METHOD OF BLASTING PRIMARY CHAMBER Russian patent published in 2015 - IPC F42D3/04 E21C41/16 

FIELD: mining.

SUBSTANCE: invention relates to the field of mining and can be used in the development of mineral deposits by underground method for working the primary chambers in the flat and steep deposits under conditions of increased rock pressure. The method comprises drilling single ascending wells with placing explosive charges in them, sequential blasting the single ascending wells and formation of boundaries of the compensation slits along the isobar line with the orientation of the convex part towards the main mass. Rows of fans of wells of convex shape in the primary chamber are located congruent to outcrops of the compensation slits at a distance equal to the line of the least resistance. The central row is located across the course of the ore deposit and drilled with underdrilling to contact of ore-rock. The remaining rows of fans of wells are drilled to contact of the ore body at the side of lying and hanging sides. Lastly, the rows of fans of wells are drilled on the border with the compensating slits. The explosive charges are placed in the wells with underdrilling, the rows of fans of wells are short-delay blasted into two opposing surfaces of outcrops of the primary chamber. Finally, the central row of fans of wells and those allied with it are exploded simultaneously.

EFFECT: invention enables to improve the safety and efficiency of blasting operations and to reduce the consumption of explosives for primary breaking.

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