The West Arnhem Shire Council says it expects 70 more contractors will lose their jobs at Ranger uranium mine in the Northern Territory now that the mine will not re-open until July.

The mine, inside Kakadu National Park, was supposed to start operating again this month but Energy Resources Australia (ERA) has extended its suspension of work.

ERA says heavy rain during the wet season dumped too much water in its tailing dams and operating pit.

West Arnhem Shire councillor David Norton says he is concerned more people will be forced to leave Jabiru.

"This is a repeat of last March, when contractors were stood down after the pit was filled with water," he said.

Meanwhile, traditional owners of land used for uranium mining say poor environmental management means they are losing money as well as the use of their land because of the suspended Ranger mining.

ERA says it is being environmentally responsible by extending the suspension, which has been in place since January.

But Justin O'Brien from the Gundjeihmi Aboriginal Corporation, which represents traditional owners, says it also hurts vital social programs.

"Gundjeihmi has a major socio-economic development agenda, which we're funding out of mining royalties," he said.

"This economic overindulgence that's brought us to this point, this lack of planning for high wet seasons, lack of inclusion of climate change in the story, means that we will get less royalty."