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In large open-pit coal mine projects, internal dump slope failure is a serious issue for industry. Slope failure affects haul roads, mine machinery, and miners' lives and hampers coal production operations. Dump slope failure events will not occur suddenly, and progressive displacement will occur in the slope before failure. Therefore, dump slope monitoring is essential for the safety of humans and machinery. Generally, the mine slope displacement is measured using a conventional survey approach. However, conventional surveys cannot measure minor changes in a large dump area. Therefore, massive dump displacement monitoring is a tedious task for surveyors. This study used the unmanned aerial vehicle (UAV) close-range photogrammetry survey to introduce an intelligent and reliable approach for dump change detection and displacement monitoring. A UAV close-range photogrammetry survey was conducted to collect RGB images, and dump surface point cloud data (PCD) were generated using the structure-from-motion (SfM) computing algorithm. The ground control points (GCPs) were also measured using a coordinate measurement survey for geo-reference points. For dump surface PCD and 3D reconstruction, the Pix-4D Mapper image processing tool was used. PCDs were generated for two months and used for dump slope surface change and displacement monitoring using the cloud-to-cloud (C2C) computing algorithm. The PCD was compared with the reference PCD, and the results of this investigation indicated minor and major changes on the dump slope and top surfaces. This approach is inexpensive and reliable for large dump slope change detection and displacement monitoring. [ABSTRACT FROM AUTHOR]

2D numerical modeling is used for the dump slope stability assessment. The 2D numerical modeling stability assessment results are not realistic for the actual geometry of the dump. This investigation aims to combine UAV and 3D numerical modeling approaches using realistic and entire dump slope stability estimation and showing the failure zone. 3D surface reconstruction to create a 3D numerical model for stability analysis. The finite difference and limit equilibrium methods are used for the dump slope stability analysis. Finally, 3D numerical modeling was used to assess slope stability under static and dynamic loading. Static, pseudo-static, and probability of failure were analyzed using the 3D limit equilibrium method. This study proposes an approach for dump slope stability analysis. The slope factor of safety is 1.25, and it shows a stable dump slope under static conditions. This study examines the dump failure zone and its probability of failure, which will be helpful for mining authorities to make decisions about the prevention and mitigation of failure. [ABSTRACT FROM AUTHOR]