METHOD FOR CHARGING OF DEEP HOLES Russian patent published in 2004 - IPC

FIELD: mining art, applicable in open mining operations at open pit mining of mineral resources.

SUBSTANCE: the method for charging of holes by emulsion explosive, sensitized by the method of gas generation consists in preparation of emulsion explosive in a mixing-charging machine and introduction of a gas-generating agent in the emulsion matrix. Then the hole is charges with the emulsion explosive with the use of water tamping. Before the blasting preliminary set is the charge detonation critical diameter, which is taken to be equal at least to 0.5 of the hole diameter. Then, according to the empirical dependence, the relative density of the explosive charge is determined, corresponding to the mentioned critical diameter of charge detonation of the given explosive, and on the basis of the obtains data, variation of the explosive density is calculated according to the hole depth depending on the height of the water tamping column and the initial density of the explosive. At charging of the hole the emulsion explosive is sensitized by the mentioned of gas generation to a density, at which the explosive density lower than the critical density for the given diameter of the hole is maintained in the bottom part of the hole to be charges.

EFFECT: enhanced capacity of drilling and blasting operations due to the use of deep holes charged with the use of mechanized charging installations.