Millions of litres of radioactive water from the Ranger uranium mine have flowed into world heritage-listed wetlands in Kakadu National Park. Aboriginal traditional owners say they will oppose plans for a huge expansion of the 30-year-old mine by Energy Resources of Australia unless the company upgrades its environmental protection procedures. The Rio Tinto-owned company has attempted to downplay an unexplained spike in contaminated water flowing from the mine into Kakadu’s Magela Creek between April 9 and 11.