Giant Mining Corp. — Capital/Financing Update 2026

May 19, 2026

Form 51-102F3
MATERIAL CHANGE REPORT

Item 1. Name and Address of Company
Copper One Resources Corp., (formerly, Giant Mining Corp.) (the "Company")
1500 – 1055 West Georgia Street
Vancouver, BC V6E 4N7

Item 2. Date of Material Change
May 14, 2026 and May 19, 2026

Item 3. News Release
The news release announcing the material change described herein was disseminated on May 14, 2026 and subsequently filed on SEDAR+.

Item 4. Summary of Material Change

LIFE Offering Amendment
The Company amended the terms of its previously announced non-brokered private placement offering pursuant to the listed issuer financing exemption under Part 5A.2 of National Instrument 45-106 – Prospectus Exemptions (the "LIFE Offering"), originally announced on May 12, 2026. The price per non-flow-through unit (each, an "NFT Unit") and per flow-through unit (each, an "FT Unit") has been revised from C$0.43 to C$0.40. The LIFE Offering will now consist of up to 2,500,000 NFT Units at a price of C$0.40 per NFT Unit for gross proceeds of up to C$1,000,000 and up to 3,750,000 FT Units at a price of C$0.40 per FT Unit for gross proceeds of up to C$1,500,000, for aggregate amended gross proceeds of up to C$2,500,000.

On May 14, 2026, the Company filed an amended and restated offering document (the "Amended Offering Document") under the Company's profile on SEDAR+ and on the Company's website in connection with the revised terms of the LIFE Offering.

Stock Trading Symbol Change
Effective May 19, 2026, the Company's stock trading symbol on the Canadian Securities Exchange (the "CSE") changed from "BFG" to "CEXY" (the "Symbol Change"), to align with the Company's recently adopted corporate name, Copper One Resources Corp. (formerly Giant Mining Corp.).

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Item 5. Full Description of Material Change

5.1 Full Description of Material Change

LIFE Offering Amendment

The Company has amended the terms of LIFE Offering originally announced on May 12, 2026. The price per NFT Unit and per FT Unit has been revised from C$0.43 to C$0.40. The LIFE Offering will now consist of up to 2,500,000 NFT Units at a price of C$0.40 per NFT Unit for gross proceeds of up to C$1,000,000 and up to 3,750,000 FT Units at a price of C$0.40 per FT Unit for gross proceeds of up to C$1,500,000, for aggregate amended gross proceeds of up to C$2,500,000.

All other terms of the NFT Units, FT Units and Warrants remain unchanged from the terms previously announced on May 12, 2026. The LIFE Offering is expected to close on or around May 30, 2026, as previously announced. For full details regarding the terms of the LIFE Offering, including the composition of the NFT Units and FT Units, use of proceeds, offering jurisdictions, hold periods, and finders' fees, prospective investors should refer to the Amended Offering Document filed under the Company's profile on SEDAR+ and on the Company's website in connection with the revised terms of the LIFE Offering. Prospective investors should read the Amended Offering Document before making an investment decision.

The securities issuable pursuant to the LIFE Offering have not, nor will they be, registered under the United States Securities Act of 1933, as amended (the "U.S. Securities Act"), and may not be offered or sold within the United States or to, or for the account or benefit of, U.S. persons in the absence of U.S. registration or an applicable exemption from the U.S. registration requirements.

Stock Trading Symbol Change

Effective May 19, 2026, the Company's CSE ticker symbol changed from "BFG" to "CEXY". The Symbol Change was undertaken to align the Company's ticker symbol with its recently adopted corporate name, "Copper One Resources Corp." (formerly Giant Mining Corp.). The Company's OTC symbol (BFGFF) and Frankfurt Stock Exchange symbol (YW5) remain unchanged.

The Company recently completed a change of its corporate name from "Giant Mining Corp." to "Copper One Resources Corp." The Symbol Change reflects this transition and is intended to ensure that the Company's trading symbol is consistent with its new corporate identity.

The Company believes the Symbol Change will enhance its visibility and better align with its new corporate identity and strategic focus in the copper sector, supporting broader market recognition among investors and stakeholders interested in critical minerals for electrification and energy transition initiatives.

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5.2 Disclosure for Restructuring Transactions

Not applicable.

Item 6. Reliance on subsection 7.1(2) of National Instrument 51-102

Not applicable.

Item 7. Omitted Information

None.

Item 8. Executive Officers

David Greenway
President and CEO
Telephone: (855) 475-0745

Item 9. Date of Report

DATED at Vancouver, BC, this 19 day of May, 2026