Birgenheier on waste pile (IMAGE) University of Utah Caption University of Utah geologist Lauren Birgenheier inspects samples at coal processing waste pile. Credit Michael Vanden Berg, Utah Geological Survey Usage Restrictions Editorial use only License Original 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.