HIGHLIGHTS

• May 2025 Optimised Scoping Study (OSS) outlined a compelling Tunkillia development project:^[1]

  • Annual production: ~120,000oz gold and ~250,000oz silver

  • Total LoM operating cash: ~A$2.7 billion (unlevered, pre-tax)

  • Net Present Value (NPV_7.5%): ~A$1.4 billion (unlevered, pre-tax)

  • Internal Rate of Return (IRR): ~73.2% (unlevered, pre-tax); and

  • Payback period: ~0.8 years (unlevered, pre-tax)

• Barton expediting Tunkillia toward Mining Lease (ML) application, with AUD gold and silver prices now over $2,000/oz and $60/oz higher (respectively) than used for OSS revenue estimates¹

• 18,900m ‘Phase 1' reverse circulation (RC) Resource upgrade drilling infilled high value S1 / S2 pit areas with broad high-grade intersections, supporting rapid payback in early ‘Starter pit'²; ~30,000m ‘Phase 2' RC upgrade drilling now underway targeting balance of optimised open pits;

• Phase 2 RC drilling a key step to support JORC (2012) Mineral Resource upgrades and target JORC (2012) Ore Reserves, a pre-feasibility study (PFS), and an ML application by end of 2026

ADELAIDE, AU / ACCESS Newswire / March 15, 2026 / Barton Gold Holdings Limited (ASX:BGD)(OTCQB:BGDFF)(FRA:BGD3) (Barton or Company) is pleased to announce the start of ‘Phase 2' JORC (2012) Mineral Resource upgrade drilling at its South Australian Tunkillia Gold Project (Tunkillia). Strike Drilling has been engaged to complete a program totalling ~30,000m.

Tunkillia's Phase 2 RC upgrade drilling follows a successful 'Phase 1' program which infilled the high-value early 'S1' and 'S2' pit areas, modelled to produce ~$1.3 billion operating profit during the first 2.5 years of operation, with broad, high-grade intersections. Barton is targeting conversion of all of Tunkillia's OSS modelled open pit mineralisation to JORC (2012) ‘Measured' and ‘Indicated' categories to accelerate financing and development.²

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

Commenting on Tunkillia's ongoing development drilling programs, Barton MD Alexander Scanlon said:

"The Tunkillia OSS demonstrated the financial and capital leverage available to large-scale bulk processing operations, with the major advantage of a higher-grade ‘Starter Pit' that can pay back development costs 2x over in the first year - assuming A$5,000/oz gold and A$50/oz silver prices. At current gold and silver prices, Tunkillia would be modelled to produce over $1 billion operating profit in the first year, and over $2 billion operating profit in the first two years.

"Our recent 'Phase 1' Resource upgrade drilling results further confirmed the mineralisation behind these compelling economics; we are therefore now executing the balance of Tunkillia development drilling programs on an expedited timeline, targeting declared JORC Ore Reserves, a robust PFS, and a Mining Lease application by the end of 2026.

"Following the submission of our Mining Lease application, we will expedite Tunkillia's project finance discussions and work with all key stakeholders including the South Australian Government to bring Tunkillia online as soon as possible. This project can generate substantial economic benefits for Barton and all of our stakeholders, including the State."

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 quality as a Competent Person as defined in the JORC Code 2012 (JORC).

SOURCE: Barton Gold Holdings Limited