17 October 2023

Aura Energy Limited (ASX: AEE, AIM: AURA) ("Aura" or "the Company") is pleased to announce it has acquired additional radiometric survey data, reviewed historical drilling results, and identified strong indications of mineralisation extensions on Aura's existing tenements that could significantly expand Aura's current Tiris Project ("Project") 58.9 Mlbs U₃O₈ resource.

Aura has signed contracts for an exploration program of 15,500m air core drilling over 78.1 km² on existing tenements, aiming to significantly increase the Inferred Mineral Resource at the Tiris Project in Mauritania by extending the existing resources. The mobilisation of the drilling contractor will commence on October 16^th,  with the program commencing soon after.

The potential quantity of the Exploration Target is conceptual in nature. There has been insufficient exploration of these targets to estimate a Mineral Resource, and it is uncertain whether this exploration effort will result in an estimation of a Mineral Resource.

Aura Managing Director David Woodall said,

"Aura's strategy is to be development-ready in relation to our Tiris Project, and this strategy is progressing and accelerating as we aim to expand our mineral resource.

The near-term, low-cost, producer status of our Tiris Project was confirmed by our March 2023 Enhanced Definitive Feasibility Study[1]. Further resource expansion towards 100m lbs of U₃O₈ progresses the project towards a global scale and reinforces the potential for Mauritania to be a material producer in the near term.  The robust economics of our Tiris Uranium Project will be further enhanced by increasing our mineral resources and reserves. Due to the modular nature of the project, we see outstanding opportunities to grow the annual production capacity of the project to 3.5Mlb per annum, equivalent to the planned back-end plant capacity."

"To that end, Aura will commence key pre-construction activities, including the geotechnical drilling of the proposed plant site, and allow some trial mining to provide valuable data in the production planning for the Tiris operation once developed."

Figure 1 - Tiris Project Exploration Program Target Areas

The exploration program will be conducted on existing granted tenements targeting the expansion of the Mineral Resources at the Tiris Project. It will focus on the Exploration Target shown in Table 1 below.

Table 1 - Proposed Exploration Target[3]

Exploration Target Estimate

A significant level of exploration has previously been undertaken by Aura on the currently held tenements, resulting in a Global Mineral Resource Estimate (MRE) of 113Mt at an average grade of 236ppm U₃O₈ containing 58.9 Mlbs U₃O₈[4], which was reported in a market announcement ("Major Resource Upgrade at Aura Energy's Tiris Project"), dated 14^th February 2023. The MRE has been based on 21,990 metres of drilling in 5,619 holes for a total project cost of US$11.9M or US$0.20 per lb U₃O₈.

Table 2 - Tiris Mineral Resource Estimate[5]

Historical drilling has shown a strong relationship between mineralisation and zones of high radiometric signature, as seen in Figures 1 and 2.

Additional radiometric survey data recently acquired revealed several newly high radiometric anomalies not yet drilled. Continuing our earlier work, geologists have defined a series of Exploration Targets (shown in Figure 1) where the relationship between radiometric signature and mineralisation suggests further Exploration Targets may be available.  Importantly, all targets are proximate to or contiguous with existing Inferred Resources and have yet to be tested by drilling.

Table 3 - Tiris Project Relationship of Radiometric Signature to Mineral Resource Estimate

The Exploration Targets are focused on calcrete-style uranium deposits and lay beneath flat land surfaces with shallow overburden.

The uranium mineralisation generally lies within weathered, partially decomposed red granite or in colluvial gravels developed on or near red granites. Small portions occur in other rock types, such as meta-volcanics and meta-sediments. The mineralisation is believed to have developed within shallow depressions or basins, where colluvial material has accumulated in desert sheet wash events. The pebbles within the gravels are generally unweathered fragments washed in from the nearby exfoliating granites and other crystalline rocks, mixed with sand, silt, calcrete, gypsum and yellow uranium vanadates. This mineralised veneer of relatively unconsolidated material is typically less than 5 metres in thickness, although locally, it can occur up to 12 metres in depth. It forms continuous deposits on the plains or occurs in depressions amongst granite outcrops.

