Environmental groups are warning Territorians to pay attention to a plan by Energy Resources of Australia (ERA) to expand its uranium mine in Kakadu National Park.

They say they believe the ultimate goal of the company is still to mine Jabiluka.

Jabiluka, also located within Kakadu, is the world's largest known undeveloped uranium deposit.

In the late 1990s, ERA won the right to mine the area.

But the traditional owners, the Mirrar people, opposed it and the mine shaft was filled in.

Australian Conservation Foundation (ACF) spokesman Dave Sweeney says ERA has its eyes on a bigger prize than just expanding its existing Ranger Uranium Mine operations.

"It wants to stay active and in the region and wear people down, and wait for times to change," he said.

The Mirrar people are foregoing billions of dollars in royalties by opposing mining in Jabiluka, he says.

The ACF says ERA should abandon expansion plans at its Ranger Uranium Mine.

A new report prepared for the Federal Government shows climate change could damage mine infrastructure and pose challenges to its processing systems over the next 60 years.

Mr Sweeney says Ranger Uranium Mine's location within the boundaries of Kakadu National Park makes it too risky to expand.

"Environmentally, there will be increased water, increased storm events, increased surge activity," he said.

"It will be more difficult to manage water and waste in Kakadu.

"We have already already seen it this wet season.

"We have seen it for years, real problems with water and waste management at the Ranger Uranium Mine."

ERA says it incorporates climate modelling into its forward planning for the mine.

If climate forecasts change, it says it will adjust its plans accordingly.

Meanwhile, the organisation representing traditional owners of Kakadu National Park says Prime Minister Julia Gillard should immediately stop all plans to expand uranium mining in the park.

The Gundjeihmi Aboriginal Corporation represents the Mirrar people who have called for mining to cease at the Ranger uranium mine on their land.

Corporation executive officer Justin O'Brien says the climate change report on Kakadu released on Wednesday ignored the effects of increased storms and rising sea-levels on Ranger.

He says the Government has also neglected its promise to incorporate the nearby Koongarra lease into the national park and apply for world heritage listing.

"The commitment was given in the last federal election," Mr O'Brien said.

"Now is the time, in light of what we know at Kakadu, for the Ranger Mine expansion and the Koongarra Mine proposal to be taken off the table."