Abstract
On the basis of the principles of development, improvement and creation of new systems, a working hypothesis is developed for the creation of a universal system of underground mining for the development of very thin and thin steeply dipping ore bodies or their individual parts, presented by both stable and unstable rock-ore massif, which is a combination of the system development by sublevel drifts with slotted ore excavation (in case of stable rock-ore massif) and development systems with ore shrinkage with bore holes from rising holes (in case of unstable rock-ore massif). The new universal combined system for the development of sublevel drifts with slotted excavation and with boreholes from rising holes allows to ensure the safety of the introduction of underground mining and high qualitative and quantitative indicators of ore extraction at any degree of stability of the natural ore massif.
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