Defined Mineral Resource Estimates[6] occur within high radiometric anomalies identified by airborne geophysical surveys. Several radiometric anomalies within currently held Leases have yet to be tested, and many previously drilled areas remain open at boundaries. Additionally, only high radiometric signature anomalies have been tested. Aura's geology team have determined that there is a possibility that the lower-level anomalies may contain economic resources or that the anomalies have been partially or fully obscured by sand cover.

Details of Target tonnage and grade calculations for the Exploration Target are presented in Table 4. In all cases within the Tiris East and West areas, the inputs to the calculation of the Exploration Target have been estimated using data from radiometric anomalies near a target, which have been tested by drilling and included in the Mineral Resource Estimate.

The potential Exploration Target, expressed as Mlbs U₃O₈/km², for each exploration area, has been determined using the metal return from drilling completed at each resource area adjacent to the nearest Inferred Resource, as shown in Table 3.

Table 4 - Exploration Target - Range of tonnage, grade and average Mlbs U₃O₈/km²

All Exploration Targets are grouped into five different categories reflecting the quality of the target, ranging from those on high radiometric anomalies to low anomalies that may be affected by sand cover.

In calculating the potential size of the Exploration Target, a probability of success was then estimated for each Target Category to determine each target's upper bound of possible U₃O₈. By way of example, high-quality targets on high radiometric anomalies were given a 0.9 chance of success. In comparison, conceptual Targets such as possible mineralisation beneath cover were given a 0.1 chance of success.

In this manner, high-quality targets were given the most significant influence on Target tonnage, while conceptual Targets were given minor influence. To be very conservative, the estimated probabilities of success were then halved to determine Target's lower tonnage and grade ranges. These categories are presented in Appendix 1, along with the upper bounds of estimated probabilities used to calculate Target ranges. 

An example of the categorisation of Exploration Targets for the Hippolyte West and Marie mineralised zones can be seen in Figure 2. This shows the relationship between the current Inferred Resource and the ranked Exploration Target areas. As demonstrated, the higher probability targets are on or directly adjacent to areas with high radiometric anomaly, which host mineralisation. Lower ranked targets cover areas of lower radiometric signature and where cover by sand dunes may have depressed the radiometric signature.

Figure 2 - Marie E-H, showing airborne U-radiometric anomalies, sand dunes, target categories, inferred resource outlines, and planned drillholes. Note that drilling has not been closed off, and portions of the high radiometric anomaly still need to be sufficiently tested.

The distribution of exploration targets for other mineralised zones within the Tiris East areas can be seen in Figures 5 to 14 in Appendix 2.

The development of Targets within currently held Leases has the benefit of providing tonnage close to presently planned operations, increasing the likelihood of mine life extension without having to modify the existing mining plan significantly. Additionally, the potential to develop higher-grade material in the Marie/Hippolyte West area (shown in Table 1) would substantially benefit profitability by adding higher-grade feed close to the treatment facility.

Exploration Program Plan

The Company proposes to commence an exploration program at Tiris East to test the Exploration Targets as soon as possible.  A drilling contractor has been selected, and the logistics planned around mobilising the air core rig into the country and to the Tiris East area. This will aim to rapidly complete 15,500m of air core drilling to grow the Resources within the Tiris East exploitation permits. Drilling at Tiris East will be to a depth of between 1 and 20 metres, with an average depth of 7 metres. Figures 5 to 15 in Appendix 2 show the proposed drilling plan for each mineralised area. 

The efficiency of exploration in the Tiris East project area is significantly increased because of the level of data available on existing mineral resources. Drilling calcrete-hosted uranium mineralisation is undertaken by aircore drilling, with downhole gamma logging used to measure equivalent U₃O₈ (eU₃O₈). This output is converted to U₃O₈ by calibration with assay and disequilibrium analysis, for which samples must be generated from diamond drilling. For a complete description, refer to ASX announcement: "Major Resource Upgrade at Aura Energy's Tiris Project" on 14^th February 2023.

