Manuka Resources Limited Pre-Feasibility Study Validates 6.2Mt Probable Ore Reserve & Enhanced Silver Recovery—A JORC 2012-Compliant Deep Dive into Project Economics and Upgrade Plans
Thursday, July 10, 2025
at
9:44 am
This report details the comprehensive JORC Code methodology for Wonawinta/Mt Boppy. It outlines sampling, drilling, assay, bulk density and resource estimation techniques, along with mining assumptions, metallurgical recovery and environmental factors, supporting reserve conversions at pre‐feasibility accuracy (~±30%) and validated by extensive QA/QC and site visits.
Manuka Resources has released an extensive technical document detailing its recent evaluation and reporting of mineral resources and ore reserves at its Wonawinta deposit and Mt Boppy project. The report outlines detailed sampling techniques, quality‐control procedures and data validation measures used across various phases of drilling—from traditional reverse circulation and diamond drills to sonic sampling of the dump and stockpile areas. The company emphasizes that historical data from previous operators combined with new surveys, including high‐accuracy drone LIDAR, have been used to constrain volumes and grades.
Technical methodologies for resource estimation are explained in depth, including block modelling using Surpac software and kriging techniques that were adjusted to account for biases and the potential nugget effect of high‐grade intercepts. For example, for the Wonawinta in‐ground deposit, measured and indicated resources were converted into a Probable Ore Reserve estimate using a regularisation process that led to a reported ~2.5% silver metal loss. At Mt Boppy, similar rigorous approaches have been employed with distinct considerations for the unique blend of open pit material, stockpiles and rock dumps.
The announcement also provides detailed commentary on the underlying assumptions used in the estimation process. These include the application of cut-off grades—determined by economic factors such as government royalties, processing costs, average recoveries and current silver and gold prices—and mining recovery factors. The company’s analysis reflects a pre-feasibility study level of accuracy (approximately plus or minus 30%) and indicates confidence in the technical and economic viability of the project. The document also highlights that the resource classifications adhere to the latest JORC (2012) guidelines, ensuring that all material assumptions, from bulk density measurements to the management of deleterious elements in the ore, are thoroughly accounted for.
In addition to reporting the methodological rigour of its sampling and estimation processes, Manuka Resources has confirmed that all necessary approvals and infrastructure need to support both on-site processing and eventual mining are in place. The report stresses that while market conditions and commodity price fluctuations remain a factor, the transparent approach to resource estimation provides both a robust technical foundation and clarity regarding the future production potential of the projects.
Overall, the detailed release from Manuka Resources serves to reinforce the company’s technical credibility by offering full disclosure on its methodologies, quality assurance practices, and assumptions in the conversion of mineral resources to economic ore reserves. This comprehensive technical update provides valuable information for investors seeking transparency on the company’s exploration and reserve development activities.