Clark Fork River (IMAGE) Virginia Tech Caption The Clark Fork River is not as pristine as it appears. Heavy metals bound to nanoparticles occur in the river sediment and water hundreds of miles from a long-closed mine, now a Super Fund clean-up site. Credit Nicholas W. Haus Usage Restrictions With coverage of the JEM article License Licensed content 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.