A detailed review has determined that sufficient disequilibrium data is available in the Tiris East area for inferred resource reporting. This will reduce the time required to report resources by approximately four months, streamlining the exploration process. 

The aircore drilling program in Tiris East is expected to be completed within two months of the commencement of drilling, with an updated Mineral Resource Estimate to be completed shortly after the completion of the drilling program.

The Company will take the opportunity to commence pre-construction works for the Project during the exploration program. The activities will focus on trial mining to optimise mining costs and additional geotechnical studies.

Tenement Status

The Targets fall on mineral exploration permits held 100% by Aura Energy: 2365B4 Oued EL Foule Sud, and on 2 Exploitation permits: 2492C4 Oued El Foule, 2491C4 Ain Sder held by Tiris Ressources SA. Oum Ferkik is currently under application for transfer from an Exploration Permit to an Exploitation Permit. Tiris Ressources SA is owned 85% by Aura Energy subsidiary, Aura Energy Mauritania, and 15% by ANARPAM, a Mauritanian Government entity.

ENDS

The Board of Aura Energy Ltd has approved this announcement.

Market Abuse Regulation (MAR) Disclosure

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014 as it forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018 ('MAR'). Upon the publication of this announcement via Regulatory Information Service ('RIS'), this inside information is now considered to be in the public domain.

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About Aura Energy (ASX: AEE, AIM: AURA)  

Aura Energy is an Australian-based minerals company with major uranium and battery metals projects with significant resources in Africa and Europe. The Company primarily focuses on uranium production from the Tiris Project, a significant greenfield uranium discovery in Mauritania.

A recent Enhanced Feasibility Study at Tiris has increased the project NPV significantly, reconfirming the project as one of the lowest capex, lowest operating cost uranium projects that remain undeveloped worldwide.

A Scoping Study into the Häggån Battery Metals Project in Sweden has outlined compelling economic value. Aura plans to follow up this study with further exploration to lift the Resource categorisation alongside close collaboration with the community surrounding the project to foster support to proceed.

In 2023, Aura will continue transitioning from a uranium explorer to a uranium producer to capitalise on the rapidly growing demand for nuclear power as the world shifts towards a decarbonised energy sector.

Disclaimer Regarding Forward-Looking Statements 

This ASX announcement (Announcement) contains various forward-looking statements. All statements other than statements of historical fact are forward-looking statements. Forward-looking statements are inherently subject to uncertainties in that they may be affected by various known and unknown risks, variables and factors which could cause actual values or results, performance, or achievements to differ materially from the expectations described in such forward-looking statements. The Company does not guarantee that the anticipated results, performance, or achievements expressed or implied in those forward-looking statements will be achieved. 

Competent Persons

The Competent Person for Exploration Target Estimation is Dr Michael Fletcher. The information in the report to which this statement is attached relates to compiling Exploration Target data and is based on information compiled by Dr Michael Fletcher. Dr Fletcher has sufficient relevant experience in the preparation and compilation of exploration data across a broad range of deposits to qualify as a Competent Person as defined in the 2012 edition of the 'Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves'. Dr Fletcher is a consultant to Aura Energy, and a full-time employee of GeoEndeavours Pty Ltd. Dr Fletcher is a Member of the Australasian Institute of Geoscientists and consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.

The Tiris Uranium Resource Estimate was reported in 2023 under the 2012 Edition of the "Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves". The Mineral Resource Estimate was detailed in ASX announcement: "Major Resource Upgrade at Aura Energy's Tiris Project" 14th February 2023.  Aura confirms that it is not aware of any new information or data that materially affects the information included in this announcement regarding the mineral resources and that all material assumptions and technical parameters underpinning the estimates continue to apply and have not materially changed.