METHOD FOR MINING ORE BODIES Russian patent published in 2024 - IPC E21C41/22 

FIELD: mining industry.

SUBSTANCE: used in the mining of ore bodies by systems with caving and end release through a slot, preferably in conditions of gently sloping or pinching mineralization. The method of mining ore bodies using double columns of a hexagonal shape in the longitudinal section, and in a cross section close to a rectangular shape, includes driving external and internal exhaust workings, lower and upper sublevel drilling workings, drilling out the columns with drill rings, forming the lower end bevels of the columns by mining layers, inclined at an angle of 45°-ϕ/2, whereϕ is the angle of internal friction of broken ore, breaking of columns together with the formation of upper corner bevels in the next pair of columns. In the middle of the columns, by thinning the wells, longitudinal zones of coarse ore are formed, expanding upward, and in the lateral parts of the columns, zones of light ore, which contributes to the expansion of ellipsoids of pure ore. The ends of the outlet workings are widened and outlet slots are formed, leaving cantilever projections above the outlet workings. Mass drawing of ore from the hexagonal parts of the columns is carried out through stationary outlet slots. After this, the remaining cantilever protrusions are worked out in inclined layers together with the angular bevels of the next pair of columns. The external exhaust working is shifted towards the collapsed rocks of the waste column by the amount of lateral movement of the ore due to loosening. The cantilever protrusion is given a stable concave shape. The outlet slot is formed starting from the axis of the column towards the collapse, while its edges are given a curvilinear shape with a curvature that mirrors the perimeter of the undeformed ellipsoid of pure ore. In the outer part of the column bordering the collapsed rock, above the lower drilling, a transverse zone of coarse ore is formed, which serves as an accumulator and conductor of rich fine fractions of ore, and for the uninterrupted flow of ore and bifurcation of the flow, this zone is formed with bevels at the base.

EFFECT: reducing losses and dilution of ore.

1 cl, 3 dwg