METHOD OF UNDERGROUND MINING OF DEPOSITS BY SUBLEVEL CAVING ONTO STORED ORE Russian patent published in 2001 - IPC

FIELD: mining industry; applicable in underground mining of thick ore deposits including kimberlite pipes in zones of permafrost rocks. SUBSTANCE: method includes driving of sublevel workings, layer-by-layer breaking of ore on sublevels onto stored ore and partial ore drawing after breaking of each layer through end of sublevel working simultaneous portion ore drawing on haulage horizon of level. According to technical solution, partial drawing of stored ore on the first sublevel is made in portion volume Q determined by expression Ql= Vl(K1-K2), where Q1 is volume of portion of ore partial drawing after breaking of each layer of ore on the first sublevel, cu.m; V1 is volume of zone of ore flow in face space above sublevel working within boundaries of mined first sublevel, cu.m; K1 is coefficient of ore loosening in zone of flow, K1=1.45-1.65; K2 is ore loosening coefficient after blasting of layer onto stored ore, K2=1.1-1.15. In mining of each next sublevel n, portion volume Qn of partial drawing after breaking of each ore layer onto next sublevel is determined with consideration of volume Vn of flow zone formed in remaining stored ore of earlier mined sublevels by formula Qn= V1(K1-K2)+Vn(K1-K3), where Vn is volume of zone of ore flow in remaining stored ore from the first, second, third and n-th sublevels, cu.m., Vn= V1+V2+V3+A+Vn-1; K3 is coefficient of loosening of stored ore, k3=1.15-1.20. In this case, after ore breaking in the last sublevel, corresponding portion drawing of stored ore is effected. EFFECT: reduced amount of stored ore and reliable ore drawing. 2 cl, 8 dwg, 1 ex