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sublevel stoping drilling

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Economic Comparison of Drilling Systems in Sublevel Stoping Method KAZEM ORAEE 1 and AMIR HOUSSAIN BANGIAN* 2  Drilling constitutes an important part of the production process in sublevel stoping method and up to 50% of the total costs can be attributed to this element. With the advent of recently developed sophisticated and expensive drilling machines, sublevel stoping has gained renewed advantage over other similar methods. The use of these machines, however, substantially increases the capital cost of the whole operation and hence choosing the optimum drilling system can produce significant savings in costs. In this paper, drilling patterns have been designed for various conditions of the physical characteristics and geometrical conditions of an ore body. Total costs of some 150 different patterns have been compiled. Based on these empirical data, a practical model has been devised that determines drilling costs in all different feasible situations in sublevel stoping. The model shows that parallel drilling is the most efficient alternative in all workable conditions. As well the break-even orebody thickness in ring drilling between one or two production drifts in sublevels is, in most cases, about 30 meters. The prescribed drilling methods in different circumstances and the model introduced, can serve as useful tools to the mining design engineer in choosing the most economical drilling system when designing a stope. Keywords: Sublevel stoping, ring drilling, parallel drill ing, DTH drilling machines, drilling and blasting pattern, stope height 1. Introduction It is obvious that, ore extraction with the lowest cost rate is basically the most important point in mining decision making and production planning. Also in sublevel stoping method, which is one of the most useful hard-rock underground mining methods, it is possible to execute several production drilling systems depend on ore body's geometry and production planning with a wide range of different production costs. Therefore applying sublevel stoping method economically should be considered to compare viable production drilling as a fundamental requirement to select the best solution. In this paper with respect to the mentioned idea, firstly sublevel stoping method is described in brief, followed by economic comparison of different drilling systems. In the next stage the criteria of drilling systems of economic comparison is discussed. Consequently the procedure of economic comparison of drilling system in sublevel stoping method analyzed with respect to a wide range hypothesize production block designs, in different geometrical 1  Professor, Stirling University, UK, E-mail: [email protected]  2 PhD Student, Science and Research branch - Islamic Azad University, Iran, E-mail: [email protected]  

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