The results of constructing the contour of an underground horizontal mine working of given dimensions and geometric structure based on the method proposed by the authors are presented, the stress state at the points of the contours of the working, the cross-sections of which have the shape of a vault with inclined walls and an ellipse, are given, the permissible laying depths are determined at given values of uniform pressure applied at the points of their contours. The criterion for

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... the permissible laying depth is the condition that there are no points on the contours of the workings at which the normal tangential stresses exceed the tensile and compressive strength of the enclosing rock.