The Bureau of Mines investigated the concentration characteristics of high-clay sylvanite ores from four potash companies operating in the Permian Basin near Carlsbad, New Mexico. These ores, containing 13 to 22 percent k2o and 3 to 7 percent clay slimes, cannot be effectively processed by current commercial flotation methods because of their high slime content. A solution to this problem was shown to be the use of two-stage moderate scrubbing conditions and washing of the ore as opposed to strenuous attritioning. Bench- scale physical beneficiation techniques for recovering potash minerals and the development of ore-dressing systems by flotation resulted in obtaining acceptable product grades and recoveries. By using a coarse grind, emphasis was placed on the production of premium granular and coarse products. Flotation results showed that concentrates of 58.7 to 60.4 percent k2o with recoveries of 71.0 To 83.4 percent of the k2o values can be obtained.