Abstract
Coal wastes at the Jowisz coal mine in Wojkowice, Upper Silesia, Poland were deposited on a dump, which finally covered an area of ca 7 ha containing about 1,200,000 t of wastes. Processes of self-heating changed the properties and composition of the wastes, and generated fluids and melts resulting in the formation of new mineral phases. Based on the intensity of combustion, alteration in the dump can be divided into three zones, namely, a core zone with yellow and red slates welded with slag and paralava, an aureole zone with dispersed hematite and no paralava and an external zone unaffected by combustion. Samples of different grain sizes were collected from each zone to establish the mineral transformations that have taken place and to check actinide behavior during combustion. The most intense changes characterize very fine-grained wastes and paralava. It is clear that not only temperature, but also rock type, grain size, and local conditions such as oxygen access influence on the intensity of changes in the wastes.
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