- 01Waihi tests show ~97% gold recovery.
- 02Two composites: saprock and fresh rock.
- 03Low reagents; gravity+cyanide leach.
- 04Supports unified Monument processing plan.
Verity Resources (ASX: VRL) has reported consistent gold recoveries of up to 96.99% in metallurgical testing of samples from the Waihi deposit within its Monument project in Western Australia.
Recorded from samples of weathered saprock and fresh rock, the results were generated from the same testing conditions used for the neighbouring Korong deposit.
This included testing conditions, the methodology applied for sample selection, and the laboratory used for analysis.
Testing was designed to understand gold recoveries and reagent consumption, with the results expected to de-risk Monument’s mine development pathway and build confidence in unified conventional processing for both deposits.
Located in WA’s Laverton gold district, the Monument project has a current resource estimate of 2.5 million tonnes at 1.72 grams per tonne gold for 137,700 ounces (66koz Indicated + 72koz Inferred) at the Korong and Waihi deposits
High Recovery Rates
Verity tested two composite samples representing the principal weathered saprock and fresh rock geological domains at Waihi.
Each was diluted with one metre of immediately adjacent waste to simulate likely open-pit mining dilutions.
Gravity separation was followed by cyanide leaching under controlled conditions and both samples returned recoveries approaching 97% at a 24-hour leach time, with longer leach times returning incrementally greater results.
Reagent consumption was low across both composites, with cyanide recorded at 0.51 kilograms per tonne and 0.62kg/t and lime at 1.45kg/t and 0.50kg/t for saprock and fresh composites respectively.
The company reported a similarity in recovery profiles at Korong — which averaged 92.75% across four domain composites — and Waihi (97% across two composites).
Metallurgical Quality Validated
Director Patrick Volpe said the Waihi results validated the overall metallurgical quality of the Monument project.
“Both composites—one representing ‘oxide’ and one representing fresh rock—delivered recoveries consistent with the strong results we observed at Korong,” he said.
“The low reagent consumption across both composites and meaningful gravity recovery component further support a straightforward, low-cost conventional gravity-plus-cyanide-leach flowsheet.”
“The similarity in recovery profiles across both deposits strengthens our conviction in a single, unified processing strategy for Monument, [and] we now have a compelling metallurgical dataset across the entire resource that underpins our pathway toward technical studies and ultimately mine development.”
Verity will now undertake advanced metallurgical testing including comminution work as part of more detailed mining studies.
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