QUALITY PREDICTION AND SIMULATION OF WATER MANAGEMENT IN THE POST-MINING PHASE AT COPPERGOLD MINE PT XYZ

• Main Author: Meilia Zahra, Rizka
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86349
• Institution: Institut Teknologi Bandung

Mining activities at PT XYZ will conclude in 2033, transitioning into post-mining plans. At the end of operations, remnants of mining will still include mine openings and material piles that could potentially generate acid mine drainage due to leaching from acid-containing rocks. Acid mine drainage can cause pollution to the environment, so it is necessary to predict the water quality expected in 2033 based on PT XYZ's post-mining drainage scenario. The study aims to review changes in water quality at each critical point in the drainage system, predict post-mining water quality and develop a management plan. The results indicate that water quality changes occur at each critical point based on PT XYZ's post-mining drainage scenarios, with pH ranges of 3.78 to 3.89 at Santong and 4.06 to 4.21 at Tongoloka. Water will accumulate in Santong Pond, with predicted water quality showing a pH of 3.89 and a Cu concentration of 7.10 mg/L, while Tongoloka Pond will have a pH of 4.21. Both ponds do not meet environmental quality standards. The water management scheme employing active treatment with CaO as a neutralizing agent can increase the pH to between 6 and 7 in both ponds, where Cu concentrations decrease to below 2 mg/L in Santong Pond. The management of acid mine drainage at PT XYZ using active treatment with CaO is effective in improving pH levels and reducing dissolved Cu concentrations, thereby meeting environmental quality standards.