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The article is aimed at developing a technology for mining valuable ores with maximum preservation of natural contacts of ore zones with empty rocks and reduction of mixing of the rock mass during explosive loosening. A new method for working out local areas of mineralization in strong rocks using explosive loosening of rocks in the conditions of natural "clamping" by a natural array with decelerations between successive bursts of borehole charges above 300 MS is proposed. This allows you to achieve a minimum displacement of the exploded rock mass in both horizontal and vertical directions without any additional costs.

A mathematical model of transformable gas permeable blasting shelter made from worn out tires of heavy trucks bound together with chains, ropes or cables is proposed. Large displacements and unilateral constraints are specific features of this model. An algorithm was developed to calculate the displacements of tires and internal forces in connecting elements of blasting shelter subjected to dynamic loading. The results of the numerical simulation of simple shelter are presented for assessment of the adequacy of the mathematical model. This algorithm can be used to determine the parameters of shelter such as mass, number of tires, diameter of connecting elements which ensure its safe operation under any sequence of explosions.