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The use of development systems with open mined-up space due to increased technological risks associated with ensuring the sustainability of the rock mass. The main production technique that improves the safety of refining operations under these geotechnologies in the conditions of considerable depths is a multiple increase in the size of various types of pillars, leading, in turn, to a significant increase in mineral loss. Today, the mining situation of most steeply dipping polymetallic and gold deposits is due to...