“Optimalisasi Dan Produktivitas Alat Gali-Muat Dan Alat Angkut Pada Tambang Batu Granit PT Vitrama Properti Di Desa Air Mesu, Kecamatan Pangkalan Baru, Kabupaten Bangka Tengah: Optimization and Productivity of Excavator and Dump Truck in Granite Mining Activity of PT Vitrama Properti at Air Mesu Village, Pangkalan Baru Subdistrict, Central Bangka Regency”. MINERAL 2, no. 1 (January 29, 2020): 8–15. Accessed April 18, 2026. https://journal.ubb.ac.id/index.php/mineral/article/view/1541.