Capstone Copper Corp. — Capital/Financing Update 2025

Oct 23, 2025

ASX AnnouncementNEWS RELEASE TSX:CS ● ASX:CSCTSX:CS ● capstonecopper.com

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October 24, 2025

NOTICE UNDER SECTION 708A(5)(e) OF THE CORPORATIONS ACT 2001 (CTH)

Vancouver, British Columbia – Capstone Copper Corp. (ARBN 673 751 490) ( Capstone or the Company ) (TSX: CS) (ASX: CSC) has issued today 1,020,661 fully paid common shares of Capstone at an issue price of US$9.797 per share ( New Shares ) to OMF Fund IV SPV E LLC ( Orion ) in connection with Orion’s agreement to acquire 25% of 0908113 B.C. Ltd., an indirect wholly-owned subsidiary of Capstone, which owns 100% of the fully-permitted and construction ready Santo Domingo project and the Sierra Norte project, as announced to the ASX on October 13, 2025.

The New Shares will be quoted on TSX but may be transmuted to CHESS Depository Interests ( CDIs ) in Capstone quoted on ASX at any time by the relevant holder.

Capstone seeks to rely on section 708A of the Corporations Act 2001 (Cth) ( Corporations Act ) (modified by ASIC Class Order [CO 14/827] and ASIC Instrument 24-0549 (together, the ASIC Instruments ) with respect to the on-sale of any CDIs which are transmuted from the New Shares (in the event that such transmutation occurs).

Capstone confirms that:

• 1 The New Shares were issued without disclosure under Part 6D.2 of the Corporations Act.

• 2 This notice is being given under section 708A(5)(e) of the Corporations Act (as modified by the ASIC Instruments).

• 3 As at the date of this notice Capstone has complied with:

  • (a) section 601CK of the Corporations Act;

  • (b) the continuous disclosure obligations contained in Sec 408 of the Company Manual of the TSX; and

  • (c) its obligations under rule 1.15.2 of the listing rules of ASX.

• 4 As at the date of this notice, there is no excluded information of the type referred to in sections 708A(7) (as modified by the ASIC instruments) and 708A(8) of the Corporations Act that is required to be set out in this notice under section 708A(6)(e) of the Corporations Act.

This cleansing notice has been authorised for release by:

Wendy King

Senior Vice President, Risk, ESG, General Counsel and Corporate Secretary

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Capstone Copper Corp. (ARBN 673 751 490) company incorporated in British Columbia, Canada with its registered office at Suite 2100, 510 West Georgia Street, Vancouver BC V6B 0M3, Canada.