Optimal density of the exploration network on deposits of refractory and refractory clays of the North-Western edge of Donbass

Abstract

Deposits of refractory clays in the northwestern part of Donbass are confined to the sandy-clay strata of the Poltava Formation of the Lower Neogene. Refractory clays lie on the Upper Paleogene sandy sediments of the Kharkov and Berek formations, they are covered by sands of the Poltava Formation or mottled clays of the Lower Neogene horizon of mottled clays, less often by Quaternary loams. ...