Pengaruh Mineral Sekunder Sulfat Hasil Oksidasi Pirit Terhadap Nilai Total Sulfur Pada Batubara Formasi Haloq dan Serpih Karbonan Formasi Batuayau Cekungan Kutai Atas: Effect of Secondary Sulphate Mineral theresults of Oxidation Pyrite againt Value Total Sulfur In Coal Formation Haloq and carbonaceous shale Formation Batuayau On the Kutai Basin. PROMINE, [S. l.], v. 4, n. 2, 2018. DOI: 10.33019/promine.v4i2.108. Disponível em: https://www.journal.ubb.ac.id/index.php/promine/article/view/108. Acesso em: 19 jun. 2026.