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1Investor PresentationBoss Energy. A global multi-mine Uranium producer A global multi- mine Uranium producer. ASX: BOE OTCQX: BQSSFbossenergy.com 15 September 2026 Boss Energy - Market Day
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2Investor PresentationBoss Energy. A global multi-mine Uranium producer Disclaimer and Important Notices This investor presentation (“Presentation”) has been prepared by Boss Energy Limited (ACN 116 834 336) (“Boss Energy”, “Boss” or “Company”). NOT INVESTMENT ADVICE This Presentation does not constitute in any way an offer or invitation to subscribe for securities in Boss Energy pursuant to the Corporations Act 2001 (Cth) and has not been lodged with the Australian Securities and Investments Commission. This Presentation does not constitute investment advice and has been prepared by Boss Energy without taking into account the recipient’s investment objectives, financial circumstances or particular needs. Each recipient must make his/her own independent assessment and investigation of Boss Energy and its business and assets when deciding if an investment is appropriate and should not rely on any statement or the adequacy and accuracy of any information. This Presentation is in summary form and is not exhaustive. This Presentation should be read in conjunction with Boss Energy’s periodic and continuous disclosure announcements lodged with the Australian Securities Exchange, which are available to download at www.asx.com.au. PAST PERFORMANCE Past performance information, including past share price performance of Boss and past Honeymoon Project information, given inthis Presentation is given for illustrative purposes only and should not be relied upon as (and is not) an indication of Boss’s (or anyone else’s) views on Boss’s future activities, guidance or financial performance or condition. Past performance of Boss cannot be relied upon as an indicator of (and provides no guidance as to) the future performance of Boss. FORWARD LOOKING STATEMENTS This Presentation contains certain forward-looking statements provided by or on behalf of Boss with respect to potential future matters. Forward-looking information may include, without limitation, statements regarding plans, strategies and objectives of Boss, production and financial guidance, financial forecasts, estimates of project milestones and timing and expected costs or production outputs. In some cases, forward-looking information can be identified by terms such as “may”, “will”, “should”, “expect”, “plan”, “anticipate”, “believe”, “intend”, “estimate”, “predict”, “potential”, “conti nue” or other similar expressions concerning matters that are not historical facts. Guidance as to production, unit costs and capital expenditure is based on assumptions, budgets and estimates existing at the time of assessment which may change over time impacting the accuracy of those estimates. These estimates are developed in the context of an uncertain operating environment including in respect of inflationary macroeconomic conditions,and uncertainties surrounding the risks associated with mining which may impact production and have a flow on effect on sales. Actual results may therefore vary significantly depending on these risks and the timing required to address them. Forward-looking statements reflect Boss’s expectations at the date of this Presentation, however they are not guarantees or predictions of future performance or statements of fact. Forward-looking information involves known and unknown risks, uncertainties and other factors (many of which are beyond the control of Boss and its directors and management) which maycause the actual results, performance or achievements of Boss and its business to be materially different from any future results, performance or achievements expressed or implied by the forward-looking information. Accordingly, unduereliance should not be placed on forward-looking information. The forward-looking statements in this Presentation reflect various assumptions by or on behalf of Boss (which assumptions may prove to be inaccurate). Accordingly, this is another reason why such statements are subject to significant business, technical, legal, economic and competitive and other uncertainties and contingencies and other factors which may bebeyond the control of Boss which could cause actual results or trends to differ materially from the forward- looking statements in this Presentation, including but not limited to differences or inaccuracies arising from price and currency fluctuations, geotechnical factors, geological and mining factors, estimated continuity of mineralised horizons, metallurgical and processing factors, sales factors, drilling and production results, development progress, operating results, mineral resource estimates, legal issues, legislative, fiscal and regulatory developments, economic and financial market conditions in various countries, approvals and cost estimates, environmental risks, ability to meet funding requirements, share price volatility, uranium markets and other matters. Accordingly, there can be no assurance that such forward-looking statements and projections will be realised. Boss makes no representations as to the accuracy or completeness of any forward-looking statements or projections or that any forecasts will be achieved. Additionally Boss makes no representation or warranty, express or implied, in relation to, and (to the maximum extent permitted by law) no responsibility or liability (whether for negligence, under statute or otherwise) is or will be accepted by Boss or by any of its officers, directors, shareholders, partners, employees, or advisers as to or in relation to the accuracy or completeness of the information, statements, opinions or matters (express orimplied) arising out of, contained in or derived from this Presentation or any omission from this Presentation. Boss does not undertake or accept any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements to reflect any change in Boss’s expectations or any change in events, conditions or circumstances on which any such statement is based, except as required by law. Mineral Resource estimates are necessarily imprecise and depend on interpretations and geological assumptions, minerals prices, cost assumptions and statistical inferences (and assumptions concerning other factors, including mining, processing, metallurgical, infrastructure, economic, marketing, legal, environmental, social and governmental factors) which mayultimately prove to be incorrect or unreliable. Mineral Resource estimates are regularly revised based on actual exploration or production experience or new information and could therefore be subject to change. In addition, there are risks associated with such estimates, including (among other risks) that minerals mined may be of a different grade or tonnage from those in the estimates and the ability toeconomically extract and process the minerals may become compromised or not eventuate. Accordingly, this is another reason why no assurances can be given of whether the production guidance, financial forecasts orother forecasts or other forward-looking statements or information in this Presentation will be achieved.
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3Investor PresentationBoss Energy. A global multi-mine Uranium producer Disclaimer and Important Notices CURRENCY AND EFFECT OF ROUNDING All dollar (“$”) amounts are in Australian dollars unless otherwise stated. All cost forecasts are in real 2026 terms. A number of figures, amounts, percentages, estimates, calculations of value and fractions in this Presentation are subject to the effect of rounding. Accordingly, the actual calculation of these figures may differ from the figures set out in this Presentation. MINERAL RESOURCE ESTIMATES The information in this Presentation that relates to the Mineral Resource estimate for the Honeymoon Deposit was reported in an announcement by the Company dated 27 August 2026 titled “Honeymoon New Feasibility Study and MRE Update”. The information in this Presentation that relates to the Mineral Resource estimate for Gould’s Dam and the Jason's Deposit was reported in an announcement by the Company dated 19 March 2026 titled “Gould’s Dam and Jason's Deposit Mineral Resource and Permitting Update.” The Company confirms that it is not aware of any new information or data that materially affects the information included in the original market announcements referred to above and that all material assumptions and technical parameters underpinning the Honeymoon Deposit, Gould’s Dam and Jason's Deposit Mineral Resource estimates in the original market announcements referred to above continue to apply and have not materially changed. PRODUCTION TARGET AND FORECAST FINANCIAL INFORMATION The information in this Presentation that relates to the production target (and forecast financial information derived from the production target) for the Honeymoon Deposit was reported in an announcement by the Company dated 27 August 2026 titled “Honeymoon New Feasibility Study and MRE Update.” The Company confirms that all the material assumptions underpinning the production target and forecast financial information derived from the production target in that announcement continue to apply and have not materially changed. The production target and forecast financial information for the Honeymoon Deposit referred to in this Presentation is based on 65% Indicated Mineral Resources and 35% Inferred Mineral Resources over the 9-year life of mine. The first 4 years of the production target is underpinned by 89% Indicated Mineral Resources and 11% Inferred Mineral Resources. There is a low level of geological confidence associated with Inferred Mineral Resources and there is no certainty that further exploration work will result in the determination of Indicated Mineral Resources or that the production target will be realised. The Company believes that it has a reasonable basis for providing the production target and forward-looking statements in this Presentation announcement as the Inferred Mineral Resources are not the determining factor in project viability (noting, most significantly that Honeymoon is already in production). Refer to Section 12 of the New Feasibility Study (attached to the Company’s announcement dated 27 August 2026 titled “Honeymoon New Feasibility Study and MRE Update.”) for the material assumptions underpinning the production target and forecast financial information. ASPIRATIONAL STATEMENTS The statements which appear throughout this announcement regarding the aspiration for the Honeymoon Processing Hub to produce2.5M lbs U₃O₈ at an AISC of A$65/lb (US$45/lb) by the early 2030s are aspirational statements and not a Production Target. The Company does not yet have reasonable grounds to believe these statements can be achieved. In particular, the statements are aspirational because: 1. whilst the Company has undertaken various internal studies on the Gould's Dam deposit and Jason's Deposit, the Company has not yet completed a Scoping Study or a Feasibility Study or published a Production Target for Gould’s Dam or Jason's Deposit. Substantial further work is required before such a Scoping Study, Feasibility Study or Production Target could be completed or published; and 2. the aspiration is dependent on integrating the Gould’s Dam and Jason's Deposit with the existing Honeymoon Mine operations. This remains subject to a number of variables, including: further drilling and resource definition; hydrogeological, metallurgical and wellfield performance; success of the wide-spaced wellfield design which is still currently being tested at Honeymoon; ISR recovery assumptions; selection and implementation of transport and processing methods, including the proposed Jason's Deposit trunkline and Gould’s Dam resin or eluate trucking options; Honeymoon plant and infrastructure capacity and upgrades; and obtainment of applicable regulatory and environmental approvals. Accordingly, there is no certainty that the aspiration will be achieved.
