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In the protective pillar of the shaft in the mining area North Plant 2 the mining method Room and Pillar was practised on for trial from May 2014 to October 2017, which was suggested as inovation of the mining method Room and Pillar. The task of trial operation was to prove the utilization of the mining method under conditions of underground coal mines in the Ostrava-Karvin? coalfield. The principle of the mining method is leaving stable coal pillars to support the overlying layers and then extensive separation in...