Freeman Gold's 2025 Phase 4 Metallurgical Testwork Reports >95% Extraction and Confirms Simple, Low-Risk Processing for Lemhi
Freeman Gold’s Phase 4 metallurgical program demonstrated impressive gold extraction results, consistently achieving between 91% and 97%, with an average exceeding 95%. These high recoveries across diverse ore samples indicate that the Lemhi deposit is highly amenable to conventional processing. High extraction results significantly strengthen the project's economic outlook because more gold can be recovered per tonne of ore.
Simple, Low-Risk Processing Flowsheet
The testwork confirms that the Lemhi ore can be processed using a simple CIL (Carbon-in-Leach) cyanidation circuit after a modest grind size of around 120 μm. No complex or experimental processing techniques are required, meaning the project avoids technological risk. Simplicity in metallurgy typically translates into lower capital expenses, easier operation, and reduced technical uncertainty.
Fast Leach Kinetics
Another key finding was the rapid rate of gold dissolution, with most extraction occurring within the first 24 hours. Fast kinetics reduce processing time, potentially shrinking tank sizes and lowering operating costs. This strengthens project feasibility by improving throughput efficiency and reducing the required plant footprint.
Soft Ore with Low Grinding Energy Requirements
Test results show that the Lemhi ore is relatively soft, with a favorable Bond Ball Mill Work Index. This means it requires less energy to grind, which lowers milling costs—a major component of gold processing expenses. Soft, uniform ore characteristics also reduce equipment wear, further decreasing long-term operating costs.
Test results show that the Lemhi ore is relatively soft, with a favorable Bond Ball Mill Work Index. This means it requires less energy to grind, which lowers milling costs—a major component of gold processing expenses. Soft, uniform ore characteristics also reduce equipment wear, further decreasing long-term operating costs.
Moderate Reagent Consumption
Chemical consumption rates—particularly cyanide and lime—were reported as average to low, which is important because reagents contribute significantly to operational costs in CIL plants. Moderate use indicates that the ore does not have unusual chemistry that would complicate processing or lead to cost overruns.
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