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━━━━━━ Investor presentation – Mining Forum Americas September 2026
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Disclaimer This presentation has been prepared by St Barbara Limited (“Company”). The material contained in this presentation is summary information for general information purposes only. This presentation is not investment advice, nor is it an offer or invitation for subscription or purchase of, or a recommendation in relation to, securities in the Company and neither this presentation nor anything contained in it shall form the basis of any contract or commitment. This presentation contains forward-looking statements that are subject to risk factors associated with exploring for, developing, mining, processing, the sale of gold, trading markets and completion of acquisitions. Forward-looking statements include those containing such words as anticipate, estimates, forecasts, should, will, expects, plans, production guidance or similar expressions. Such forward-looking statements are not guarantees of future performance and involve known and unknown risks, uncertainties, assumptions and other important factors, many of which are beyond the control of the Company, and which could cause actual results or trends to differ materially from those expressed in this presentation. Actual results may vary from the information in this presentation. The Company does not make, and this presentation should not be relied upon, any representation or warranty as to the accuracy, or reasonableness, of such statements or assumptions. Investors are cautioned not to place undue reliance on such statements. The statements, opinions, and estimates in this presentation are subject to change without notice and may be subject to rounding, as are statements about market and industry data, projections and guidance estimates. The Company undertakes no obligation to update publicly or release any revisions to these forward-looking statements. This presentation has been prepared by the Company as a summary based on information available to it, including information from third parties, and has not been independently verified. No representation or warranty is made as to the accuracy, completeness or reliability of the information. To the maximum extent permitted by law, neither the Company, their directors, employees or agents, advisers, nor any other person accepts any liability, including, without limitation, any liability arising from fault or negligence on the part of any of them or any other person, for any loss arising from the use of this presentation or its contents or otherwise arising in connection with it. Non-IFRS Measures: The Company's results are reported under the International Financial Reporting Standards (“IFRS”). This presentation includes certain non-IFRS financial measures, including cash operating costs, to provide a greater understanding of the Company operations. These measures: - may be calculated differently by other companies and should not be used for comparison; and - should be used in addition to, and not as a replacement for measures prepared in accordance with IFRS. Financial figures are in Australian dollars unless otherwise noted. Financial year is 1 July to 30 June. This presentation is not audited. Australian Securities Exchange (ASX) Listing code “SBM” 2
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Disclaimer JORC Code It is a requirement of the ASX Listing Rules that the reporting of exploration results and mineral resources in Australia comply with the 2012 edition of the Joint Ore Reserves Committee’s Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (JORC Code). Investors outside Australia should note that while mineral resource estimates of St Barbara in this Presentation comply with the JORC Code (such JORC Code mineral resources being Mineral Resources), they may not comply with the relevant guidelines in other countries and, in particular, do not comply with (i) National Instrument 43-101 (Standards of Disclosure for Mineral Projects) of the Canadian Securities Administrators (the Canadian NI 43-101 Standards); or (ii) Item 1300 of Regulation SK, which governs disclosures of mineral reserves in registration statements filed with the SEC. Information contained in this Presentation describing mineral deposits may not be comparable to similar information made public by companies subject to the reporting and disclosure requirements of Canadian or US securities laws. You should not assume that quantities reported as “resources” will be converted to reserves under the JORC Code or any other reporting regime or that St Barbara will be able to legally and economically extract them. JORC Compliance statement The information in this presentation that relates to New Simberi’s Mineral Resources and Ore Reserves is extracted from the report titled ‘Q3 March FY26 Quarterly Report’ released to the ASX on 29 April 2026. Atlantic’s Mineral Resources is extracted from the report titled ‘15-Mile Processing Hub Mineral Resources Estimate Increases 24% to 2.5 Moz’ released to the ASX on 28 July 2026 and Ore Reserves is extracted from the report titled ‘15-Mile Processing Hub Project PFS Updated” released to the ASX on 28 September 2026. These reports are available to view at www.stbarbara.com.au and www.asx.com.au, and for which Competent Persons’ consents were obtained. St Barbara confirms that it is not aware of any new information or data that materially affects the information included in the Original Reports and that all material assumptions and technical parameters underpinning the Mineral Resources and Ore Reserves estimates in the Original Reports continue to apply and have not materially changed. St Barbara confirms that the form and context in which the Competent Person’s findings are presented have not been materially modified from the Original Reports and that each Competent Person’s consent remains in place for subsequent releases by St Barbara of the same information in the same form and context, until the consent is withdrawn or replaced by a subsequent report and accompany consent. 3
