'Stage 1' Resources at Central Gawler Mill Pass 300koz Au

Feasibility studies to begin shortly | Targeting operations by end of 2026

HIGHLIGHTS

• Challenger JORC (2012) Mineral Resources Estimate (MRE) grows to 313koz Au (10.6Mt @ 0.92 g/t), incl. 194koz Au (1.87Mt @ 3.23 g/t) in existing open pit and underground mines:

  • Challenger Main Open Pit: 70,000oz Au (0.65Mt @ 3.36 g/t Au);

  • Challenger West Open pit: 11,600oz Au (0.03Mt @ 10.7 g/t Au);

  • Challenger Underground (above 215mRL): 89,400oz Au (0.98Mt @ 2.84 g/t Au); and

  • Challenger Deeps (below 90mRL): 23,000oz Au (0.21Mt @ 3.50 g/t Au).

• Almost all MRE mineralisation located in, on, or adjacent to, existing serviceable open pit and underground development - opportunities for low-cost access and production

• Preliminary estimate for full reinstatement of 600ktpa Central Gawler Mill only A$26m (± 30%)

• Targeting lower-cost, de-risked two phase transition to operations, with initial high-grade tailings reprocessing (as Phase 1), followed by restart of fresh rock operations (as Phase 2)

• Technical programs moving directly to definitive Feasibility, targeting operations by end of 2026; conversations underway with financiers for low-dilution credit financing options

ADELAIDE, AUSTRALIA / ACCESS Newswire / September 7, 2025 / Barton Gold Holdings Limited (ASX:BGD)(FRA:BGD3)(OTCQB:BGDFF) (Barton or Company) is pleased to announce an updated MRE for its South Australian Challenger Gold Project (Challenger). This follows detailed remodelling of gold mineralisation on or near existing development drives within the historical Challenger underground mine (below the 900mRL level). This mineralisation was temporarily removed from Barton's recent 30 June 2025 Challenger MRE update, pending final remodelling and re-estimation.

Full details are contained in the complete announcement, which can be accessed on the ASX website, the investor section of Barton's website, or directly by clicking here.

Commenting on the Challenger JORC Resources update, Barton MD Alexander Scanlon said:

"With gold Resources of over 300,000oz now confirmed adjacent to the Central Gawler Mill, the pieces are now in place for the startup of an initial multi-year ‘Stage 1' operation. This represents a significant opportunity for Barton to join a select few of its peers by transitioning to operations at a period of record high gold prices.

"Our fully permitted Central Gawler Mill also offers considerable leverage in successfully delivering this outcome, with a potentially shorter, lower-cost, and lower-risk pathway to operations and BGD's re-rating to 'producer' status. A successful outcome could then generate revenues and cash flow to fund our planned regional growth.

"We are now moving directly to definitive Feasibility studies targeting a two phase, de-risked development and the start of initial ‘Stage 1' operations by the end of 2026. Barton has a very exciting 18 months ahead as we navigate this next stage of our corporate evolution."

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.*

*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.

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 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 in this announcement, 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. 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.

SOURCE: Barton Gold Holdings Limited