# Metallurgical Optimisation Delivers High Recoveries                                                                                                                  3 										                                             pages                                                                                       									                                                                                                                          362.0KB

Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce

Original source: https://www.asx.com.au/asx/v2/statistics/displayAnnouncement.do?display=pdf&idsId=03009185

Publisher: asx

Original announcement: 2025-10-14T00:00:00.000Z

Analysis by Minestarters Atlas

Atlas analysis published: 2026-10-01T04:40:14.477Z

Atlas analysis updated: 2026-10-01T04:40:14.477Z

- Company: Aurora Energy Metals Limited

- Ticker: 1AE

- Exchange: ASX

- Region: southeast Oregon, USA

- Primary commodity: Uranium

- Secondary commodities: None reported

- Document categories: Metallurgy

- Extracted: 2026-10-01 04:40:15 UTC

Narrative sentiment: 0.90 · Bullish

## Minestarters Atlas summary

Aurora Energy Metals Limited announced highly positive results from its metallurgical optimisation program for the Aurora Uranium Project. The program confirmed high uranium recoveries in the 82-86% range, while dramatically reducing initial acid addition and overall acid consumption, and halving leach duration. The testwork also simplified the flowsheet by demonstrating co-processing of clay and middlings, and eliminated the need for ferric sulphate, all of which are expected to significantly improve project economics.

Reasoning: The metallurgical optimisation program delivered high uranium recoveries \(82-86%\) while significantly reducing reagent consumption \(acid, ferric sulphate\), shortening leach times, and simplifying the processing flowsheet. These improvements are expected to materially enhance the project's economics and de-risk future studies.

- Positive factor: Significantly reduced acid consumption \(initial and overall\)

- Positive factor: Reduced leach duration by 50%

- Positive factor: Elimination of ferric sulphate requirement

- Positive factor: Simplified flowsheet by processing clay and middlings together

- Positive factor: Demonstrated potential for further cost savings through leach solution recycling

- Positive factor: High uranium recoveries consistently achieved

Low confidence — this extraction should be reviewed alongside the original source.

Facts used in scoring: 19

## Classification and evidence

**High Recovery**

Polarity: positive

Definition: Recovery at or above the exceptional band for the commodity and processing route.

Why it applies: The optimisation program confirmed uranium recoveries in the high 80% range \(82–86%\), with several tests achieving over 88% and even 90% recovery, which is in the strong to exceptional band for uranium.

Evidence · text

> uranium recoveries in the high 80% range \(82–86%\) can be consistently achieved under optimised conditions

**Recovery Improving**

Polarity: positive

Definition: Recovery improved versus a like-for-like prior test program on the same domain and route.

Why it applies: The program achieved recovery with significantly reduced initial acid addition \(≈250–240 kg/t vs. >600 kg/t previously\) and overall acid consumption \(~70–90 kg/t\), and leach duration was halved from 24 hours to ~12 hours.

Evidence · text

> Recovery achieved with significantly reduced initial acid addition \(≈250–240 kg/t vs. >600 kg/t previously\). Acid consumption lowered to ~70–90 kg/t, enhancing project economics. Leach duration reduced to ~12 hours

**Multi-Domain Tested**

Polarity: positive

Definition: Variability across ore domains \(oxide, transition, fresh\) has been addressed.

Why it applies: Tests demonstrate no requirement for separate processing of clay and middlings, simplifying the flowsheet and reducing costs.

Evidence · text

> Tests demonstrate no requirement for separate processing of clay and middlings, simplifying flowsheet and reducing capital/operating costs.

**QP/CP Signed**

Polarity: positive

Story-specific tag

Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience.

Why it applies: The metallurgical results are based on information compiled by Mr. Warren Hallam, a director of Aurora Energy Metals Limited and a Fellow of the Australasian Institute of Mining and Metallurgy \(FAusIMM\), who qualifies as a Competent Person.

Evidence · text

> The information in this announcement relating to Metallurgical Results is based on information compiled by Mr. Warren Hallam, BSc \(Metallurgy\), a director of Aurora Energy Metals Limited, who is a Fellow of the Australasian Institute of Mining and Metallurgy \(FAusIMM\)

**Mill Route**

Polarity: neutral

Definition: Processing via mill or concentrator \(CIL, CIP, tank leach, flotation\).

