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In the development of mineral deposits by the underground method, geomechanical processes are manifested, which significantly affect the quality of ore, the cost of production and the safety of mining operations. Insufficiently valid choice of geomechanical steady spans of outcrops can lead to a sudden collapse and formation in clearing workings, thereby reducing the safety of mining. The work provides a definition of sustainable roof exposures of the clearing workings according to the method of S.V. Vetrov for fr...