Magnetic Resources NL reveals improved metallurgical testwork results for its Lady Julie North 4 gold deposit, showcasing a simpler, more cost-effective processing method that enhances gold recovery.
- Gravity concentration plus regrind and cyanide leaching achieves 92% average gold recovery
- New process outperforms previous flotation and intensive leaching method
- Potential reduction in capital and operating costs by substituting flotation with gravity concentrator
- Testwork completed on seven metallurgical composites from LJN4 deposit
- Feasibility study already confirms Lady Julie as a high-margin undeveloped gold project
Metallurgical Breakthrough at Lady Julie North 4
Magnetic Resources NL has announced encouraging metallurgical testwork results from its 100% owned Lady Julie North 4 (LJN4) gold deposit in Western Australia's Eastern Goldfields. The recent tests demonstrate that a processing route centred on gravity concentration, followed by regrinding and cyanide leaching, can achieve an average gold recovery of 92.0%. This marks a modest but meaningful improvement over the previously tested flotation and intensive leaching method, which averaged 91.7% recovery.
Simplifying the Process, Cutting Costs
The significance of this development lies not just in the incremental recovery gain but in the potential operational and financial benefits. By substituting flotation and intensive leaching with an additional knelson gravity concentrator and regrind step, Magnetic Resources expects to reduce both capital expenditure (CAPEX) and operating expenditure (OPEX). This streamlined approach also promises to lower operational complexity, which can translate into reduced execution risk and improved project certainty.
Testwork was conducted on seven metallurgical composites representing different mineralisation types within the LJN4 deposit. The process involved gravity concentration, regrinding the carbon-in-leach (CIL) tails to 20 microns, and subsequent cyanide leaching under standard conditions. The mass pull from the knelson concentrator was comparable to flotation, confirming the viability of this alternative route.
Context Within a Robust Project Framework
These metallurgical results build on a strong foundation of exploration and development progress at Lady Julie. The project has been the subject of extensive drilling, resource upgrades, and feasibility studies, with the latest confirming it as one of Australia's highest margin undeveloped gold projects. Managing Director George Sakalidis highlighted that the optimisation work not only improves recoveries but also reduces costs and execution risks, enhancing the overall economics and operational certainty of the project.
Magnetic Resources plans further drilling at LJN4, including 14 diamond holes totalling 7,050 metres, alongside additional metallurgical testwork to refine processing parameters. The company’s ongoing commitment to advancing Lady Julie is underscored by recent milestones such as mining lease grants and resource expansions exceeding 2.24 million ounces of gold.
Looking Ahead
While these testwork results are promising, full-scale plant validation and updated economic modelling will be critical next steps to confirm the anticipated cost savings and operational benefits. Investors and analysts will be watching closely as Magnetic Resources integrates these findings into its feasibility studies and project development plans.
Bottom Line?
Magnetic Resources’ metallurgical advances at Lady Julie North 4 could redefine project economics and set the stage for streamlined gold production.
Questions in the middle?
- How will the new processing route impact the final capital and operating cost estimates in the updated feasibility study?
- What timelines are expected for completing further metallurgical validation and integrating results into project development?
- Could the simplified process influence the scalability or throughput capacity of the Lady Julie operation?