METHOD TO OUTLINE MINES AND PILLARS IN CASE OF ROCK MASSIF BLASTING Russian patent published in 2013 - IPC F42D1/00 F42D3/04 

FIELD: mining.

SUBSTANCE: method includes drilling of outlining and parallel compensation blast holes in a strictly determined order. The distance between outlining blast holes along the perimeter of the secured massif shall be equal to r_”р” (not higher than this value). The distance between outlining blast holes and the contour of the secured massif shall be equal to r_”СМ” (not higher than this value). The distance between outlining and compensation blast holes shall be equal to r (not higher than this value). Compensation blast holes are arranged at the side of the secured contour at the angle formed between the axis of outlining blast holes and axes of compensation blast holes equal to 60°. The values r_”р”, r_”СМ”, and r are determined depending on strength characteristics of the massif and capacity of the used explosive.

EFFECT: invention makes it possible to increase efficiency and safety of these types of works due to optimal distribution of wells or boreholes along a contour of a secured massif for specific mining-geological and mining-technical conditions.

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