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The Federal Court’s decision to overturn the Commonwealth’s controversial heritage declaration affecting Regis Resources’ McPhillamys gold project has offered some reassurance to mining investors, while highlighting the regulatory uncertainty that continues to confront major Australian developments.
Regis Resources (ASX: RRL) has welcomed the judgment declaring legally invalid the Section 10 declaration made by former federal environment minister Tanya Plibersek under the Aboriginal and Torres Strait Islander Heritage Protection Act 1984.
The August 2024 declaration affected part of the approved McPhillamys project site near Blayney in central western New South Wales, disrupting development plans for one of Australia’s largest undeveloped open-pit gold projects.
For investors, the decision provides greater clarity around the legal requirements governing federal heritage protection decisions, although it does not guarantee the project’s approval pathway is clear.
Regis managing director Jim Beyer described the judgment as a significant milestone.
“After considerable delay and uncertainty, and more than two years of time lost, we are eager to move forward,” Beyer said.
A test of regulatory certainty
The McPhillamys dispute has become a prominent example of the risks associated with late-stage government intervention in mining projects that have already secured environmental approvals.
The Minerals Council of Australia (MCA) said the Federal Court decision helped restore confidence in the integrity of Australia’s regulatory processes.
The council noted that Regis had secured NSW and Commonwealth environmental approvals following extensive assessment and engagement with the Orange Local Aboriginal Land Council.
According to the MCA, the subsequent Commonwealth intervention placed more than $1 billion in proposed investment at risk.
The Association of Mining and Exploration Companies (AMEC) also welcomed the judgment.
“The ruling is a welcome victory for common sense and an important opportunity to restore confidence in Australia’s project approvals system,” AMEC chief executive Warren Pearce said.
The broader investment implications extend beyond McPhillamys.
Regulatory certainty influences how mining companies assess development risk, allocate capital and determine whether projects can generate acceptable returns.
The controversy was also highlighted in the Fraser Institute’s 2025 Annual Survey of Mining Companies, which cited an industry respondent describing the McPhillamys decision as a deterrent to investment.
What happens next?
Importantly, the Federal Court ruling does not constitute a final determination on the merits of the original heritage protection application.
As reported by the ABC, Justice Stellios determined that the matter should return to Federal Environment Minister Murray Watt for reconsideration.
Watt said the judgment concerned an error in the decision-making process rather than the merits of the declaration.
This distinction matters for investors because the project remains exposed to a further ministerial decision, which could again affect its development pathway.
Regis intends to participate in the redetermination process while continuing to advance an alternative development option.
Outlined in its recent pre-feasibility study, the alternative involves an Integrated Waste Landform combining filtered processed ore and waste rock in a single facility, avoiding the area affected by the original declaration.
The project contains an ore reserve of 56 million tonnes grading 1.1 grams per tonne gold for 1.89 million ounces.
For Regis shareholders, the next catalysts will be the ministerial redetermination and progress on the alternative development plan.
The ruling has gone some way towards restoring confidence in the legal oversight of mining approvals, but the McPhillamys experience demonstrates why regulatory certainty remains central to project valuations and investment decisions.
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