In the range of ecological properties, studies contain:

• determination of total sulphur contents in coal and ashes using the X-ray fluorescence method;
• determination of pyrite sulphur contents in coals by the Mössbauer effect method;
• determination of heavy metals and toxic elements contents in coals and ashes by the X-ray fluorescence method;
• determination of naturally occurring radioactive elements in coals and furnace waste materials using the gamma spectrometry method.

• the sieve analysis of hard elements of coal mineral ballast;
• comparative determination of milling capacity of coal in dependence on amount of mineral ballast and mechanical properties of its components.

• assessment of an influence of coal combustion on contamination of natural environment by heavy metals and toxic elements as a result of dust emission and wastes storage;
• assessment of usability of ash and slag as secondary materials for building industry,
• basing on ITB instruction No. 234; specific activities and index of summarized specific activity of naturally radioactive isotopes of ⁴⁰K, ²²⁶Ra, ²²³Th have been determined;
• assessment of erosive properties of coals;
• a complex selection of coal sorts, especially for big urban agglomerations, in respect of
• ecological properties of coals and resulting furnace waste materials, and erosive properties of ballast contained in coal.