METHOD OF MINING ORE BODIES Russian patent published in 2023 - IPC E21C41/22 

FIELD: mining industry.

SUBSTANCE: invention can be used in the mining of steeply dipping ore bodies of medium thickness. The method includes driving a delivery drift along a contour with a hanging side, loading orts, a trench drift in contact with a hanging side, sublevel drilling drifts, breaking in a clamped environment onto a cutting slot or a spent block with partial release of ore, mass release with end loading. The method differs in that at the end of the loading orts, trapezoidal outlet slits are formed at the angle of collapse of the stored ore until they meet with the slots of adjacent loading orts. To ensure uninterrupted release with self-liquidation by ore curtains, the front edge of the outlet slot is formed at 2-3° steeper than the collapse angle of the stored ore, and the width of the gap is taken to be one diameter of the standard piece larger than the “live” section of the flow zone. From the outlet slot of each loading ort, a face is formed in the form of a broken plane, mating at stable obtuse angles with the loading ort and the trench roadway. Moreover, the face is secured and reinforced preventively before the trench drift is excavated. Above the outlet slots by the amount of the burden charge with angular penetration into the rocks of the recumbent side, sections are passed through trench drifts by drilling horizontal holes to a depth equal to the length of the outlet slot and breaking into it together with the separating whole, without shipping the ore. The lower sublevel is drilled from the trench drift with three-level differentiation of drilling and blasting parameters for more complete involvement of “dead” zones in ore production. At the same time, above the outlet openings by drilling wells along a grid close to square with an optimal LLR value, it is achieved to obtain an increased size of ore with a lattice structure without increasing the yield of oversized materials. Between the outlet holes, by thickening the mesh to 0.8 LLR, it is achieved to obtain an average size of ore of a mixed structure, ensuring a high flow rate of ore. The massif above the loading orts is drilled with fans of holes with a distance between diverging ends reduced to 0.8 LLR and the finest crushing of ore is obtained without overgrinding. In this case, the ore receives a continuous structure in the zone of converging wells and a mixed structure in the rest of the volume. This solution causes the clean ore ellipsoid to expand above the outlets, accelerating and shifting the flow towards the hanging wall, increasing ore recovery rates.

EFFECT: ensuring a reduction in losses and dilution of ore, a reduction in the volume of cutting work, and maintenance-free service of the bottom.

1 cl, 4 dwg, 2 tbl