The evaporite sequences of eastern Slovakia were formed from the late Permian to the early Scythe and occur in the Gemericum and the Meliata belt of the Western Carpathians. Deposition took place in a shallow marine environment with subsequent transportation of the unconsolidated sediments into deeper parts of the basin. Due to the proximal sedimentation, clasts and detrital components can be found within the evaporites. Calcium sulphates, halite and sylvine are the main salt minerals. As country rocks, carbonates and siliciclastics can be found. Deposition of the calcium sulphates happened as primary anhydrite; Afterwards in zones where water was available, gypsum was formed. The evaporites can reach 1.000 m in thickness and are divided into structural blocks by tectonics. The Spisker- and the Gemeric deposition belts can be separated. Both, anhydrite and gypsum are mined in three locations. The calcium sulphates of the Slovakian deposits under investigation are used as regulator in cement production. The content of heavy metals is very low, so there is no need to subsidise the natural product with synthetic sulphates. As no radioactive elements are found in the evaporites, the radon in the mine of Spisk Nov Ves is more likely to have another origin. There is a clastic stratum with uranium mineralization occurring in the underlying rocks, which can be a possible source.