<p>Australia’s zircon sector reveals a broader strategic problem in critical mineral governance: upstream abundance does not automatically translate into downstream control. Although zircon is often treated as an industrial mineral, it sits at the front end of a value chain that leads to zirconium metal, nuclear cladding, advanced ceramics, and other dual use materials. The key bottleneck lies in the technically demanding separation of zirconium from hafnium, which concentrates value and capability in downstream processing hubs. This paper examines how Australian policy instruments can unintentionally reinforce that bottleneck. Using process tracing and value chain mapping across two case studies, it shows that investment screening, concessional finance, and export governance can operate in isolation, supporting project development while simultaneously channelling product, processing, and control offshore, often into China-centred processing networks. The problem is not one of isolated policy failure but of instrument incoherence: policy settings across the value chain are not systematically aligned with objectives of value capture, supply chain resilience, and reduced strategic dependence. The paper develops an instrument coherence framework to explain how these dynamics generate strategic leakage, and shows why this matters beyond zircon and Australia for resource-rich economies navigating concentrated refining systems under conditions of geopolitical fragmentation.</p>