METHOD FOR SHOOTING OF ORES AND ROCKS ON UNDERGROUND MINING WORKS Russian patent published in 2013 - IPC F42D3/04 F42D1/08 E21C41/16 

FIELD: mining.

SUBSTANCE: method for shooting of ores and rocks on underground mining works includes drilling-off of a broken volume by opposite wells or blast holes, drilled from upper and lower drilling mines, their charging and exploding. An initiating charge in each well or blast hole is arranged at the distance L_a=2.25•d_w, m from the bottom of the well or the blast hole, where: d_w - diameter of a well or a blast hole, m, and distance between ends of opposite wells or blast holes determining thickness of a broken layer, is accepted as equal to L=2•R_r.e.+0.9•D_o, m, where L - distance between ends of opposite wells or blast holes, drilled from upper and lower drilling mines, m; R_r.e. - radius of a damage zone from end action of a charge, m; D_o - diameter of a bulk piece, accepted for the applied technology, m.

EFFECT: reduced specific and total flow rate of drilling, due to increased efficiency of using explosion energy.

3 dwg