Geological explorations of clay deposit near Pragersko and clay quality tests

Abstract

A series of illite clays located near Pragersko, at the Southern boundary of the Maribor - Ptuj depression, was investigated. The results of mining geological investigations showed the extension and characteristics of clay occurrences in the area. Primary characteristics of single types of raw clay from the deposit (mineral composition, grain size distribution, plasticity, etc.), and the quality of biscuit were determined with laboratory tests. In a 4-9 m thick bed of clay we identified four different types of clay, which are, as a mixture, suitable for use in brick industry.