Brazil's Supreme Court Rewrites the Indigenous Mining Licence — With a 24-Month Fuse

What happened

On 13 August 2026, the full bench of Brazil's Supreme Federal Court (STF) confirmed — by majority vote — Writ of Injunction MI 7516, an interim order first granted by Justice Flávio Dino in February 2026 and arising from proceedings brought by Patjamaaj, the coordinating organisation of the Cinta Larga people of Rondônia and Mato Grosso. The court found that Brazil's National Congress had been in unconstitutional default for 37 years by failing to enact legislation required by Article 231, Paragraph 3 of the 1988 Federal Constitution, which expressly conditions mining on Indigenous lands on congressional authorisation, community consultation, and a legislated revenue share. The STF gave Congress 24 months — until August 2028 — to remedy that omission.

Pending legislation, the court established a provisional licensing framework applicable immediately to four named Cinta Larga territories. The interim rules cap any mining footprint at one percent of each territory, require prior consultation and approval by a community majority acting through an indigenous cooperative, mandate environmental-impact studies and National Mining Agency (ANM) and congressional authorisation for each project, and — critically for commercial operators — impose a 50% revenue-share obligation on any third-party concessionaire in place of the standard government royalty allocation. Non-indigenous illegal miners (garimpeiros) are ordered to vacate within 120 days. The court was explicit that the ruling is a temporary constitutional bridge, not a liberalisation of the general law.

Why it matters for dispute formation

The ruling creates at least three interlocking dispute vectors for existing and prospective concession holders. First, any ANM title that overlaps with or abuts a demarcated Indigenous territory in Brazil now sits beneath a new judicial consent layer. The STF's reasoning — that congressional inaction itself constitutes a constitutional violation — signals that courts, not just legislators, are prepared to fill the regulatory gap. That reasoning is not limited to Cinta Larga: it is a structural constitutional finding that could be extended by future writs to other Indigenous peoples and territories the moment analogous petitions are filed. Brazil's SIGMINE cadastre records active exploration applications across multiple Indigenous territories; each one is now a potential trigger for a writ of injunction structured on the same template as MI 7516.

Second, the 50% community revenue-share for third-party operators is a novel fiscal obligation that appears nowhere in existing ANM concession decrees or Mining Code royalty schedules. Concession holders who obtained titles before the ruling did so without pricing this liability into their project economics. Any attempt by operators to challenge or resist the obligation in ANM proceedings or in federal courts risks being cast as a constitutional violation rather than a straightforward administrative dispute — a significant shift in the litigation posture available to investors. Third, the 24-month congressional clock creates a race-to-legislate dynamic. If Congress fails to pass a law by August 2028, the STF may extend its provisional framework more broadly or harden its terms. If Congress does legislate — and the political dynamics around critical minerals, garimpeiro constituencies, and indigenous rights lobbies are intensely contested — the resulting statute will almost certainly alter royalty rates, consent thresholds, and area-use limits relative to current concession conditions. Any material adverse change in a concessionaire's economic position could seed a regulatory-taking argument, though Brazil has no BIT network that would readily support an investor-state claim, meaning commercial arbitration under contract or domestic administrative litigation is the more likely forum.

The ruling also has ESG and counterparty dimensions that matter to mining-company boards. Brazil is a critical-minerals supplier of global significance — exporting niobium, tantalum, tin, and copper concentrates at scale. Downstream offtakers, particularly those subject to EU Deforestation Regulation supply-chain due diligence or US Dodd-Frank 1502 conflict-minerals traceability obligations, will now need to map whether their Brazilian suppliers hold titles touching demarcated Indigenous territories. A failure to establish ILO Convention 169-compliant consent documentation in that supply chain could constitute a compliance event under those instruments. The STF ruling, by judicially establishing what adequate indigenous consultation must look like, simultaneously becomes the benchmark against which existing and future due-diligence certifications will be tested.

Who's exposed

What to watch

• Whether Patjamaaj or other Indigenous organisations file further Writs of Injunction before the STF extending the Cinta Larga consent architecture to other demarcated territories — the template is now judicially approved.
• Congressional progress on the Indigenous Lands Mining Bill (PL 191/2020 and successor bills): the 24-month clock expires August 2028, but interim committee votes in late 2026 will signal whether a compromise text is achievable before mid-term elections in 2026.
• ANM enforcement of the 120-day garimpeiro removal order: compliance in Rondônia will test whether the provisional framework has operational teeth and will determine whether concession holders face competing on-the-ground actors during their own permitting processes.
• Whether any existing cassiterite or columbite-tantalite concession holder in the named Cinta Larga territories initiates administrative review proceedings before the ANM or federal courts challenging the 50% revenue-share as an uncompensated change to vested permit conditions.