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Mining operations performed within the northern part of of deep copper Polish mines are associated with a relatively thick (up to 200 m) and broadly extended salt rock stratum. Since in the above area of planned copper ore exploitation large salt chambers exist and new ones will be mined-out, their safe dimensions have had to be found. The understanding of the mechanism of interaction between the workings? elements such as pillars and immediate roof strata excavated within the salt-rock body, required developing a...