METHOD OF FORMATION OF SHORT COMBINED STEMMING OF BLAST HOLES WITH STONE MATERIAL AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2015 - IPC F42D1/08 

FIELD: mining.

SUBSTANCE: method of formation of short combined stemming of blast holes includes the formation of the lower fill part by inert fine materials with the height of 1.0-1.5 of the well diameter above the air interval and formation on it of the upper part - a layer of stone material elements, to the height 0.5-1.5 of the well diameters, for this purpose on the lower fill part the transport container with stone material elements with the size 0.2-0.7 of the well diameter is lowered, then it is unloaded and removed from the well. The process of formation of layers is repeated until full formation of the combined stemming with the height no more than 10 well diameters. For stemming formation the transport container implemented in the form of the metal or plastic cylinder with the top ring with the size 0.8-0.9 of the well diameter, fitted with the bearing cord. Bars with the step excluding penetration of small pieces of stone material between them are evenly fixed in the top ring. On the transport container the soft bag with the length 40-50% larger than the length of the transport container with the bearing dual cord is fixed.

EFFECT: improvement of efficiency of locking of detonation products in a charging cavity by the short combined stemming.

2 cl, 4 dwg