Environment groups have slammed federal environment minister Tanya Plibersek's refusal to stop the approvals of four coal projects, including the Mt Pleasant mine expansion near Muswellbrook.
The approval will extend the mine's life by 22 years to the end of 2048, a result that opponents argue would result in more than 800 million tonnes of carbon emissions.
Mt Pleasant was among 19 coal and gas projects Environment Justice Australia, acting on behalf of Environment Council of Central Queensland, applied under federal laws to have thrown out before they had completed their full environmental assessments.
The group argued that the potential emissions from the projects should rule them out of any further consideration.
But in order to stop a project from proceeding, federal laws require proof that its emissions would be a substantial cause of climate change effects on the Australian environment.
Ms Plibersek's department said on Thursday night that this had not been proven in regard to Mount Pleasant, the Narrabri Coal mine expansion, the Ensham coal mine extension and the Isaac River coal mine, both of which are located in Queensland's Bowen Basin
"The Albanese government has to make decisions in accordance with the facts and the national environment law - that's what happens on every project, and that's what's happened here. Since the election we've doubled renewable energy approvals to a record high. The government will continue to consider each project on a case-by-case basis, under the law," federal Department of Environment spokeswoman said.
The Environment Council of Central Queensland said it was considering all legal options including a Federal Court challenge and any injunctions needed.
"Today's decision means Minister Plibersek joins a long line of federal environment ministers who have said it's not their job to consider the climate risk of new coal and gas mines," President Christine Carlisle said.
"We're already dealing with floods, bushfires, and droughts and the evidence shows these new coal and gas proposals will make the devastation much, much worse.
"This is the real test for the minster. Australians who voted in favour of climate action have a right to feel betrayed by these decisions. We want our kids and our grandkids to be able to experience our natural wonders."
In giving its conditional approval for the expansion last year, the planning commission said the project would provide up to 447 direct and indirect jobs in the Muswellbrook and Upper Hunter, 643 jobs in the wider region, and 444 jobs elsewhere in NSW.
Mt Pleasant is also one of the few known habitats of the Hunter Valley Delma. The Delma is a species of legless lizard endemic to the Hunter Valley and Liverpool plains and was found on the mine site by researchers from the Australian Museum in 2022.
The Climate Council said Ms Plibersek's ruling was 'reckless' and 'out of line with the science'.
"This decision takes us in entirely the wrong direction to protect Australians from the worsening effects of dangerous climate change," Climate Council head of advocacy Jennifer Rayner said.
"The environment minister has a responsibility to scrutinise all risks of harm to the environment, and it is irresponsible that she has refused to look at the immense and indisputable climate harm that all new coal and gas projects pose.
"We cannot have new, highly polluting coal as we're living through the age of climate consequences. What we need is far more action to boost clean energy sources which can replace coal altogether, like the renewable hydrogen investments the government started in this week's budget."
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