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01 Corporate Overview
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Corporate Summary Capital Structure Note: 1. Based on ASX closing prices as at 25 September 2026; 2. Includes unaudited cash balance as at 31 August 2026 of A$427m. Includes restricted cash of A$81 million for the Atlantic rehabilitation bond at AUD/CAD of 0.98; 3. As at 15 August 2026. 5 Shareholders3 Institutional (60%) Retail (34%) Other (6%) Substantial Shareholders - Paradice (6.9%) - Vanguard (5.7%) - Baker Steel (5.2% Shares on issue (ASX: SBM) 1,226.1M Performance rights 69.5M Share price1 A$0.82 Market capitalisation1 A$1,043M Cash2 A$427M Debt Nil Hedging Nil Equity investment in Geopacific Resources (ASX:GPR) – 14.3%1 A$16M Broker Coverage
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Simberi Sale Transaction Summary 6 St Barbara to divest its remaining 40% interest in the New Simberi Gold Project to Lingbao Gold for A$453m cash PLUS royalties TOTAL CONSIDERATION ► A$410m cash payment on completion ► A$43m repayment of St Barbara’s share of funding to New Simberi between April and signing ► 2.75% NSR on gold and silver from New Simberi and 1.5% NSR on the Tabar Islands ELs TRANSACTION STRUCTURE 40% sale of New Simberi ► Sale of St Barbara’s remaining 50% of Tabar Island Holdings (joint owned entity owning 80% of New Simberi and 100% of Tabar Islands ELs) ► St Barbara’s share of ongoing cash calls related to New Simberi to be funded by Lingbao from signing to completion ROYALTY PORTFOLIO 2.75% & 1.5% NSR ► 2.75% NSR on 100% future gold and silver production from New Simberi ► 1.5% NSR on all future minerals from Tabar Island Exploration Licenses ► Both royalties guaranteed by Lingbao listed entity FULLY FRANKED DIVIDENDS A$0.13 per share ► Board will consider declaring a special A$0.13 per share fully franked dividend at completion ► This would be in addition to the fully franked dividend of A$0.05 per share declared on 28 August ► Board has also reconfirmed that an on-market share buy-back of up to 100m shares is being considered CONDITIONS PRECEDENT Regulatory & shareholder ► PRC and PNG regulatory approvals ► SBM shareholder approval where required ► Lingbao shareholder approval ► No material adverse event TIMING March Quarter FY27 ► Completion targeted for Q3 March FY27 ► Post-completion: royalty portfolio strategic review Note: Refer to ASX announcement on 10 September 2026 titled “Remaining New Simberi Interest to be sold to Lingbao” A$453 million cash PLUS royalties
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St Barbara management team 7 David Cotterell GM Business Development & Investor Relations GM Business Development and Investor Relations since July 2023. 25 years’ mining and global financial markets experience across geology, equities research, investor relations and business development. Kylie Panckhurst General Counsel & Company Secretary General Counsel and Company Secretary since September 2023. Over 15 years’ experience as a corporate and commercial lawyer across various industries. Executed transactions and supported projects in Africa, the Americas, Asia-Pacific and Europe for both public and private sector clients. Andrew Strelein Managing Director & CEO Managing Director & CEO since July 2023. Highly experienced mining executive with extensive global experience in leadership roles across a number of mining jurisdictions including Australia, Indonesia, Africa and North America with Newmont, Euronimba and earlier with Normandy. Extensive experience in incorporated and unincorporated joint ventures including KCGM, Boddington, Euronimba, gold refineries and power stations. Sara Prendergast Chief Financial Officer Chief Financial Officer since September 2023. Over 20 years’ finance experience in multinational listed mining companies across a range of commodities including Nickel, Gold, Copper, Uranium and Zinc with Gold Fields, Minara Resources, Xstrata, BHP Billiton, Glencore, Downer, and Orica. Brett Ascott EGM Projects & Technical Support EGM Projects and Technical Support since July 2023. Over 30 years of industry experience across Australia, Indonesia and West Africa in senior technical management roles covering geology, geotechnical engineering, mining engineering, business and strategic planning, project management, studies and business development. Phil Stephenson Operations Advisor Roger Mustard EGM Exploration EGM Exploration since July 2023. Over 30 years of gold exploration experience across Asia-Pacific and North America in technical and senior technical management roles with Dominion Mining, Ross Mining, Auzex Resources and Oceana Gold Corporation. Operations Advisor since February 2025. Extensive global mining experience, including PNG (Lihir and Porgera), Australia, Indonesia and North America, in senior management and executive leadership roles with Newcrest, Newmont, Barrick and Placer Dome. Experience with joint ventures including KCGM.
