Antipa Minerals (ASX:AZY) has reported Prefeasibility Study (PFS) metallurgical test work has confirmed the Minyari Dome Gold-Copper Project is amenable to conventional gold-copper processing.
The test work, completed by Strategic Metallurgy, returned strong gold recoveries of 89% to 98% across oxide, transitional, and primary material types.
Rapid leach kinetics were also demonstrated across all material types, with effective leaching achieved within 24 hours for oxide and transitional materials and 24–36 hours for primary material.
Primary material was confirmed as free milling and non-refractory, supporting a conventional carbon-in-leach (CIL) gold doré production pathway. Flotation of primary material CIL residue produced a separate commercial-grade copper concentrate, grading at approximately 22% copper.
The company says reagent consumption was low across all material types, with cyanide usage averaging 0.24kg per tonne and lime consumption ranging from 0.61kg/t to 4.24kg/t, depending on material type.
Geotechnical work supports steeper overall open-pit slope angles for the transitional and primary mineralisation zones than those used in the Scoping Study.
The revised parameters support evaluation of deeper open-pit mining as part of the PFS mine planning and optimisation process, with potential to reduce the strip ratio and reduce or remove reliance on underground mining in the development schedule.
Metallurgical test work confirms strong recoveries
“The outcomes reported today strongly reaffirm the potential of the Minyari development, delivering results that meet or exceed those from the Scoping Study and provide a clearer view of the project’s optimal processing and development pathway,” Managing Director Roger Mason says.
“PFS-level metallurgical test work has confirmed that Minyari mineralisation is amenable to a conventional processing flowsheet, delivering strong gold recoveries alongside the potential to produce both gold doré and a separate commercial-grade copper concentrate.”
The updated geotechnical parameters support steeper open-pit slope angles in the transitional and primary domains.
Updated overall slope angles include oxide at 31° (Scoping Study: 37°), transitional at 41.2° (Scoping Study: 37°), and primary at 51.3° down to 250m below surface (Scoping Study: 50°).
The PFS geotechnical program comprised 32 diamond drill holes for 6,919m, including open-pit wall drilling, logging, sampling, laboratory testing, structural analysis, and stability modelling.
Antipa Minerals expects to complete the technical PFS workstreams in the third quarter of this year, with the release of PFS outcomes shortly thereafter.
Definitive Feasibility Study-level activities have commenced and are progressing as planned, the company notes.
The company will be attending the Noosa Mining Conference, held on 22–24 July 2026 at Peppers Noosa Resort, Noosa Heads, Queensland.
Mining.com.au is an official media partner of this year’s conference and will be at the event.
Write to JC Villarba at Mining.com.au
Images: Antipa Minerals
