“Analisa Hasil Pencucian Bijih Timah Pada Harz Jig Dalam Menurunkan Kadar Timah (Sn) Pada Tailing Di PT Timah (Persero) Tbk. Unit Kundur, Kepulauan Riau: The Analysis of Tin Ore Leaching Products of Harz Jig In Reducing Tin Tailing Levels In Kundur Unit of Riau Archipelago”. PROMINE 4, no. 2 (August 15, 2018). Accessed April 13, 2026. https://www.journal.ubb.ac.id/index.php/promine/article/view/110.