DESIGN OF DRAINAGE SYSTEM STRATEGY FOR MEETING WATER REQUIREMENTS OF THE PROCESSING PLANT DURING DRY PERIODS AT PT XYZ

• Main Author: Arif Setyananda, M.
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86389
• Institution: Institut Teknologi Bandung

PT XYZ has made progress in it’s phase 1 mining plans through the expansion of pits, the enlargement of the tailings storage facility, and other modifications to the openings, which collectively indicate an increase in production. This advancement has altered the morphology of the mining area surrounding PT XYZ, impacting the quantity of water that needs to be managed. Additionally, the increase in production has led to a heightened demand for water at the processing plant in PT XYZ. To address this, a water demand analysis integrating water management across all facilities is required. The development plan for phase 1 of PT XYZ's mine, spanning from the first to the fifth year, includes areas such as Pit 5, sedimentation ponds, natural rainwater catchment ponds, and water storage facilities at the TSF. In managing water, each mining plan profile is integrated into two drainage system scenarios designed to evaluate the water reserve capacity to meet the processing plant’s requirements during dry periods. The first scenario features a drainage system without the addition of fresh makeup water, while the second scenario involves the addition of fresh makeup water sourced from sedimentation ponds and natural rainwater catchment ponds For water management at the mining front in Pit 5, which supports mining operations and serves as one of the options for supplying additional water to the processing plant, pumping of 38,016 m³/day to 45,273 m³/day to the sedimentation pond is conducted with a recommendation of the Multiflo 420 EXHV pump. The optimal sump volume is found to be between 39,229.1 m³ and 72,087.7 m³. As a result, the water reserve endurance for Scenarios 1 and 2 is 31-48 days and 66-77 days, respectively. By comparing the duration of water reserve endurance against dry period variations of a minimum of 7 days, an average of 27.4 days, and a maximum of 74 days, Scenario 2 is considered more effective and efficient in ensuring the sustainability of processing plant operations when compared to the duration of the dry period. The recommendation is to strengthen the water reserve strategy under extreme conditions.