Lusitania, Lusitania, and Supardi Razak. “Studi Nilai Effective Utilization (EU) Terhadap Peningkatan Produksi Pengupasan Lapisan Tanah Penutup Tambang Batubara”. Mining Science And Technology Journal 4, no. 1 (May 18, 2025): 21-33. Accessed April 20, 2026. https://www.jurnal-unsultra.ac.id/index.php/minetech/article/view/923.