Kodiak Copper Corp. (the “Company” or “Kodiak”) (TSX-V: KDK, OTCQB: KDKCF, Frankfurt: 5DD1) today reports results from its second metallurgical program conducted on samples from the Company’s 100%-owned MPD copper-gold project in southern British Columbia. The testwork built on the positive results from the Company’s initial metallurgical program in 2025 and continued to return robust recoveries and concentrates while demonstrating that the grind size needed to achieve liberation is within acceptable industry parameters. The results reinforce that the deposits at MPD are amenable to a traditional sulphide flotation flowsheet.
Highlights
- Optimized rougher flotation testwork demonstrated improved performance relative to the previous metallurgical work, with less energy invested into liberation due to a higher grind size. Rougher recoveries of up to 91.1%, 81.4% and 80.4% for copper, gold and silver respectively, were achieved while increasing grind size to a P80 of 150 µm.
- The first locked-cycle test was completed, simulating continuous processing conditions using flowsheet parameters consistent with regional copper operations. The test confirmed stable and repeatable flotation performance with overall cleaner concentrate recoveries of 78.7% copper, 60% gold, and 49.3% silver.
- Gold recovery was improved in both rougher testwork and locked cycle tests. It was confirmed that a portion of gold is present as free gold and that the application of gravity recovery processes may provide an opportunity to further improve gold recovery.
- As part of its ongoing technical work programs, Kodiak will continue to advance metallurgical studies, including variability testing and process optimization, to further improve performance.
Claudia Tornquist, President and CEO of Kodiak said, “The results of the recent metallurgical testwork are positive, with improvements that will potentially benefit the future economics of the project. Increasing the grind size and identifying opportunities to improve gold recovery are particularly encouraging. The completion of the first locked cycle test was also an important step forward since this work more closely reflects performance in a production-scale plant. We look forward to continue building our knowledge and de-risking the project through further metallurgical testing.”
The initial 2025 metallurgical program provided insights into baseline copper and gold recoveries, a basic understanding of the factors that impact metal recovery and observations that the samples contained low concentrations of deleterious trace metals. This second program deepened the metallurgical and mineralogical understanding of the MPD deposits. Testwork included grind size optimization to improve the grind vs recovery relationship, an investigation to better identify gold deportment in the samples through diagnostic leach testing and the first locked cycle test to identify specific elements of the flotation circuit for improvement. One composite sample comprising the MPD North High Grade and the MPD South samples from the initial 2025 program was analysed.
Rougher Grind Size Optimization
As part of the second phase metallurgical program, Kodiak undertook testing to evaluate the impact of increasing the primary grind size used in the initial testwork from a P80 of 75 µm (80% of the mass finer than 75µm) to a P80 of 150 µm. An increase in the grind size would reduce the energy investment needed to achieve target recoveries. This work was conducted through optimizing reagent schemes, residence times, and flotation conditions established during the final phase of the previous program of metallurgical testwork.
The testwork demonstrated that rougher recoveries comparable to those achieved during the initial program in 2025 could be obtained at a coarser grind size. These results show that the deposits tested respond favourably to grind sizes typically used in sulphide flotation circuits. Table 1 presents a comparison of the rougher results for various test batches at a 150 µm grind size vs the 2025 metallurgical program at 75 µm.
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