
Cobalt Blue completes core sampling at Halls Creek to test silver recovery, aiming to simplify development and improve capital efficiency. A$1.5m spend required by June 2028.
Cobalt Blue Holdings (ASX: COB) has completed a targeted core sampling program at the Halls Creek base metals project in Western Australia. The program aims to test silver recovery through the heap leach process, with the goal of simplifying the development pathway and improving capital efficiency.
The June 2025 scoping study only considered copper and zinc recovery from Stage 1. Silver recovery was not included. The new test work will establish achievable silver extraction performance and determine whether silver can be incorporated into the revised Stage 1 flowsheet.
The program has two workstreams. The first will optimise a heap leach flowsheet for the Onedin deposit, focusing on copper-zinc recovery, reagent performance, leach conditions, and downstream processing. The second will assess whether material from Onedin and the nearby Sandiego deposit can be treated through a single heap leach operation, with silver recovery as an additional value driver.
If test work supports this alternative configuration, the company expects to reduce development complexity and improve capital efficiency. The company sees the deposits as a foundation for a centralised processing facility that can accept future feed from satellite deposits and regional exploration targets.
CEO Dr Andrew Tong said the core sampling represents an important step in strengthening the Halls Creek development case. "The scoping study established a strong foundation for Halls Creek as a staged copper-zinc opportunity, and we are now focused on testing practical options to improve that development case," he said. "Our Broken Hill Technology Centre provides in-house metallurgical capabilities and flowsheet optimisation expertise. By using the extensive historical core available, we can progress this work efficiently and assess ways to unlock further value."
Cobalt Blue is working to boost its equity at Halls Creek to 75% by progressing a technical and commercial pathway. The company needs to spend a further A$1.5 million on the tenements by June 30, 2028.
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