Share Buyback via Reverse Accelerated Bookbuild

On 19 September 2025, Griffin Mining Ltd ("Griffin" or "the Company") announced a share buyback via a reverse accelerated bookbuild (the "RABB Buyback"). The RABB Buyback remains ongoing with details set out in this announcement and the Company's announcement on 19 September 2025.

The Company has engaged Panmure Liberum Ltd ("Panmure Liberum") to implement the RABB Buyback. Pursuant to the RABB Buyback, Panmure Liberum will purchase, as principal, up to a maximum of 10 million Ordinary Shares (being 5.4 per cent. of the Company's Ordinary Shares) at a price per Ordinary Share to be determined based on the offers received in the Buyback process (the "Purchase Price"). The board has authorised the application of no more than $20 million to execution of the RABB Buyback.

The RABB Buyback is expected to close at 16:35 (BST) on 22nd September 2025 (or other such time as the Company and Panmure Liberum agree). The final number of Ordinary Shares to be purchased, together with the Purchase Price will be agreed at the close of the RABB Buyback at the sole discretion of Griffin and Panmure Liberum, and the results of the RABB Buyback will be announced as soon as practicable thereafter. To the extent that the RABB Buyback is oversubscribed, orders will be scaled back (whether on a pro rata basis or otherwise) at the sole discretion of Griffin and Panmure Liberum.

CREST Shareholders wishing to sell Ordinary Shares as part of the RABB Buyback should inform their broker to contact Panmure Liberum before 16:35 (BST) on 22nd September 2025. Panmure Liberum: +44 (0)20 7886 2500.

Purchase of the Company's Ordinary Shares pursuant to the RABB Buyback will take place following announcement of the result of the RABB Buyback.

The primary purpose of the RABB Buyback is to reduce the share capital of the Company. The Ordinary Shares purchased under the RABB Buyback will be cancelled.

The directors of the Company consider the RABB Buyback to be in the best interests of the Company and of its shareholders generally, with the implementation of the RABB Buyback expected to enhance earnings per share.

Any purchase of Ordinary Shares under the RABB Buyback will be carried out on the London Stock Exchange and shall take place in accordance with the Company's existing general authority to repurchase Ordinary Shares.

The person responsible for arranging the release of this announcement on behalf of the Company is

Roger Goodwin, Finance Director.