FIELD: mining industry. SUBSTANCE: driven in mineral bed is water-diversion ditch which is extended in course of mining with deepening into payable part of placer, in bedrocks. Ditch is arranged over axis of open pit, closed with reinforced concrete slabs with pyramidal convexity on outer side. In so doing, opening of pit, transportation and laying of rocks, driving and equipping of water-diversion ditch are carried out simultaneously with mining operations. EFFECT: higher efficiency. 5 dwg
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