PERHITUNGAN CADANGAN BATUBARA DENGAN METODE CIRCULAR USGS 1983 DI PT. PACIFIC PRIMA COAL SITE LAMIN KAB. BERAU PROVINSI KALIMATAN TIMUR. Jurnal Geomine, [S. l.], v. 1, n. 01, p. 1–5, 2015. DOI: 10.33536/jg.v1i01.1292. Disponível em: https://jurnal.fti.umi.ac.id/index.php/JG/article/view/1292. Acesso em: 30 aug. 2025.