METHOD FOR CHARGING OF INUNDATED HOLES WITH HYDROLABILE GRANULATED EXPLOSIVES Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: method for charging of inundated holes with hydrolabile granulated explosives includes supply of compressed air to hole bottom, displacing water from hole and hole charging. Lowered to hole bottom is charging pipeline used, first, for supply of compressed air with pressure exceeding that of ground water to form air hollow on the hole bottom, then, explosives are supplied to the air hollow with compressed air at pressure exceeding ground water pressure. During supplying of explosives, the charging pipeline is withdrawn gradually from hole to form charge and to displace water out of hole. Upon completion of charge formation, water is left in hole in the capacity of stemming. EFFECT: higher efficiency. 2 cl, 1 dwg