An application of GIS for drainage controls against fast change of landform: A case study at Pasir open-pit coal mine, Indonesia

Category Engineering Geology
Group GSI.IR
Location International Geological Congress,oslo 2008
Author Choi, Yosoon۱; Park, Hyeong-Dong۱; Sunwoo, Choon۲
Holding Date 07 October 2008

Bench slope erosion and flooding of the pit are typical problems which need proper drainage controls in open-pit mines at humid region where surface drainage pattern is dominated by the fast change of landform due to mining operation. In this study, we present an effective and convenient method to find rational solutions about these problems using Geographic Information Systems (GIS). The Pasir open-pit coal mine in Indonesia was selected as a study area, and a detailed topographical survey was performed to generate a reliable Digital Elevation Model (DEM). By using GIS, faster, less subjective and more reproducible information about hydrological characteristic of drainage system could be analyzed and extracted from DEM. Based on the results from drainage analysis, raster-based spatial analysis was carried out to identify the bench slopes with concentrated drainage flow, and to calculate the ratio between the amount of incoming drainage and the size of ponds in the pit. As a result, we could quickly identify problematic bench slopes that have higher priorities for surface protection, and could propose an optimal design for pump allocation to prevent the flooding with a fast changing landform.