Why it applies: The testwork was conducted using atmospheric and pressure leach methods, which are typical for mill processing routes.

Evidence · table

> Atmospheric

Context: M2 Middlings

## Extracted facts

Stored fact records: 19. Some facts used in scoring do not have a stored record.

## Metallurgical Results (19)

### Atmospheric leach

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-0)

Aurora Uranium Project · uranium

Historical result

Needs review: historical\_restatement

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: preliminary
- Test Type: Atmospheric leach
- Processing Route: Atmospheric leach
- Sample: clay and middlings fractions

#### Recovery

- Recovery: 85 %

#### Reagents

- Acid: 600 kg/t
- Reagent Notes: High acid additions \(>600 kg/t\). Ferric sulphate likely used. Leach duration 24 hours.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: Yes
- Review Reason: historical\_restatement
- Historical: Yes
- Historical Source Date: 2024-12-16T00:00:00.000Z

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This historical result established a strong basis for further work with high recoveries, but also highlighted opportunities for process optimization due to high reagent intensity and longer leach duration.

- Positive factor: High recovery achieved

- Negative factor: High acid consumption

- Negative factor: Longer leach duration

Evidence · text

> recoveries of more than 85% from both clay and middlings fractions using atmospheric leach circuits at high acid additions \(ASX release 16 December 2024\)

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-1)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M2 Middlings
- Grind P80: 600 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 72.1 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 51 kg/t
- Reagent Notes: Initial Acid Addition: 150 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test shows reduced acid consumption and potential for further savings, but the recovery is not as high as the optimized range, indicating variability or sub-optimal conditions for this specific test.

- Positive factor: Reduced acid consumption compared to prior tests

- Positive factor: Potential for further cost savings through leach solution recycling

- Negative factor: Recovery is lower than the high 80% range achieved in other optimized tests

Evidence · table

> 721

Context: M2 Middlings

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-2)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M3 Middlings
- Grind P80: 300 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 66.1 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 61 kg/t
- Reagent Notes: Initial Acid Addition: 150 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test shows reduced acid consumption but a lower recovery, suggesting that the grind size or other parameters were not optimal for achieving the highest recoveries in this specific test.

- Positive factor: Reduced acid consumption compared to prior tests

- Positive factor: Potential for further cost savings through leach solution recycling

- Negative factor: Recovery is lower than the high 80% range achieved in other optimized tests

Evidence · table

> 661

Context: M3 Middlings

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-3)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M4 Middlings
- Grind P80: 150 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 70.1 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 54 kg/t
- Reagent Notes: Initial Acid Addition: 150 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test shows reduced acid consumption but a lower recovery, suggesting that the grind size or other parameters were not optimal for achieving the highest recoveries in this specific test.

- Positive factor: Reduced acid consumption compared to prior tests

- Positive factor: Potential for further cost savings through leach solution recycling

- Negative factor: Recovery is lower than the high 80% range achieved in other optimized tests

Evidence · table

> 701

Context: M4 Middlings

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-4)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M7 Middlings
- Grind P80: 600 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 75.1 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 27 kg/t
- Reagent Notes: Initial Acid Addition: 150 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test shows very low acid consumption and potential for further savings, but the recovery is still below the optimized range, indicating that other parameters might need adjustment for higher recovery.

- Positive factor: Reduced acid consumption compared to prior tests

- Positive factor: Potential for further cost savings through leach solution recycling

- Negative factor: Recovery is lower than the high 80% range achieved in other optimized tests

Evidence · table

> 751

Context: M7 Middlings

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-5)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M10 Middlings
- Grind P80: 600 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 89.1 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 133 kg/t
- Reagent Notes: Initial Acid Addition: 630 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test demonstrates a strong recovery in the high 80% range, aligning with the overall positive results of the optimization program.

- Positive factor: High recovery achieved \(strong band\)

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 891

Context: M10 Middlings

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-6)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M11 Middlings
- Grind P80: 600 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 90.1 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 142 kg/t
- Reagent Notes: Initial Acid Addition: 630 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test achieved an exceptional recovery of over 90%, demonstrating the high potential of the optimized process.

