High seismic activity on Coal Mine “Ziemowit”, occurred at the beginning of the eighties, was a big surprise for a mining science. Mining seismicity has been connected with exploitation of coal seams 207, 208 and 209 – laziskie series. Theory, that low strength rock formations cannot generate high energetic tremors (1E5 - 1E7 J and more) has been verified by the reality. Since that time a Geophysics Station on Coal Mine “Ziemowit” has recorded more than 1300 such tremors. In this paper presented level of seismic activity and rockburst danger in Coal Mine “Ziemowit”. It has been shown changes in the way of calculating rockburst danger and paid attention for the necessity of further studies of mine tremors phenomena.


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