MASTERMYNE GROUP LIMITED — Capital/Financing Update 2025

Sep 23, 2025

24 September 2025

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MASTERMYNE GROUP LIMITED (ASX CODE: MYE) CONTRACT AWARDS

Mastermyne Group Limited (ASX Code: MYE) (“Mastermyne” or “the Company”), is pleased to advise of the following contract awards:

• Further to the Company’s update on 28 August 2025, Anglo American Steelmaking Coal has now confirmed the 6 month extension of the Company’s contracts in relation to its three underground operations until April 2026. The value of these contract extensions is estimated to be in the order of $31 million.

• The Company has also recently executed a 3 year (plus extensions) agreement with Yancoal Australia in relation to outbye, ventilation and strata consolidation services at Ashton, Moolarben and Abel mines in New South Wales, with an estimated value over the initial contract term in the order of $15 to $20 million.

Jeff Whiteman, Managing Director and Chief Executive Officer, commented: “We are delighted to be continuing our long-term relationship with Anglo American Steelmaking Coal and formalising our commercial arrangements with Yancoal, with whom we have been developing a working relationship for some while. These developments align well with our vision to be a valued partner in underground coal mining.”

Approved for distribution by the Board of Directors of Mastermyne Group Limited.

Andrew Ritter, Company Secretary

Further information:

Jeff Whiteman, Managing Director and Chief Executive Officer – 07 4963 0400

Matt Ruhl, Chief Financial Officer – 07 4963 0400

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