Properties and structure of hard coals from the borehole Niedobczyce IG-1 in Rybnik Coal District, Upper Silesian Coal Basin, their petrographic and group constituents. 1. Variations in properties of the coals along the depth of the borehole

Abstract

Studies were made of the properties and structure of hard coals from the borehole Niedobczyce IG-1 in Rybnik Coal District (Upper Silesian Coal Basin) collected from a depth of up to 1830m. Coals occuring there vary from gas flame 1 1 According to Polish classification of hard coals: flame coal (type 31), gas flame coal (t.32), gas coal (t.33), gas coking coal (t.34), orthocoking coal (t.35), metacoking coal (t.36), semicoking coal (t.37), lean coal (t.38), anthracite coal (t.41), anthracite (t.42). (611-VII) 2 2 According to the international classification and statistic groups. to orthocking (435-VB) types. Assessment of changes in quality and structure of the coals was based on the results of technical and elementary analyses, tests on coking properties and petrographic analysis. In the tested borehole the changes in the properties of coal take place in the conformity with the Hilt rule [1] with the exception of the Michałkowice overthrust strata, occurring however, in a relatively narrow and shallowest zone of the borehole. An interpretation of the changes ascertained is formulated and certain relations between the properties and the structure of coal were established.