Município De Mariana v BHP Group (UK) Ltd & Anor [2026] EWHC 73 (TCC) Knowledge Check

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Município de Mariana and others v BHP Group (UK) Ltd and another
[2026] EWHC 73 (TCC) | Technology and Construction Court, London
Before Mrs Justice O'Farrell DBE | Heard 17 December 2025 | Handed down 19 January 2026
Knowledge Check
Stage 1 costs, payment on account, interest and permission to appeal

This Knowledge Check examines the consequentials judgment following the Stage 1 trial in the Município de Mariana proceedings. The claimants had obtained findings on strict and fault-based liability, prescription and municipal standing, while the defendants had succeeded on several alternative issues.

The court decided whether to make an immediate Stage 1 costs order, whether the claimants' recovery should be reduced, the amount payable on account, pre-judgment interest and the timing of detailed assessment. The claimants presented total costs of about GBP 189 million and sought GBP 113.5 million on account.

The defendants were ordered to pay 90 per cent of the Stage 1 trial costs, with GBP 43 million on account. Payment was stayed pending the permission or appeal process. The court awarded pre-judgment interest, deferred detailed assessment and refused the defendants permission to appeal.

This Knowledge Check covers
  • The findings made in the Stage 1 judgment
  • The scope and timing of the Stage 1 costs order
  • The costs consequences of success and failure on different issues
  • The 10 per cent reduction in recoverable costs
  • The standard-basis detailed assessment
  • The evidence supporting the payment-on-account request
  • The calculation of the GBP 43 million payment
  • The stay pending the appeal process
  • Pre-judgment interest and timing of detailed assessment
  • The refusal of permission to appeal
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This Knowledge Check is provided for educational and professional development purposes only and does not constitute legal advice. The content reflects interpretations and analyses that may not apply to specific circumstances. Contract interpretation depends on specific wording, jurisdiction, and factual context. Always consult qualified legal professionals before making decisions based on this content. SCCSI and its contributors accept no liability for reliance on this material.