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The article gives the results of experimental explosions of a flat explosives system in the conditions of the Kyshtym underground mine. The main task here was to reduce the outcome of the overgrinding quartz fraction -20 mm. The design of the dispersed hole-explosive without any inert filler in air gaps was proposed and tested. The granulometric composition of the ore being broken off by various explosives structures was compared. The dependence of the output of quartz fractions on the specificdoi:10.25635/2313-1586.2018.01.014 fatcat:mty3jdqzcjbdley6yutuafzgye