Kajian Teknis Dampak Kegiatan Peledakan (Flyrock) Studi Kasus di PT Silva Andia Utama Kecamatan Batujajar, Kabupaten Bandung Barat, Provinsi Jawa Barat

Abstaract. Flyrock is one of the most hazardous impacts of blasting activities, posing a significant threat to the safety of workers and nearby communities around mining areas. This study aims to examine the influence of blasting geometry parameters—such as burden, spacing, stemming, powder factor, and explosive charge—on the throw distance of flyrock, as well as to compare actual field data with predicted results. Primary data were collected directly from the field, while secondary data were obtained from literature reviews and mining permit (IUP) maps.The analysis was carried out using multiple linear regression to identify the relationship between blasting parameters and flyrock distance, accompanied by normality testing and predictive model comparison.The results indicate that the actual flyrock distance ranged from 11.2 to 147.1 meters, with an average of 52.23 meters. The parameters of powder factor, stemming, burden, and spacing were found to have significant influence, with a coefficient of determination (R²) value of 0.825, indicating a strong model fit.Technical recommendations include adjusting the stemming length and explosive volume to effectively control flyrock and enhance operational safety.Abstract. Flyrock merupakan salah satu dampak berbahaya dari aktivitas peledakan yang dapat mengancam keselamatan pekerja dan masyarakat sekitar tambang. Penelitian ini bertujuan mengkaji pengaruh parameter geometri peledakan seperti burden, spacing, stemming, powder factor, dan isian bahan peledak terhadap jarak lemparan flyrock, serta membandingkan antara data aktual dan hasil prediksi. Data primer dikumpulkan dari lapangan, sedangkan data sekunder diperoleh dari literatur dan peta IUP. Analisis dilakukan menggunakan regresi linear berganda untuk mengetahui hubungan antara parameter peledakan dengan jarak flyrock, disertai uji normalitas dan perbandingan model prediksi. Hasil menunjukkan bahwa flyrock aktual berkisar antara 11,2–147,1 meter dengan rata-rata 52,23 meter. Parameter powder factor, stemming, burden, dan spacing memiliki pengaruh signifikan, dengan nilai R² sebesar 0,825. Rekomendasi teknis mencakup pengaturan ulang panjang stemming dan volume bahan peledak guna mengendalikan flyrock secara efektif.