BHP wins UK Court of Appeal ruling to end contempt proceedings tied to Brazil’s 2015 Mariana dam disaster

BHP Group (ASX: BHP), the world’s largest diversified miner by market capitalisation, secured a significant procedural victory on 16 March 2026 when the UK Court of Appeal overturned a lower court ruling and brought criminal contempt proceedings against the company to an end. The contempt case centred on allegations that BHP had covertly funded Brazilian mining lobby group Ibram to file a constitutional challenge at Brazil’s Supreme Court, with the stated aim of blocking dozens of Brazilian municipalities from suing BHP in London over the catastrophic 2015 collapse of the Fundao tailings dam in Mariana, Minas Gerais. The development arrives at a legally complex moment for BHP: the company has simultaneously sought permission to appeal a November 2025 High Court ruling that found it liable under Brazilian environmental law for the dam disaster, with a damages trial currently scheduled for October 2026. BHP shares on the ASX were trading at approximately A$52.81, having pulled back sharply from a 52-week high of A$59.39 reached in early March 2026, within a 52-week range of A$33.25 to A$59.39.

What did the UK Court of Appeal actually decide in the BHP contempt case and why does it matter for the broader Mariana litigation?

The contempt proceedings were initiated by lawyers representing municipal claimants who alleged that BHP had interfered with the administration of justice in the English courts by procuring and funding Ibram’s constitutional challenge in Brazil. The allegation was specific and serious: claimants argued that BHP had secretly arranged for Ibram to file a petition with Brazil’s Supreme Court that, if successful, would have forced 31 affected municipalities to abandon their London claims and pursue remedies exclusively through domestic Brazilian channels. The High Court had previously declined to strike out the contempt application in June 2025, with Mr Justice Constable finding there were reasonable grounds to proceed. The Court of Appeal reversed that decision on 16 March 2026, concluding that the contempt proceedings could not stand, and BHP welcomed the ruling. Lawyers for the claimants, represented by Pogust Goodhead, said their focus remains firmly on the underlying litigation over the dam collapse itself. The contempt thread was always secondary to the main liability and damages proceedings, but its resolution removes one layer of legal complexity from a case that has already consumed years of court time across two continents.

How did the Ibram constitutional challenge become central to allegations of deliberate interference with English court proceedings?

The Ibram affair surfaced from what claimants’ lawyers described as partial disclosures by BHP about the true scope of its financial obligations to the Brazilian mining association. According to court filings, BHP initially denied any meaningful involvement in the Ibram claim, but publicly available minutes from Ibram meetings revealed that BHP had directly requested the lobby group to bring the constitutional challenge. BHP subsequently admitted it had instigated the claim and agreed to fund it. Matters escalated further when Pogust Goodhead alleged that BHP Brasil’s involvement extended well beyond a capped sponsorship agreement of BRL 6 million, with an alleged oral agreement to cover all costs incurred by Ibram in the proceedings without limit. Mr Justice Constable had remarked in his June 2025 judgment that it was not obvious what practical purpose the capped sponsorship agreement served if it was effectively overridden by an unlimited oral commitment. BHP gave undertakings to the English court not to further assist Ibram in seeking the relief that formed the basis of the constitutional challenge. The Court of Appeal’s decision to terminate the contempt proceedings does not adjudicate on the merits of those underlying allegations, but it does bring the separate contempt track to a close.

What is the current status of BHP’s liability ruling and its bid to appeal the landmark November 2025 High Court judgment?

The contempt ruling lands while BHP is navigating an arguably more consequential legal question: whether it can appeal the November 2025 High Court judgment in which Justice Finola O’Farrell found BHP liable under Brazilian environmental law for the Fundao dam failure. That ruling was the culmination of a trial that began in October 2024 and concluded in March 2025, and it represented the first time any company had been held legally accountable in a court of law for Brazil’s worst ever environmental disaster. The court determined that BHP met the definition of an indirect polluter under Brazilian law, that the risk of dam collapse was foreseeable, and that BHP caused Samarco to continue raising the dam’s height despite clear and documented structural warnings. BHP announced it would seek permission to appeal that ruling, and the Court of Appeal is expected to deliver its decision on that application in the coming weeks. If permission is refused, the case proceeds directly to the October 2026 damages trial. If permission is granted, BHP may succeed in deferring what could be the most expensive liability determination in English legal history. The claimants’ lawyers have valued the claim at up to GBP 36 billion, though the eventual damages figure will be determined through trial rather than assertion.

How large is the claimant group and what has BHP already paid through Brazilian remediation schemes since the 2015 disaster?

The scale of the litigation reflects the scale of the disaster. The Fundao dam failed on 5 November 2015, releasing more than 40 million cubic metres of toxic mining waste into the Doce River and its tributaries, killing 19 people, displacing thousands, destroying ecosystems across hundreds of kilometres, and contaminating one of Brazil’s most important river systems for years. The UK group action includes more than 600,000 individual claimants, 46 local governments, and around 2,000 businesses. Thirty-one municipalities form a distinct subgroup within the litigation, and their standing to bring claims in England has now been confirmed by the High Court, which also ruled that BHP’s jurisdictional challenge based on Brazilian settlement waivers signed by individual claimants could not eliminate the broader group action. BHP has pointed consistently to the remediation and compensation efforts undertaken through its Brazilian arm, Vale, and the Samarco joint venture since 2015. According to BHP, those efforts have collectively provided approximately USD 13.4 billion for reparation and compensation to affected individuals and public authorities in Brazil, with financial aid reaching more than 610,000 people. BHP’s position is that the UK proceedings are duplicative of those existing frameworks, an argument the High Court rejected when determining that English jurisdiction was appropriate and that the case could proceed.

