly, but the secondary law preceded that change).
The SCJN Pleno ruled unanimously on 24 March 2026:
- The prior-consultation obligation was not triggered because the reform represented "a general change in the legal regime of lithium" rather than a targeted harm to specific indigenous communities.
- The prior constitutional framework (Article 27 on national patrimony) already granted Congress sufficient power to reserve additional minerals for the State; no constitutional amendment was prerequisite.
- The October 2024 constitutional reform (which explicitly listed lithium as a strategic federal area) had by the time of the ruling consolidated the legal basis, further mooting the second argument.
Downstream implications
- Investment prohibition confirmed. All private lithium mining, exploration, and processing in Mexico is constitutionally barred with no realistic near-term reversal pathway. The ruling removes the last viable legal avenue for foreign miners or JV proponents.
- Pending concession applications voided. An estimated ~11 million tonnes of lithium resources (principally lithium-bearing clays in Sonora and brines in Baja California Norte/Sur and San Luis Potosí) previously covered by pre-2022 concession applications are effectively stranded. Notably, Bacanora Lithium's Sonora lithium clay project (~2.1 Mt LCE) was already in limbo following the nationalisation; this ruling confirms no re-entry path under current law.
- LitioMx capacity gap. LitioMx was created with modest initial capitalisation and limited geological survey capacity; the 2023–2025 budget cycle allocated far less than what would be required to operationalise national exploration. The state monopoly now has judicial permanence without the industrial capacity to deploy it at scale, creating a legal lock-in of under-utilisation.
- Global lithium supply-chain exclusion. Mexico is not currently a top-tier lithium producer (no commercial mine in operation), but the confirmed resource base (~1.7 % of global identified resources per USGS 2024 Mineral Commodity Summaries) is now structurally off-limits to private capital that would be needed to develop it. This broadens the producing-country concentration risk in the lithium triangle (Chile, Argentina, Bolivia).
- Structural parallel: Panama copper ruling. The SCJN ruling mirrors the November 2023 Panamanian Supreme Court decision striking down the Minera Panamá copper concession (filed 2023-11-27), but with the opposite outcome: Panama annulled a private concession; Mexico confirmed a state-monopoly. Both establish high-court barriers to private mineral access in Latin America.
Open questions
- When does LitioMx publish its first national lithium exploration roadmap? No timeline has been announced since the ruling.
- Will the October 2024 constitutional amendment (now confirmed as the definitive legal basis) prompt LitioMx to seek new international state-to-state partnerships (analogous to Chile-CODELCO or Bolivia-CITIC)?
- Does the ruling's indigenous-consultation reasoning survive challenge at the Inter-American Court of Human Rights or the UN CERD? Several indigenous-rights groups in Sonora (Yaqui Nation; Comcáac/Seri) have signalled they may pursue inter-American remedies.