METHOD OF BLASTING OF MINERAL RESOURCES Russian patent published in 1998 - IPC

FIELD: mining industry, applicable for blasting of rock mass by deep-hole and chamber explosive charges. SUBSTANCE: in the known method involving formation of loosening cavities with cross sections in the form of isosceles triangles with the vertex facing the rock mass, drilling of deep holes, sinking of entries, charging of holes and entries, their blasting in a definite sequence, deep holes are drilled for creation of loosening cavities in rows parallel to the front of blasting and lateral surface of the loosening cavity, and they are blasted in the first place in a short delay, and entries are arranged between the cavities in the point of intersection of the line passing through the hole charges, located in the last row for creation of loosening cavities and parallel to the front of blasting with the bisector of the angle formed between the lateral surface of the loosening cavity and the plane of exposure existing or newly formed in the process of blasting; the angle between the lateral surface of the loosening cavity and the plane of exposure is determined by formula: α = 180^°+β/2, where: β - angle between lateral surfaces of loosening cavity, deg. EFFECT: enhanced efficiency, reduced cost of blasting enhanced quality. 1 dwg