- Positive factor: Exceptional recovery achieved \(exceptional band\)

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 901

Context: M11 Middlings

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-7)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M12 Middlings
- Grind P80: 600 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 77.2 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 69 kg/t
- Reagent Notes: Initial Acid Addition: 150 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test shows reduced acid consumption and potential for further savings, but the recovery is still below the optimized range, indicating that other parameters might need adjustment for higher recovery.

- Positive factor: Reduced acid consumption compared to prior tests

- Positive factor: Potential for further cost savings through leach solution recycling

- Negative factor: Recovery is lower than the high 80% range achieved in other optimized tests

Evidence · table

> 772

Context: M12 Middlings

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-8)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M13 Middlings
- Grind P80: 600 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 93.2 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 43 kg/t
- Reagent Notes: Initial Acid Addition: 400 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test achieved an exceptional recovery with very low acid consumption, highlighting the significant improvements from the optimization program.

- Positive factor: Exceptional recovery achieved \(exceptional band\)

- Positive factor: Very low acid consumption

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 932

Context: M13 Middlings

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-9)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: M14 Middlings
- Grind P80: 600 µm
- Leach Time: 12 hours

#### Recovery

- Recovery: 89.2 %
- Head Grade: 381
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 33 kg/t
- Reagent Notes: Initial Acid Addition: 250 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test demonstrates high recovery with significantly reduced acid consumption and leach duration, representing a key achievement of the optimization program.

- Positive factor: High recovery achieved \(strong band\)

- Positive factor: Very low acid consumption

- Positive factor: Reduced leach duration \(12 hours\)

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 892

Context: M14 Middlings

### Pressure

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-10)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Pressure
- Processing Route: Pressure leach
- Sample: C5 Clay
- Grind P80: 38 µm
- Leach Time: 2 hours

#### Recovery

- Recovery: 45.3 %
- Head Grade: 350
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 44 kg/t
- Reagent Notes: Initial Acid Addition: 150 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: Despite a very short leach duration and reduced acid consumption, the recovery for this pressure leach test on clay material is very low, indicating this specific condition is not optimal.

- Positive factor: Very short leach duration \(2 hours\)

- Positive factor: Reduced acid consumption compared to prior tests

- Positive factor: Potential for further cost savings through leach solution recycling

- Negative factor: Very low recovery \(below weak band\)

Evidence · table

> 453

Context: C5 Clay

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-11)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: C6 Clay
- Grind P80: 38 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 88.1 %
- Head Grade: 350
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: -17 kg/t
- Reagent Notes: Initial Acid Addition: 150 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test on clay material achieved a high recovery with exceptionally low acid consumption, indicating a very efficient process under these conditions.

- Positive factor: High recovery achieved \(strong band\)

- Positive factor: Very low acid consumption \(negative value implies acid generation or very low consumption\)

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 881

Context: C6 Clay

### Pressure

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-12)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Pressure
- Processing Route: Pressure leach
- Sample: C8 Clay
- Grind P80: 38 µm
- Leach Time: 2 hours

#### Recovery

- Recovery: 85.3 %
- Head Grade: 350
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 125 kg/t
- Reagent Notes: Initial Acid Addition: 630 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This pressure leach test on clay achieved a high recovery in a very short leach duration, demonstrating efficient processing for this material type.

- Positive factor: High recovery achieved \(moderate band\)

- Positive factor: Very short leach duration \(2 hours\)

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 853

Context: C8 Clay

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-13)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: C9 Clay
- Grind P80: 38 µm
- Leach Time: 24 hours

#### Recovery

- Recovery: 90.2 %
- Head Grade: 350
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 51 kg/t
- Reagent Notes: Initial Acid Addition: 630 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test on clay material achieved an exceptional recovery with very low acid consumption, demonstrating the high potential of the optimized atmospheric leach process.

- Positive factor: Exceptional recovery achieved \(exceptional band\)

- Positive factor: Very low acid consumption

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 902

Context: C9 Clay

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-14)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: MC15 Midds + Clay
- Grind P80: 600 µm
- Leach Time: 12 hours

#### Recovery

- Recovery: 82.2 %
- Head Grade: 389
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 84 kg/t
- Reagent Notes: Initial Acid Addition: 270 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test successfully demonstrates high recovery from a combined middlings and clay sample with reduced acid consumption and leach duration, confirming the simplified flowsheet potential.

