North / south extensions indicated by highest-grade mineralisation

HIGHLIGHTS

• ~30,000m Tunkillia ‘Phase 2' reverse circulation (RC) Resource upgrade drilling underway, after ‘Phase 1' infilled highest value S1 and S2 pit areas (in the centre of Area 223) with high-grade intersections^[1]

• First assays from ongoing ‘Phase 2' upgrade drilling include highest-grade results to-date from Area 51 zone, indicating potential growth in Resources, open pit and mine life

• Broadest, highest-grade assays come from north / south ends of currently modelled open pit, indicating significant potential for further extensions of higher value mineralisation

• New assays include:^[2]

• Barton targeting completion of a Pre-Feasibility Study (PFS) before the end of calendar year 2026, to support a Mining Lease (ML) application and expedited project finance conversations¹

ADELAIDE, AU / ACCESS Newswire / May 27, 2026 / Barton Gold Holdings Limited (ASX:BGD)(OTCQB:BGDFF)(FRA:BGD3) (Barton or Company) is pleased to announce the first round of assays received from ‘Phase 2' upgrade drilling at its South Australian Tunkillia Gold Project (Tunkillia). These come from within the currently modelled ‘Area 51' optimised open pit.

These assays include broad intersections which infill the currently modelled Area 51 mineralisation, with the highest-grade assays also indicating potential optimised open pit growth and further high-value extensions.

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

Commenting on the new Tunkillia assay results, Barton Managing Director Alexander Scanlon said:

"Phase 1 drilling already confirmed the higher-grade mineralisation driving Tunkillia's exceptional economics, where its ‘Starter Pit' can repay development 2x over in the first year alone - assuming A$5,000/oz gold and A$50/oz silver.

"We are therefore pleased to report that Area 51 has returned higher-grade results than anticipated, indicating potentially higher-value mineralisation, Resource growth and also extensions of the optimised open pit and mine life.

"Tunkillia is on track for dual gold and silver Resource upgrades, conversion to Ore Reserves, completion of a PFS and a Mining Lease application, all in the context of a considerably more favourable gold and silver price environment."

Tunkillia project background

Tunkillia's May 2025 OSS outlined a compelling Tunkillia development project:^[3]

Within the total project, the S1 and S2 pits are modelled to produce 365,000oz gold, 923,000oz silver and $1.3bn operating free cash during the first ~27 months alone at an average cash cost of only A$1,429/oz Au.^[4] These results assume AUD gold and silver prices of A$5,000 and A$50 per ounce (respectively).

A successful ‘Phase 1' upgrade drilling program has already infilled the high-value early ‘S1' and ‘S2' pit areas (outlined green in Figure 7 below) with broad high-grade intersections, supporting rapid early project payback.^[5]

Tunkillia development programs ongoing

The Phase 2 MRE upgrade drilling program remains underway, targeting ~30,000m RC drilling, with an ongoing ~3,000m diamond drilling (DD) program operating in parallel for geotechnical and metallurgical analyses.^[6]

^{Both programs are targeting completion during June 2026. The objective of the programs are to:}

• upgrade the mineralisation within the Tunkillia OSS optimised open pits to JORC (2012) ‘Measured' and ‘Indicated' categories, for conversion to JORC (2012) Ore Reserves subject to completion of a PFS;^[7]

• infill and expand Tunkillia's geotechnical and metallurgical databases;

• re-optimise open pit design, and support more detailed recovery and production modelling; and

• support the delivery of a high quality PFS, targeting completion before the end of calendar year 2026.

Based upon the results of the PFS, Barton will then prepare a Mining Lease (ML) application, expedite project finance discussions, and work with all key stakeholders to bring Tunkillia into development as soon as possible.

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.*

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 quality 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 readers 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.

[1] Refer to ASX announcements dated 2 / 16 December 2025, and 21 January and 16 March 2026
[2] Refer to ASX announcement dated 5 May 2025 and ASX LR 5.19.2 disclosure detailed on the final page of this announcement
[3] Refer to ASX announcement dated 5 May 2025
[4] Refer to ASX announcement dated 5 May 2025
[5] Refer to ASX announcements dated 2 / 16 December 2025 and 21 January 2026
[6] Refer to ASX announcements dated 16 March and 23 April 2026
[7] Refer to ASX announcements dated 2 / 16 December 2025 and 21 January 2026

SOURCE: Barton Gold Holdings Limited