Greatland Resources Limited

E: [email protected]

W: https://greatland.com.au

: x.com/greatlandgold

NEWS RELEASE | 22 October 2025

Resource Development & Exploration Activities Report

September Quarter 2025

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS STIPULATED UNDER THE UK MARKET ABUSE REGULATIONS.  ON PUBLICATION OF THIS ANNOUNCEMENT VIA A REGULATORY INFORMATION SERVICE, THIS INFORMATION IS CONSIDERED TO BE IN THE PUBLIC DOMAIN.

Strong start to FY26 drilling and exploration

Results from first quarter of the record Telfer drilling program focused on extension and growth potential

Highlights

Telfer Resource Development Drilling

§ FY26 drill program off to a good start, exceeding planned metres drilled with a total of 53,543 metres (resource growth and resource conversion drilling) from 711 holes across West Dome Open Pit, West Dome Underground and Main Dome Underground.

§ Greatland remains on track to deliver the targeted 240,000m of drilling in FY26, with a third reverse circulation (RC) rig mobilised during the quarter and a fifth underground diamond drilling rig mobilising in October.

West Dome Open Pit

§ 25,286m of resource growth drilling completed, targeting extensions to Stage 2 and Stage 7.

§ 16,010m of resource conversion infill drilling completed designed to increase the geological confidence of Stage 7 and Stage 2 extensions.

§ September quarter drilling meters exceeded plan, therefore Stage 7 extension drilling is expected to be completed ahead of schedule, allowing a pivot to Stage 2 extension for the balance of FY26.

West Dome Underground

§ 4,862m of resource growth drilled across nine holes from the highly anticipated second phase of the West Dome Underground drilling campaign, with two rigs allocated for the remainder of FY26.

§ A maiden Mineral Resource Estimate is targeted in the March 2026 quarter.

Main Dome Underground

§ 7,386m drilled across 67 holes of resource conversion and growth drilling during the quarter.

§ Successful delivery of the Eastern Stockwork Corridor (ESC), Central (drilled last quarter) and Tarkin (drilled this quarter) targets to the operations team during the quarter.

§ Resource growth drilling has successfully extended both ESC South and Kylo, with these drill programs ongoing.

Regional Exploration

§ Activities focused on several existing satellite deposits and priority targets in the Paterson region within trucking distance of the Telfer mill.

§ Paterson South Farm-In drill testing of Telfer style targets at Paterson Dome intersected further coherent copper mineralisation. Drill testing of geophysical targets at the Atlantis prospect completed with drilling ongoing at the Teague prospect.

§ Ernest Giles first pass testing of Induced Polarity (IP) anomalies with RC drilling and pre-collars completed with encouraging pathfinder mineralisation identified and diamond tails still to come.

Greatland Managing Director, Shaun Day, commented:

"The September quarter was a great start to our record 240,000m annual drilling program at Telfer, with the results to date further supporting the potential for multi-year Telfer life of mine extension from both open pit and underground opportunities.

The new high-grade zone identified at the West Dome Underground is particularly exciting. The project presents the possibility of an entirely new high-grade underground mining centre beneath the currently active West Dome Open Pit. There is ready access from the Main Dome Underground via the existing development drive already in place and a second one under development, with the ability to link to the existing Main Dome Underground crusher and hoist. We look forward to updating shareholders on the continuing progress of this project.

Our regional exploration results are encouraging and include results from several satellite deposits located on granted mining leases within proximity to the Telfer mill, with the potential to provide optionality for additional ore feed.

We will be mobilising an additional rig this month and are well placed to achieve our drilling targets to inform a significant resource update at Telfer in the March 2026 quarter."

A full version of this release is available for download at https://www.greatland.com.au/investors/announcements/.

Contact

For further information, please contact:

Greatland Resources Limited

Shaun Day, Managing Director  |  Rowan Krasnoff, Chief Development Officer

[email protected]

Nominated Advisor

SPARK Advisory Partners

Andrew Emmott / James Keeshan / Neil Baldwin  |  +44 203 368 3550

Corporate Brokers

Canaccord Genuity  |  James Asensio / George Grainger  |  +44 207 523 8000

RBC Capital Markets  |  James Agnew / Jamil Miah  /  Scott Redwood  |  +44 207 029 0528

Media Relations

Australia - Fivemark Partners  |  Michael Vaughan  |  +61 422 602 720

About Greatland

Greatland is a gold and copper mining company listed on the Australian Securities Exchange and London Stock Exchange's AIM Market (ASX:GGP and AIM:GGP) and operates its business from Western Australia.

The Greatland portfolio includes the 100% owned Telfer mine, the adjacent 100% owned brownfield world-class Havieron gold-copper development project, and a significant exploration portfolio within the surrounding region. The combination of Telfer and Havieron provides for a substantial and long life gold-copper operation in the Paterson Province in the East Pilbara region of Western Australia.