6. DISCUSSION The results obtained in this case study illustrate a broader shift in haul road engineering within large-scale mining operations: from thickness-driven design toward performance-oriented stabilization. In many mining environments, weak subgrades are traditionally addressed by increasing granular thickness, resulting in substantial material movement and recurrent reconstruction cycles. While such approaches may temporarily restore trafficability, they often treat deformation as a consequence to be compensated rather than a mechanism to be controlled. The reinforced configuration implemented in this study demonstrates that improving confinement and load distribution can modify the structural behavior of the system without proportional increases in material mass. From a systems perspective, haul roads should be regarded as production-critical infrastructure rather than consumable earthworks. When degradation directly affects truck speed, fuel consumption, and maintenance frequency, road performance becomes a limiting factor in mineral delivery. Integrating mechanical stabilization with operational monitoring—such as vehicle-based load exceedance data—creates the opportunity to manage haul roads using performance indicators rather than reactive grading schedules. The scalability of the solution is supported by its compatibility with existing mining equipment and construction practices. Because implementation does not require specialized paving technology, the method can be deployed selectively in high-impact segments, including ramps, curves, and recurrent maintenance zones. This targeted strategy allows operations to prioritize interventions where improvements translate directly into productivity gains. However, successful application depends on appropriate material selection and drainage control. Mechanical stabilization enhances performance but does not replace the need for adequate surface water management or minimum granular quality. Site-specific evaluation remains necessary to define layer thickness and reinforcement positioning. Ultimately, the findings suggest that mechanical stabilization can contribute to a more resource-efficient model of infrastructure development in mining. By reducing material intensity while maintaining structural performance, the approach supports both operational resilience and lower environmental impact, aligning with the industry's transition toward more efficient and responsible mineral production. CONCLUSIONS AND IMPLICATIONS FOR INDUSTRY This study demonstrated that the application of multidirectional rigid geogrids significantly improved the structural and operational performance of a heavy-duty mining haul road. By transitioning from a conventional thickness-based structure of approximately 2.0 m to a mechanically stabilized configuration of approximately 1.2 m, the reinforced solution reduced total structural thickness by about 40% while maintaining trafficability over weak subgrades. Operational monitoring confirmed reduced surface deformation and improved resilience during rainfall events, contributing to a measurable decrease in unproductive hours associated with road conditions. These results indicate that haul road degradation
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