GREAT BOULDER RESOURCES LIMITED — Proxy Solicitation & Information Statement 2026

May 12, 2026

Great Boulder

RESOURCES LIMITED

CHAIRMAN'S LETTER TO SHAREHOLDERS

13 May 2026

Dear Shareholder

I urge all shareholders to vote “for” resolutions 1, 2 and 3 at the EGM to show your support for the acquisition of Peak Hill.

It is my pleasure to invite you to attend this Extraordinary General Meeting (EGM) for Great Boulder Resources Ltd. The EGM is an important milestone in the Company's history as it marks a truly transformational event that will elevate Great Boulder from being a junior explorer to an emerging gold producer.

Transformational Transaction

The acquisition of the Peak Hill Gold Project from Westgold Resources is a fantastic opportunity for Great Boulder. Peak Hill's location 100km north of our Side Well Gold Project means it forms a very complementary addition to our Meekatharra projects. Acquiring resource ounces on granted mining leases gives Great Boulder a clear line of sight to commence mining and deliver ore to Westgold's regional processing infrastructure.

Great Boulder is targeting "Mining Ready" status at the Peak Hill Gold Project within 12 months, leveraging existing geological data, streamlined permitting and mining studies, plus an Ore Purchase Agreement (OPA) with Westgold Resources.

Having not been mined since 1997 when the gold price was in a long-term downturn, Peak Hill presents potential near-term exploration upside, a key advantage for Great Boulder given its history of exploration success at Side Well.

In addition to these benefits the Peak Hill acquisition includes a non-binding strategic collaboration agreement that will allow Great Boulder and Westgold to work together to potentially fast-track our growing Side Well Gold Project towards capital light production.

Following completion of the acquisition and completion of the Placement we will be well funded with approximately $25 million cash at bank and the next 6-12 months will be milestone rich. The Company plans to execute an aggressive drilling campaign (with up to 6 rigs planned spread across Peak Hill and Side Well, for 60,000m of drilling) and to also rapidly progress pre-production activities.

Voting

Details of the items of business at the EGM are contained in the Notice of Meeting. Shareholders will be able to attend and vote in person, or vote beforehand by completing the voting proxy form which will be sent you to by Automic.

Board Recommendation

I urge all shareholders to vote “for” resolutions 1, 2 and 3 at the EGM to show your support for the acquisition of Peak Hill. Should you have any queries regarding this Notice, please contact our Company Secretary, Melanie Ross on +61 9321 6037 or by email to melanie.ross@greatboulder.com.au.

The Notice of Meeting is important and should be read in its entirety. If you are in doubt as to the course of action you should follow, you should consult your financial adviser, lawyer, accountant or other professional adviser.

Chris Tuckwell
Chairman
Great Boulder Resources Ltd

ASX Code: GBR
P: +61 8 9321 6037
Contact: Andrew Paterson, Managing Director
PO Box 677, West Perth 6872, Western Australia
E: admin@greatboulder.com.au
ABN 70 611 695 955
GREATBOULDER.COM.AU