Sidiq, Hidayatullah, and Idra Pusvito. “Penentuan Pit Limit Penambangan Batubara Dengan Metode Lerchs-Grossmann Menggunakan 3DMine Software”. KURVATEK 1, no. 2 (May 23, 2017): 67-72. Accessed December 22, 2024. //journal.itny.ac.id/index.php/krvtk/article/view/245.