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Nowadays surveying ? geological departments of Polish coal mines conduct forecasts of leverages of underground mining on area and construction works based on J. Bialek?s formulas including, among others, distant leverages, reactivation of old workings and mining margin. The objective of this article is the adequacy study of the conducted forecasts of area deformation in this way with relation to real values of deformation indicators confirmed by surveys. For this purpose, an example of a really terminated exploita...