This review examines the use of In-Pit Disposal of Mine Tailings (IPDMT) as a sustainable mine closure strategy. The authors argue that advances in metallurgical technologies, increasing metal prices, and growing demand for critical minerals are making the reprocessing of historical tailings deposits increasingly attractive. Under this approach, reprocessed tailings can be returned to exhausted open pits, reducing reliance on conventional surface tailings storage facilities and supporting circular economy objectives. The paper evaluates the principal advantages and limitations of IPDMT and reviews the technical considerations required to achieve long-term closure performance. Key design elements include maintaining physical stability through pit slope management and tailings placement design, hydrological stability through water and seepage management, and geochemical stability through characterization of tailings and control of acid mine drainage risks. The authors conclude that IPDMT has the potential to reduce environmental footprints, closure costs, and long-term liabilities while providing a responsible alternative for tailings management. However, successful implementation requires rigorous evaluation of geotechnical, hydrogeological, and geochemical conditions and careful consideration of future resource sterilization and groundwater protection.