Uranium Mill (image) American Chemical Society Caption In a new study, scientists question the sustainability of nuclear power because of anticipated declines in high-grade uranium ore. Above is Australia's Ranger uranium mill. Credit Gavin M. Mudd Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.