Under the Solid Waste Disposal Act of 1965, the Bureau of Mines was authorized to conduct research on methods for utilizing, stabilizing, or reclaiming mineral wastes. This report summarizes Bureau laboratory research and cooperative field studies made with the mineral industry to reduce the environmental impacts of air and water pollution from mineral wastes. Utilization research showed that both dry-press and steam-cured building bricks and ceramic tile could be made from copper mill tailings and other mineral wastes. Sponge iron was produced from steel mill and amination industry wastes, and valuable mineral products were extracted from sources as flue dusts and uranium tailings. Mineral wastes were combined with agricultural and/or sewage wastes to make artificial soils, a useful commodity. Physical, chemical, and vegetative stabilization methods were evaluated, singly and in combination, for reclamation potential on copper, uranium, lead-zinc, and asbestos tailings. Suitable methods were developed in the laboratory for overcoming major adverse conditions of these wastes such as salinity, heavy metal toxicity, acidity, basicity, lack of nutrients and organics, and unstable surfaces. Field testing of these methods was performed on a variety of mineral wastes. Costs for the procedures developed were also determined.