What are the strategic and financial implications for BHP if the liability ruling survives appeal and the damages trial proceeds in October 2026?

The financial exposure attached to the UK group action is, by any measure, extraordinary. A damages award in the range suggested by claimants’ lawyers would exceed the current market capitalisation of most mid-tier mining companies and represent a material share of BHP’s own balance sheet. The litigation therefore sits in a different category from most corporate legal proceedings: it is not a tail risk that can be reserved and managed quietly, but a potential event that institutional investors are actively pricing into their longer-term assessments of BHP’s liabilities. BHP’s balance sheet is robust by mining industry standards, with strong free cash flow generation from its iron ore and copper operations, a dividend yield of approximately 4.8% on the ASX, and a debt-to-equity ratio of around 0.63. The company’s next scheduled earnings release is April 2026, and investors will be watching for any updates on legal provisioning or settlement discussions. The broader litigation timeline, if the appeal is denied and the case proceeds through the October 2026 damages trial, a potential third stage for individual damages, and possible further appeals, extends realistically into 2028 or 2029 before any final payment obligations crystallise. That extended timeline gives BHP financial planning room but keeps the uncertainty alive across multiple fiscal years.

How does the BHP Mariana case fit into the broader trend of multinational companies facing liability in home-country courts for overseas environmental harm?

The Mariana litigation has become a reference point in the developing field of transnational corporate accountability. The High Court’s November 2025 finding that English courts have jurisdiction and that a UK-headquartered parent company can be held liable under foreign law for environmental damage caused by an overseas joint venture represents a meaningful expansion of the legal doctrine governing parent company responsibility. Legal practitioners in corporate governance and ESG have already begun examining how the judgment changes the risk calculus for multinational companies with complex subsidiary and joint venture structures in jurisdictions with historically limited enforcement capacity. The ruling suggests that operating through a joint venture rather than a wholly-owned subsidiary does not automatically insulate a parent from liability if it exercised meaningful oversight or direction over the subsidiary’s operations. BHP’s decision to raise the Fundao dam’s height despite documented structural concerns was, in the court’s assessment, inconceivable given the warnings available to management. For mining companies with tailings dam exposure globally, and there are hundreds of facilities worldwide carrying legacy operational risk, the Mariana case sets a precedent that goes well beyond its immediate financial stakes. A sustained settlement or damages award in this case will invite parallel action against other companies with comparable risk profiles.

How are BHP shares performing against the legal backdrop and what are analysts watching ahead of the April 2026 earnings release?

BHP shares on the ASX have had a volatile start to 2026. After touching an all-time high of A$59.39 on 3 March 2026, BHP shares pulled back sharply, trading at approximately A$52.81 by mid-March, a decline of roughly 11% from that peak in under two weeks. The pullback reflects a confluence of pressures that have little to do with the legal proceedings: China’s state-run iron ore buyer expanded restrictions on BHP iron ore purchases in early March, citing contract disputes, and the broader ASX materials sector has faced headwinds from iron ore price softness and global risk-off sentiment. The 52-week range of A$33.25 to A$59.39 illustrates how substantially BHP’s valuation has recovered over the past year, up more than 26% on a twelve-month basis even after the recent correction. Analysts tracking BHP ahead of the April 2026 earnings release are focused on the resolution of the China supply contract dispute, the trajectory of copper prices, capital expenditure updates on the Jansen potash project now budgeted at USD 8.4 billion, and any guidance on legal provisioning. The legal proceedings, while headline-generating, are not the dominant near-term driver of BHP’s share price, which remains primarily correlated to commodity cycles and Chinese demand signals.

Key takeaways: what the BHP contempt ruling means for the company, its legal strategy, and the mining industry

• The UK Court of Appeal on 16 March 2026 ended the criminal contempt proceedings against BHP that were tied to allegations it funded Ibram’s constitutional challenge in Brazil to block municipal claimants from suing in London, delivering a significant procedural win for the company.
• The contempt ruling does not affect the underlying liability finding. The November 2025 High Court judgment finding BHP liable for the Fundao dam collapse under Brazilian environmental law remains in force and is the subject of a separate, pending appeal application.
• BHP is simultaneously seeking permission to appeal the liability ruling, with the Court of Appeal expected to rule on that application in the coming weeks. If denied, the damages trial scheduled for October 2026 will proceed as planned.
• The damages trial, if it proceeds, will determine quantum in a case claimants’ lawyers value at up to GBP 36 billion. BHP’s final payment obligations, through possible further appeals and a potential third-stage individual damages trial, are unlikely to crystallise before 2028 or 2029.
• The claimant group in the UK action is exceptionally large: more than 600,000 individuals, 46 local governments, and around 2,000 businesses, with 31 municipalities forming a distinct subgroup whose standing to sue in England has been confirmed by the High Court.
• BHP has cited USD 13.4 billion in combined remediation and compensation already delivered through its Brazilian joint venture structures and argues the UK action is duplicative. The court has so far rejected this framing as a basis for dismissal.
• BHP shares on the ASX have corrected sharply from an all-time high of A$59.39 in early March 2026 to approximately A$52.81 in mid-March, driven primarily by China iron ore purchase restrictions and broader commodity market softness rather than litigation developments.
• The High Court’s finding that a UK parent can be held liable under foreign law for environmental harm caused by an overseas joint venture sets a precedent with broad implications for multinational companies with complex subsidiary and tailings dam exposure globally.
• BHP’s next earnings release is scheduled for April 2026, and analysts will be watching for any guidance on legal provisioning, settlement discussions, and updates on the Jansen potash project and the China iron ore supply dispute.
• The broader ESG and governance implication of the Mariana case is that parent company oversight of joint venture environmental risk management is now subject to legal scrutiny in home-country courts, a shift that will reshape how major mining companies structure and oversee cross-border operations.