In mining, the greatest risks are rarely found in uncertainty alone—they are found in the capital decisions that eliminate flexibility before uncertainty has resolved. Designing Optionality Into Mining Projects presents a strategic framework for rethinking mine development, capital allocation, and project architecture under conditions of geological complexity, commodity volatility, and irreversible investment. Integrating geology, engineering, finance, organizational behavior, and strategic governance, this book challenges one of the industry’s most dangerous assumptions: that better forecasts alone create better projects. They do not. Across exploration, feasibility, plant design, financing, portfolio construction, and organizational governance, Andi Anriansyah demonstrates that the most resilient mining projects are not necessarily those built on the most optimistic models—but those architected to preserve flexibility when models prove incomplete. Through a multidisciplinary framework of technical optionality, phased capital release, modular design, adaptive cut-off strategy, financing flexibility, jurisdictional diversification, and institutional learning, this book offers a practical doctrine for surviving geological surprises, commodity downturns, and strategic miscalculation without unnecessary capital destruction. This is not a book about avoiding uncertainty. It is a book about designing capital systems that can survive it. For mining executives, geologists, engineers, project developers, boards, investors, government stakeholders, and strategic decision-makers, this work provides both a technical blueprint and an organizational philosophy for building projects that remain viable across the realities the future may actually deliver. Because in mining, the true question is rarely whether uncertainty exists. The real question is whether the project was designed to survive it.