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 [Internet]. 2018 Aug. 15 [cited 2026 Apr. 13];4(2). Available from: https://www.journal.ubb.ac.id/index.php/promine/article/view/108