The investigations of clay material from the interformational gold-bearing Bez-dubovo paleo-placer (Sysola basin, East European Platform) were carried out by X-ray dif-fractometry. Data obtained show the lithological control of the clay minerals distribution. These data also may confirm the genesis of the Bezdubovo paleo-placer as a formation with eluvial «roots». Smectite minerals are indicative for the weathered waterproof roof of early Triassic sediments. Kaolinite clays are of specificity for basal gold-bearing middle-Jurassic sediments as well as Pleistocene and Quaternary layers.