Zone II Production Commenced

8th Floor, 54 Jermyn Street, London, SW1Y 6LX. United Kingdom

Telephone: + 44 (0)20 7629 7772 Facsimile: + 44 (0)20 7629 7773

Email: [email protected]

21st April 2026

Zone II Production Commenced

Griffin Mining Limited ("Griffin" or the "Company) is extremely pleased to announce that the first production blast in Zone II was successfully completed on the 20th April 2026 marking a key milestone in the commissioning and final safety approval process of Zone II in accordance with governing Chinese regulations. All statutory mandated mine development, totalling 19.4 kilometres and ventilation shafts totalling 625 metres, were completed on the 15th April 2026. Ore is now expected to be mined continuously from Zone II for the duration of the current mining licence running to 2054.

Chairman's Statement

Chairman Mladen Ninkov commented, "This is a proud and momentous day for the Company, it's shareholders, the Caijiaying Mine and it's staff and contractors. It's importance cannot be overstated as the Caijiaying Mine moves to a second source of ore to 2054. I am delighted for all concerned"

Further information

Griffin Mining Limited

Mladen Ninkov - Chairman Telephone: +44(0)20 7629 7772

Roger Goodwin - Finance Director

Panmure Liberum Limited - Nominated Adviser & Joint Broker Telephone: +44 (0)20 7886 2500

James Sinclair-Ford

Zak Wadud

Berenberg - Joint Broker Telephone: +44(0)20 3207 7800

Matthew Armitt

Jennifer Lee

This announcement contains inside information for the purposes of Article 7 of the Market Abuse Regulation (EU) No. 596/2014

Griffin Mining Limited's shares are quoted on the Alternative Investment Market (AIM) of the London Stock Exchange (symbol GFM)

The Company's news releases are available on the Company's web site: www.griffinmining.com