This bulletin summarizes the results of Bureau of Mines investigations of a technique for dewatering clay waste that consists of flocculation with polyethylene oxide (peo) followed by screening of the resulting flocs. Results of laboratory tests and small- and large-scale field tests are described. The peo dewatering technique has been applied to clay wastes from phosphate, coal, bentonite, and potash operations and to tailings from uranium, talc, and mica mining operations. Fundamental studies to determine the mechanism of peo interaction with clay particles are also described. This report is based upon work done under an agreement between the University of Alabama and the Bureau of Mines.