This Feasibility Stage Project Management Discipline document offers valuable insights and guidance for developing a business case for new or expanding mining projects. Organized into three main sections, it initially covers project management, addressing implementation stage planning and project integration management. The second section focuses on capital estimating, emphasizing capital cost estimating. The final section, the business case, includes operating cost estimating with a focus on operating cost model development, the compilation and analysis of operating costs, optimizing the operating cost profile, risk and contingency planning, and operating cost escalation. Each section provides essential information with step-by-step guidelines to ensure a comprehensive feasibility study. This document is applicable to any type of mining project worldwide, reflecting the extensive global knowledge and expertise of leading industry professionals accumulated over many years.