Leaching Column Simulation of Acid Mine Drainage Potential from Overburden Rocks of the Sawahlunto Formation Ombilin Basin and Neutralization Study Using Vertical Passive System

Acid Mine Drainage (AMD) generation from overburden rocks in the Ombilin Basin, West Sumatra, is strongly influenced by their mineralogical composition. A study classified three overburden types—Kandi, Batu Tanjung, and Sikalang—as Non-Acid Forming (NAF), while Salak 1, Salak 2, and Salak 3 were identified as Potentially Acid Forming (PAF). Column leaching tests revealed significant variability in effluent pH and dissolved solids, with Salak 1 producing highly acidic effluent (pH 3.54) compared to NAF samples. Neutralization experiments using CaO and local limestones demonstrated effective AMD control, achieving calcium conversions up to 47.4%. These findings underscore the need for tailored passive neutralization systems in coal mining operations, with further optimization required for scalability.

Prabowo, H., Algifari, A., Nauli, F., Pratama, W., & Amini, A. (2025). LEACHING COLUMN SIMULATION OF ACID MINE DRAINAGE POTENTIAL FROM OVERBURDEN ROCKS OF THE SAWAHLUNTO FORMATION OMBILIN BASIN AND NEUTRALIZATION STUDY USING VERTICAL PASSIVE SYSTEM. Water Conservation & Management, 9(4), 01–13. https://doi.org/10.26480/wcm.04.2025.689.701