# Cobra's Wudinna Keeps 91% of Recovery on 40% Less Reagent

Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--6244ac52-5850-4603-881a-a566c4c1a8bd

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: 2026-09-17T19:18:25.764Z

Atlas analysis updated: 2026-09-17T19:18:25.764Z

- Company: Cobra Resources

- Ticker: COBR

- Exchange: Unavailable

- Region: South Australia

- Primary commodity: Rare earth

- Secondary commodities: Uranium

- Document categories: Metallurgy

- Extracted: 2026-09-17 19:18:26 UTC

Narrative sentiment: 0.60 · Bullish

## Minestarters Atlas summary

Cobra Resources has completed 24-hour desorption tests at its Wudinna rare earth project, establishing a measured recovery curve for the Boland and Head prospects. The results demonstrate that reducing ammonium sulfate concentration by 40% at Boland retains over 90% of the NdPr recovery, and even reagent-free acidified groundwater provides a significant recovery floor.

Reasoning: The desorption tests provide a quantified recovery envelope across varying reagent strengths and pH levels, significantly de-risking the technical aspect of the in situ recovery \(ISR\) method for the scoping study.

- Positive factor: Measured recovery curve established

- Positive factor: High recovery retention with reduced reagent concentration

- Positive factor: Significant reagent-free recovery baseline

- Positive factor: Bench-scale testing confirms ISR amenability

- Negative factor: Commercial reagent consumption not yet established

- Negative factor: Head prospect shows lower absolute recovery than Boland

- Negative factor: Uranium recovery highly sensitive to reagent removal

Facts used in scoring: 5

## Classification and evidence

**Bench Scale Only**

Polarity: negative

Definition: Only preliminary bench tests completed — no locked-cycle or pilot work.

Why it applies: The document describes 'bench-scale testing' and '24-hour desorption tests' on composites, which are preliminary screening-level tests.

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-staging.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--6244ac52-5850-4603-881a-a566c4c1a8bd#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 %
- Recovery Basis: actual\_test
- Head Grade: 605
- Head Grade Unit: ppm

#### Lab

- Laboratory: ANSTO

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2026-09-17T00:00:00.000Z

Reasoning: Baseline high recovery for the prospect under matched conditions.

- Positive factor: High recovery at full strength

Evidence · text

> At pH 3, the Boland composite recovered 77% of its neodymium and praseodymium \(NdPr\)

### desorption tests

[Link to this fact](https://atlas-staging.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--6244ac52-5850-4603-881a-a566c4c1a8bd#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 %
- Recovery Basis: actual\_test
- Head Grade: 605
- Head Grade Unit: ppm

#### Lab

- Laboratory: ANSTO

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2026-09-17T00:00:00.000Z

Reasoning: Demonstrates strong economic potential by maintaining ~91% of recovery with significantly less reagent.

- Positive factor: High recovery retention despite 40% reagent reduction

Evidence · text

> Moving to 0.3 M, a 40% reduction in reagent concentration, returned 70% NdPr

### desorption tests

[Link to this fact](https://atlas-staging.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--6244ac52-5850-4603-881a-a566c4c1a8bd#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, reagent-free acidified groundwater, pH 3

#### Recovery

- Recovery: 51 %
- Recovery Basis: actual\_test
- Head Grade: 605
- Head Grade Unit: ppm

#### Lab

- Laboratory: ANSTO

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2026-09-17T00:00:00.000Z

Reasoning: Establishes a baseline recovery level that reduces the absolute reagent requirement.

- Positive factor: 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-staging.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--6244ac52-5850-4603-881a-a566c4c1a8bd#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 %
- Recovery Basis: actual\_test
- Head Grade: 706
- Head Grade Unit: ppm

#### Lab

- Laboratory: ANSTO

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2026-09-17T00:00:00.000Z

Reasoning: Shows different metallurgical response at Head prospect compared to Boland.

- Negative factor: 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-staging.minestarters.com/news/cobra-s-wudinna-keeps-91-of-recovery-on-40-less-reagent--6244ac52-5850-4603-881a-a566c4c1a8bd#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 AMSUL vs 0.0 M AMSUL, pH 3

#### Recovery

- Recovery: 29 %
- Recovery Basis: actual\_test
- Head Grade: 605
- Head Grade Unit: ppm

#### Lab

- Laboratory: ANSTO

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2026-09-17T00:00:00.000Z

Reasoning: Uranium recovery drops significantly when reagent is removed, indicating a potential byproduct recovery risk.

- Negative factor: High sensitivity to reagent removal

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.