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4Investor PresentationBoss Energy. A global multi-mine Uranium producer Presenters and Q&A Deep operational, technical and corporate expertise Managing Director and Chief Executive Officer Matt Dusci Managing Director of Numerco Limited Scott Lawrence Chief Financial Officer Justin Laird General Manager Conrad Wilkins Head of Technical Services and Planning Olivier Regnault Agenda 1. Overview + Strategy Matt Dusci 2. Market Scott Lawrence 3. Sales Justin Laird 4. Capital Management Justin Laird 5. People Matt Dusci 6. Honeymoon Operations Conrad Wilkins 7. Wellfields Olivier Regnault 8. Gould’s Dam + Jason's Deposit Matt Dusci 9. Alta Mesa Matt Dusci 10. Closing Matt Dusci Principal Geologist (RSC) Guillaume Lorilleux General Counsel Kathryn Walker
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5Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer Business Overview & Strategy Investor Presentation 5
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6Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer Boss Energy An established producer: Honeymoon provides an operating mine, processing infrastructure and workforce from which to build Uniquely positioned to drive shareholder value Foundations in place – turning this into reliable performance, growth and shareholder value Specialist capability: Our combined uranium operating experience and technical ISR expertise support better decisions and de-risk future opportunities Financial strength and flexibility: Strong balance sheet and strategic uranium inventory Pathway for growth: Potential for low- capital growth across the asset portfolio Exposure to uranium opportunity: Our production base, inventory and uncontracted position provide exposure to tightening uranium market
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7Investor PresentationBoss Energy. A global multi-mine Uranium producer Building a reliable, lower-cost, long-life uranium business Business Strategy Business Strategy Building a reliable, lower-cost, long-life uranium business Honeymoon — an organic pipeline of deposits with established infrastructure Safe, reliable and predictable production from the wide- spaced wellfield design, underpinned by operational excellence. Deliver and Optimise Honeymoon Produce from Jason's Deposit and Gould’s Dam, leveraging Honeymoon’s installed processing infrastructure — three deposits, one plant. Build the Regional Production Hub Increase the known Mineral Resource and systematically explore for new ISR- amenable deposits across the region to further leverage established infrastructure. Grow the Resource & Discovery Pipeline Key Enablers Our People Our Technical & Operational Expertise Our Culture Ensure other assets in the portfolio achieve an acceptable return on capital. Maximise and Optimise the existing portfolio Beyond Honeymoon
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8Investor PresentationBoss Energy. A global multi-mine Uranium producer Deliver and Optimise Honeymoon 1. Refer to ASX announcement 27 August 2026 “Honeymoon New Feasibility Study and MRE Update” 2. Refer to the "Production Target and Forecast Financial Information" section of the"Disclaimer and Important Notices" sectionof this Presentation for further information. Honeymoon New Feasibility Study1 The Challenge The EFS design assumptions no longer reflected the orebody. The cost reset Incremental savings could not unlock the lower-grade resource. The pathway forward Wider spacing changes the economics of wellfield development. Facing the challenge built the capability and urgency that reset our cost structure and materially improved our understanding 13.8 Mlbs Planned U₃O₈ production Nine years operating period to 20352 A$50 / A$79 C1 / AISC per lb Life-of-mine averages to 20342. 01 02 03 • ~A$30/lb lower like-for-like AISC • ~28% higher PLS grade • ~50% less wellfield infrastructure • Cost base enables a lower cut-off grade Step-change in economics
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9Investor PresentationBoss Energy. A global multi-mine Uranium producer Build the Regional Production Hub Lower costs change how we view the mineralised system The opportunity at Gould’s Dam and Jason's Deposit is defined by the cost of recovering ISR-amenable uranium, not by grade alone Key learning from Honeymoon Wide-spaced ISR lowers the cost to recover each pound • Fewer wells • less infrastructure • more effective leaching New development lens System scale + ISR amenability Grade, permeability, recovery and cost assessed together 45.1Mlbs1 2× Honeymoon’s mineral resource Gould’s Dam + Jason’s Deposit Gould’s Dam and Jason's Deposit should be viewed as significant mineralised systems — not simply as lower-grade satellite resources. Reducing the cost threshold has the potential to convert a broader portion of these systems into economic development opportu nities. Strategic Implication 1. Refer to Appendix 1 for further details of Mineral Resource classification for Gould’s Dam and Jason's Deposit
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10Investor PresentationBoss Energy. A global multi-mine Uranium producer One plant, three deposits Build the Regional Production Hub 3 deposits Honeymoon, Gould’s Dam and Jason's Deposit feeding a single plant 65.9Mlbs Combined mineral resource across the three deposits2 1 processing hub Honeymoon plant, utilities and workforce already in place 1. Refer to the “Aspirational Statements” section in the "Disclaimer and Important Notices" section of this presentation. 2. Refer to Appendix 1 for further details of Mineral Resource classification for Gould’s Dam, Jason's Deposit and Honeymoon Satellite deposits, one plant — more pounds, minimised new infrastructure • Low-capital growth Latent back-end capacity lifted with minimal capital • Longer mine life Gould’s Dam and Jason's Deposit extend beyond the NFS • Operating synergies Fixed costs spread over more pounds — aspiration for the AISC to be ~A$12/lb lower than the NFS by the early 2030s1 • Higher sustained output Hub aspiration of 2.5Mlbs a year at A$65/lb AISC by the early 2030s1 • Staged capital Spend phases in as each deposit starts • Resilient supply Feed from three orebodies, not one Loaded Resin Trucked Gould’s Dam – loaded resin 33.1Mlbs resource, resin trucked ~75km — no long-distance pipelines New Trunkline + Intermediate Storage Honeymoon Processing Hub Jason's Deposit – new trunkline 12.0Mlbs resource, 13km twin trunkline to Honeymoon
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11Investor PresentationBoss Energy. A global multi-mine Uranium producer Production and costs could be meaningfully improved Build the Regional Production Hub 2.5 Mlbs p.a. Aspirational hub rate by the early 2030s, using installed back-end capacity1 1.3Mlbs 1.9Mlbs 2.5Mlbs A$88/lb US$62/lb A$77/lb US$54/lb A$65/lb US$45/lb - 10 20 30 40 50 60 70 80 90 100 - 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 FY27 Honeymoon only Early 2030's Honeymoon (NFS) Early 2030's Production Hub at NFS spacing Kazatomprom 2026 AISC guidance range Early 2040s A$65 /lb (US$45/lb) Aspirational AISC at hub scale by the early 2030s, on the NFS cost structure1 ~A$12 /lb lower Aspirational unit cost reduction by the early 2030s from fractionalising fixed costs 1 • A robust foundation The NFS provides a robust foundation for Honeymoon and pathway for value creation at Jason's Deposit and Gould’s Dam. • A step change in performance Aspiration is to materially increase production, lower unit costs and extend mine life beyond the Honeymoon-only plan. • Optimise three production sources Integrate all three deposits through a regional operating and processing hub to increase utilisation of existing infrastructure. Honeymoon only Production hub aspiration AISC (A$/lb)Aspiration Rate and AISC by Development Stage1 1. Refer to the “Aspirational Statements” section in the "Disclaimer and Important Notices" section of this presentation.
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12Investor PresentationBoss Energy. A global multi-mine Uranium producer The foundations of our success Strategy enablers Building a lasting competitive advantage through the strength of our team and our culture Our people, technical capability and culture underpin delivery of our strategy Our People Our technical & operating capability Our Culture • Renewed Board and leadership, with deep industry experience • Building depth across technical and operational teams • Developing our people to support the next phase of growth • Integrated ISR expertise, from geology through to processing • Operating data and modelling inform better decisions • Applying Honeymoon learnings to optimisation and satellite growth • Safety and care for our people at the centre of every decision • One team, with clear ownership and accountability for delivery • Challenging assumptions and learning to improve performance
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13Investor PresentationBoss Energy. A global multi-mine Uranium producer Focused on value creation Capital discipline and shareholder value Plan is to grow in production, operating margins and long-term value while being strategic on capital deployment. Ensure margins are generated Focused on the generation of margin and costs – have laid a new foundation for the business through the NFS Remain leveraged to tightening uranium market Remain strategically uncontracted with significant uranium inventory Leverage existing capital – low capital cost growth Maximise the contribution of Honeymoon’s processing infrastructure and operating capability – ensuring low capital growth pathway Commit capital where it earns a return Stage wellfield investment and satellite development as technical confidence and approvals advance Operational Excellence & Business Resilience A culture of continuous improvement and delivery to plan 01 02 03 04 05
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14Investor PresentationBoss Energy. A global multi-mine Uranium producer Uranium Market Outlook 14Investor PresentationBoss Energy. A global multi-mine Uranium producer Macro Trends and Micro Factors
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15Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer Micro Uranium Market Economics The Macro Market Backdrop Prevailing Conditions and Relative Economics Maturing Market Technology Growth in Transaction Transparency Feedback from WNA Symposium The Wider Outlook Micro Uranium Market Economics Micro Market Drivers - The Evolution
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16Investor PresentationBoss Energy. A global multi-mine Uranium producer Macro Picture U3O8 demand is set to outrun supply 0 100 200 300 400 500 600 2025 2040 2040 Reference 2040 Upper World reactor requirements, million lbs U3O8 per year 3.1bn lbs of cumulative utility uranium requirements are uncovered by contracts to the end of 2045. UxC, via Cameco, 2026 2030s the decade today's top-producing mines deplete — while new mines now take 10–20 years to develop. WNA; ConverDyn, 2025 90% of 2024 reactor demand was met by mined supply — the rest drawn from finite, shrinking secondary sources. World Nuclear Association, 2025 179 278 390 531 World Nuclear Association, 2025
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17Investor PresentationBoss Energy. A global multi-mine Uranium producer Macro Picture, Market Fundamentals Mine supply is concentrated, constrained and ageing 0 20 40 60 80 100 120 140 160 180 200 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 World uranium mine production, million lbs U3O8 per year WNA production data (tU, converted at 2,600 lbs U3O8/tU). 2024 output of 60,213 tU met just 90% of reactor requirements (2023: 83%; 2020-2022: 74-76%) — the balance came from finite secondary supplies. 77 Mlbs Kazatomprom’s reduced 2026 production quota (from 85 Mlbs) — with willingness to flex a further 20% lower. Kazatomprom, via Sprott, 2026 Mid-2030s when existing mines face resource depletion — while new mines now take 10-20 years to develop. WNA Nuclear Fuel Report 2025, ConverDyn 75% Of world production comes from just three countries — Kazakhstan (39%), Canada (24%) and Namibia (12%). World Nuclear Association, 2024 data Sources: World Nuclear Association, World Uranium Mining Production (2024 data) & Nuclear Fuel Report 2025. Sprott, Uranium Outlook 2026. ConverDyn via World Nuclear News (2025) 164157 157 141 142 124 124 129 142 157
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18Investor PresentationBoss Energy. A global multi-mine Uranium producer Macro Picture, Market Fundamentals The gap between demand and mined supply 0 50 100 150 200 250 300 350 400 2022 2024 2040 Reference Reactor requirements vs mine production, million lbs U3O8 per year Reactor requirements Mine production 233 Mlbs/yr by which 2040 Reference demand (390 Mlbs) exceeds today’s entire annual mine output (157 Mlbs). Derived from WNA, 2025 3.1bn lbs of cumulative utility uranium requirements are uncovered by contracts to the end of 2045 UxC, via Cameco, 2026 116 vs 185 Mlbs placed under long-term contract in 2025, against ~185 Mlbs consumed annually — contracting below replacement rate. Cameco; Sprott 2026 2022 and 2024: WNA actuals (production, and requirements implied by WNA’s stated 78% / 90% mine-supply coverage). 2040: WNA Reference Scenario demand vs mine output held at today’s level for scale — WNA expects existing mines to deplete from the mid- 2030s, so output without new mines would be lower still. 165 129 157174 157 390
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19Investor PresentationBoss Energy. A global multi-mine Uranium producer Consumption Lead Time The Front-End Nuclear Fuel Cycle Mining & Milling Uranium ore is mined and milled into yellowcake. 01 Conversion U3O8 is purified and converted to UF6 gas. 02 Reactor Assemblies are loaded into the core to generate electricity. 05 Fuel Fabrication Enriched uranium becomes UO 2 pellets in fuel assemblies. 04 Front End CompleteFabricated Fuel Enrichment U-235 is raised from 0.7% to 3-5% in centrifuges. 03 EUP - $/SWUUF6 - $/KgUU3O8 - $/lb
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20Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer Sales Strategy Investor Presentation 20
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21Investor PresentationBoss Energy. A global multi-mine Uranium producer Marketing & Offtake Deliberately under-contracted 73% of inventory and forecast NFS life-of-mine production is uncontracted, with forward sales executed on a rolling forward basis. Life-of-mine contract position 73% Uncontracted 16% Contracted 11% Inventory on hand Strategically under-contracted Only 16% of total inventory and LOM production is committed, which is mostly covered by inventory on hand, preserving substantial exposure to a rising spot price. Forward sales Uncommitted pounds are sold on a forward basis, giving Boss greater control over timing of sales. Inventory as optionality 1.58Mlbs2 of drummed inventory adds timing flexibility and further leverage to price. Marketing strategy Calendar Year $60 $80 $100 $120 $140 2027 57 75 91 105 119 2028 57 76 94 111 127 2029 57 76 95 112 129 2030 58 77 96 113 130 2031 58 77 95 112 129 2032 59 78 98 117 136 2033 60 80 100 120 140 Weighted Average Realised Price (US$/lb) 1. Life-of-mine production based on production from Honeymoon only as set out in the NFS. Excludes aspirational production from Gould’s Dam and Jason's Deposit 2. As at 30 June 2026.