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02 Capital Management outlook
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427 453 880 Current cash balance Proceeds Pro forma Pro forma cash position Cash build up (A$m) • St Barbara to receive A$410m in upfront cash from Lingbao and A$43m capital reimbursement from expenditure on the New Simberi Gold Project from April until signing ‒ As at 31 August this was A$43m • Existing cash balance of A$427m to result in pro-forma cash balance of A$880m1 • Potential for more cash realisation following royalty portfolio strategic review Key takeaways Refer to ASX announcement on 10 September 2026 titled “Remaining New Simberi Interest to be sold to Lingbao” 1. Includes unaudited cash balance (including restricted cash) as at 31 August 2026 of A$427m, cash proceeds from the transaction (A$410m) and loan repayments from Lingbao (A$43m). Excludes listed investments. 9 Reflects cash consideration (A$410m) and capital reimbursement (A$43m) (As at 31 August 2026)
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• Following the transaction, St Barbara is considering full distribution of franking credits with total of A$221m to shareholders, consisting of 1) A$0.05 per share dividend declared on 28 August 2) Fully franked dividend of A$0.13 per share to be considered following completion of the transaction Fully Franked Dividends Fully franked dividend payment capacity (A$m) Notes. 1,226 million shares on issues as at 8 September 2026. 1. Fully franked dividend to be considered by the St Barbara board following completion of the transaction 10 (Expected1) Potential share buy-back of up to 100m shares on issue following the 15-Mile Processing Hub Pre-Feasibility Study due at the end of September 2026 61 159 221 A$0.05ps dividend A$0.13ps dividend Total dividend returns (Declared on 28 August 2026)
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03 Business overview
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Overview of Nova Scotia Projects Integrated Operation with 15-Mile Processing Hub Project Nova Scotia Projects comprise: Touquoy Restart: • To produce gold from the processing of existing stockpiles through the existing Touquoy processing plant 15-Mile Mine: • Four simple low strip ratio open pits (Egerton-Maclean, Plenty, Hudson & 149) providing baseline feed to the relocated Touquoy mill Old Mitchell Mine: • Redesigned as a satellite deposit with ore mining and haulage ~72 km to 15- Mile commencing in year 3 Old Austen Mine: • Low capital, satellite deposit introduced in year 4 of the mine plan with ore mining and haulage ~64 km to 15-Mile 12 1 2a 2b 2c
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13 Andrew Taylor P. Eng VP Operations Adam Guignard Manager - Processing Appointed Manager Processing in 2021 and presently overseeing Touquoy since closure. Initial appointment with Atlantic Gold in 2017 to lead commissioning of Touquoy. 17 years of experience in the Canadian gold mining sector. Worked at seven different gold mines; commissioned five gold processing plants, including two as the lead and one as the signing authority. Craig Hudson P. Eng Executive Vice President, Atlantic Appointed EVP Atlantic in May 2026. Formerly GM Atlantic Projects from 2024. Initial appointment with Atlantic Gold in 2017 to lead construction and commissioning of Touquoy. Over 15 years experience in gold mining sector, both internationally and in Canada. Experience with Barrick, Newmont and Ausenco specialising on project studies, consulting, commissioning and operations. Dustin O'Leary Manager Business Development Appointed Manager Business Development in 2025. Formerly Manager Communications and leading government engagement. Over 20 years of experience government engagement, marketing and communications. Previously worked for the Halifax Regional Municipality as Promotions and Research Coordinator for 8 years. Awarded Queens Platinum Jubilee Medal for service to the Province of Nova Scotia. Jennifer Adshade Manager Community and First Nations Appointed Community & Indigenous Engagement Manager. Formerly with Atlantic in other senior permitting / engagement since roles 2018. Has worked as an Environmental Professional for over 15 years in Canada. Melissa Nicholson Environment Manager Appointed Environment Manager in 2022. With Atlantic since 2018. 