The Cyprus Tohono Mine settled a NRDAR case based on releases of hazardous substances into evaporation ponds, a pit lake, and calcine leach residue ponds. Elevated concentrations of arsenic, cadmium, copper, selenium, zinc, sulfuric acid, uranium (as a metal), uranium radionuclides, and adjusted gross alpha activity (a measure of alpha-emitting radionuclides including thorium-230, radium-226, and radon-222) were found in these waters. In addition, other hazardous substances were found present in some source areas.