FIELD: mining industry. SUBSTANCE: drilled in rock mass within ore body are holes. Holes are charged with explosive material, electric firing circuit is wider, or circuit from detonating cord and pyrotechnic retarder is formed so that sequence of short-delay hole blasting proceeds from center of ore body to its periphery. Delay time is determined by offered expression depending on physical-technical properties of rock mass, parameters of drilling and blasting operations and rock pressure. The aim is achieved due to consideration of physical processes of shifting and deformation of fissured rock mass under the action of quasi-static pressure of detonation products. EFFECT: higher efficiency of preparation of rock mass by increasing permeability of ore body and setting up impervious curtain beyond the contour of ore body. 1 dwg
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