Gunnison Copper Corp. — Proxy Solicitation & Information Statement 2024

May 16, 2024

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Notice-and-Access

The Canadian securities regulators have adopted rules which permit the use of notice-and-access for proxy solicitation instead of the traditional physical delivery of material. This new process provides the option to post meeting related materials including management information circulars, as well as annual financial statements and management’s discussion and analysis on a website in addition to SEDAR+. Under notice-and-access, meeting related materials will be available for viewing for up to 1 year from the date of posting and a paper copy of the material can be requested at any time during this period.

EXCELSIOR MINING CORP has elected to utilize notice-and-access and provide you with the following information: Meeting Date and Time: June 20, 2024 at 09:00 AM (Canada/Pacific Daylight) Meeting Location: 24th Floor, 1055 West Georgia Street Vancouver, BC V6E 3P3 Meeting materials are available electronically at www.sedarplus.ca and also on https://docs.tsxtrust.com/2118.

If you wish to receive a paper copy of the Meeting materials or have questions about notice-and-access please call 1-866-6005869 or email tsxtis@tmx.com. In order to receive a paper copy in time to vote before the meeting, your request should be received by June 11, 2024.

Please follow the instructions accompanying the Voting Instruction Form you receive with respect to returning it.

Disclosure regarding matters to be voted on may be found in the following Sections of the Information Circular.

1. Fixing the Number of Directors and Election of Directors 2. Fixing the Number of Directors and Election of Directors 3. Appointment of Auditor 4. Approval of Greenstone conversion of debt to shares

You should review the Information Circular before voting.

www.tsxtrust.com VANCOUVER CALGARY TORONTO MONTRÉAL

(Detach and Retain top for your records)  EXCELSIOR MINING CORP Request for Financial Statements (“Company”) 2024

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In accordance with National Instrument 51-102 – Continuous Disclosure Obligations, registered and beneficial security holders may elect annually to receive a copy of our annual financial statements and corresponding management discussion and analysis (“MD&A”) or interim financial statements and the corresponding MD&A, or both.

Rather than receiving the financial statements by mail, you may choose to view these documents on the SEDAR+ website at www.sedarplus.ca.www.sedarplus.ca.

IF YOU WISH TO RECEIVE THESE DOCUMENTS BY MAIL, PLEASE Rather than receiving the financial statements by mail, you may choose to view these documents DETACH THIS PORTION AND RETURN THIS COMPLETED FORM TO : on the SEDAR+ website at www.sedarplus.ca.www.sedarplus.ca. TSX Trust Company I HEREBY CERTIFY that I am a registered and/or beneficial holder of the Company, and as such, 301 - 100 Adelaide Street West request that my name be placed on the Company’s Mailing List in respect to its annual and/or interim Toronto ON M5H 4H1 financial statements and the corresponding MD&A for the current financial year. Or by fax to: 416-595-9593

Please send me:  Annual Financial Statements with MD&A  Interim Financial Statements with MD&A

FIRST NAME LAST NAME ADDRESS CITY PROVINCE/STATE POSTAL/ZIP CODE COUNTRY E-MAIL Signature of Security holder DATE (MM/DD/YYYY)