METHOD FOR SEPARATE MINING OF CONTIGUOUS ORE BODIES OF COMPLEX MORPHOLOGY Russian patent published in 2024 - IPC E21C41/22 

FIELD: mining.

SUBSTANCE: invention relates to mining industry and can be used in separate mining of contiguous ore bodies of complex morphology, alternating with substandard mineralization. Method includes driving in each ore body of outlet, exploration drilling along the upper level and sublevel drilling drifts, drilling of ore bodies with inclined fans of wells, breaking in sections by 2-4 layers in clamp on caving rock, ore release through slot with leaving interlayers in worked-out space. Staged discharge is ensured by straightening of excavation contours and differentiation of ore crushing. At that, ore ridges of the developed above located floor, saturated with enriched fine fractions, are combined with ore bodies, to axes of influence of discharge of which they are located closer. Ore zone distant from the outlet influence axis is drawn into the pure ore ellipsoid by forming a limiting layer of coarse ore at an angle to the ellipsoid dome and forming a fine ore guide channel. Adjacent ore bodies in flattening places are broken together with part of interlayer, forming local connecting channels of finely ground ore mass with leaving uncrushed part of interlayer between them. In case of bifurcation or local confluence of ore bodies between them, a boundary skew is formed at an angle of outflow of broken ore equal to 45 , where ϕ – angle of internal friction of broken ore. This ensures balance between ore flows of adjacent ore bodies and their branches. To optimize the external mining contour represented by mineralization wedging out, a boundary cutting bevel is formed at angle of 45 , the location of which is determined from the condition of break-even cutting.

EFFECT: reduction of losses and dilution at high efficiency of excavation.

1 cl, 3 dwg