Abstract
Open pit mining of the phosphate deposit in the Meknassy Basin, particularly in Jebel Jebbeus, requires slope design and stability analysis to maintain security and profitability. These processes depend on the geological and geomechanical characteristics of the open pit mine area. Therefore, to identify these characteristics, several studies (geological, structural, geotechnical) were carried out using field surveys and laboratory tests. Two ultimate slope designs were developed based on the characteristics of the geological materials in the area. One slope cut will be performed in the marl, and another will be made in the rock mass. The application of kinematic methods identified two potential failure modes in the rock slope: planar and wedge failures. The maximum slope safety angle in the carbonates is 70°. The stability analysis using the limit equilibrium method indicates that the 42-m-high slope in the marl is stable with a 25° slope angle and that the 70-m high slope in the rock mass is stable with a 70° slope angle.
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