Scholars of mining policies are beginning to understand how the most recent boom in commodity prices (2000–2014) influenced the institutional development of the mining sector in Latin America. We contribute to this literature by studying the design, dynamics, and outcomes of interorganizational coordination in Colombia and Ecuador. Our findings show that, despite their divergent policies, both countries failed to integrate the mining sector's three main policy games—formalizing artisan and small‐scale operations, increasing the number of large‐scale projects, and tackling illegal extraction. Several characteristics of the design of coordination initiatives influenced policy failure—the reliance on hierarchy mechanisms to motivate coordination, the lack of specificity of the coordination mandates, and the lack of specific resources for coordination. Contextual factors also shaped the dynamics and outcomes of coordination. The limited geographical spread of artisanal and small‐scale mining and of illegal extraction, the environmental sector's weakness, and the creation of a multilayered structure for public‐sector coordination contributed to policy effectiveness in Ecuador. On the other hand, the ample spread of artisanal and small‐scale mining and of illegal extraction, the lack of a clear coordinating structure, and the environmental sector's growing vigor contributed to sustained policy failure in Colombia.