In connection with a gradual extraction of ore areas in a valley, with the aim of support of annual output of the Koashva open-pit mine, a necessity arises in involving in the mining of near-ore bank reserves, located in the north-west bench of open-pit mine. For uncovering and mining of near-ore bank reserves it is necessary to assess the geodynamic and geomechanical conditions for support of the safe mining operations. The article describes the solution of this problem by means of software product 3DEC of Itasca firm.