RANCANGAN TEKNIS DESAIN PUSH BACK PENAMBANGAN BATUBARA PADA PIT 1A DI PT. NATA ENERGI RESOURSES JOB SITE PT. ATHA MARTH NAHA KRAMO, KABUPATEN MALINAU, PROPINSI KALIMANTAN UTARA. j.geologi.pertamb. [Internet]. 2017 Sep. 19 [cited 2025 Aug. 24];2(22):25-39. Available from: https://ejurnal.unikarta.ac.id/index.php/jgp/article/view/313