Abstract
Development operation in underground mining require high performance drilling and blasting. In order to determine best performing cut in Lece mine series of experiments were conducted. It was noticed that sequencing of initiation has crucial impact on cut performance. Line cut had experienced filling of empty holes with blasted material that was indistinguishable from the main rock. Finally, best results were obtained by delayed initiation of charges in circular pattern. Such cut construction provided complete hole recovery instead of previous poor results.
Highlights
Underground mining methods used in Lece mine require increased amount of development openings such as drifts and ramps
It was clear that main problem is the removal of the blasted material from the cut and it implied further experiment where explosive charges were initiated in circular pattern with delay between them, Figure 5 and 6
Inappropriate blasting and technological discipline may lead into bad development operations and increased costs of such work
Summary
Underground mining methods used in Lece mine require increased amount of development openings such as drifts and ramps. Due to inadequate application of underground mining methods and mine design almost half of ore quantity is excavated through development in some months. Technical reports on blasting efficiency provided information that after blasting effective advance was 1.35m, while 0.25m of the blasthole was wasted. On the location RZ-43-80L during the same period there was 30 blasts while total advance was 35.5m which gives 1.18m per blast. Damage of surrounding rock mass due to improper blasting is one of the problems that needs to be taken care of since it may provide instabilities (Torbica & Lapčević, 2016; Torbica & Lapčević, 2015; Torbica & Lapčević, 2018) and higher quantity of materials to be handled. Previous works on blasting optimization in Lece mine were considering ring blasts and is available in (Duranović, et al, 2018)
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