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 2018, 4 (2). https://doi.org/10.33019/promine.v4i2.108.