Putrawiyanta, I Putu. “Use of Void As a Post-Mining Lake at PT Kasongan Bumi Kencana Katingan Central Kalimantan Province”. PROMINE 8, no. 1 (July 13, 2020): 8-13. Accessed May 7, 2024. https://journal.ubb.ac.id/promine/article/view/1801.