Tolmer Yields >100,000 g/t Silver Trial Gravity Concentrate

Metallurgical evaluation started, follow up drilling expedited for mid-May

HIGHLIGHTS

• Preliminary test yields high-grade concentrate grading over 100,000 g/t Ag (10% silver)

• Trial concentrate to support preliminary evaluation of Tolmer petrology and paragenesis utilising scanning electron microscopy (SEM); leading geological consultant engaged

• ~4,000m follow up drilling expedited for May 2026 to infill high-grade assays, test extensions

ADELAIDE, AU / ACCESS Newswire / May 4, 2026 / Barton Gold Holdings Limited (ASX:BGD)(OTCQB:BGDFF)(FRA:BGD3) (Barton or Company) is pleased to announce the results of a preliminary analysis of sample mineralisation collected from drilling at its high-grade Tolmer Silver prospect (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 a discovery hole which yielded a peak intersection of 6m @ 4,747 g/t Ag (plus 4m @ 13.2 g/t Au).¹ The mineralisation from this hole has now been dried, washed with a basic detergent, and panned to produce a concentrate for evaluation utilising scanning electron microscopy, which will assist in designing a full metallurgical testwork program.

This test has produced a concentrate grading >100,000 g/t Ag (~10% silver) from a simple gravity process, without any grinding, roasting or the use of chemical reagents. The ability to produce exceptionally high-grade concentrates without hydrometallurgical or pyrometallurgical processes could have potential implications for low-cost, high-margin operations if this is consistent for the mineralisation.

Barton has now expedited a ~4,000m RC drilling follow up program, anticipated to begin mid-May 2026. The objective is to further develop Tolmer's local geological knowledge, infill data, and test potential extensions indicated by soil assays around numerous drill intercepts exceeding 2,000 gram-metres Ag.¹

Barton notes the above results are from a subsample of prepared materials and are not representative of all Tolmer mineralisation. Comprehensive quantitative metallurgical testwork is required to evaluate potential commercial viability. Barton has engaged a leading geological consultant to conduct a preliminary evaluation of this Tolmer mineralisation and assist in the design of a detailed metallurgical testwork program.

Full details can be accessed in the complete announcement on the ASX website or directly by clicking here.

Commenting on the preliminary Tolmer silver concentrate results, Barton MD Alexander Scanlon said:

"We are excited to receive these exceptional preliminary concentration results. There is clearly something very different going on at Tolmer, not only in terms of the degree of silver enrichment in the oxide and transitional zones, but also as to the dominant presence of primary silver in the veining below the 'western silver zone' observed in recent drilling. This is entirely distinct from the rest of the Tarcoola Goldfield, where gold is dominant, and raises exciting possibilities.

"Detailed metallurgical testwork is now required, but the prospective ability to concentrate Tolmer's silver from just a simple, gravity based process is also exciting. For context, one tonne of concentrate grading over 100,000 g/t Ag would today contain over $300,000 worth of silver - before attributing any value for contained gold by-product credits.

"Our emerging silver portfolio is a potentially significant contributor to our regional strategy. We are excited to now be accelerating our Tolmer investigation in parallel with programs to upgrade our Tolmer gold and silver Resources."

Authorised by the Managing Director of Barton Gold Holdings Limited.

For further information, please contact:

About Barton Gold

Barton 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 Project 313koz Au + fully permitted Central Gawler Mill (CGM) Tarcoola Gold Project 20koz Au in fully permitted open pit mine near CGM Tolmer discovery grades up to 84g/t Au & 17,600g/t Ag Tunkillia Gold Project 1.6Moz Au & 3.1Moz Ag JORC Mineral Resources Competitive 120kozpa gold & 250kozpa silver project Wudinna Gold Project 279koz Au project located southeast of Tunkillia Significant optionality, adjacent to main highway

Competent Persons Statement & Previously Reported Information

The 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).

The 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 Information

This 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.

¹ Refer to ASX announcements dated 27 August 2024, and 30 January, 27 March, 16 April, 5 / 25 August. 24 September and 9 December 2025

* 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 Limited