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