RAMDANI, R. R. Efisiensi dan Biaya Operasional Excavator Hitachi EX 8000-6 di Industri Pertambangan. Natural Resources And Enviromental Management, [S. l.], v. 3, n. 1, 2025. Disponível em: https://ejurnal.unikarta.ac.id/index.php/nrem/article/view/1821. Acesso em: 1 jul. 2025.