Abstract: The landslide is a frequent geological hazards in the open pit mines die to the high and steep excavation slopes as well as the vibrations induced by the blasting. The debris from the landslide are usually consisted of a wide range of grain sizes and loose materials. As a result, the stability of the debris from the landslide area is usually very poor and the remediation of these loosely piled debris is necessary for a safe operation of the mining. This paper presents a case history of the evaluation and mitigation of a failed open pit mine slope. Site investigations were performed to characterize the subsurface conditions as well as to obtain the analytical parameters. Threedimensional laser scanning technology was used to precisely obtaining the topographical information of the sliding body. Three dimension numerical slope stability analysis was performed by using the commercial software FLAC3D. It was concluded that the targeted body was unstable and the remediation is required. The mitigation scheme included flattening unloading the slope. The remediated slope was evaluated and a satisfactory result was obtained.

Key words: Three-Dimensional Laser Scanning, Slope Stability Analysis, Slope Remediation