OPEN-CAST MINING METHOD

FIELD: mining industry, particularly for open-cast mining of steeply inclined, even vertical, laterally bounded ore body, for instance diamondiferous kimberlite pipe under flooded conditions. ^ SUBSTANCE: method involves forming hydraulic-mining dump; opening quarry field by pit excavation; filling the pit with water; installing floating pump dredger in plant with cutter; performing rock excavation at quarry field; transporting the obtained rock to ground surface through pulp conveying line and conveying dead rock to hydraulic-mining pump. The quarry field is previously zoned into horizontal layers (horizons) and quarry field development is performed by cutting horizontal layers in top-bottom direction so that water level is lowered as layers are excavated and water surface is maintained at current production horizon level. ^ EFFECT: reduced power and cost inputs for field dewatering. ^ 3 cl, 2 dwg