Earth tides and seismic activity in deep coal mining ...
2021-12-1 · Mining of hard coal deposits in the USCB has been carried out for over 250 years. Initially, it was carried out opencast on the outcrops of the richest beds and, over time, it extended to deeper seams. At the peak of coal mining in Poland in the late 1970s and early 1980s, there were 65 active mines operating in the USCB, extracting a total of ...