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22Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer Capital Framework Investor Presentation 22
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23Investor PresentationBoss Energy. A global multi-mine Uranium producer Capital Management A disciplined capital allocation framework 1.Balance sheet metrics as at 30 June 2026. 2.1.581Mlbs at UxC spot rate on 29 June 2026 of US$84.75 and AUD:USD of 0.6869 Ongoing transition to wide-spaced wellfield design to be funded organically. Capital allocation framework Operations Value-accretive wellfield development Acceleration of satellite resources Maintain cash working capital balance Inventory movements 01 02 03 04 05 Hold cash as a working capital balance. Cash Target Range Wellfield capital is committed only where returns are accretive. Value-Accretive Wellfields Adjust inventory based on market conditions and capital requirements. Realise additional value e.g. inventory loan. Inventory Movements The transition to wide-spaced wellfield design is funded from operations. Organic Funding Bring satellite deposits forward to fractionalise fixed costs and realise value. Accelerate Satellite Resources Debt Free No borrowings; balance sheet undrawn $207M Cash, inventory and liquid assets at book value1 $195M Inventory at market value2 vs $116M at book value1
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24Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer Our People Our Team 24Investor Presentation
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25Investor PresentationBoss Energy. A global multi-mine Uranium producer Our team People are key - building deeper capability A renewed Board, a strengthened leadership team and deeper technical expertise across the organisation. A largely new team We have brought together new perspectives, deeper expertise and extensive uranium operating experience — building capability across the organisation, not around individuals. Building a strong team is central to delivering our strategy — and will be an enduring competitive advantage for Boss. Renewed Board leadership Incoming Chair Peter Botten, brings extensive resources sector, operational and capital markets experience. 01 A strengthened leadership team New appointments have established greater operational accountability, commercial discipline and focus on execution. 02 Deeper technical capability Materially strengthened our technical capability. 03 One team focused on delivery A collaborative, accountable and performance-focused culture — the strength of our people and how we work together. 05 Experience in decision making The depth and diversity of the new team strengthens decision- making, develops our people and lifts capability across the organisation 04 TECHNICAL Uranium Hydrogeology CAPABILITY CULTURELEADERSHIPBOARD Geology Geochemistry PlanningProcessing Wellfield
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26Investor PresentationBoss Energy. A global multi-mine Uranium producer Our people Snapshot of our team Leadership Gender profile Technical qualifications Experience by organisation Residential location 46% New in Leadership Roles over past 12 months 21% Female 22% hold University Degrees 35% prior ISR/ Uranium Experience 88% South Australian Based 46% 140 Total workforce 35% Prior ISR / uranium experience (49) 22% Hold a technical degree (31) 88% South Australia based (123) New leadership, highly technical organisation with deep uranium and ISR expertise 21% 22% 35% 88% Existing (54%) New (46%) Geology / Hydrogeology (52%) Chemical Eng. / Chemistry (32%) Mechanical / Civil Eng. (10%) Environmental Science (6%) Male (78.6%) Female (20.7%) Heathgate (40%) BHP (35%) Other uranium / ISR (16%) Multiple organisations (9%) South Australia 123 (87.9%) Other states / overseas 17 (12.1%)
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27Investor PresentationBoss Energy. A global multi-mine Uranium producer The Boss Leadership Team Deep operational, technical and corporate expertise Chief Executive Officer and Managing Director Joined Sep 2024 Chief Financial Officer Joined Mar 2024 General Counsel Joined Aug 2026 General Manager Joined Sep 2025 Head of Technical Services and Planning Joined Sep 2025 Matt is an accomplished mining executive with over 25 years experience. For the past 10 years, prior to joining Boss Energy, Matt held several executive positions at IGO Limited. These included Acting CEO, Chief Operating Officer and Chief Growth Officer. He joined Boss Energy in September 2024 and was appointed Managing Director and Chief Executive Officer in October 2025. Building quality leadership teams A largely new leadership team combining deep operational, technical and corporate expertise – building the capacity to deliver Boss Energy’s Strategy Matt Dusci Justin Laird Kathryn Walker Conrad Wilkins Olivier RegnaultPositioned for delivery and growth Justin was previously Manager Business projects at Wesfarmers where he held several senior positions in business development, leading transaction and finance teams, scaling new businesses, and other commercial and strategic roles. Justin, who is a Chartered Accountant, commenced his career at EY and also worked in capital investment and strategic finance roles at Vodafone Ireland. Kathryn joined Boss Energy in August 2026 and has more than 20 years experience advising on complex major projects across the energy, infrastructure and natural resources sectors, spanning approvals, land access, contracting and operations. She was previously General Counsel at Symphony Infrastructure Partners and a partner at Piper Alderman and is a Graduate of the Australian Institute of Company Directors. Conrad is a Chartered Engineer and Fellow of the Australian Institute of Mining & Metallurgy. Conrad joined Boss Energy from WGA in Adelaide, where he worked as Process Technical lead and has over 20 years of Process Engineering experience with a strong focus on project and design management. Conrad’s experience includes operating experience at Beverley Uranium Operation and Olympic Dam. Olivier joined Boss Energy in September 2025 and holds a PhD in Hydrogeology and Geochemistry. He has over 15 years experience in mining operations across Kazakhstan, France, Canada and Africa and is a technical expert in uranium in-situ leach, mine planning and advanced modelling.
