GROUNDWATER MODELING USING FINITE ELEMENT METHOD TO ESTIMATE PASSIVE INFLOW IN KUCING LIAR MINE PT. FREEPORT INDONESIA

• Main Author: Hadi Ramadhan, Taufiq
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/85450
• Institution: Institut Teknologi Bandung

Kucing Liar is the future mine of PT Freeport Indonesia, which will start production in 2028 using the block caving mining method. It is located in the central mountains of Papua, which have high rainfall and complex geological structures. This condition results in a significant influence of passive inflow on mining operations at the extraction level. This study models the groundwater conditions at the Kucing Liar mine and estimates the passive inflow that entering the extraction level using a finite element method on Minedw software, using data comprimising rainfall, hydraulic conductivity, lithology, geological structure, water intercepts, and the planned caving zone model of the mine. The modeling result shows that as mining progresses, the initial southward flow direction changes towards the mine’s caving zone. The groundwater table decreases due to mining activities, and the passive inflow at Kucing Liar increases as the caving zone expands, starting from 2028 and drastically increasing on 2030 from 6 l/s to 74 l/s by the end of 2030 when the cave zone of Kucing Liar mine breaktrough the more transmissive zone at the contact of Waripi Formation and Skarn which modeled as Kucing Liar Upper zone on the Model. The passive inflow reaching its peak in the rainy season of 2040 at 397 l/s. By the end of the life of mine’s in early 2041, the passive inflow that enter Kucing Liar mine is 380 l/s.