Tailings 3 : Overburden and other waste rock from mining operations that contain concentrations of mineral ore that are too low to make typical extraction methods economical
U.S. Environmental Protection Agency, Radiation Glossary, Office of Radiation and Indoor Air Radiation Protection Division, Washington, DC, USA 2013. http://www.epa.gov/radiation/glossary/index.html#a , (Dzstr/ Rad Emr - Amer) {823}