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28Investor PresentationBoss Energy. A global multi-mine Uranium producer Leadership The Board Non-Executive Chair (stepping down 30 Sep 2026) Chair since Mar 2023; NED since Oct 2020 Non-Executive Chair-elect (from 1 Oct 2026) Chair from Oct 2026 Chief Executive Officer and Managing Director Commenced Oct 2025 Non-Executive Director Commenced June 2025 Non-Executive Director Commenced June 2025 Substantial board and governance renewal over the past 12 months. • Peter Botten (Chair-elect) – End Sep 2026 • Matt Dusci (CEO & MD) - Oct 2025 • Caroline Keats (NED) – Jun 2025 • Joanne Palmer (NED) – Jun 2025 A complementary Board combining proven resources leadership, operational experience, financial discipline and strong governance. Wyatt Buck Peter Botten Matt Dusci Caroline Keats Joanne Palmer • 15 years at Cameco, including GM of McArthur River Mine and Key Lake Mill • Senior operational roles at Paladin Energy • Operations Director, First Quantum Minerals, 2011–2020 • 35+ years as a resources executive and director • Managing Director of Oil Search 1994– 2020, delivering the PNG LNG Project • Non-Executive Chair of Conrad Asia Energy and Karoon Energy • 25+ years as a mining executive • Acting CEO, COO and Chief Growth Officer at IGO • Joined Boss Energy in 2024; CEO and MD from Oct 2025 • 20+ years of corporate and commercial experience • Senior executive and Managing Director roles in listed companies • Expertise in legal, financing, government relations and off-take • 28+ years in audit and assurance, including 19 years at EY • Resources sector focus across the UK, Africa, Europe, the Americas and Australasia • Advises multinationals, mid- caps and junior explorers
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29Investor PresentationBoss Energy. A global multi-mine Uranium producer Experienced operational, technical and functional leaders delivering at Honeymoon Adylbek Joldassov Wellfields Manager Joining – Nov 2026 Steve Telford Process Manager Joined – Sep 2025 Sean Chipman Health and Safety Superintendent Joined - Jan 2026 Sara Avory Environment and Radiation Superintendent Joined – June 2023 Sarah Barter People and Culture Superintendent Joined – Oct 2025 Adylbek joins Boss Energy from Katco in Kazakhstan, where he held the position of Head of Mining Extraction, ISR. Adylbek holds a Masters Degree in Chemical Engineering and has over a decade of hands-on ISR Uranium expertise. Steve has over 20 years experience in mining and mineral processing. He holds a Bachelor of Engineering (Chemical) and joined Boss Energy in September 2025. Steve has worked for Heathgate Resources and BHP’s Olympic Dam and held several complex technical and leadership roles. Sean has over 20 years experience across several industries in Australia, with demonstrated experience in leading organisational safety culture transformation, legislative compliance, safety governance, risk management and workforce capability development. Sean joined Boss Energy in January 2026. Sara has two decades of experience in environmental and radiation management and regulatory reporting and holds a Bachelor of Applied Science (Environmental Science). Sara has worked for Heathgate Resources and Iluka’s Jacinth Ambrosia mine site. Sarah is an experienced People & Culture leader with over 20 years success across resources, manufacturing and professional services sectors. She specialises in workforce planning, talent acquisition, employee relations, organisational change and culture development, partnering with leaders to build high- performing, engaged teams. She holds a Bachelor of Arts and qualifications in Training and Business. Alex Baum Projects Superintendent Joined - Apr 2025 Alex holds a Masters degree in Engineering and joined Boss Energy in April 2025. He has extensive engineering design, construction and project management experience. Honeymoon Operational Expertise A largely new operational leadership team assembled over the past 12 months • Complementary capability across wellfields, processing, projects, safety, environment and people • Deep uranium and ISR experience gained in Australia and internationally • Combining technical expertise with practical operating and project-delivery experience • Working as one team to strengthen execution, develop our people and deliver safe, reliable production
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30Investor PresentationBoss Energy. A global multi-mine Uranium producer Experienced operational, technical and functional leaders delivering at Honeymoon Olivier Regnault • Wellfields Technical Lead (PhD Hydrogeologist/ Geochemist) Previous – Orano (Global) Adylbek Joldassov • Wellfields Manager (Master – Chemical Engineer) Previous – Katco (Kazakhstan) Matt Williams • Wellfields Superintendent (Hydrogeologist) Ryan Gore • Principal Wellfields Geologist (Geologist) Previous - Heathgate Kittiya Bushaway • Hydrogeologist (Master – Groundwater Hydrology) Previous – Rio Tinto Conrad Wilkins • GM - Honeymoon (Process Engineer) Previous – WGA/Heathgate Steve Telford • Process Manager (Chemical Engineer) Previous – Heathgate / BHP Caren Kosgei • Senior Process Engineer (Masters Chemical Engineer) Brendan O’Carroll • Process Engineer (Chemical Engineer) Previous - WGA Kade Morris • Process Engineer (Chemical Engineer) Some of our Technical Capabilities Experienced chemical engineers with uranium operating and project experience ISR expertise gained across Australia and internationally
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31Investor PresentationBoss Energy. A global multi-mine Uranium producer Our unique values developed by our people Our five values that make us Boss Energy Do What’s Right BEHAVIOUR This means: Respect for everyone. Integrity in every call. Care in action. 01 All in together BEHAVIOUR We share the load, share the goal, and share the win. 02 Own, Deliver & Celebrate BEHAVIOUR We aim high, own the outcome, and when we hit the mark, we celebrate it. 03 Think Big, Act Bold BEHAVIOUR We back our convictions, take the brave step, and lift our eyes to what’s next. 05 Break new ground BEHAVIOUR Standing still isn’t in our DNA. Every day we push to be better than yesterday. 04 OUTCOME Integrity tells us what to do. Respect tells us how. Care tells us why. Ultimately, we do what is right. OUTCOME At Boss, the sum is always greater than the part. We deliver because we do it together. OUTCOME At Boss, we want our work to matter, our results to count, and our successes to be celebrated OUTCOME At Boss, courage is how belief becomes action. We dare to think differently because the change we want begins with us. OUTCOME At Boss, curiosity is how we grow. We try, we learn, and we get better continuously.
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32Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer 32Investor Presentation Honeymoon Operation
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33Investor PresentationBoss Energy. A global multi-mine Uranium producer A strategic producing asset and well located to be a processing hub Location South Australia, approximately 80 km north-west of Broken Hill 1.41Mlbs Produced in FY26 Operation In-situ recovery (ISR) with continuous ion exchange processing Operating History Restarted April 2024; commercial production January 2025 Our People 115 employees, supported by an experienced uranium corporate and technical team Mine Life Nine-year mine plan established by the Honeymoon New Feasibility Study Honeymoon Operation
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34Investor PresentationBoss Energy. A global multi-mine Uranium producer Honeymoon Operational Expertise Honeymoon – Site Adylbek Joldassov Wellfields Manager Joining – Nov 2026 Steve Telford Process Manager Joined – Sep 2025 Sean Chipman Health and Safety Superintendent Joined - Jan 2026 Sara Avory Environment and Radiation Superintendent Joined – June 2023 Sarah Barter People and Culture Superintendent Joined – Oct 2025 Adylbek joins Boss Energy from Katco in Kazakhstan, where he held the position of Head of Mining Extraction, ISR. Adylbek holds a Masters Degree in Chemical Engineering and has over a decade of hands-on ISR Uranium expertise. Steve has over 20 years experience in mining and mineral processing. He holds a Bachelor of Engineering (Chemical) and joined Boss Energy in September 2025. Steve has worked for Heathgate Resources and BHP’s Olympic Dam and held several complex technical and leadership roles. Sean has over 20 years experience across several industries in Australia, with demonstrated experience in leading organisational safety culture transformation, legislative compliance, safety governance, risk management and workforce capability development. Sean joined Boss Energy in January 2026. Sara has two decades of experience in environmental and radiation management and regulatory reporting and holds a Bachelor of Applied Science (Environmental Science). Sara has worked for Heathgate Resources and Iluka’s Jacinth Ambrosia mine site. Sarah is an experienced People & Culture leader with over 20 years success across resources, manufacturing and professional services sectors. She specialises in workforce planning, talent acquisition, employee relations, organisational change and culture development, partnering with leaders to build high- performing, engaged teams. She holds a Bachelor of Arts and qualifications in Training and Business. A largely new operational leadership team assembled over the past 12 months • Complementary capability across wellfields, processing, projects, safety, environment and people • Deep uranium and ISR experience gained in Australia and internationally • Combining technical expertise with practical operating and project-delivery experience • Working as one team to strengthen execution, develop our people and deliver safe, reliable production Alex Baum Projects Superintendent Joined - Apr 2025 Alex holds a Masters degree in Engineering and joined Boss Energy in April 2025. He has extensive engineering design, construction and project management experience.
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35Investor PresentationBoss Energy. A global multi-mine Uranium producer One of only three producing uranium mines in Australia One of only two ISR mines in Australia Successful restart of Honeymoon Operation with first production April 2024 Honeymoon Operation The majority of the capital is in place with 5 NIMCIX columns operational ✓ ✓ ✓ ✓
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36Investor PresentationBoss Energy. A global multi-mine Uranium producer Honeymoon Operation History and Key Operational Milestones Uranium drummed (MLBS U₃O₈) 2.31 Mlbs U₃O₈ drummed since restart — 6 wellfields, 5 IX columns and 1 trunkline commissioned FY24 • April 2024 First drum of uranium since restart, on IX Column 1 and Kiln 1 0.029 Mlbs • June 2024 Column, centrifuge and kiln operating in automated mode • September 2024 Wellfield B2 and IX Column 2 commissioned FY27 • August 2026 EKT1, the first wide-spaced hybrid wellfield, commences flushing 1.25-1.30 Mlbs Guidance • FY27 guidance 1.25-1.30 Mlbs, held flat while EKT1 tests wide-spaced hybrid design FY25 • January 2025 Commercial production achieved; Centrifuge 1 and Kiln 2 commissioned 0.873 Mlbs • March 2025 Wellfield B3 and IX Column 3 commissioned • June 2025 First full year of production — guidance surpassed at 871 klbs drummed FY26 • February/March 2026 Production interrupted by weather event — 26 days lost 1.407 Mlbs • Q2 FY26 Record quarterly production — 456 klbs drummed • April–June 2026 IX Columns 4 and 5 commissioned; Wellfield B6 operational through East Kalkaroo trunkline
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37Investor PresentationBoss Energy. A global multi-mine Uranium producer Honeymoon Operation Processing hub with long term life of mine Hub The processing plant is the hub of the operation Progressive development Wellfields progressively developed around the plant Existing infrastructure New wellfields connect to established infrastructure
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38Investor PresentationBoss Energy. A global multi-mine Uranium producer Honeymoon Operation – Processing Plant Proven processing technology with up to 2.5Mlb capacity Elution, precipitation and thickening Loaded resin is eluted to strip the uranium into a concentrated solution, which is then precipitated and thickened to produce a uranium slurry. Drying and packing The slurry is dewatered by centrifuge and calcined in the kilns to produce a dense uranium oxide, which is drummed on site ready for dispatch to customers. Lixiviant and ion exchange Uranium-bearing pregnant lixiviant is pumped from the wellfields to the plant, where NIMCIX columns load uranium onto resin and the barren solution is returned to the wellfields.
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39Investor PresentationBoss Energy. A global multi-mine Uranium producer Honeymoon Operation Key Stages of the Operation Wellfield In-situ Leach Acidified lixiviant is injected into the uranium-bearing sands. Uranium dissolves and the pregnant solution is pumped to surface through extraction wells. Flow Constrained Uranium Pounds Constrained One continuous ISR circuit — no crushing, no grinding, no tailings dam Resin Loading NIMCIX continuous ion exchange technology uses synthetic resin beads to capture and concentrate the uranium solution. In the first stage, the uranium from the pregnant solution is absorbed on the resin beads. Logistics The containers are road freighted from Honeymoon for shipping to conversion facilities overseas. Resin Recharge In the second stage, the loaded resin is then stripped of uranium during the elution process with saline water. Precipitation Precipitation of uranium from solution to convert back into solid form. Honeymoon uses hydrogen peroxide precipitation method which produces a very pure product Uranyl Peroxide (Yellowcake) in slurry form. Drying & Calcination The Yellowcake is washed and dewatered through centrifuges before calcination via electric kilns to U3O8 (Blackcake). Drumming & Packing U3O8 is placed into steel drums before being packed into shipping containers.
