Capstone Copper Corp. — Proxy Solicitation & Information Statement 2025

Mar 21, 2025

CAPSTONE COPPER

Capstone Copper Corp.

ARBN 673 751 490

For all enquiries call:

(within Australia) 1300 850 505

(outside Australia) +61 3 9415 4000

*** Exercise Your Right to Vote ***

IMPORTANT NOTICE Regarding the Availability of Proxy Materials for the Shareholder Meeting to be held on 2 May 2025

Meeting Information

Meeting Type: 2025 Annual General Meeting

For holders as of: 11 March 2025

Date: 2 May 2025

Time: 11:00am (Pacific Time)

Location: 510 West Georgia Street, Suite 2100, Vancouver, British Columbia

You are receiving this communication because you hold CDIs in Capstone Copper Corp. This is not a ballot. You cannot use this notice to vote the shares underlying the CDIs. This communication presents only an overview of the more complete proxy materials that are available to you on the internet. You may view the proxy materials online at www.investorvote.com.au or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting.

For your vote to be effective it must be received by 11.00am (Australian Eastern Standard Time) on Wednesday, 30 April 2025.

See the reverse side of this notice to obtain proxy materials and voting instructions →

To vote online, 24 hours a day, 7 days a week: www.investorvote.com.au
☑ Cast your vote ☑ Access the meeting documents ☑ Review and update your securityholding	Your secure access information is: Control Number: 184784 SRN/HIN: PLEASE NOTE: For security reasons it is important that you keep your SRN/HIN confidential.

316369_0_COSMOS_Sample_Proxy/000001/000001

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CSC

Before You Vote

How to Access the Proxy Materials

Proxy Materials Available to VIEW or RECEIVE:

CDI Voting Instruction Form, Notice of Meeting and Information Circular, Annual Financial Statements

How to View Online:

Have the 6-Digit Control Number available (located on the front of this document) and visit: www.investorvote.com.au

How to Request and Receive a PAPER or E-MAIL Copy:

If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:

1) BY TELEPHONE: (within Australia) 1300 850 505 or (outside Australia) +61 9415 4000
2) BY E-MAIL*: Web.Queries@computershare.com.au

Please make the request as instructed above on or before 5.00pm on Tuesday, 22 April 2025 (Australian Eastern Daylight Time) to facilitate timely delivery.

*If requesting materials by e-mail, please send an e-mail containing your registered name, address and SRN/HIN.

How To Vote

Please Choose One of the Following Voting Methods

Vote By Internet: To vote now by internet, go to www.investorvote.com.au. Have the 6-Digit Control Number available and follow the instructions.

Vote By Mail: You can vote by mail using the CDI voting instruction form included in this mailpack.

Voting Items

The Board of Directors recommends you vote FOR the following:

1. Number of Directors
   To Set the Number of Directors at eight (8).

2. Election of Directors

3. Alison Baker
4. Gordon Bell
5. Richard Coleman
6. Anne Giardini
7. John MacKenzie
8. Cashel Meagher
9. Peter Meredith

10. Patricia Palacios

11. Appointment of Auditors
    Appointment of Deloitte LLP as Auditors of the Corporation for the ensuing year and authorizing the Directors to fix their remuneration.

12. Say on Pay
    Passing an advisory vote on the Corporation's approach to executive compensation, as more particularly described in the accompanying Information Circular.

NOTE: Such other business as may properly come before the meeting or any adjournment thereof.