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In September2009, gas and rock were ejected from the roof of the excavation at the Rudna copper mine of KGHM Polska Miedź S.A. The ejection occurred as a result of an unsealing of a small gas trap locateda few metres above the roof of the excavation within the dolomites of the first Zechstein cyclothem (PZ1). In order to identify the nature of the reservoir rock for natural gas, microscopic observations...
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