Highfield Resources Ltd (ASX:HFR) has moved a step closer to resolving a key legal dispute surrounding its flagship Muga potash project in northern Spain after the Spanish Supreme Court formally admitted appeals relating to the Goyo mining concession.
The decision opens the way for a full judicial review of the procedural ruling that previously annulled the process under which the concession was granted, while leaving intact the technical and environmental foundations of the project.
The appeals were lodged by the Governments of Navarra, Aragón and Spain, along with Highfield’s Spanish subsidiary Geoalcali, following a ruling by the Superior Court of Justice of Navarra (TSJN).
That earlier ruling found a procedural flaw in the administrative coordination process used to grant the Goyo concession. The issue centred on whether a single unified mining concession should have been issued across the regions instead of the three separate concessions — Goyo, Muga and Fronterizo — originally granted in 2014.
Highfield said the TSJN decision did not question the Muga Project’s technical viability, environmental studies or underlying mineral rights.
The Supreme Court’s admission of the appeals now enables a higher-level judicial review aimed at clarifying the legal framework for cross-regional mining projects in Spain.
Environmental standing question flagged
In admitting the appeals, the Supreme Court also highlighted broader legal questions around whether an environmental organisation has the standing to challenge administrative matters unrelated to environmental legislation.
Highfield said the Supreme Court pathway offered the clearest route toward long-term legal certainty for the Muga Project, one of Europe’s largest undeveloped potash assets.
Financing implications emerge
The court decision also has implications for Highfield’s financing arrangements announced in October 2025.
Under the terms of the convertible note funding package, the remaining funding tranches had been contingent on the appeal not being admitted by the Supreme Court.
With the appeal now accepted, Highfield and the convertible note holders are required to negotiate in good faith on an alternative funding structure and the next steps for the project during the judicial review period.
The parties will have 30 days from the time the appeal timetable becomes known to agree on a pathway forward.
Key project approvals remain intact
Highfield noted that all other major approvals and concessions tied to the Muga Project, including environmental and technical permits, remain in force.
The company said it continued to work closely with authorities in Navarra, Aragón and Madrid as it advances the project and would update the market as the legal process progresses.