In recent years, in the development of valuable ores of non-ferrous and ferrous metals, mining systems with concrete and cemented backfill are becoming more and more widespread. These systems make it possible in some cases to conduct simultaneous mining of deposits by open‑pit and underground methods, to preserve the surface from subsidence and collapse, in other cases – to produce advance excavation of rich ores, to extract the previously left pillars and to work fire‑hazardous deposits with relatively small losses and dilution. ...

The ore deposit developed by the Mayak mine consists of disseminated and massive ores. Massive ores are located below the bulk of disseminated ores in highly fragmented and crushed rocks with sharply reduced stability. The thickness of these rocks in the immediate roof varies from 0.3‑0.6 to 4.7 m, in the floor – from 0.5 to 5.5 m. The dip angle of the deposit varies within 3‑12°, increasing up to 25‑30° in some places on the flanks. The depth of mining is 200‑260 m.