FIELD: mining industry. SUBSTANCE: productive level of deposit is exposed by production bore-holes and mining is effected by hexagonal cells with removing chambers of first and second stage. Chambers of first stage are worked in the form of vertical slots in counterdirection over perimeter of hexagonal cell. After working-out of chambers of first stage and their filling through perforated operating tubes, chambers of second stage are being worked under protection of artificial pillar. EFFECT: high efficiency. 2 dwg
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