Evidences of the influence of the detonation sequence in rock fragmentation by blasting – Part II

Abstract

This paper shows the work conducted at the Experimental Mine of the Research Center of Responsible Mining of the University of São Paulo, taking into account the theoretical issues presented in the first part of the article. The research was performed without changing the production cycle and without resorting to investments in new types of equipment: it has attempted to increase the productivity of the quarry, by lowering production costs and improving the quality of the product. Some Key Performance Indicators (KPIs) were established to monitor the results. A new blast design method, a more appropriate initiation sequence and some simple, inexpensive and effective solutions were identified and applied. The results show that the proper selection of delay timing can be of significant benefit to downstream processes as well as enhanced fragmentation itself.

Influence of blasting charges and delays on the energy consumption of mechanical crushing

“…The effects of timing on fragmentation have not been extensively studied for a long time, but have gained much importance in the last 30 years, and many researches address this aspect (Stagg, 1987;Sastry and Chandar, 2004;Katsabanis et al, 2006;Katsabanis et al, 2008;Kim, 2010;Cardu et al 2015a and b;Seccatore et al 2015b;Schimek et al, 2015). The result of the previous and current studies shows that the influence of the detonation sequence on fragmentation results deserves greater research effort.…”