Baseline Water Monitoring Program Begins at Tunkillia

Advancement of long lead work programs to support ML Application

HIGHLIGHTS

• Recent Tunkillia OSS confirms large-scale gold project yielding $2.7bn operating cash^[1]

Barton accelerating key long-lead PFS and Mining Lease Application programs

ADELAIDE, AUSTRALIA / ACCESS Newswire / June 24, 2025 / Barton Gold Holdings Limited (ASX:BGD)(FRA:BGD3)(OTCQB:BGDFF) (Barton or Company) is pleased to announce the start of baseline water monitoring programs for its South Australian Tunkillia Gold Project (Tunkillia), following the recent publication of Tunkillia's Optimised Scoping Study (OSS).

The Tunkillia OSS identified a compelling large-scale operation with (at an A$5,000/oz gold price): ¹

• average annual production: ~120koz gold and ~250koz silver

• operating free cashflow: A$2.7 billion

• Net Present Value (NPV _7.5% ): A$1.4 billion

• Internal Rate of Return (IRR): 73%

• Payback period: 0.8 years, and

• A ‘Starter' pit producing ~206koz Au for A$825m operating free cash in the first 13 months

Barton recently announced a $3 million equity accretive placement priced at a ~4% premium to its last traded price, and a ~25% premium to its 20 trading day volume weighted average price (VWAP).^[2] The use of those funds is primarily to accelerate Reserve conversation upgrade drilling for Tunkillia's ‘Starter Pit. ² Drilling is anticipated to commence during September 2025, and complete by December 2025.

The baseline water monitoring program is another key long-lead feasibility and approvals work program, with a minimum of two years' worth of baseline water data required prior to start of mining and production. The new Tunkillia water monitoring program will allow Barton to compare new baseline data with historical baseline data collected during prior analyses of the Tunkillia Gold Project.

Commenting on the start of Tunkillia water monitoring, Barton MD Alexander Scanlon said:

"Tunkillia's Optimised Scoping Study has confirmed a large-scale, competitive gold and silver operation with significant economies of scale offering strong financial and capital leverage to a rapidly evolving gold market.

"During the balance of calendar year 2025 we will focus on key long-lead feasibility and approvals programs for Tunkillia, with the objective to submit a Mining Lease Application prior to the end of calendar year 2026.