METHOD FOR FORMATION OF EXPLOSIVE CHARGE IN ENTRY FOR ORE-BREAKING Russian patent published in 2001 - IPC

FIELD: mining art, in particular methods for formation of explosive charge at underground mining of high-power deposits for "mine" ore-breaking with level and sub-level caving. SUBSTANCE: the method for formation of explosive charge in the entry for ore-breaking consists in cutting of the entry by blast hole drilling, leaving of the broken ore at the entrance of his entry, and use of it as a stemming, loading of the cavity of the entry with an explosive charge through the hole of the workings of the above-laying horizon, according to the design, the entry is cut by the method of successive sectional blast of dispersed explosive charges in a set of holes drilled on route of the entry with establishing of a pillar in the upper part of the entry with unblasted ends of the holes of the last section. After the discharge of the broken ore to the boundary of tamping, mine survey of the obtained contour of the entry is carried out, using the unblasted ends of the holes of the last section in the pillar. According to the results of the mine survey, determined are the actually obtained sections of the entry at various heights, and according to them - the lines of the minimum resistance. Then, using these data, calculated are the quantities of the required dispersed explosive charges in the height of the entry and the depth of their location. Then, placement of each charge is accomplished, with the live primer placed in it, through the unblasted ends of the holes of the last section in the pillar, and the gaps between these explosive charges are filled with inert material, and the line for blasting the live primers is laid through them. EFFECT: reduced labor content in formation of the explosive charge, and enhanced quality of ore breaking. 2 dwg