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 downward ore bodies using chambers using directional breaking and delivery of ore by explosion. The method includes driving loading orts-entries, delivery and trench drifts, sublevel drilling orts, inclined drilling, drilling-ventilation drift, cut-out raise, formation of an outlet trench by breaking wells, formation of a slot by breaking wells on the raise. The chamber is divided into two sub-levels with the formation of a temporary ledge, which forms an additional ore receiving tank to the outlet trench. Breaking with delivery by explosion is carried out directed towards a plane inclined at an obtuse angle to the soil equal to 90°+γ, where γ is the angle of decline in the trajectory of the broken ore under the influence of gravity and air resistance. Upon reaching the critical span of the ceiling outcrop, a temporary supporting prism of the ore is formed at an obtuse angle to the lying side equal to 90°+γ. After mining the upper subfloor, directional breaking of the support prism is carried out at an angle of 90°+γ to the lying side. In this case, during drilling, contour wells are deepened into the rocks of the recumbent side, which prevents the chamber from being tightened. Lastly, directional breaking and explosion delivery of the ledge of the lower subfloor are carried out in the chamber.

EFFECT: ensuring an increase in ore extraction rates.

1 cl, 3 dwg