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 [Internet]. 2020 Jan. 29 [cited 2026 Apr. 18];2(1):8-15. Available from: https://journal.ubb.ac.id/index.php/mineral/article/view/1541