METHOD OF DUST SUPPRESSION DURING BLASTING WORKS IN PITS Russian patent published in 2014 - IPC E21F5/02 

FIELD: blasting.

SUBSTANCE: method includes stages, at which they fill each well with an explosive charge and place a tight shell with water on the surface of the exploded block near head of each well. At the same time the tight shell with water is placed in a hollow cylinder installed above the well head. Besides, the diameter of the cylinder is comparable with the well diameter, and height is selected depending on the necessary volume of the tight shell.

EFFECT: increased efficiency of dust suppression and increased efficiency factor of explosive energy during mass blasting of wells at pits.