“Analisis Ekonomis Sewa Atau Beli Alat Excavator Pada Kegiatan Produksi Bijih Timah PT Prima Timah Utama, Desa Cit, Kabupaten Bangka: Economic Analysis of Rent or Buy Excavator for Tin Production at PT Prima Timah Utama, Cit Village, Bangka Regency”. 2021. MINERAL 6 (2): 13-17. https://doi.org/10.33019/mineral.v6i2.3088.