METHOD FOR EXTRACTING ORE DEPOSITS BY SUB-LEVEL COLLAPSING Russian patent published in 2007 - IPC E21C41/22 

FIELD: mining industry, possible use during underground extraction of ore deposits.

SUBSTANCE: method includes driving a mine outlet on a level: delivery drift, orts, loading ways, contouring drift, ventilating ascending mine, and also driving drilling mines, extraction of ore panels by fans of wells in compressed environment and outlet of extracted ore according to area-end circuit simultaneously through orts and loading ways under collapsed rock with ventilation of cleaning faces due to mine depression. As drilling mines, orts of outlet level are used. Ore panels are extracted which have rhombus-shaped cross-section, in layers of varying thickness. Outlet of extracted ore is conducted along these layers, alternating area-end circuit of outlet of extracted ore of one layer with end circuit of ore outlet of other layer. Rational parameters of exiting layers of extracted ore - width and thickness of layers - are determined from analytical expressions. Layer-wise outlet of extracted ore is performed in equal batches from loading way and ort or in 2:1 ratio respectively. Ventilation of cleaning faces is performed by feeding a flow of fresh air through delivery drift and orts with following release of polluted jet through loading ways into contouring drift and further into ventilating ascending mine.

EFFECT: increased quality and fullness of ore extraction, increased safety.

4 cl, 3 dwg