Abstract
Carboniferous rocks and colliery spoil samples representing all the stratigraphic series of the coal-bearing formation of the Upper Silesian coal basin (USCB) in Poland, as well as toe drainage from the spoil tips were examined with respect to the contamination potential of colliery spoils as a function of the balance between the buffering and acid generation capacities. The susceptibility of spoils and leachates to acidification was estimated experimentally. Data obtained for representative samples of fly ash from coal-fired thermal and power stations indicate that an effective increase of buffering capacity of low-buffered colliery spoil, and hence a significant abatement of water contamination, could be achieved by means of controlled placing of fly ash layers in the colliery tip during its construction.
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