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40Investor PresentationBoss Energy. A global multi-mine Uranium producer Water Treatment Plant Plant and Supporting Infrastructure Key enabler of wellfield development - Supplies RO permeate for wellfield conditioning and process use; capacity and availability set the rate new wellfields come online. Established treatment process - Neutralisation, softening and reverse osmosis; permeate is reused across the plant and wellfields, with RO reject sent to the Liquid Disposal Pond. Eight wellfields per year - The life-of-mine plan assumes around eight new wellfields annually, each conditioned over approximately 45 days. Debottlenecking of Existing Plant - Debottlenecking the existing plant through pumped clarifier transfers, dosing and RO manifold upgrades and a new CIP system, lifting treated water to about 130 m³/h (target completion – Q4FY27). Second Water Treatment Plant - BLS bleed preconditioning plus a duplicate neutralisation and softening train lift RO feed to 300 m³/h, producing around 210 m³/h of permeate (target completion – Q3FY28). Optimisation of ramp-up - Wellfields have averaged around 0.7 pore volume equivalents of flushing against the 1 PVE assumed for NFS and options to accelerate development of the second water treatment plant.
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41Investor PresentationBoss Energy. A global multi-mine Uranium producer Proposed Upgrades and Plant Layout Upgrade Strategy Staged delivery - Stage 1 is being implemented in parallel with the Stage 2 study to lift permeate availability now; Stage 2 delivers the sustainable capacity required for the life-of-mine production schedule. • Clarifier overflow gravity launders converted to pumped transfer • Gypsum return line to the softener for seeding • Dosing systems upgrade • New RO manifold to increase RO feed capacity • RO turbocharger replacement • New clean-in-place system with high-flow backflushing • Additional raw-water supply • Increased liquid-disposal pumping and bore capacity • Operational Q4 FY27 Stage 1 — Existing Plant Optimisation Near-term debottlenecking; treated water to ~130 m³/h
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42Investor PresentationBoss Energy. A global multi-mine Uranium producer Proposed Upgrades and Plant Layout Upgrade Strategy Existing WTP • BLS bleed preconditioning and iron recovery circuit, reducing ferric sulphate imports • Duplication of neutralisation and softening unit operations • Increased supply from recovered process streams and raw water • Upgrades to water supply, residue management and liquid-disposal infrastructure • Operational Q3 FY28 Stage 2 — Major Capacity Expansion RO feed sustained at 300 m³/h, ~210 m³/h permeate Future Optimisation Indicative upgraded plant layout New neutralisation & softening train BLS bleed preconditioning / iron recovery RO plant Raw water & disposal bores
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43Investor PresentationBoss Energy. A global multi-mine Uranium producer Business Improvement Programs of work to improve operating costs and productivity Delivered Underway Reagent and chemistry Wellfields Processing circuit and availability Lixiviant optimisation Acid and oxidant dosing tuned to improve leaching Precipitation control logic Optimised control lifts yield and cuts reagent use Carbonate recycle in IX Recover and re-use carbonate from the IX circuit Direct reagent dose at wellhouse Dose at point of use to cut losses and reduce handling Ferric recovery Recycle ferric from bleed, offsetting consumption Reagent inventory management Smarter ordering and storage to reduce working capital Ferric availability and ORP control Stable oxidant levels sustain leach performance VSDs in wellfields Variable speed drives trim power and improve flow control First fill recovery Recover solution from initial wellfield fill Wellfield preparation Standardised drill and commissioning practice Infrastructure re-use Redeploy plant and pipework across new wellfields IX conversion cycle timing Optimised cycle length eliminates reagent waste Centralised filtration Single filtration point simplifies the flowsheet Capacity and reliability upgrades Minor capital to debottleneck capacity and lift availability Road access All-weather access reduces weather-related downtime
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44Investor PresentationBoss Energy. A global multi-mine Uranium producer Safety, Health and Wellbeing Continuous improvement in our safety culture Behaviours and Culture Safety Improvement TRIFR/LTIFR A genuine commitment to provide a safe, healthy and supportive workplace for all our people • Elevated TRIFR rates reflecting the safety maturity of the operation at Honeymoon (and relatively low hours worked). • Focus on improved reporting and transparency since transition to operations. • ISO 45001-aligned Health and Safety Management System in place. • Implemented online health, safety hazard and incident management system. • Focus on Safety Critical Risks and Control (prevention of high-consequence events). • Safety metric (both leading and lagging) targets are integrated into all KPI frameworks. • Direct leadership accountability with collective responsibility. • Learning and improvement culture (e.g. workforce safety committee, investigations, open reporting, corrective action management plans). 0 5 10 15 20 25 30 0 1 2 3 4 TRIFR# Honeymoon Injuries & TRIFR Recordable Injuries TRIFR - Rolling 12 month Average
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45Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer Wellfield design 45Investor Presentation
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46Investor PresentationBoss Energy. A global multi-mine Uranium producer From Flow and Reactivity to Uranium Recovery ISR Fundamentals Flow: Darcy controls transport Flow between injector and producer follows Darcy’s law. Permeability, hydraulic gradient and flow area control the flow rate, while porosity and well spacing influence travel time and contact with the reservoir. Chemistry: thermodynamics and kinetics control reaction Acid and oxidant react with the minerals encountered along the flow path. Thermodynamics determines which reactions can occur, while reaction kinetics and mineral availability control how rapidly acid is consumed and uranium is released.
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47Investor PresentationBoss Energy. A global multi-mine Uranium producer How do we determine an “optimal wellfield design”? Wellfield design Fundamentals By integrating reservoir geometry, hydraulics, resource distribution and geochemical reactivity, constrained by extensive field and production data The optimum design must balance all four components, despite spatial variability, uncertainties and limited direct observation 4 Uranium One wellfields (2011–2013) + 6 Boss Energy wellfields currently operating Extensive field characterisation and operating data allow this subsurface complexity to be captured and managed through calibrated reservoir modelling. A large operating data set is available: Where can the solution flow? How does the solution move? What uranium can the flow contact? How does the reservoir react? 1. Reservoir geometry 2. Hydraulics 3. Resource distribution 4. Geochemical reactivity Reservoir architecture, mineralised horizons, thickness, confinement and vertical connectivity. Permeability, porosity and hydraulic connectivity control flow distribution and residence time. Uranium grade and inventory vary spatially within the permeable reservoir. Reactive minerals control acid consumption, acidification efficiency and uranium dissolution.
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48Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Wellfield design Fundamentals What do we seek to determine? 48 The objective is to define the physical wellfield configuration and operating parameters best suited to the local reservoir characteristics 1. Pattern type 5-spot, 7-spot or locally adapted geometry. Reservoir modelling combines local reservoir characteristics and design parameters to test multiple scenarios, compare performance and determine the preferred wellfield design. Wellfield configuration 2. Pattern size Injector-to-producer spacing. 3. Well completion Screen length, position and management of stacked horizons. Operating conditions 4. Well flow rates Injection, production, pressure response and hydraulic balance. 5. Injection chemistry Acid and oxidant concentration.
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49Investor PresentationBoss Energy. A global multi-mine Uranium producer Reactive Transport Model A mature, widely used approach to complex subsurface systems Developed over more than four decades, RTM is used across environmental, energy and mining applications to couple fluid flow with geochemical reactions. 1980s Foundations Multi-component RTM frameworks emerge. 1990s Rapid development Major codes and industrial applications expand. 2000s Benchmarking & scale-up 3D models, code comparison and larger systems. TODAY Established practice Prediction and optimisation across industries. Honeymoon Application At Honeymoon, this proven approach is applied directly to field data to improve wellfield design and production forecasting Radioactive Waste Long-term radionuclide migration and repository performance Groundwater & Remediation Contaminant transport, natural attenuation and remediation design CO₂ Storage Plume migration, trapping and long-term geochemical behaviour Energy Reservoirs Fluid-rock interaction in geothermal, oil, gas and underground storage Mining & ISR Metal mobilisation, reagent demand, recovery and environmental performance
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50Investor PresentationBoss Energy. A global multi-mine Uranium producer Advanced ISR Mine Planning RTM links the resource model directly to wellfield performance and the life-of-mine schedule A time-dependent, three-dimensional framework converts local reservoir characteristics into wellfield-specific production responses 3D Resource Grade, thickness and uranium inventory Reactive transport model Hydrogeology Permeability, porosity and connectivity Geochemistry Mineralogy, acid and oxidant demand Operations Spacing, flow, screens and lixiviant chemistry Recovery Timing and cumulative extraction PLS Chemistry Uranium tenor, pH and redox Reagents Acid and oxidant consumption Mine plan Wellfield curves and production schedule Wellfield-specific forecasts replace generic recovery assumptions, providing a stronger technical basis for design and mine planning
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51Investor PresentationBoss Energy. A global multi-mine Uranium producer A digital twin of the reservoir Seeing inside the reservoir as the wellfield evolves The reactive transport model tracks how the uranium inventory is progressively contacted, dissolved and recovered throughout the three-dimensional reservoir The digital twin shows not only how much uranium is recovered, but where depletion occurs and where residual uranium remains within the reservoir. Initial Uranium Resource Wells positioned within theinitial uranium distribution Early resource depletion The most accessible uranium close to the active flow paths has been dissolved and recovered Residual uranium inventory Remaining uranium located in less accessible areas or outside the volume effectively contacted by the wellfield t = 0 t = 6 Months t = 18 Months
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52Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Calibration against production data The calibrated model reproduces the overall mine production response 52 The multi-response match across different wellfield designs and operating strategies demonstrates a robust calibration suitable for predictive design evaluation. pH response The pH response, a key indicator of wellfield conditioning and performance, is consistently reproduced. Leaching PLS uranium grade, cumulative production and recovery are also closely matched across both operating periods A robust calibration An excellent match is achieved across two contrasting operating periods, covering different wellfield geometries, conditioning strategies and acidification approaches
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53Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Calibration against production data The calibration captures uranium production across individual wellfields 53 Captures local variability The model reproduces the different recovery responses observed across the seven calibration wellfields. Relevant scale for mine planning Future production is forecast and scheduled wellfield by wellfield, making this scale of validation particularly important. Robust at the individual wellfield scale The calibration remains robust when moving from the aggregate mine response to individual wellfields, despite differences in design, resource inventory and operating conditions. This wellfield-scale performance supports the use of the calibrated model for wellfield-specific forecasting and life-of-mine planning
