Abstarct: Blasting, as one of the fundamental operations in mining, may lead to adverse consequences such as flyrock, ground and air vibrations, and back-break in the absence of proper design and control. Accurate identification and analysis of the factors influencing these phenomena are of paramount importance. In this regard, the application of numerical methods, owing to their capability of simulating various conditions, high computational efficiency, and cost-effectiveness, is considered an effective and reliable alternative to field trials. In the present study, a numerical model was developed using PFC3D software to investigate the influence of controllable parameters—including stemming length, burden and spacing, distance of the first row of blastholes from the bench crest, specific charge, and delay timing—on bench blasting performance. The Dashte-Deh Sharghi mine, located in Yazd Province, was selected as the case study. Model validation was conducted baxsed on the results of single-hole test blasts in conglomerate rock. The simulation results indicate that a 20% reduction in stemming length increases flyrock by 16% and decreases back-break by 5%, whereas a 20% increase in stemming reduces flyrock by 18% and increases back-break by approximately 8.7%. Modeling of burden and spacing revealed that a 10% reduction in these parameters results in a 22% increase in flyrock and a 10% reduction in back-break, while a 10% increase leads to a 4% reduction in flyrock and a 2% increase in back-break. With a constant burden and an increase in spacing by 20%, 30%, and 50%, flyrock increased by 4%, 12%, and 20%, respectively, while back-break increased by 4.5%, 17.5%, and 30%, respectively. In addition, muckpile fragmentation uniformity significantly decreased with increased spacing. Another investigated parameter was the distance of the first row of blastholes from the bench crest. A reduction of 10% and 20% in this distance resulted in a 20% and 36% increase in flyrock, respectively, accompanied by a 15% and 7% reduction in back-break. Specific charge was also examined as a controllable parameter. A 20% increase in specific charge raised flyrock by 10% and back-break by 5%, while a 20% decrease in specific charge reduced flyrock by 16% and back-break by 8%. Finally, the analysis of delay timing demonstrated that longer delays reduce both flyrock and back-break while significantly improving muckpile distribution. baxsed on the results, the relative influence of controllable blasting parameters on flyrock, in descending order, is: distance of the first row of blastholes from the bench crest, burden and spacing, stemming length, specific charge, and delay timing. Similarly, the order of influence on back-break is: distance of the first row of blastholes from the bench crest, burden and spacing, delay timing, stemming length, and specific charge.