24th World Mining Congress, Rio-De-Janeiro, Brezilya, 18 - 21 Ekim 2016, ss.357-366
Cost is the main concern for the mining industry. System aging and resource degradation are the main reasons for increasing operating costs in mining activities. Thus, it is necessary for mine management to pay attention in order to reduce operating costs through operation rationalization and continuous improvement. In this frame, reducing drilling costs must be the priority so as to help the sustainability of the mine because drilling operation is often a high-cost activity. The most important cost associated with drilling operations is drill bit consumption. This is mainly because the continuous contact between rock and bit rapidly decreases the bit performance, and requires replacement. Therefore, monitoring drill bit performance, which requires advanced technical expertise and high technology, and its optimization with mathematical models are required to maintain productivity and efficiency of this mining operation. This paper presents a model to determine the optimum drill bit changing time for rotary drilling operations. The full factorial experimental design method was used to analyze parameters and then the problem is formulated by mixed – integer programming to solve by CPLEX software. The results show that the approach is very promising and it can be used to determine the optimum replacement time of rotary blast hole drill bits while keeping bit costs minimized.