13 years of environmental Contaminated Sites Assessment and Remediation experience as a 3rd party consultant. 7 years of experience in the Canadian gold mining sector Andrew Taylor P. Eng Vice President Operations Appointed VP Atlantic Operations in late 2023. Formerly GM Operations from 2021 after stint as Manager Processing at Touquoy. Over 20 years of experience in the Canadian Mining Sector including with Inco/Vale in a variety of engineering, metallurgical and supervisory roles. Strong management team, with key personnel having years of experience in the region Nova Scotia management team and key personnel
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Project status 14 Touquoy Restart PFS completed Operating cash flow at US$4,000/oz anticipated at C$118m with 38koz gold production over a 13-month operation 15-Mile Processing Hub Project updated PFS completed Long-term average gold production >100kozpa across an 13+ year mine life Touquoy Restart permits approved Nova Scotia Environment and Climate Change approved amendments to Industrial Approval permit conditions Exploration pipeline bolstered Pipeline strengthened via regional EL acquisitions and prioritisation of key exploration targets Following the New Simberi sale, St Barbara will be a Nova Scotia focused developer, with near term production at Touquoy Restart while progressing development activities at the 15 -Mile Processing Hub Touquoy Restart 15-Mile
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IAAC determination 15-Mile is expected to receive the Section 16 determination under the Impact Assessment Act, removing the requirement for a parallel federal impact assessment Q4 CY26 Touquoy Restart production Restart of ore processing at the Touquoy plant by end of calendar year 2026 — first ore, first cash flow from restart, and validation of the low-capital project FY27 15-Mile Processing Hub Project FS and FID Feasibility Study completion targeted for June 2027, concurrent with FID Submission of Environmental and Social Impact Assessment trigger documents over FY26/27 in parallel with Feasibility Study Upcoming Milestones 15 Following the New Simberi sale, St Barbara will be a Nova Scotia focused developer, with near term production at Touquoy Restart while progressing development activities at the 15 -Mile Processing Hub Touquoy Restart 15-Mile
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Nova Scotia Projects Timeline Note: 1. Assumes consolidated Environmental Impact Assessment for 15-Mile, Old Austen Mine and Old Mitchell Mine 16 Touquoy Restart FY 2027 FY 2028 FY 2029 FY 2030 Dec Jun Dec Jun Dec Jun Dec Jun Permitting, re-commissioning mill and construction of in-pit tailings Touquoy production 15-Mile Processing Hub Environmental Impact Assessment 1 Pre-Feasibility Study (Update) Feasibility Study Final Investment Decision Industrial Approval & Other permits Detailed Engineering Site construction Works Commissioning/ Operations The above dates are indicative only and the Company reserves the right to vary the timeline at any time without notice, subject to the ASX Listing Rules and the Corporations Act and other applicable laws. 15-Mile Processing Hub FID targeted by end of FY27, with production targeted to commence in FY30
