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This-paper presents the geological structure and the overall stratification development history of the Balinka (Hungary) brown coal deposit for the last -200 million years. The actual coal stratification was formed at the beginning of the Eocene period and detailed compositions of the strata are reported. The hydro-geological conditions are discussed in relation to the mining operation safety. The coal mining operation started in 1922 and the present recoverable coal reserves are estimated at 17,202 k-ton with an average heat capacity of the material of 13,741 kJ/kg. sets. A three-factor model can interpret the data sets reasonablv well. Trace elements cadmium, cobalt, lead, copper, nickel, inorganic sulfide and total sulfur in coal are correlated with the first factor. Trace elements bervllium. sulfate and organic sulfide are correlated with the second factor and trace elements chromium and arsenic are correlated with the third factor. The chemical properties of these elements are used to interpret the factors. 99101760 How far does chemical structure of coals become apparent? Nomura, M. Kagaku to Kogyo (Tokyo), 1998, 51, (lo), 1579-1582. (In Japanese) van Krevelen's suggested coal structure is reviewed. An application of the Ruthenium Ion Catalysed Oxidation (RICO reaction) and '3C-nuclear magnetic resonance are utilized in the research.
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