“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, vol. 2, no. 1, Jan. 2020, pp. 8-15, https://doi.org/10.33019/mineral.v2i1.1541.