- Positive factor: High recovery achieved \(moderate band\)

- Positive factor: Reduced acid consumption

- Positive factor: Reduced leach duration \(12 hours\)

- Positive factor: Demonstrates co-processing of middlings and clay

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 822

Context: MC15 Midds + Clay

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-15)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: MC16 Midds + Clay
- Grind P80: 601 µm
- Leach Time: 12 hours

#### Recovery

- Recovery: 86.2 %
- Head Grade: 389
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 95 kg/t
- Reagent Notes: Initial Acid Addition: 240 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test successfully demonstrates high recovery from a combined middlings and clay sample with significantly reduced acid consumption and leach duration, confirming the simplified flowsheet potential and strong project economics.

- Positive factor: High recovery achieved \(strong band\)

- Positive factor: Reduced acid consumption

- Positive factor: Reduced leach duration \(12 hours\)

- Positive factor: Demonstrates co-processing of middlings and clay

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 862

Context: MC16 Midds + Clay

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-16)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: MC17 Midds + Clay
- Grind P80: 602 µm
- Leach Time: 12 hours

#### Recovery

- Recovery: 84.2 %
- Head Grade: 389
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 64 kg/t
- Reagent Notes: Initial Acid Addition: 240 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test successfully demonstrates high recovery from a combined middlings and clay sample with reduced acid consumption and leach duration, confirming the simplified flowsheet potential.

- Positive factor: High recovery achieved \(moderate band\)

- Positive factor: Reduced acid consumption

- Positive factor: Reduced leach duration \(12 hours\)

- Positive factor: Demonstrates co-processing of middlings and clay

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 842

Context: MC17 Midds + Clay

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-17)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: MC18 Midds + Clay
- Grind P80: 603 µm
- Leach Time: 12 hours

#### Recovery

- Recovery: 80.2 %
- Head Grade: 389
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 66 kg/t
- Reagent Notes: Initial Acid Addition: 240 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test successfully demonstrates good recovery from a combined middlings and clay sample with reduced acid consumption and leach duration, confirming the simplified flowsheet potential.

- Positive factor: High recovery achieved \(weak band\)

- Positive factor: Reduced acid consumption

- Positive factor: Reduced leach duration \(12 hours\)

- Positive factor: Demonstrates co-processing of middlings and clay

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 802

Context: MC18 Midds + Clay

### Atmospheric

[Link to this fact](https://atlas-staging.minestarters.com/news/metallurgical-optimisation-delivers-high-recoveries-3-pages-362-0kb--d6d27c3d-850c-4007-b9f0-511afd85b7ce#fact-metallurgical-facts-18)

Aurora Uranium Project · uranium

#### Identity

- Project: Aurora Uranium Project
- Commodity: uranium
- Region: southeast oregon, usa
- Reported Region: southeast Oregon, USA
- Ticker: 1AE

#### Test Work

- Program Status: optimization
- Test Type: Atmospheric
- Processing Route: Atmospheric leach
- Sample: MC19 Midds + Clay
- Grind P80: 604 µm
- Leach Time: 12 hours

#### Recovery

- Recovery: 83.2 %
- Head Grade: 389
- Head Grade Unit: ppm U3O8

#### Reagents

- Acid: 83 kg/t
- Reagent Notes: Initial Acid Addition: 239 kg/t. No ferric sulphate required. Leach solution recycling demonstrated.

#### Lab

- Laboratory: ALS Metallurgy Perth

#### Location

- Loc. Confidence: medium

#### Review

- Needs Review: No
- Historical: No

#### Dates

- Event date: 2025-10-14T00:00:00.000Z

Reasoning: This test successfully demonstrates high recovery from a combined middlings and clay sample with reduced acid consumption and leach duration, confirming the simplified flowsheet potential.

- Positive factor: High recovery achieved \(moderate band\)

- Positive factor: Reduced acid consumption

- Positive factor: Reduced leach duration \(12 hours\)

- Positive factor: Demonstrates co-processing of middlings and clay

- Positive factor: Potential for further cost savings through leach solution recycling

Evidence · table

> 832

Context: MC19 Midds + Clay

## 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.