Rimfire Pacific Mining Confirms Strong Scandium Recoveries to Support Lower Capital Processing at Murga

Rimfire's Murga scandium tests show modest early recoveries, with higher rates only projected.

What the company is saying

Rimfire Pacific Mining is highlighting progress in Stage 2 bottle roll metallurgical testing at its Murga scandium deposit in central New South Wales. The company emphasizes the use of simple, cost-effective leaching methods under ambient conditions, suggesting a low-cost technical approach. After 15 weeks, they report scandium recoveries of 22.7% from a 0.74 kg saprolite sample and 15.2% from a 1 kg laterite sample. The announcement projects that, if current extraction rates persist, recoveries could reach at least 60% for saprolite and 30% for laterite over a 365-day period, referencing analogous heap leach operations and published research showing up to 80% extraction in other regions. The tone is optimistic, focusing on potential scalability and commercial viability, but the company does not provide economic analysis, cost data, or resource estimates. The narrative leans on external benchmarks and linear extrapolation to frame the upside, while actual results remain at a laboratory scale.

What the data suggests

The disclosed figures show 22.7% scandium recovery from saprolite and 15.2% from laterite after 15 weeks of bottle roll testing. These results are based on small samples—0.74 kg for saprolite and 1 kg for laterite—using atmospheric, ambient leaching methods. The company projects that recoveries could reach 60% for saprolite and 30% for laterite if the extraction rate remains constant over 365 days, but this is not yet demonstrated. Industry analogues suggest heap leaching typically occurs over 100 to 400 days, and external research indicates up to 80% extraction is possible in other saprolite ores, but no direct evidence is provided that Murga will match these outcomes. The data is specific for laboratory conditions but does not address scale-up, cost, or economic feasibility. No resource size, grade, or financial metrics are disclosed, so the results are purely technical and preliminary.

Analysis

The announcement presents realised technical progress—specifically, 15-week scandium recoveries of 22.7% (saprolite) and 15.2% (laterite)—from small-scale bottle roll tests. However, the most optimistic claims are forward-looking projections, suggesting recoveries could reach 60% and 30% over a full year if current rates persist. This projection is not yet demonstrated and relies on the assumption of linear recovery, which is referenced but not substantiated with direct data. The tone is positive, emphasizing 'simple and cost-effective' methods and referencing external research to bolster confidence, but the actual results are early-stage and not yet commercially significant. No large capital outlay is disclosed, and the technical work is at a laboratory scale, so capital intensity is low at this stage. The gap between narrative and evidence lies in the extrapolation from short-term lab results to long-term commercial outcomes, which remains unproven.

Risk flags

• ●The main operational risk is that the projected recovery rates of 60% (saprolite) and 30% (laterite) are not yet demonstrated and rely on the assumption that current extraction rates will persist linearly over a full year. If actual recoveries plateau or decline over time, commercial viability could be significantly reduced.
• ●There is a scale-up risk, as all results to date are from small laboratory samples (0.74 kg and 1 kg) and may not translate to larger-scale or field conditions. Heap leaching at commercial scale can introduce variables not present in bottle roll tests, such as solution channeling, reagent consumption, and ore heterogeneity.
• ●The absence of economic data, resource estimates, or cost analysis means investors have no visibility on whether the Murga deposit can be developed profitably, even if technical recoveries improve. Without this information, the path to commercialisation remains highly uncertain.

Bottom line

Rimfire's update provides early-stage technical results from small-scale bottle roll tests at the Murga scandium deposit, with 15-week recoveries of 22.7% (saprolite) and 15.2% (laterite). The company's projections of 60% and 30% recoveries over a year are not yet supported by long-duration or larger-scale data and assume a linear extraction profile that may not hold in practice. No resource, cost, or economic figures are disclosed, so the announcement is not actionable for investors seeking near-term value or commercial clarity. The most important takeaway is that while the technical process appears simple and initial recoveries are measurable, the leap to commercial viability is unproven and will require much longer-term, larger-scale testing and full economic assessment. Investors should watch for future updates that provide extended test results, resource estimates, and cost data to validate the project's potential.

Announcement summary

(ASX:RIM) Rimfire Pacific Mining reported progress on Stage 2 (long-term) bottle roll testing of low-iron host rock samples from the Murga scandium deposit in central New South Wales. The testing is being conducted on a 0.74 kilogram sample of saprolite-hosted scandium material and a 1 kilogram sample of laterite-hosted material. The leaching techniques used are described as simple and cost-effective, operating at atmospheric pressures and ambient temperatures. After 15 weeks of testing, scandium recoveries reached 22.7% for the saprolite sample and 15.2% for the laterite sample. Early projections suggest that scandium recoveries could be enhanced to at least 60% for saprolite and 30% for laterite if the same extraction rate is maintained over a longer period, such as 365 days. The company notes that heap leaching of laterite-nickel-cobalt-scandium deposits with similar mineralogy to Murga typically occurs over 100 to 400 days. Published research indicates that European and West Australian saprolite ores can achieve up to 80% extraction over extended leaching periods. The bottle roll recovery data is said to be closely approximated by the linear response observed in heap leaching. These results are part of Rimfire Pacific Mining's ongoing metallurgical evaluation of the Murga scandium deposit.

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