This research paper presents a comprehensive study on the utilization of bamboo geogrid as a reinforcement material to enhance the stability of slopes and optimize land usage in opencast mine overburden dumps using Plaxis 3D. Key findings indicate that the factor of safety (FoS) increases with higher cohesion and internal friction angle, while it decreases with increasing dump height, slope inclination angle, and unit weight. Young's modulus and Poisson's ratio variations have minimal impact on FoS. It was established that reducing the spacing between bamboo geogrids from 20 to 10 m resulted in a notable increase in the factor of safety from 1.419 to 1.515. For FoS exceeding 1.5, the unreinforced mine waste dump could sustain a maximum slope angle of 37.5° and a maximum dump height of 66.96 m with benches. In contrast, the bamboo-geogrid-reinforced dump slope exhibited a maximum slope angle of 40° and a maximum dump height of 90 m with two benches and spacing of geogrid reinforcement at 10 m intervals. Moreover, the study found that bamboo-geogrid-reinforced waste dump slopes could accommodate 28% more waste material compared to their unreinforced counterparts. These findings have substantial implications for civil engineers engaged in the design of opencast mining overburden dump slopes worldwide.