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Updated PFS Highlights Updated PFS delivers a larger Ore Reserve, longer mine life and materially enhanced economics versus the January 2026 study Source: ASX release on 28 September 2026 titled “15-Mile Pre-Feasibility Study and Ore Reserve Update”. Economics are post-tax at a gold price of US$3,000/oz and C$1.00 = US$0.71 / A$1.09; initial capital to +/ -25% AACE Class 4 accuracy. 17 1.44 Moz ORE RESERVES +17% 13 years MINE LIFE 1,377 koz LOM GOLD PRODUCED 1,098 US$/oz LOM AISC 1,705 A$m POST-TAX NPV5 81.6 % POST-TAX IRR • Ore Reserves up 17% to 1.44 Moz of contained gold • Mine life extended to 13 years on Proven & Probable Reserves only • Underpinned by an updated 2.5 Moz Mineral Resource Bigger, longer-life orebody • LOM gold production up 203 koz to 1,377 koz recovered • Above 120 koz per annum in FY31 and FY32; 106 koz pa average • LOM AISC of US$1,098/oz on a low 2.8:1 strip ratio Enhanced, low-cost production • Post-tax NPV5 of A$1,705m and 81.6% IRR at US$3,000/oz gold • Post-tax NPV5 of A$2,721 million and IRR of 121.4% at US$4,000/oz gold • ~21% NPV uplift versus the January 2026 PFS • De-risked initial capital of C$289m (A$315m) • Feasibility Study accelerated to Q3 March FY27; FID targeted Q4 June FY27 Compelling economics
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Nova Scotia Projects – Touquoy Restart and 15-Mile Hub Nova Scotia Projects Production vs AISC 1 Note: 1. Refer to ASX announcement on 28 September 2026 titled “15-Mile Pre-Feasibility Study and Ore Reserve Update”; 15-Mile Processing Hub Pre-Feasibility Study uses US$3,000 gold price and CAD/USD of 0.71 18 Growth Capital (US$m) 1 Growth and Initial Capital (US$m)1 Nova Scotia Projects Production vs AISC1 19 19 96 133 125 98 95 96 100 112 104 102 107 106 105 - 400 800 1,200 1,600 2,000 - 25 50 75 100 125 150 FY27 FY28 FY29 FY30 FY31 FY32 FY33 FY34 FY35 FY36 FY37 FY38 FY39 FY40 FY41 FY42 All-in Sustaining costs (US$/oz) Gold Production (koz) Touquoy Stockpiles 15-Mile Old Mitchell Old Austen All-in Sustaining Cost (US$/oz) 205 74 46 - 50 100 150 200 250 FY29 FY30 FY31 FY32 FY33 Initial Capital Expansion Capital
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• Touquoy Restart Study results1 outlined a near-term, low capital and low-cost restart ‒ Initial capital of C$11.4m ‒ Estimated gold production of 38koz over a 13-month period ‒ Average All-in Sustaining Cost of US$1,598/oz • Touquoy Restart opportunity provides near-term additional upside for Atlantic with minimal capital spend • On 13 April 2026, the NSECC approved amendments to the Industrial Approval permit conditions for the Touquoy Restart • On 24 April FID was approved and two major contracts signed • Preparation for the in-pit tailings deposition system is underway and material movement activities have already commenced on the ore and waste stockpiles • Touquoy Restart is anticipated to recommence ore processing by the end of calendar year 2026 Touquoy Restart Project Overview 1. Refer to ASX announcement on 20 April 2026 titled “Updated Group Production and Cost Outlook“ 19 1Nova Scotia Projects Processing life 1.1 years Total Mill Feed Tonnes 3.0 Mt Average Mill Feed Gold Grade 0.4 g/t Total Contained Gold 43 koz Total Recovered Gold 38 koz Average Gold Recovery 88% Cash cost US$1,430 – 1,630/oz AISC US$1,500 – 1,700/oz Project Initial capex US$7-9m 38 koz RECOVERED GOLD 88% GOLD RECOVERY US$1,598/oz Avg. AISC Project Highlights Project Details1 Key Metrics
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15-Mile Processing Hub Project Overview Project Details1 20 • The Updated PFS leverages the PFS completed in January 2026 with updated resource models and associated changes to mine design, pit sequencing, stockpiles and other infrastructure • The updated PFS confirmed project with production over 100kozpa across a 13 year mine life ‒ 15-Mile Mine contains 4 open pits with Ore Reserves of 620koz ‒ Old Mitchell Mine contains 1 open pit with Ore Reserves of 390koz ‒ Old Austen Mine contains 1 open pit with Ore Reserves of 220koz • Gold is free-milling with high recovery from conventional gravity & Carbon-in-Leach (CIL) methods at relatively coarse grind size • Processing Hub includes 3 stage crushing, ball mill, gravity, CIL, cyanide detox with conventional tailings ‒ Reuses the majority of the Touquoy Process Plant • Project phases include 1) 1 year construction, 2) 13 years operation • Mineral Resources Estimate now expanded by 24% to 2.5Moz Au • Ore Reserves increased by 17% to 1.4 Moz following incorporation of expanded Mineral Resources Estimate Note: 1. Refer to ASX announcement on 28 September 2026 titled “15-Mile Pre-Feasibility Study and Ore Reserve Update”; 15-Mile Processing Hub Pre-Feasibility Study uses US$3,000 gold price and CAD/USD of 0.71 2 3 4Nova Scotia Projects Key Metrics Total waste mined 109.2 Mt Average Strip Ratio 2.82 w:o Operational years FY30 – FY42 Total Mill Feed 38.7 Mt Average Mill Feed Grade 1.16 g/t Average Gold Recovery 95.8% Total contained gold 1.4 Moz Mining costs C$18.0/t milled Mining Feed Transport C$5.1/t milled Processing costs C$10.6/t milled G&A costs C$5.6/t milled Initial capex C$289m Sustaining capex LOM C$234m
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Nova Scotia Exploration – 15-Mile Processing Hub Exploration Pipeline 21 15-Mile Processing Hub Exploration Pipeline, Nova Scotia, Canada • 46 exploration targets within 75 km of the proposed 15-Mile Processing Hub Project ranging from: ‒ Stage A (conceptual target) ‒ Stage B1 (drill target) ‒ Stage B2 (advance drill target) ‒ Stage C (resource definition) ‒ Stage D (Feasibility Study level) and ‒ Stage E (Mining Operation) • FY27 work programs are highlighted for: o surface sampling o geophysical surveys or re- processing / 3D modelling, and o RC drilling
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Nova Scotia Exploration - 15-Mile Processing Hub Exploration Pipeline 22 46 exploration targets within 75 km of the proposed 15 -Mile Processing Hub Project
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Nova Scotia Exploration Acceleration - Old Austen Mine Down-Plunge 23 Old Austen Mine Down-Plunge Prospect and along strike at the Mill Shaft West Prospect have been prioritised
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A Appendix
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Simberi Gold Ore Reserves 25 Note: Gold Ore Reserves – 50% Attributable basis for Simberi. Ore Reserve estimates are extracted from the report titled ‘Q3 March FY26 Quarterly Report’ released to the ASX on 29 April 2026. 1. Ore Reserves are based on a gold price of: Simberi (US$2,000/oz Au) 2. Cut-off grades: Simberi based on a $0/t net revenue, including gold revenue. 3. Mineral Resources are reported inclusive of Ore Reserves. 4. Rounding may result in apparent summation differences between tonnes, grade and contained metal. Proved Probable Total Deposit Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Simberi Oxide 4.6 1.1 160 2.1 1.1 75 6.6 1.1 235 Simberi Sulphide 5.0 2.1 330 10.3 2.1 680 15.3 2.1 1,010 Simberi Stockpile 0.8 1.3 30 - - - 0.8 1.3 30 Total Simberi 10.3 1.6 520 12.3 1.9 755 22.6 1.8 1,275
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Simberi Gold Mineral Resources 26 Measured Indicated Inferred Total Deposit Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Simberi Oxide 6.5 1.0 210 7.5 1.2 290 1.5 0.9 45 15.4 1.1 545 Simberi Sulphide 13.7 1.4 615 35.6 1.4 1,600 2.5 1.2 95 51.7 1.4 2,310 Simberi Stockpile 0.8 1.3 30 - - - - - 0.8 1.3 30 Total Simberi 20.9 1.3 855 43.0 1.4 1,890 3.9 1.1 140 67.8 1.3 2,885 Note: Gold Mineral Resources – 50% Attributable basis for Simberi. Simberi Mineral Resource Estimates are extracted from the report titled ‘Q3 March FY26 Quarterly Report’ released to the ASX on 29 April 2026. 1. Mineral Resources are reported inclusive of Ore Reserves. 2. Cut-off Grades Simberi Oxide (0.4 g/t Au), Simberi Sulphide (0.6 g/t Au) 3. All Mineral Resources are reported constrained by a US$2,500/oz pit shell. 4. Rounding may result in apparent summation differences between tonnes, grade and contained metal.
