[en] Uranium mining operations release some radioactive materials into both air and water and generate large quantities of solid wastes containing low levels of radioactive materials. Solid wastes produced by past mining operations remain on the surface at many inactive mining sites, and represent a potential health and environmental hazard similar in concept to uranium mill tailings. Contamination of surface and subsurface water supplies also represents a potential problem. To evaluate these potential problems, the Congress, in Section 114(c) of the Uranium Mill Tailings Radiation Control Act of 1978 (UMTRCA), instructed the Administrator of the Environmental Protection Agency (EPA) to prepare a report which identifies the location and potential health, safety, and environmental hazards of uranium mine wastes together with recommendations, if any, for a program to eliminate these hazards. This report analyzes the potential health and environmental impacts of both active and inactive uranium mines, lists the locations of these mines, identifies additional information needs, and recommends needed actions