SIMULATION OF FILLING IN EX-MINE HOLE, PIT D2 SITE BINUNGAN 01 PT. BERAU COAL, EAST KALIMANTAN.

• Main Author: Wulandari, Diah
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/71187
• Institution: Institut Teknologi Bandung

Open pit mining creates former pits that can be used as post-mining lakes or are known as pit lakes. However, the filling of post-mining lakes with rainwater and river water is still rarely done in Indonesia. Therefore, predicting the formation of mining lakes by simulating the rate and duration of water filling with rainwater and river water can be one of the references or guidelines for reclamation of mining lakes in Indonesia. This study is conducted at Binungan 01 site of D2 pit, a mining area of PT. Berau Coal, which is located between two rivers, the Kelay River and the Binungan River. These two rivers have high water discharge, which is 930.60 m³/s to 1539.2 m³/s with a flow rate of 0.540 m/s (Kelay River) and 117.39 m³/s to 304.30 m³/s with a flow rate of 0.608 m/s (Binungan River). The filling simulation is carried out under two assumptions, namely continuous or throughout and the assumption of filling by flood discharge. The two simulations resulted in the conclusion that the Kelay River needs 18 months to fill the mining lake, assuming that the filling is continuous with a river discharge of 2 m³/s. In contrast, the filling simulation based on flood discharge requires 16 months to fill the lake at a discharge of 2.75 m³/s. The results of the Kelay River simulation are considered more effective, while the Binungan River takes 25 months to fill at a discharge of 1.5 m³/s assuming continuous flow, and 18 months to fill at a discharge of 1.85 m³/s assuming flood flow.