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Simberi Silver Ore Reserves 27 Note: Silver Ore Reserves – 50% Attributable basis for Simberi. Ore Reserve estimates are extracted from the report titled ‘Q3 March FY26 Quarterly Report’ released to the ASX on 29 April 2026. 1. Ore Reserves are based on a silver price of US$20/oz Ag. 2. Cut-off grades: Simberi based on a $0/t net revenue, including silver revenue. 3. Mineral Resources are reported inclusive of Ore Reserves. 4. Rounding may result in apparent summation differences between tonnes, grade and contained metal. Proved Probable Total Deposit Tonnes (Mt) Grade (g/t Ag) Ounces (000’s) Tonnes (Mt) Grade (g/t Ag) Ounces (000’s) Tonnes (Mt) Grade (g/t Ag) Ounces (000’s) Simberi Oxide 4.6 1.6 230 2.1 2.3 155 6.6 1.8 380 Simberi Sulphide 5.0 3.0 490 10.3 4.7 1,555 15.3 4.2 2,045 Total Simberi 9.6 2.3 720 12.3 4.3 1,710 21.9 3.5 2,425
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Simberi Silver Mineral Resources 28 Measured Indicated Inferred Total Deposit Tonnes (Mt) Grade (g/t Ag) Ounces (000’s) Tonnes (Mt) Grade (g/t Ag) Ounces (000’s) Tonnes (Mt) Grade (g/t Ag) Ounces (000’s) Tonnes (Mt) Grade (g/t Ag) Ounces (000’s) Simberi Oxide 6.5 2.2 460 7.5 4.1 985 1.5 2.4 115 15.4 3.2 1,560 Simberi Sulphide 13.7 2.8 1,225 35.6 4.1 4,685 2.5 1.9 150 51.7 3.6 6,060 Total Simberi 20.2 2.6 1,685 43.0 4.1 5,670 3.9 2.1 265 67.1 3.5 7,620 Note: Silver Mineral Resources – 50% Attributable basis for Simberi. Mineral Resource Estimates are extracted from the report titled ‘Q3 March FY26 Quarterly Report’ released to the ASX on 29 April 2026. 1. Mineral Resources are reported inclusive of Ore Reserves. 2. Cut-off Grades Simberi Oxide (0.4 g/t Au), Simberi Sulphide (0.6 g/t Au). 3. All Mineral Resources are reported constrained by a US$2,500/oz pit shell. 4. Rounding may result in apparent summation differences between tonnes, grade and contained metal.
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Atlantic Gold Ore Reserves 29 Note: Gold Ore Reserves – 100% basis for Atlantic. Atlantic Ore Reserves are extracted from the report titled “15-Mile Pre-Feasibility Study and Ore Reserve Update”. released to the ASX on 28 September 2026. 1. Ore Reserves are based on a gold price of: Atlantic (US$2,000/oz for 15-Mile Mine, Old Mitchell Mine and Old Austen Mine, and US$3,000/oz for Touquoy stockpiles) 2. Cut-off grades: Atlantic Mining (0.3 g/t Au for 15-Mile Mine, 0.4g/t Au for Old Mitchell Mine and Old Austen Mine and 0.23g/t for Touquoy stockpiles). 3. Mineral Resources are reported inclusive of Ore Reserves. 4. Rounding may result in apparent summation differences between tonnes, grade and contained metal. Proved Probable Total Deposit Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) 15-Mile Mine - - - 23.6 1.1 860 23.6 1.1 860 Old Mitchell Mine 8.1 1.1 290 1.6 1.0 50 9.6 1.1 340 Old Austen Mine 4.1 1.3 170 1.4 1.6 70 5.5 1.3 240 Touquoy Stockpiles 3.0 0.4 40 - - - 3.0 0.4 40 Total Atlantic 15.2 1.2 500 26.6 1.2 980 41.7 1.1 1,480
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Atlantic Gold Mineral Resources 30 Measured Indicated Inferred Total Deposit Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) Tonnes (Mt) Grade (g/t Au) Ounces (000’s) 15-Mile Mine - - - 30.2 1.2 1,190 5.5 1.1 200 35.7 1.2 1,390 Old Mitchell Mine 13.2 1.2 510 3.3 1.4 150 - - - 16.5 1.2 660 Old Austen Mine 4.4 1.4 190 5.2 1.4 230 0.6 1.9 40 10.2 1.4 460 Total Atlantic 17.6 1.2 700 38.7 1.3 1,570 6.1 1.2 240 62.4 1.2 2,510 Note: Gold Mineral Resources – 100% basis for Atlantic. Atlantic Mineral Resource Estimates are extracted from the report titled ‘15-Mile Processing Hub Mineral Resources Estimate Increases 24% to 2.5 Moz’ released to the ASX on 28 July 2026. 1. Mineral Resources are reported inclusive of Ore Reserves. 2. Cut-off Grades Atlantic Operations (0.3 g/t Au) 3. All Mineral Resources are reported constrained by a US$2,500/oz pit shell. 4. Rounding may result in apparent summation differences between tonnes, grade and contained metal.
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Contact Information 31 INVESTOR RELATIONS David Cotterell General Manager Business Development & Investor Relations T: +61 3 8660 1959 M: +61 447 644 648 E: info@stbarbara.com.au MEDIA RELATIONS Sodali & Co. Paul Ryan M: +61 409 296 511