A geotechnical study is a formal, documented technical investigation and analysis of the geotechnical conditions at a mine site or specific structure, compiled by qualified geotechnical engineers to inform engineering design, risk management, regulatory approvals, and financial investment decisions. In bauxite, gold, iron ore, and diamond mining projects, geotechnical studies are milestone deliverables at each stage of the project development cycle, from Scoping Study through Pre-Feasibility Study (PFS), Feasibility Study (FS), and detailed engineering. The depth, rigor, and cost of geotechnical studies escalate progressively as the project advances and more investigation data is collected. A geotechnical study typically encompasses a review and synthesis of existing geological and geotechnical data, a description and interpretation of geotechnical investigation results, a geomechanical characterization of the rock or soil mass, slope stability analyses, groundwater and hydrogeological assessments, recommendations for engineering design parameters, identification of geotechnical risks and uncertainties, and proposed mitigation measures. International codes of practice — including those referenced by ANCOLD, MAC, ICOLD, and national mining regulators — prescribe minimum standards for geotechnical studies supporting infrastructure such as tailings storage facilities and heap leach pads. In the context of mineral resource and ore reserve reporting, geotechnical studies must address the technical modifying factors related to ground conditions that affect the economic extraction of the resource. For large open pit iron ore and gold projects, the geotechnical study for the ultimate pit slope design may represent several years of investigation, laboratory testing, numerical modeling, and peer review before final design parameters are adopted.
