DIATREME RESOURCES LIMITED — M&A Activity 2024

May 20, 2024

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21 May 2024

Market Announcements Office ASX Limited 20 Bridge Street Sydney NSW 2000

Dear Sir/Madam

Takeover bid by Diatreme Resources Limited for Metallica Minerals Limited Notice of Minimum Acceptance Condition fulfilled

Attached, by way of service pursuant to section 630(5)(b) of the Corporations Act 2001 (Cth) ( Corporations Act ), is a notice that the minimum acceptance condition of Diatreme Resources Limited’s off-market takeover bid for all the ordinary shares in Metallica Minerals Limited has been fulfilled, as required by section 630(4) of the Corporations Act.

Yours sincerely

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Tuan Do Company Secretary

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DIATREME RESOURCES LIMITED ACN 061 267 061

To: Metallica Minerals Limited ACN 076 696 092 ( Metallica

ASX Limited

NOTICE OF CONDITION FULFILLED

SECTION 630(4) CORPORATIONS ACT 2001 (CTH)

This notice is given by Diatreme Resources Limited ACN 061 267 061 ( Diatreme ) in respect of the offers dated 11 April 2024 made by Diatreme under its off-market takeover bid to acquire all of the ordinary shares in Metallica ( Offers ). The Offers are contained in Diatreme’s bidder’s statement dated 28 March 2024 (as varied by notice dated 17 May 2024 and supplemented by the first supplementary bidder’s statement dated 10 April 2024, second supplementary bidder’s statement dated 17 April 2024 and third supplementary bidder’s statement dated 8 May 2024) ( Bidder’s Statement ). Unless the context requires otherwise, terms defined in the Bidder’s Statement have the same meaning in this notice.

Diatreme hereby gives notice under section 630(4) of the Corporations Act 2001 (Cth) that the Condition in paragraph 1 (Minimum acceptance) of Schedule 2 of the Bidder’s Statement has been fulfilled so that the Offers have become free of that Condition.

Dated 21 May 2024

Signed for and on behalf of

Diatreme Resources Limited

by:

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Tuan Do Company Secretary