ASSESSMENT OF PERFORMANCE OF HORIZONTAL DRAINS AND PIT LAKE FORMATION FOR ÇÖPLER GOLD MINE, ERZİNCAN-TURKEY

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2021-8-25

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Argunhan Atalay, Çidem

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The purpose of this study is to develop 2D and 3D numerical groundwater models to assess the efficacy of horizontal drains and the formation of pit lakes at two open pits (Main Pit and Manganese Pit) that have an interaction with each other in Çöpler Gold Mine in Erzincan, Turkey. 2D numerical model SEEP/W was used to determine the pore-water pressure distribution in two critical cross-sections which are in North–South and East–West direction. The efficacy of horizontal drains along two cross-sections in the open pit were evaluated by analyzing the re-distribution of pore-water pressure as a consequence of groundwater inflow rates before and after application of horizontal drains. On the other hand, 3D models in different years (2012 and 2018) were developed to predict the inflow rates and assess the pit lake formations with the help of the MODFLOW-SURFACT and a pit lake water balance spreadsheet model. 2D model results indicate that the horizontal drains increased groundwater inflow rates by only 15 and 37% for the East–West and North–South cross-sections, respectively. Additionally, the water content was found to be almost close to fully saturation state in the wall rock behind the slope faces even after the use of drains. Volumetric water contents range between 93% and 97% at the backward of slopes. 3D model results display negligible amounts of groundwater inflow to Main and Manganese Pits. On the other hand, groundwater outflow component from Manganese Pit is quite significant and shows constant increase to nearly 80 L/s. In the Main Pit, it takes 8 and 32 years to reach the elevation of 1095 m (interaction elevation between two pits) regarding to the different runoff area configurations. In the Manganese Pit, lake level stabilizes at the elevation of 970 m and 950 m for different runoff area configurations in 45 years.

Subject Keywords

Slope Stability, Pore Water Pressure Distribution, Horizontal Drains, Numerical Modeling, Pit Lake Formation

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https://hdl.handle.net/11511/92228

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ç. Argunhan Atalay, “ASSESSMENT OF PERFORMANCE OF HORIZONTAL DRAINS AND PIT LAKE FORMATION FOR ÇÖPLER GOLD MINE, ERZİNCAN-TURKEY,” Ph.D. - Doctoral Program, Middle East Technical University, 2021.