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Activists Win Landmark Climate Change Case over MACH Mine Extension

The ruling sets a national precedent and affects 17 coal proposals in the NSW planning pipeline, according to the court.

  • On Wednesday, the High Court dismissed MACH Energy's appeal, upholding a lower court ruling that the Mount Pleasant coal mine expansion approval breached mandatory legal obligations under environmental planning law.
  • Retired teachers Wendy Wales and Tony Lonergan led the Denman Aberdeen Muswellbrook Scone Healthy Environment Group in challenging the project, which sought to double yearly output to 21 million tonnes and extend mining until 2048.
  • Judges ruled the Independent Planning Commission failed its mandatory obligation under s.4.15 of the Environmental Planning and Assessment Act 1979 by ignoring how exported coal pollution affects local climate risks including bushfire, drought, and flooding.
  • The project's approval remains invalid following the judgment, requiring referral back to the NSW Land and Environment Court or the IPC for reassessment of the mine's contribution to local climate change impacts.
  • Across the NSW planning system, the ruling sets a binding national precedent directly affecting 17 coal proposals currently in the pipeline and establishing a legal template for future climate litigation across Australia.
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17 Articles

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Environmental activists achieved a historic victory in the Australian High Court.

·Helsinki, Finland
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PerthNowPerthNow
+2 Reposted by 2 other sources
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Local environmentalists trump coal mine in High Court

Community environmentalists have beaten an international mining company in Australia's High Court, cementing a landmark finding for climate change cases.

·Osborne Park, Australia
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maitlandmercury.com.au broke the news on Tuesday, October 6, 2026.
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