Paul Locke, chairman of the committee that wrote a National Academy of Sciences report on the safety of mining uranium in Virginia, says "there are still many unknowns" about the safety of lifting a ban on mining the radioactive material. (Associated Press)

Paul Locke, chairman of the committee that wrote a National Academy of Sciences report on the safety of mining uranium in Virginia, says "there are still many unknowns" about the safety of lifting a ban on mining the radioactive material. (Associated Press)