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54Investor PresentationBoss Energy. A global multi-mine Uranium producer Deposit characteristics that enable wide-spaced wellfield design Honeymoon Deposit Characteristics 1. High permeability and flow capacity Operating data confirms high hydraulic conductivity Coarse sand – fast efficient flow Sustained flow rates over greater distances give the hydraulic basis for wider injector-to-producer spacing. 40 m/day basal sand K 0.30 effective porosity ≥100 mD KSDR threshold Clayey sand – limited flow 2. Strong lateral hydraulic conductivity Interconnected sand bodies form a continuous flow system Continuous sand channels – strong well to well communication The aquifer is laterally connected, allowing pressure and flow to propagate efficiently between wider spaced wells. ~6 km continuous strike 49 m injector to extractor ~32 m³/h average well flow Disconnected sand bodies — poor well communication 3. Laterally extensive mineralisation Discontinuous high-grade zones occur within a continuous low-grade envelope Continuous low-grade envelope – reliable pattern coverage The continuous mineralised envelope links discontinuous -grade zones, allowing wider-spaced patterns to intercept mineralisation reliably 100 ppm U₃O₈ resource cut-off 600 m.ppm pattern GT minimum 4. Favourable vertical continuity Mineralisation extends across a substantial vertical interval Thicker ore behind the screen Vertically continuous low-grade mineralisation, with locally continuous high-grade lenses, supports effective sweep across wider-spaced patterns. 3 stacked horizons (at a lower cut-off grade) 1–3 levels per pattern 4 m of minimum vertical continuity 5. Favourable mineralogy Low reagent demand; limited carbonate and reactive clay Low-buffering sand — acid remains effective The lixiviant remains effective over longer flow paths. Moderate oxidant demand and minimal carbonate / clay buffering promote rapid uranium dissolution. ~6 kg/t acid consumed (based on commercial production data) ~1.8% reactive smectite ~20% kaolinite, non-reactive Clay & carbonate rich sand – pH front retarded 6. Effective confinement and hydraulic control The Namba Formation provides effective vertical confinement Flow remains within the ore bearing aquifer Combined with the low natural groundwater-flow velocity, this limits dilution and enables controlled circulation at wider spacing. 0.0001 m/day Namba vertical K up to 40 m clay confining unit 50–55 m standing water level
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55Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Wellfield design constraints Design constraints translate the resource model into buildable wellfields 55 These constraints convert spatially variable mineralisation into repeatable, hydraulically connected and operationally buildable wellfield units. Injector-to-extractor spacing Wellfield configuration01 Pattern geometry 02 Resource selection 03 Vertical configuration 35 – 70m Patterns per wellfield 8 Lateral and vertical extension 10 ± 4 m # m Minimum gt cut-off 600 Minimum vertical continuity 4 Minimum surface coverage 50 m·ppm U₃O₈ m % Mining layers 1 - 3 Wellfield layer configuration Single / Multi Screened intervals 5 - 10 # m Injector to producer distance used to size the five-spot patterns Standard wellfield development unit used for planning and scheduling. Effective leaching buffer applied around the wellfield footprint. Minimum average grade- thickness at pattern scale. At least 4 m of continuous mineralisation at ≥100 ppm U₃O₈. Prevents selection of isolated or disconnected high-grade mineralised zones. Allows up to three overlapping patterns targeting separate Eyre Formation horizons. Supports single-horizon or multi- horizon wellfield configurations. Target completion interval selected to contact the mineable mineralised horizon.
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56Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Design Scenario Evaluation Multiple wellfield configurations were systematically tested 56 Common scorecard Uranium recovery PLS grade Well count Reagent demand Production profile Operability Design variables Example of wellfield configurations tested Pattern configuration Five-spot, seven-spot or locally adapted layouts Well spacing Injector-to-producer distance and residence time Well completions Screen length, position and stacked horizons Flow rates Injection, production and hydraulic balance Injection chemistry Acid strength, delivery and conditioning strategy 01 02 03 04 05 Variables are evaluated as interacting combinations, not in isolation. 5 spot pattern 49m 5 spot pattern 70m 7 spot pattern 50m
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57Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Illustrative video of mining plan production sequence 57
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58Investor PresentationBoss Energy. A global multi-mine Uranium producer Each wellfield design produces a distinct production response From Design to Wellfield Response Wellfield design PLS uranium response by extractor Cumulative recovery49 m DESIGN Shorter flow path 70 m design Longer flow path 49 m design Wider spacing increases residence time and can improve tenor and ultimate recovery and delays the production response. The preferred design balances recovery, timing and development intensity.
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59Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation The wider-spaced wellfields are a more appropriate design based on the Honeymoon Deposit characteristics Preferred balance 59 Sub-optimal Rapid breakthrough; high development intensity; Sub-optimal recovery Improved residence time & leaching efficiency with controlled operability Slower recovery and greater dependence on hydraulic continuity Preferred balance Diminishing benefit Uranium Dissolution Efficiency curve is based on the Damköhler number. It relates the chemical reaction timescale (reaction rate) to the transport phenomena rate. The NFS baseline is selected before the response reaches the diminishing-return region
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60Investor PresentationBoss Energy. A global multi-mine Uranium producer RTM quantifies the Spacing Trade-off Wider spacing lifts recovery and cuts development intensity Injector-to-extractor spacing. Ultimate recovery refers to uranium intercepted by the simulated wellfields. Percentage changes compare the 49 m NFS base case with the 35 m historical design. Refer to ASX announcement 27 August 2026 “Honeymoon New Feasibility Study and MRE Update” 35 m 49 m 70 m The analysis tested spacing, geometry, flow and kinetics across the full planned wellfield inventory. Historical Wells (injection and extraction) Wellfields (8-pattern) Residence time Ultimate recovery U₃O₈ per extraction well Average PLS tenor Acid consumption NFS base case Larger spacing 2,480 116 80 days 80% 15.4 klbs 29 mg/L 6 kg/t Wells (injection and extraction) Wellfields (8-pattern) Residence time Ultimate recovery U₃O₈ per extraction well Average PLS tenor Acid consumption 1,340 53 150 days 90% 33.0 klbs 37 mg/L 8 kg/t Wells (injection and extraction) Wellfields (8-pattern) Residence time Ultimate recovery U₃O₈ per extraction well Average PLS tenor Acid consumption 670 37 275 days 93% 67.0 klbs 40 mg/L 13 kg/t 49 m NFS base case versus 35 m historical –46% Wells drilled –54% Wellfields +114% U₃O₈ per extraction well +28% Average PLS tenor
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61Investor PresentationBoss Energy. A global multi-mine Uranium producer Benchmarked Against Global ISR Operations Wider spacing, stronger well flow and lower acid demand than peer ISR operations Peer data from the IAEA Nuclear Energy Series (2016) ISR deposit dataset, and the Cameco InkaiOperation NI 43-101 Technical Report (2024). Comparison is illustrative rather than exhaustive. 0 10 20 30 40 50 60 70 80 Chieli / Karamurun Kazakhstan, seven-spot Budenovskoye 2 / Karatau Kazakhstan, five-spot / linear JV Inkai Kazakhstan, seven- spot / line drive Kharasan 2 Kazakhstan, seven-spot Honeymoon — larger spacing optimisation opportunity Honeymoon — NFS base case Australia, five-spot 49 m 70 m 45-50 m 45-50 m 35-65 m 40 m Injector-to-extractor well spacing Honeymoon sits within the band adopted at large ISR operations globally metres, injector to extractor Extraction well flow average per extraction well, cubic metres per hour Honeymoon New Feasibility Study 32 JV Inkai per production well, NI 43-101 8.0–10.5 Typical global ISR IAEA deposit dataset 1.8–10.8 Acid consumption ~6 kg/t sulphuric acid per tonne of rock under leach compares favourably to other deposits Very little acid consuming gangue minerals Quartz, kaolinite and muscovite — inert under leach 1.8% reactive clay Pore volumes to recovery 26 PVE modelled for 90% recovery, in line with Kazakh ISR at 15–30 PVE and well below the 70 PVE for 70% assumed in earlier Honeymoon studies
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62Investor PresentationBoss Energy. A global multi-mine Uranium producer The operating program creates further optimisation opportunities Field validation and continuous optimisation Phase Field signal What it tests Transient Acid and uranium breakthrough Hydraulic connectivity and first-arrival timing pH, ORP and SO₄ stabilisation Average residence time and acidification / oxidation response PLS uranium grade build-up Uranium mobilisation kinetics Steady Stable injection and production flows Sustainable circulation and hydraulic balance PLS uranium grade peak and decay Peak tenor, timing and production response Cumulative uranium recovery rate Recovery kinetics versus RTM forecast Drilled NFS reference response Drilled, flushing underway Wider-spacing trial Drilled Wider-spacing trial EKT1 B7 | East Kalkaroo HMT1 Honeymoon EKT2 B9 | East Kalkaroo 49 m 58 m 70 m
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63Investor PresentationBoss Energy. A global multi-mine Uranium producer The operating program creates further optimisation opportunities Future Optimisation Opportunities The NFS establishes a robust design basis. Additional field data can progressively refine spacing, completions, operating strategy and infrastructure utilisation. Operating data will define where wider spacing, well reuse and reagent optimisation can create value without compromising production performance. Wider and adaptive patterns Use 60 m and 70 m field trials to assess wider spacing. Where justified, adapt pattern geometry to local permeability and uranium grade distribution rather than applying one uniform grid. 01 Capital efficiency Recovery response Strengthen relationships between recovery, pore- volume exchange, residence time and uranium grade distribution as the production database grows. 04 Improved forecasting Reagent optimisation Integrate operating response, mineralogy and geochemical modelling to refine acid and oxidant dosing while preserving acidification and recovery consistency. 03 Lower operating cost Living reservoir model Continuously assimilate geological, hydrogeological and production data to refine future designs, reduce development uncertainty and improve LOM sequencing. 06 Continuous improvement Multi-horizon completions Optimise multi-horizon recovery by sequencing production and selectively re-screening existing wells, rather than drilling a separate well network for each mineralised horizon. 02 Capital efficiency Infrastructure reuse Maximise reuse of wellhouses and tertiary infrastructure through wellfield sequencing, extensions and tie-ins where technically and operationally practical. 05 Capital efficiency
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64Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer 64Investor Presentation Gould's Dam & Jason's Deposits
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65Investor PresentationBoss Energy. A global multi-mine Uranium producer A combined 65.9Mlbs U₃O₈ across three deposits1 Growth Beyond Honeymoon 45 Mlbs U₃O₈1 of metal at Gould’s Dam and Jason's Deposit, both considered amenable to the wide-spaced wellfield design. Regional production hub leveraging Honeymoon’s existing processing plant, infrastructure and permitting framework. Capital -efficient growth Boss’s ISR capability and operating workforce provide a low -capital pathway to future production. A single-platform growth opportunity 65.9 Mlbs U₃O₈1 across three deposits within the Honeymoon District, supporting our aspiration to extend mine life and ramp up production to 2.5Mlbs pa by the early 2030s — with a low-capital-cost pathway2 Deposit1 Tonnes (Mt) Grade (ppm) Mlbs U3O8 Gould's Dam 38.7 388 33.1 Jason’s Deposit 13.3 410 12.0 Honeymoon 21.4 440 20.8 TOTAL 73.3 410 65.9 1. Refer to Appendix 1 for further details of Mineral Resource classification for Gould’s Dam, Jason's Deposit and Honeymoon 2. Refer to the “Aspirational Statements” section in the "Disclaimer and Important Notices" section of this presentation.
