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Article history: Received 6 January, 2017 Accepted 9 April 2017 Available online 9 April 2017 Quality of blast preparation for rock beneficiation influences both on integrity of mineral stock in particular and in economical performances of enterprise operations in general. While rock processing for obtaining of crushed stone the yield of screenings is high, its amounts depend on rock strength properties. Investigation into the influence of drilling and blasting parameters on strength properties of blasted rocks is an urgent research and practical task for mining companies producing building stones. This article discusses results of full-scale experiment aimed at determination of strength of blasted rocks in shotpile with accounting for fracture zones as a function of rock massif saturation with energy of explosive substance. © 2017 Growing Science Ltd. All rights reserved.

Determination of rock mass weakening coefficient after blasting in various fracture zones