Gomeroi Native Title claimants will seek legal advice following the decision made by the National Native Title Tribunal to approve a coal-seam gas project on Gomeroi Country in the Pillaga Forest.

On Monday the tribunal ruled Santos's Narrabri Gas Project and proposed mining leases should be granted, which includes 850 new gas wells, despite Gomeroi people not consenting.

The project is being opposed by the 'Gomeroi applicant', a group led by 19 Gomeroi people who in 2011 filed a native title claim over the land which is yet to be determined.

The Gomeroi group said they are "deeply disappointed" with the decision considering the lack of agreement between Santos and the Gomeroi people.

A member of the Gomeroi applicant and a representative for the Narrabri and Wee Waa region, Lee-Ann Pearl Davern, said the Pilliga "has always been a part of who we are as Gomeroi people".

"It's hard to describe that deep of a connection in words but our connection to the Pilliga has always been there for us - we have continued to live and survive off the Pilliga," she said.

"If the Narrabri Gas Project goes ahead we feel we will lose a core part of us."

Ms Davern said following the tribunal's decision the group will be taking on legal advice to understand their options.

The decision from the tribunal also comes a month after the Australian Government responded to the Joint Standing Committee on Northern Australia's report into the destruction of Juukan Gorge.

Another member of the Gomeroi applicant and representative for the Pilliga and Baradine region, Sheryl Nicholls, said she was disappointed by the tribunal's decision given the Australian government's previous commitment to not allow another destruction of a cultural site.

"Gomeroi people have the right to be properly consulted and to make decisions about mining and gas projects in Gomeroi Country," she said.

"Gomeroi people should have to provide their free, prior and informed consent for such projects in accordance with the United Nations Declaration on the Rights of Indigenous Peoples."

In a statement issued Monday Santos said they want to continue to work in consultation with First Nations people and native title holders.

"Santos will continue to engage constructively with the Gomeroi people and work closely with them to ensure their heritage is protected and they benefit from the project development in range of ways, including through training and employment, and involvement in all aspects of their cultural heritage protection and management," the company said.

"Santos has a strong track record of working collaboratively with First Nations peoples in Australia and internationally."

Following the tribunal's decision an appeal of the decision can be made within 28 days to the Federal Court of Australia.