Estimating the Formation of Acid Mine Drainage in Open-Pit Coal Mining Operations

"Acid Mine Drainage (AMD)" is one of the major environmental and health issues facing the mining industry. This research focused on evaluating the potential for acid formation in coal mining operations located in Separi, Kutai Kartanegara, East Kalimantan. The study included acid-forming potential tests conducted on core rock layer samples. 24 core rock sample units were collected for ABA and NAG testing. The sample test results using acid-base counting showed that there were 11 samples being potential to produce acid with high capacity, 7 samples produced acid being in a low capacity, and the amount of production varied. The alignment between the results of the acid-forming potential tests confirmed their reliability as effective methods for the preliminary assessment of potential Acid in mining operations across Kalimantan.