Acta Musei Moraviae

The mineral assemblages at the abandoned burning spoil-heaps in the Rosice-Oslavany Coalfield, Czech Republic

Mineral assemblages formed recently at the abandoned burning spoil-heaps of the Kukla coal mine in Oslavany and Ferdinand coal mine in Zastávka. They originated in three stages. Pyrometamorphic stage I T_max >1 100 °C produced hematite, corundum, cristobalite and various glasses (Si-rich sandstone dominant protolith). Minerals of ellestadite group, periclase, magnesioferrite, srebrodolskite, and accessoric cuspidine, kumtyubeite and rondorfite are typical for pyrometamorphosed dolomite-anhydrite-gypsum dominant protolith. Relics of early “fumarolic” phase, with minerals crystallizing from gas exhalations at T >100 °C (sulfur, sal ammoniac), including products of rock decomposition by hot gases, are present only locally. The spoil-heaps cooling stage II produced calcite, aragonite, gypsum and anhydrite. In the final stages III the atmospheric water infiltration and evaporation produced gypsum, jarosite and magnesian sulfates (hexahydrite, and others).