Metallurgical Testwork28 Jul 2025 10:09
Metallurgical Testwork
Initial bottle roll tests on surface samples at the Project had indicated good gold recoveries from those samples from standard cyanide leaching. The Company today reports that more advanced mineralogical studies, on material from drill hole MBDD002, located within the dominantly fresh ore zone, has confirmed that the gold predominantly occurs as fine-grained tellurides (calaverite with lesser petzite). The mineralogy is therefore similar to that identified at the Company's Bibemi gold project, and therefore likely reflects a regional trend.
Diagnostic leaching test data indicates that 54.4% of the gold is recoverable via carbon-in leach processing, with an additional 12.4% (for a total of 66.8%) recoverable by hydrochloric acid ('HCl') leaching. Approximately 30% of the gold is strongly associated with the primary sulphide pyrite and is not amenable to standard cyanide leaching. As at Bibemi, it is expected that one processing option might be the oxidation of a flotation concentrate followed by cyanidation of the oxidised residue to achieve an acceptable gold recovery by negating the influence of telluride association and pyrite encapsulation. Further testwork, which will inform the optimal processing route from the various options available, is planned. This includes possible alternatives to pressure oxidation, such as other oxidation processes, e.g. the Albion process, as well as fine grinding of a flotation concentrate, more intensive cyanidation at high pH and a pre-leach treatment to dissolve tellurium ahead of gold leaching."
It's going to take the company a significant amount of time to demonstrate whether it is worth the investment to build a mine at Mbe or Bibemi
so I'd be surprised if there's much upside until there is far more clarity on the processing route and figures for CAPEX & OPEX