Nationals leader David Littleproud has vowed the Coalition will approve a controversial $1 billion gold mine if it wins the next election after rare intervention last month from Federal Environment minister Tanya Plibersek jeopardised the project.

Speaking alongside fellow critic and Liberal Party senator Jacinta Nampijinpa Price at the site of the proposed mine in the central NSW town of Blayney, Mr Littleproud criticised the Albanese government's handling of the issue after Ms Plibersek issued a Federal order to protect parts of the Belubula River that hold Aboriginal cultural value.

The Regis Resources gold mine had received numerous state and federal approvals before she issued a Section 10 of the Aboriginal and Torres Strait Islander Heritage Protection Act to block the project's tailings dam site.

Mr Littleproud on Wednesday said the resources sector deserved certainty if they were willing to invest in projects here.

"If they do the right thing, if they invest hundreds of millions of dollars into these types of projects … they need to be able to know that governments will follow through," he said.

"[The sector] is saying 'something's not right', and they're going to take their money and they're going to go somewhere else, and they're going to take those jobs somewhere else.

"We will approve this mine as soon as we're elected, because all the approvals have been granted, there should be surety."

Ms Price questioned why Ms Plibersek blocked the tailings dam because of the views of a minor Indigenous group and not the state's recognised Indigenous entity, the Orange Local Aboriginal Land Council, who didn't oppose the mine, which was set to create approximately 1000 jobs, a view the NSW Independent Planning Commission shared.

"Minister Plibersek has a lot of answers to give for the questions that are being asked by this community," Ms Price said.

"What is the point of having a land council if the minister is going to set a precedent, a very dangerous precedent, that can overlook this entity and go ahead and listen to any group that decides to inject itself into the decision-making process.

"To be anti-development is not good for this country when we want to attract investment for the benefit of everyone.

"But particularly so our Indigenous community members and those marginalised members of community who want to make sure that adults have a job."

Ms Plibersek has maintained the tailings dam cannot be built in the proposed area due its cultural impacts on the river and its headwaters, and insisted Regis had other alternative sites for it.

"They've told us they've investigated four sites for the tailings dam," she said on Tuesday.

"I certainly would urge them to have a look at some of those other sites they've investigated."