METHOD OF DEVELOPMENT OF STEEP ORE Russian patent published in 2009 - IPC E21C41/16 

FIELD: mining.

SUBSTANCE: breaking of block stock is performed by means of inclined-directed down boreholes drilled from airway entry. To bore inclined sections of boreholes a common vertical section is used. Charging of boreholes is performed before the point of undercutting of the inclined section; the angle of layers incline is accepted as exceeding a minimal angle of incline to horizon of inclined sections of boreholes. Distance h between magnetised ore and ore massif is determined out of expression h=1.5W, where W is the line of the least resistance, m.

EFFECT: increased efficiency due to possibility to combine process of ore discharge and borehole drilling, increased safety of works and possibility to implement method in ores of medium and low stability.

1 dwg