Better understanding of the occurrence and functioning of the floods on karst poljes that gives base for more successful hydroengineering in karst. Mapping and characterization of fault zones in the Velenje basin with regards to coalbed gas migration and storage, and their influence on the safety of coal mining. Determination of chemical and isotopic composition of coalbed gas in the Velenje basin, and determination of sorbtional properties of gas with respect to coal. Investigation of durability of the Cretaceous limestones from Slovenian quarries by accelerated aging. An improved stochasticmethod for predicting surface subsidence due to underground minig was developed.