Energy Resources Australia looks likely to pursue a second expansion of its Ranger uranium mine within Kakadu National Park amid buoyant demand for yellowcake on world markets.

The company has today held its annual general meeting in Darwin, telling shareholders that a full feasibility study to expand the mine should be completed mid-year.

The company began work on its first expansion last September.

ERA produces 10 per cent of the world's uranium and the company's chief executive officer Chris Salisbury says the higher price for uranium has made previously uneconomic deposits viable.

"We're looking at a range of options. Those options at this stage still finish at 2020, however there's possibility for us to extend past 2020 and clearly we looking for additional resources because we continue to do quite a significant amount of exploration on our leases."

A Darwin environmentalist says the expansion of Ranger will produce far more radioactive waste than was every imagined for the mine site.

Justin Tutty from the Northern Territory Environment Centre says his interested to see how ERA will manage the expansion.

"Perhaps this is welcome opportunity to have a fresh look at Ranger mine. Its turned into a much different beast than was looked at 30 years ago, so I would like to see ... a full environmental assessment."