Development of the technology of stowing the developed space during mining

An analysis of the world experience in development potash deposits shows that main problems arising during their are a high level mineral losses, an increased risk flooding mine workings as result water-proof layer discontinuance and emergency water inflows mined-out spaces. Reduction ore losses can be achieved by using long-pillar mining system, but this method is limited peculiarities geological structure need to preserve continuity its underworking. The safety underworking improved stowing developed longwall space. However, question influence on height zone supply cracks remains little-studied. spaces layers with long pillars analyzed technology placing masses, which solve these problems, proposed. considered proposed solutions supported laboratory tests materials mathematical modeling deformation zones overlying rocks.