# Cobra's Wudinna Keeps 91% of Recovery on 40% Less Reagent Canonical Atlas analysis: https://atlas-extractions.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--c9c3dd01-02dd-4213-af43-debadc6f61fd Original source: https://www.cruxinvestor.com/posts/cobras-wudinna-keeps-91-of-recovery-on-40-less-reagent Publisher: cruxinvestor Original announcement: 2026-09-17T00:00:00.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - Company: Cobra Resources - Ticker: COBR - Exchange: Unavailable - Region: South Australia - Primary commodity: Rare earth - Secondary commodities: Uranium - Document categories: Metallurgy, Economic study - Extracted: 2026-09-17 19:38:02 UTC Narrative sentiment: 0.60 · Bullish ## Minestarters Atlas summary Cobra Resources has completed desorption testing at its Wudinna rare earth project, establishing a measured recovery curve for both the Boland and Head prospects. The tests demonstrate that significant NdPr and HREE recoveries can be maintained even with a 40% reduction in ammonium sulfate concentration or by using acidified groundwater alone. Reasoning: The desorption test results provide a quantified technical envelope for the project's economics, replacing single-point assumptions with a measured response curve, which significantly de-risks the metallurgical component of the upcoming scoping study. - Positive factor: Measured recovery curve established across multiple reagent strengths and pH levels - Positive factor: High recovery retention \(91%+\) when reducing reagent concentration by 40% - Positive factor: Significant 'reagent-free' floor established via acidified groundwater - Positive factor: In situ recovery \(ISR\) method identified as cost-effective and amenable to mineralization - Negative factor: Head prospect shows significantly lower absolute NdPr recovery compared to Boland - Negative factor: Commercial reagent consumption and preferred operating conditions not yet determined Facts used in scoring: 5 ## Classification and evidence **Mill Route** Polarity: neutral Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\). Why it applies: The project utilizes in situ recovery \(ISR\) which is a solution-based extraction method. Evidence · text > That confinement lets the deposit be worked by in situ recovery \(ISR\), a method that dissolves the metal underground instead of excavating it. **Bench Scale Only** Polarity: negative Definition: Only preliminary bench tests completed — no locked-cycle or pilot work. Why it applies: The results are derived from 24-hour desorption tests on bulk composites, which are bench-scale/screening level. Evidence · text > Bench-scale testing indicates the mineralization is amenable to ISR recovery techniques. **Multi-Domain Tested** Polarity: positive Definition: Variability across ore domains \(oxide, transition, fresh\) has been addressed. Why it applies: 2 distinct composites were tested ## Extracted facts Stored fact records: 5. Some facts used in scoring do not have a stored record. ## Metallurgical Results (5) ### desorption tests [Link to this fact](https://atlas-extractions.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--c9c3dd01-02dd-4213-af43-debadc6f61fd#fact-metallurgical-facts-0) Wudinna · neodymium and praseodymium #### Identity - Project: Wudinna - Commodity: neodymium and praseodymium - Region: australia\_sa - Reported Region: South Australia - Ticker: COBR #### Test Work - Program Status: preliminary - Test Type: desorption tests - Processing Route: in situ recovery \(ISR\) - Sample: Boland composite, 0.5 M AMSUL, pH 3 #### Recovery - Recovery: 77 % - Head Grade: 605 - Head Grade Unit: ppm #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: High recovery at full strength reagent concentration. Evidence · text > At pH 3, the Boland composite recovered 77% of its neodymium and praseodymium \(NdPr\) ### desorption tests [Link to this fact](https://atlas-extractions.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--c9c3dd01-02dd-4213-af43-debadc6f61fd#fact-metallurgical-facts-1) Wudinna · neodymium and praseodymium #### Identity - Project: Wudinna - Commodity: neodymium and praseodymium - Region: australia\_sa - Reported Region: South Australia - Ticker: COBR #### Test Work - Program Status: preliminary - Test Type: desorption tests - Processing Route: in situ recovery \(ISR\) - Sample: Boland composite, 0.3 M AMSUL, pH 3 #### Recovery - Recovery: 70 % - Head Grade: 605 - Head Grade Unit: ppm #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Demonstrates high efficiency in reagent reduction. - Positive factor: Maintains 91% of the 0.5M recovery with 40% less reagent Evidence · text > Moving to 0.3 M, a 40% reduction in reagent concentration, returned 70% NdPr ### desorption tests [Link to this fact](https://atlas-extractions.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--c9c3dd01-02dd-4213-af43-debadc6f61fd#fact-metallurgical-facts-2) Wudinna · neodymium and praseodymium #### Identity - Project: Wudinna - Commodity: neodymium and praseodymium - Region: australia\_sa - Reported Region: South Australia - Ticker: COBR #### Test Work - Program Status: preliminary - Test Type: desorption tests - Processing Route: in situ recovery \(ISR\) - Sample: Boland composite, acidified groundwater \(no AMSUL\), pH 3 #### Recovery - Recovery: 51 % - Head Grade: 605 - Head Grade Unit: ppm #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Provides a baseline for minimum reagent-free recovery. - Positive factor: Establishes a significant recovery floor without external reagent Evidence · text > acidified site groundwater with no added AMSUL still recovered 51% NdPr ### desorption tests [Link to this fact](https://atlas-extractions.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--c9c3dd01-02dd-4213-af43-debadc6f61fd#fact-metallurgical-facts-3) Wudinna · neodymium and praseodymium #### Identity - Project: Wudinna - Commodity: neodymium and praseodymium - Region: australia\_sa - Reported Region: South Australia - Ticker: COBR #### Test Work - Program Status: preliminary - Test Type: desorption tests - Processing Route: in situ recovery \(ISR\) - Sample: Head composite, 0.5 M AMSUL, pH 3 #### Recovery - Recovery: 40 % - Head Grade: 706 - Head Grade Unit: ppm #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Lower absolute recovery levels at the Head prospect. - Negative factor: Significantly lower absolute recovery compared to Boland Evidence · text > At 0.5 M and pH 3, the Head prospect recovered 40% NdPr ### desorption tests [Link to this fact](https://atlas-extractions.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--c9c3dd01-02dd-4213-af43-debadc6f61fd#fact-metallurgical-facts-4) Wudinna · uranium #### Identity - Project: Wudinna - Commodity: uranium - Region: australia\_sa - Reported Region: South Australia - Ticker: COBR #### Test Work - Program Status: preliminary - Test Type: desorption tests - Processing Route: in situ recovery \(ISR\) - Sample: Boland composite, 0.5 M vs 0.0 M AMSUL, pH 3 #### Recovery - Recovery: 5 % #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-09-17T00:00:00.000Z Reasoning: Shows uranium recovery is highly sensitive to reagent presence. - Negative factor: Uranium recovery drops significantly when reagent is removed Evidence · text > reducing AMSUL from 0.5 M to 0.0 M reduced uranium recovery from 29% to 5% ## How Atlas produces this analysis Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.