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66Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Gould’s Dam A major mineralised system 66 1Refer to Appendix 1 for further details of Mineral Resource classification for Gould’s Dam 250ppm cut-off Reported above a 250ppm U3O8 lower cut-off — against the 100ppm cut-off applied at Honeymoon. Honeymoon learnings applied Permeability filter, high-grade domaining and tighter classification — together screen out material unlikely to be recovered by ISR. Amenable to wide-spacing Deposit characteristics appear to be similar to Honeymoon and would be amenable to the wide-spaced wellfield design. Extension and upgrade potential Infill and step-out drilling is the pathway to convert unclassified mineralisation and to extend and upgrade the resource. 38.7Mt @ 388ppm Mineral Resource Estimate1 Larger mineralised system than Honeymoon 33.1Mlbs U3O8 Uranium Metal1 Over 15km Known mineralisation, north–south
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67Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Jason's Deposit A major mineralised system 67 Scale and setting Yarramba Palaeovalley, 13km north of Honeymoon; defined over 3.5km of length and 1.4km of width. A significant resource proximal to Honeymoon 13.3Mt @ 410ppm Mineral Resource Estimate1 12.0Mlbs U3O8 Uranium Metal1 250ppm cut-off Reported above a 250ppm U3O8 cut-off — against 100ppm at Honeymoon. Permeability filter has also been applied. Amenable to wide-spacing Deposit characteristics appear to be similar to Honeymoon and would be amenable to the wide- spaced wellfield design. Mineralisation outside the MRE A material portion of known mineralisation is unclassified, relying on historic drilling and current drill spacings. 1Refer to Appendix 1 for further details of Mineral Resource classification for Jason's Deposit
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68Investor PresentationBoss Energy. A global multi-mine Uranium producer Investor Presentation Work Programs Advancing Gould’s and Jason's Deposit 68 Acceleration of Gould’s Dam and Jason's Deposit in parallel to Honeymoon New Feasibility Study Delivered · Accelerated Work Program July 2025 Honeymoon Review announced Ju Honeymoon Review announced Q1 FY26 Gould’s Dam and Jason’s MRE deferred Q1 FY26 Regional permitting Acceleration commenced 19 March 2026 Gould’s Dam & Jason’s MRE released Q2 FY27 Jason's Deposit EPBC submission ready Q4 FY27 Gould’s Dam EPBC submission ready Next · Permitting Catalysts ON TRACKON TRACKDELIVERED Honeymoon learnings have strengthened the resource update and accelerated the permitting pathway across Boss’s regional assets.
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69Investor PresentationBoss Energy. A global multi-mine Uranium producer One plant, three deposits Hub-and-spoke strategy 3 deposits Honeymoon, Gould’s Dam and Jason's Deposit feeding a single plant 65.9Mlbs Combined mineral resource across the three deposits2 1 processing hub Honeymoon plant, utilities and workforce already in place Satellite deposits, one plant — more pounds, minimised new infrastructure • Low-capital growth Latent back-end capacity lifted with minimal capital • Longer mine life Gould’s Dam and Jason's Deposit extend beyond the NFS • Operating synergies Fixed costs spread over more pounds — ~A$12/lb lower by the early 2030s • Higher sustained output Hub aspiration of 2.5Mlbs a year at A$65/lb AISC by the early 2030s • Staged capital Spend phases in as each deposit starts • Resilient supply Feed from three orebodies, not one Loaded Resin Trucked Gould’s Dam – loaded resin 33.1Mlbs resource2, resin trucked ~75km — no long-distance pipelines New Trunkline + Intermediate Storage Honeymoon Processing Hub Jason’s Deposit – new trunkline 12.0Mlbs resource2, 13km twin trunkline to Honeymoon 1. Refer to the “Aspirational Statements” section in the "Disclaimer and Important Notices" section of this presentation. 2. Refer to Appendix 1 for further details of Mineral Resource classification for Gould’s Dam, Jason's Deposit and Honeymoon.
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70Investor PresentationBoss Energy. A global multi-mine Uranium producer Production and costs could be meaningfully improved Honeymoon Processing Hub - Aspiration A$65/lb (US$45/lb) Aspirational AISC at hub scale by the early 2030s, assuming cost structure consistent with the NFS 1.3Mlbs 1.9Mlbs 2.5Mlbs A$88/lb US$62/lb A$77/lb US$54/lb A$65/lb US$45/lb - 10 20 30 40 50 60 70 80 90 100 - 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 FY27 Honeymoon only Early 2030's Honeymoon (NFS) Early 2030's Production Hub at NFS spacing Kazatomprom 2026 AISC guidance range ~A$12/lb lower Aspirational unit cost reduction by the early 2030s from filling latent plant capacity and fractionalising fixed costs 2.5Mlbs p.a. Aspirational production hub rate by the early 2030s, utilising back-end capacity already installed at Honeymoon Early 2040s Aspiration: 2.5Mlbs at A$65/lb (US$45/lb) AISC by the early 2030s 1. Refer to the “Aspirational Statements” section in the "Disclaimer and Important Notices" section of this presentation.
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71Investor PresentationBoss Energy. A global multi-mine Uranium producer 03 Jason's Deposit – proposed processing method Leveraging the Honeymoon plant Proven on site today East Kalkaroo trunkline and HV extension, operating now 01 How Jason's Deposit is processed Wellfield at Jason's Deposit uranium recovery at Honeymoon Wellfield at Jason's Deposit, uranium processing at Honeymoon 13km twin trunkline HDPE lines carry barren leach solution out and pregnant leach solution back to Honeymoon Production aspiration by the early 2030s1 HDPE lines carry barren leach solution out and pregnant leach solution back to Honeymoon Minimal footprint at Jason's Deposit Storage tanks, transfer pumps and power distribution only — flow into the Honeymoon plant Central facility layout Jason's Deposit site plan under consideration in the options study 02 1. Refer to the “Aspirational Statements” section in the "Disclaimer and Important Notices" section of this presentation.
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72Investor PresentationBoss Energy. A global multi-mine Uranium producer Gould’s Dam – proposed processing method Transporting uranium, not water Proven satellite model – used globally Illustrative example below of enCore Energy’s Upper Spring Creek resin loading facility, South Texas 01 Central facility layout Gould’s Dam site plan under consideration in the options study 02 How Gould’s Dam is processed Resin loaded on site, elution, precipitation, calcination and drying at Honeymoon 03 Resin loaded at Gould’s Dam, processing at Honeymoon ~75km to Honeymoon Loaded resin trucked to the existing plant — likely to be more economic than a trunkline at that distance Production aspiration by the early 2030s1 Initial rate based on current understanding of resource and satellite facility size being carried in options study Options study underway Estimates underway for resin and eluate trucking, advancing to PFS 1. Refer to the “Aspirational Statements” section in the "Disclaimer and Important Notices" section of this presentation.
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73Investor PresentationBoss Energy. A global multi-mine Uranium producer Baseline studies nearing completion for permitting submissions Permitting progress Workstream Jason's Deposit Gould’s Dam Groundwater Baseline and geological data collection completed Baseline collection and pumping tests completed Environment Baseline ecology and soil/sediment studies completed; surface water and flood assessments undertaken, air quality monitoring installed Baseline Ecology studies completed; radon monitoring installed; soil / sediment sampling advanced Engineering Preliminary trunkline and infrastructure design completed; initial wellfield layouts Preliminary engineering for trunkline and satellite options; initial wellfield layouts Metallurgy Sonic core drilling completed; initial ANSTO test work completed Sonic core drilling completed; initial ANSTO test work completed Substantial baseline environmental and initial technical work delivered across both deposits Significant work completed with decision last year to accelerate Gould's Dam and Jason's Deposit Next milestones: Complete remaining surveys, modelling and impact assessments; finalise development scope and consultation to support EPBC ref errals and Mining Lease applications.
