Supriyadi et al. 2026. OPTIMASI PIT TAMBANG TERBUKA BATUBARA MENGGUNAKAN METODE LERCHS-GROSSMANN: OPEN-PIT COAL MINE OPTIMIZATION USING THE LERCHS-GROSSMANN METHOD. JURNAL TEKNIK PERTAMBANGAN. 26, 2 (Aug. 2026), 52–60. DOI:https://doi.org/10.36873/jtp.v26i2.26761.