Drill⁃and⁃blast is the predominant method used in underground mining of metal mines, and blastingparameters are crucial to ensuring blasting performance. At the Songxian Shanjin underground mine, issues such asimproper stemming, unreasonable blasting parameters, short advance per round, and high blasting costs have been iden⁃tified. These problems reduce excavation efficiency and increase construction costs, adversely affecting the economicperformance of mining operations. In response, this study introduced plastic stemmed emulsion（Marisan）in the blastingoperations and conducted a series of systematic optimization tests. By improving stemming practices and refining blastingparameters in a targeted manner, the study achieved notable improvements: the advance per round increased by 0.3 m,blasthole utilization rate rose by 1.63 percentage points, unit electronic detonator consumption dropped by 0.25 percubicmeter, unit explosive consumption decreased by 0.72 kg/m³, and blastingmaterial costs were reduced by 8.23 yuan/m³.Additionally, thenumber of requiredblast holeswas reduced, further improvingdrilling efficiency andblasting effectiveness.These optimization measures not only enhanced the overall blasting performance but also significantly reduced costs,enabling high⁃quality excavation with significant practical engineering value.