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74Investor PresentationBoss Energy. A global multi-mine Uranium producer CY2026 CY2027 CY2028 CY2029 CY2030 CY2031 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Jason's Deposit EPBC Referral Mining Lease Assessment / PEPR Studies Construction Production Gould's Dam EPBC Referral Mining Lease Assessment / PEPR Studies Construction Production Indicative development timeline – Jason's Deposit and Gould's Dam Development Pathway Draft schedule, subject to approvals, wellfield performance and board decisions. Assumes no field leach trials are required. Target Production Early 2030 Target Production Early 2031 Approvals and studies Construction and production Contingency — range within which the activity may fall
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75Investor PresentationBoss Energy. A global multi-mine Uranium producer Honeymoon Catchment - Growth Exploration – providing strategic growth in the Honeymoon Catchment Regional discovery pipeline Create future options Systematic exploration across Boss' broader tenement position to identify new ISR-amenable deposits and establish the next generation of development opportunities. 03 Resource delineation Increase confidence Focused drilling to lift geological confidence in Inferred Resources, support conversion to higher-confidence categories and inform future development studies. 02 Resource extension Grow the resource base Targeted drilling at Gould's Dam and Jason's Deposit to extend known mineralisation beyond current resource boundaries and define the full scale of each mineralised system. 01 • Extend known systems • Increase resource confidence • Generate new opportunities
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76Investor PresentationBoss Energy. A global multi-mine Uranium producer up to 30 holes / ~3,960mDiamond core up to 507 holes / ~67,431mMud rotary Exploration – Gould’s Dam Deposit FY27 delineation drilling program Purpose: Upgrade prospective mineralisation to Inferred Resource Classification; core for density and mineralogy Up to 537 holes planned ~71,391m total metres 85% Resource extension Planned drilling Drilling by classification 85% Inferred (15%) Resource extension (85%) Indicative Timing (FY27) Jul-26 Oct-26 Jan-27 Apr-27
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77Investor PresentationBoss Energy. A global multi-mine Uranium producer up to 15 holes / ~1,890mDiamond core up to 100 holes / ~12,600mMud rotary Exploration – Jason's Deposit FY27 delineation drilling program Purpose: Upgrade prospective mineralisation to Inferred Resource Classification; core for density and mineralogy. Up to 115 holes planned 67% Resource extension Planned drilling Drilling by classification 67% Indicated (3%) Inferred (30%) Resource extension (67%) Indicative Timing (FY27) Jul-26 Oct-26 Jan-27 Apr-27 ~14,490m total metres
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78Investor PresentationBoss Energy. A global multi-mine Uranium producer FY27 – Systematic testing of the Honeymoon Hub catchment beyond Gould’s Dam and Jason'sDeposit Building Boss’s next discovery pipeline Gould’s Dam Area Honeymoon / Jason's Deposit Area • Passive seismic interpretation has identified priority palaeovalleys across the Honeymoon catchment including proximal to the Honeymoon, Jason's Deposit and Gould’s Dam deposits • Systematic aircore drilling is planned for FY27 to test valley architecture and uranium mineralisation FY27 Regional Aircore Program A deliberate search for the next generation of ISR opportunities 16,440m planned drilling aircore holes 159 priority targets 9
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79Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer 79Investor Presentation Alta Mesa
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80Investor PresentationBoss Energy. A global multi-mine Uranium producer Alta Mesa Joint Venture Alta Mesa JV (30%) Dec 2023 Acquisition announced Feb 2024 Acquisition completed FY25 73klbs received FY26 162klbs received 01 0302 Performance Performance has not met initial expectations. Management Boss management will continue to work with enCore as Manager of the Joint Venture on operating performance and planning. Capital Discipline Any future capital requirement at Alta Mesa will need to exceed Boss’ internal capital hurdles.
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81Investor PresentationBoss Energy. A global multi-mine Uranium producer Closing Boss Energy. A global multi-mine Uranium producer 81Investor Presentation
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82Investor PresentationBoss Energy. A global multi-mine Uranium producer Boss Energy. A global multi-mine Uranium producer Boss Energy Deliver and optimise Honeymoon: Safe, reliable production, improved margins and disciplined execution of the NFS plan A stronger foundation. A clear direction. Our focus is to turn this stronger foundation into operational performance, growth and shareholder value Build the regional production hub: Advance Jason's Deposit and Gould’s Dam to support our aspiration for higher production, lower costs and a longer mine life Grow long-term shareholder value: Apply our people, technical capability and commercial discipline across the business
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83Investor PresentationBoss Energy. A global multi-mine Uranium producer Q&A
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84Investor PresentationBoss Energy. A global multi-mine Uranium producer Contact Information +61(8) 6263 4494 boss@bossenergy.com ASX: BOE OTCQX: BQSSF
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85Investor PresentationBoss Energy. A global multi-mine Uranium producer Appendices Boss Energy. A global multi-mine Uranium producer 85Investor Presentation
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86Investor PresentationBoss Energy. A global multi-mine Uranium producer Appendix 1 - Gould’s Dam and Jason's Deposit Mineral Resource (March 2026) Resource Classification Grade Metal Mt ppm U3O8 Kt U3O8 Mlbs U3O8 Indicated 7.5 465 3.5 7.7 Inferred 31.2 369 11.5 25.4 TOTAL 38.7 388 15.0 33.1 Table 1: Gould’s Dam Mineral Resource (reported 19 March 2026) Table 2: Jason's Deposit Mineral Resource (reported 19 March 2026) Resource Classification Grade Metal Mt ppm U3O8 Kt U3O8 Mlbs U3O8 Indicated 4.8 464 2.2 4.9 Inferred 8.5 380 3.2 7.1 TOTAL 13.3 410 5.4 12.0 Notes: • Effective 31 December 2025 • The model is reported unconstrained and above a 250ppm U3O8 lower cut-off grade and 100mD Ksdr permeability (unit millidarcy; mD) lower cutoff for all mineralisation subdomains in consideration of potential for recovery by ISR processing. • The U3O8 lower cut-off grade reflects the assumed lower detection limit of the PFN tool. A Ksdr permeability is assumed to be moderate permeable equivalent to a well-sorted sand/gravels which would be amenable for ISR mining. • There is no historic depletion by production. • Estimation of the combined PFN data and disequilibrium factored gamma data with high-grade cuts is by ordinary kriging using dynamic anisotropy for the mineralised zones. • The definition of the mineralised zones is refined by conditional indicator kriging (CIK) estimate based on a 250ppm U3O8 indicator and a resultant estimated 17% probability of being above the indicator cut-off grade. The subdomains are used as hard boundaries. • Density is for the Eyre Formation based on analyses of sonic core as 1.9 t/m3, which is consistent with semi-consolidated quartz sandstone. • The model assumes agglomeration of 10mE x 10mN x 1mRL parent blocks for definition of well fields for production in the Gould’s Dam area. The surrounding areas that are still at an early stage of resource definition with less available data were modelled on larger 40mE x 40mN x 1mRL panels. • The model does not account for dilution, ore loss, hydrogeology, or recovery issues. Continuity of high- grade U 3O8 is expected to be locally erratic throughout the palaeovalley. These parameters should be considered during the mining study as being dependent on the ISR treatment process. • Classification is according to JORC Code Mineral Resource categories. • Estimated disequilibrium factors applied to the gamma data cannot fully mitigate the risk of assumptions about the tenor of uranium mineralisation based on that gamma data. The gamma data does not directly measure uranium. • A Mineral Resource requires technical and economic evaluation and consideration of modifying factors for conversion to an Ore Reserve. It is possible that not all Mineral Resource will convert to an Ore Reserve. • Totals may vary due to rounded figures. Notes: • Effective 31 December 2025 • The model is reported unconstrained and above a 250ppm U3O8 lower cut-off grade and 100mD Ksdr permeability (unit millidarcy; mD) lower cutoff for all mineralisation subdomains in consideration of potential for recovery by ISR processing. • The U3O8 lower cut-off grade reflects the assumed lower detection limit of the PFN tool. • A Ksdr permeability is assumed to be moderate permeable equivalent to a well-sorted sand/gravels which would be amenable for ISR mining. • There is no historic depletion by production. • Estimation of the combined PFN data and disequilibrium factored gamma data with high-grade cuts is by ordinary kriging using dynamic anisotropy for the mineralised zones. • The definition of the mineralised zones is refined by conditional indicator kriging (CIK) estimate based on a 250ppm U 3O8 indicator and a resultant estimated 17% probability of being above the indicator cut-off grade. The subdomains are used as hard boundaries. • Density is for the Eyre Formation based on analyses of sonic core as 1.9 t/m3, which is consistent with semi-consolidated quartz sandstone. • The Jason's Deposit model assumes agglomeration of 40mE x 40mN x 1mRL parent blocks for early-stage resource definition with wide spaced fences, closer spaced drilling along the fences and good proportion of recent, quality data. The model is held on 10mE x 10mN x 1m sub blocks to accommodate a lithological model generated by Boss. • The model does not account for dilution, ore loss, hydrogeology, or recovery issues. Continuity of high- grade U 3O8 is expected to be locally erratic throughout the palaeovalley. These parameters should be considered during the mining study as being dependent on the ISR treatment process. • Classification is according to JORC Code Mineral Resource categories. • Estimated disequilibrium factors applied to the gamma data cannot fully mitigate the risk of assumptions about the tenor of uranium mineralisation based on that gamma data. The gamma data does not directly measure uranium. • A Mineral Resource requires technical and economic evaluation and consideration of modifying factors for conversion to an Ore Reserve. It is possible that not all Mineral Resource will convert to an Ore Reserve. • Totals may vary due to rounded figures.
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87Investor PresentationBoss Energy. A global multi-mine Uranium producer Appendix 1 - Honeymoon Mineral Resource Resource Classification Grade Metal Mt ppm U3O8 Kt U3O8 Mlbs U3O8 Indicated 12.1 510 6.2 13.7 Inferred 9.3 350 3.2 7.1 TOTAL 21.4 440 9.4 20.8 Table 3: Honeymoon Mineral Resource (reported 27 August 2026) Notes: • The Mineral Resource estimate is classified in accordance with the JORC Code (2012). • The Mineral Resource database has a cut-off date of 31 December 2025. • The effective date of the Mineral Resource estimate is 30 June 2026. • The Mineral Resource estimate is reported at an in-situ cut-off of 100 ppm U3O8. A grade-thickness (GT) cut-off of GT≥400 m.ppm U3O8 was applied selectively in border areas of the MRE. • Only the recoverable portion of blocks ≥100 ppm U3O8 is reported. • The Mineral Resource is constrained to an ISR-amenable permeability threshold of KSDR≥100 mD. • The Mineral Resource is mainly based on equivalent U3O8 (eU3O8), without adjusting for localised radiometric disequilibrium effects. • The Mineral Resource estimate is reported net of depletion from the Honeymoon in-situ recovery (ISR) extraction of 3.3 Mlbs U3O8 (1.5 Kt U3O8) as of 30 June 2026 by subtraction of extracted metal tonnes from Indicated Resource metal tonnes. • The Mineral Resource estimate is reported on an in-situ tonnes basis. • The Mineral Resource estimate is rounded to reflect the level of confidence in the estimate at the time of reporting. • Totals may vary due to rounding. • The Mineral Resource estimate is reported both within the Honeymoon ML6109 licence and outside in EL6081 licence. Honeymoon Project Mineral Resource Estimate — effective date 30 June 2026, reported net of ISR depletion of 3.3 Mlbs U 3O8 to 30 June 2026.