Аңдатпа
Geological characteristics of ore and enclosing rock mass at Orlov deposit, including Severnoe body of Novaya ore shoot, are given. The ore is extracted by underground method, with slicing and roomand- pillar, and sublevel caving. The technology of backfill preparation based on cement–slag binder is evaluated. After lab experimentation, the rational compositions of the backfill have been developed for Orlov Mine. It is found that activity of granular blast-furnace slag is conditioned by chemical composition, structure and, to a wide extent, by grinding fineness (specific surface). The technical-and-economic assessment of the new technology of backfill preparation has been carried out.