The objectives of the study are: 1. To determine the engineering (structural and hydraulic) properties of the material in the mine dumps, and the variability of these properties, from laboratory tests on a limited number of samples. 2. From these properties define and develop general criteria to insure stability, considering the structural characteristics and potential build-up of pore pressures. 3. From analyses of existing hydrologic data evaluate possible magnitude of overland flow, surface erosion, and sediment loads. 4. Indicate the type and amount of hydrologic and soil property data needed for better future design and placement of overburden materials.