Green groups say they are horrified Clive Palmer's $6.4 billion coal mine and rail project has been approved in western Queensland.
The state's coordinator-general approved the Waratah Coal-China First Galilee Coal project on Friday, subject to strict conditions.
The mega project must also be approved by the federal government before it can go ahead.
The enterprise involves clearing thousands of hectares of vegetation on the Bimblebox nature refuge that is the habitat of the endangered black-throated finch and at least 220 species of plant.
The conditions include drafting species, weed, bushfire, erosion, water management plans.
But Greenpeace spokeswoman Louise Mattiesson says those are standard for mining projects and only require Mr Palmer to provide more plans without actually doing anything.
"We're horrified that the Queensland government could approve this massive, very destructive project," she told AAP.
"It just shows how weak the state's environmental laws are when it will bulldoze 14,000 hectares of bushland, including a nature reserve."
The Friends of the Earth and Lock the Gate Alliance (LGA), who held a protest against the approval outside state parliament on Friday, were also deeply concerned.
"The conditions make it clear that no one involved has properly studied the impacts," LGA spokeswoman Hannah Aulby told AAP.
"They should suspend this project immediately.
"The conditions are too weak and they've prioritised mining interests over everyone else."
Greens senator Larissa Waters said it would be the third massive coal mine the Newman government had approved in the Galilee Basin since coming to power last year.
"The three mega coal mines would significantly increase Australia's contribution to global climate change, producing 100 megatonnes of coal every year," she said in a statement.
"That's seven times more than the amount produced by Australia's current largest coal mine and more than one and a half times Queensland's total annual emissions."
Senator Waters added that coal would be exported through the Great Barrier Reef and turn the World Heritage Area into a shipping super highway.