METHOD FOR CHARGING-IN OF DEEP-HOLE AND DESIGN OF DEEP-HOLE CHARGE Russian patent published in 2000 - IPC

FIELD: mining industry, in particular, methods for charging-in of deep-holes and design of deep-hole charge in fulfillment of blasting operations mainly in open pits. SUBSTANCE: components of a combination charge including emulsion and grain explosives are delivered to the deep-hole separately without agitation. For formation of a deep-hole charge in the form of emulsion and grain explosives concentrically arranged in the bore-hole the above explosive components are delivered to the mouth of the deep-hole simultaneously by means of a charging hole and trough of charging machines. For example, a mix of ammonium nitrate and diesel fuel (igdanit), or some other explosive main be used as grain explosive. Emulsion and grain explosives are placed in the bore-hole in the immediate contact with formation of an external shell in the form of a sleeve of grain explosive, accommodating the emulsion explosive. EFFECT: reduced labour content in charging-in of deep-holes, enhanced efficiency of blasting operations. 5 cl