Morphologically diversified sulphide mineralization has been found in No.301 and Dinner Forks 302 coal seams (Westphalian B).The main sulphide is pyrite which forms veinlets cross-cutting the sedimentary fabrics of the coal, encrusts the cellular structures and intergrowths with oxysulphides.Two generations of pyrites were observed: the preceding and the following the oxysulphides.
Pyrite composition is stoichiometric, rare admixtures are up to(in wt.%): Mn - 0.19, Co - 0.48, Ni - 0.
42 and As - 1.41.Iron oxysulphides contain Bath up to 35.06 wt.
% oxygen.Their composition varies between FeS2O and FeS2O3.Increased contents of As (up to 1.46 wt.
%) and Pb (up to 0.96 wt.%) were detected.