Drilling Completed at High-Grade Tolmer Silver Discovery

Follow up drilling targeting infill, extensions of a high-grade mineralisationHIGHLIGHTS3,677m RC drilling program completed, targeting extensions of Tolmer's high-grade silver; mineralisation confirmed in numerous prior drilling assays exceeding 2,000 gram-metres Ag1Recent preliminary test yields high-grade concentrate over 100,000 g/t Ag (10% silver)1 ADELAIDE, AU / ACCESS Newswire / June 10, 2026 / Barton Gold Holdings Limited (ASX:BGD)(OTCQB:BGDFF)(FRA:BGD3) (Barton or Company) is pleased to announce the completion of expedited follow up drilling at its high-grade Tolmer Silver discovery (Tolmer), located at its South Australian Tarcoola Gold Project (Tarcoola). Tolmer is one of Australia's highest-grade modern silver discoveries, identified during 2025 in an intersection of 6m @ 4,747 g/t Ag from only 46m depth.1A total 3,677m reverse circulation (RC) drilling was completed across 33 holes. Drilling was targeted to infill the high-grade zone on a different orientation, test continuity and a potential new interpretation of local geological controls, and to test potential extensions of this mineralisation along the newly inferred 'strike' of this zone. Full details can be accessed in the complete announcement on the ASX website or directly by clicking here.Commenting on the completion of Tolmer drilling, Barton MD Alexander Scanlon said:"We are excited to advance Tolmer after 2025 drilling yielded several of the highest grade silver assays globally. Work is also underway to upgrade our Tunkillia silver Resources and convert these to Ore Reserves. These silver assets are potentially a significant contributor to our future regional strategy, whether on a complementary or standalone basis." Figure 1 - Tolmer map w/ Pb background, Ag contours (white), prior drilling (black) & new drilling (red)11 Refer to ASX announcements dated 27 Aug 2024, and 30 Jan, 27 Mar, 16 Apr, 5 / 25 Aug, 24 Sept and 9 Dec 2025, and 5 May 2026Authorised by the Managing Director of Barton Gold Holdings Limited.Alexander ScanlonManaging Directora.scanlon@bartongold.com.au+61 425 226 649Jade Cook Company Secretarycosec@bartongold.com.au+61 8 9322 1587About Barton GoldBarton Gold is an ASX, OTCQB and Frankfurt Stock Exchange listed Australian gold developer targeting future gold production of 150,000ozpa with 2.2Moz Au & 3.1Moz Ag JORC Mineral Resources (79.9Mt @ 0.87g/t Au), brownfield mines, and 100% ownership of the region's only gold mill in the renowned Gawler Craton of South Australia.*Challenger Gold Project313koz Au + fully permitted Central Gawler Mill (CGM)Tarcoola Gold Project20koz Au in fully permitted open pit mine near CGMTolmer discovery grades up to 84g/t Au & 17,600g/t AgTunkillia Gold Project1.6Moz Au & 3.1Moz Ag JORC Mineral ResourcesCompetitive 120kozpa gold & 250kozpa silver projectWudinna Gold Project279koz Au project located southeast of TunkilliaSignificant optionality, adjacent to main highway Competent Persons Statement & Previously Reported InformationThe information in this announcement that relates to the historic Exploration Results and Mineral Resources as listed in the table below is based on, and fairly represents, information and supporting documentation prepared by the Competent Person whose name appears in the same row, who is an employee of or independent consultant to the Company and is a Member or Fellow of the Australasian Institute of Mining and Metallurgy (AusIMM), Australian Institute of Geoscientists (AIG) or a Recognised Professional Organisation (RPO). Each person named in the table below has sufficient experience which is relevant to the style of mineralisation and types of deposits under consideration and to the activity which he has undertaken to qualify as a Competent Person as defined in the JORC Code 2012 (JORC).ActivityCompetent PersonMembershipStatusTarcoola Mineral Resource (Stockpiles)Dr Andrew Fowler (Consultant)AusIMMMemberTarcoola Mineral Resource (Perseverance Mine)Mr Ian Taylor (Consultant)AusIMMFellowTarcoola Exploration Results (until 15 Nov 2021)Mr Colin Skidmore (Consultant)AIGMemberTarcoola Exploration Results (after 15 Nov 2021)Mr Marc Twining (Employee)AusIMMMemberTunkillia Exploration Results (until 15 Nov 2021)Mr Colin Skidmore (Consultant)AIGMemberTunkillia Exploration Results (after 15 Nov 2021)Mr Marc Twining (Employee)AusIMMMemberTunkillia Mineral ResourceMr Ian Taylor (Consultant)AusIMMFellowChallenger Mineral Resource (above 215mRL)Mr Ian Taylor (Consultant)AusIMMFellowChallenger Mineral Resource (below 90mRL)Mr Dale SimsAusIMM / AIGFellow / MemberWudinna Mineral Resource (Clarke Deposit)Ms Justine TraceyAusIMMMemberWudinna Mineral Resource (all other Deposits)Mrs Christine StandingAusIMM / AIGMember / MemberThe information relating to historic Exploration Results and Mineral Resources in this announcement is extracted from the Company's Prospectus dated 14 May 2021 or as otherwise noted, available from the Company's website at www.bartongold.com.au or on the ASX website www.asx.com.au. The Company confirms that it is not aware of any new information or data that materially affects the Exploration Results and Mineral Resource information included in previous announcements and, in the case of estimates of Mineral Resources, that all material assumptions and technical parameters underpinning the estimates, and any production targets and forecast financial information derived from the production targets, continue to apply and have not materially changed. In accordance with ASX Listing Rule 5.19.2, the Company further confirms that the material assumptions underpinning any production targets and the forecast financial information derived therefrom continue to apply and have not materially changed. The Company confirms that the form and context in which the applicable Competent Persons' findings are presented have not been materially modified from the previous announcements.Cautionary Statement Regarding Forward-Looking InformationThis document may contain forward-looking statements. Forward-looking statements are often, but not always, identified by the use of words such as "seek", "anticipate", "believe", "plan", "expect", "target" and "intend" and statements than an event or result "may", "will", "should", "would", "could", or "might" occur or be achieved and other similar expressions. Forward-looking information is subject to business, legal and economic risks and uncertainties and other factors that could cause actual results to differ materially from those contained in forward-looking statements. Such factors include, among other things, risks relating to property interests, the global economic climate, commodity prices, sovereign and legal risks, and environmental risks. Forward-looking statements are based upon estimates and opinions at the date the statements are made. Barton undertakes no obligation to update these forward-looking statements for events or circumstances that occur subsequent to such dates or to update or keep current any of the information contained herein. Any estimates or projections as to events that may occur in the future (including projections of revenue, expense, net income and performance) are based upon the best judgment of Barton from information available as of the date of this document. There is no guarantee that any of these estimates or projections will be achieved. Actual results will vary from the projections and such variations may be material. Nothing contained herein is, or shall be relied upon as, a promise or representation as to the past or future. Any reliance placed by the reader on this document, or on any forward-looking statement contained in or referred to in this document will be solely at the reader's own risk, and readers are cautioned not to place undue reliance on forward-looking statements due to the inherent uncertainty thereof.* Refer to Barton Prospectus dated 14 May 2021 and ASX announcement dated 8 September 2025. Total Barton JORC (2012) Mineral Resources include 1,049koz Au (39.7Mt @ 0.82 g/t Au) in Indicated category and 1,186koz Au (40.2Mt @ 0.92 g/t Au) in Inferred category, and 3,070koz Ag (34.5Mt @ 2.80 g/t Ag) in Inferred category as a subset of Tunkillia gold JORC (2012) Mineral Resources.SOURCE: Barton Gold Holdings LimitedView the original press release on ACCESS Newswire

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