The Northern Territory Government has given approval for further exploration at the Ranger uranium mine in the Kakadu National Park.

Energy Resources of Australia needs approval from both the Commonwealth and Territory Governments to go ahead with its underground exploration project.

The company has discovered another significant ore body at the mine which lies within Kakadu National Park.

It wants to do more drilling and build a tunnel up to three kilometres long and about 300 metres underground.

Earlier this year, the Commonwealth decided the company did not require environmental approvals to go ahead with the project.

Today, the Territory Government has also given the green light for ERA to start its exploration plans.

The company says it will soon begin a $4 million feasibility study.

If all goes to plan, work on the tunnel will begin next year.