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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...

The article presents the way of conducting a forecast of leverages of underground mining run by longwall fronts in three deposits of hard coal on the area. The forecasted values of subsidences, inclinations and curvatures of mining area were calculated by the Budryk- Knothe theory with the use of typical values of its parameters, namely, a coefficient of subsidence of floor rocks equal to 0.8 and tangent of scope angle of main leverages amounting to 2.0. The forecasts of indicators? values of area deformation were...