File: Attachment 2025 06 01 Change in CFO and advisory agmt.pdf

TSX Venture Exchange Symbol: AME Suite 701 1500 West Georgia Street Vancouver, B.C. V7Y 1C6 Canada Tel: 604.682.0301

email: info@amemining.com website: www.amemining.com

Abacus Announces Appointment of Niina Makela as Chief Financial Officer

Vancouver, BC June 1, 2025. Abacus Mining & Exploration Corporation ("Abacus" or the "Company") (TSXV:AME) is pleased to announce the appointment of Niina Makela as Chief Financial Officer ("CFO") of the Company, effective June 1, 2025.

Ms. Makela is a Vancouver-based accountant with over 15 years of experience in the resource sector, including serving as Senior Accountant to the Company since 2012. In the past, she has served as CFO for Maritime Resources Corp. and as Controller/Senior Accountant to various private and public mineral exploration companies.

"On behalf of Abacus and its Board of Directors, I am very pleased to continue working with Ms. Makela in her new capacity of CFO." stated Paul Anderson, President and CEO of Abacus.

The Company would also like to sincerely thank Jeannine Webb for her valuable contributions and dedication to the Company over the past 11 years. Ms. Webb will continue with the Company as an advisor to management and to the Board.

On Behalf of the Board, ABACUS MINING & EXPLORATION CORPORATION

Paul G. Anderson, P.Geo. President, CEO and Director

About Abacus

Abacus is a mineral exploration and mine development company currently focused on copper and gold in B.C. and Nevada. The Company's main asset is a 20% ownership interest, together with KGHM Polska Mied S.A. (80%), in the proposed copper-gold Ajax Mine located southwest of Kamloops, B.C., which has undergone a joint provincial and federal environmental assessment process. On December 14, 2017, a decision was made by the B.C. Minister of Environment and Climate Change Strategy and the Minister of Energy, Mines and Petroleum Resources to decline to issue an environmental assessment certificate for the Project. KGHM have recently reopened an office in Kamloops, B.C. to facilitate First Nation, community and governmental engagement in order to advance the project towards a potential resubmission of the environmental application.

Abacus also owns a 100% interest in the Willow copper-gold property located near Yerington, Nevada, and it controls the contiguous Nev-Lorraine claims subject to a ten-year lease agreement.

For the latest reports and information on Abacus' projects, please refer to the Company's website at www.amemining.com.

Forward-Looking Information This release includes certain statements that are deemed "forward-looking statements". All statements in this release, other than statements of historical facts, that address events or developments that Abacus expects to occur, are forward-looking statements. Forward-looking statements are statements that are not historical facts and are generally, but not always, identified by the words "expects", "plans", "anticipates", "believes", "intends", "estimates", "projects", "potential" and similar expressions, or that events or conditions "will", "would", "may", "could" or "should" occur. Although the Company believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements are not guarantees of future performance and actual results may differ materially from those in the forward-looking statements. Factors that could cause the actual results to differ materially from those in forward-looking statements include changes to commodity prices, mine and metallurgical recovery, operating and capital costs, foreign exchange rates, ability to obtain required permits on a timely basis, exploitation and exploration successes, continued availability of capital and financing, and general economic, market or business conditions. Investors are cautioned that any such statements are not guarantees of future performance and actual results or developments may differ materially from those projected in the forward-looking statements. Forward-looking statements are based on the beliefs, estimates and opinions of the Company's management on the date the statements are made. Except as required by applicable securities laws, the Company undertakes no obligation to update these forward-looking statements in the event that management's beliefs, estimates or opinions, or other factors, should change.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

File: '\\swfile\EmailIn\20250601 110422 Attachment 2025 06 01 Change in CFO and advisory agmt.docx'

TSX Venture Exchange Symbol: AME

Suite 701 - 1500 West Georgia Street Vancouver, B.C. V7Y 1C6 Canada Tel: 604.682.0301

email: info@amemining.com website: www.amemining.com

Abacus Announces Appointment of Niina Makela as Chief Financial Officer

Vancouver, BC - June 1, 2025. Abacus Mining & Exploration Corporation ("Abacus" or the "Company") (TSXV:AME) is pleased to announce the appointment of Niina Makela as Chief Financial Officer ("CFO") of the Company, effective June 1, 2025.

Ms. Makela is a Vancouver-based accountant with over 15 years of experience in the resource sector, including serving as Senior Accountant to the Company since 2012. In the past, she has served as CFO for Maritime Resources Corp. and as Controller/Senior Accountant to various private and public mineral exploration companies.

"On behalf of Abacus and its Board of Directors, I am very pleased to continue working with Ms. Makela in her new capacity of CFO." stated Paul Anderson, President and CEO of Abacus.

The Company would also like to sincerely thank Jeannine Webb for her valuable contributions and dedication to the Company over the past 11 years. Ms. Webb will continue with the Company as an advisor to management and to the Board.

On Behalf of the Board,

ABACUS MINING & EXPLORATION CORPORATION

Paul G. Anderson, P.Geo. President, CEO and Director

About Abacus

Abacus is a mineral exploration and mine development company currently focused on copper and gold in B.C. and Nevada. The Company's main asset is a 20% ownership interest, together with KGHM Polska Miedz S.A. (80%), in the proposed copper-gold Ajax Mine located southwest of Kamloops, B.C., which has undergone a joint provincial and federal environmental assessment process. On December 14, 2017, a decision was made by the B.C. Minister of Environment and Climate Change Strategy and the Minister of Energy, Mines and Petroleum Resources to decline to issue an environmental assessment certificate for the Project. KGHM have recently reopened an office in Kamloops, B.C. to facilitate First Nation, community and governmental engagement in order to advance the project towards a potential resubmission of the environmental application.

Abacus also owns a 100% interest in the Willow copper-gold property located near Yerington, Nevada, and it controls the contiguous Nev-Lorraine claims subject to a ten-year lease agreement.

For the latest reports and information on Abacus' projects, please refer to the Company's website at www.amemining.com.

Forward-Looking Information

This release includes certain statements that are deemed "forward-looking statements". All statements in this release, other than statements of historical facts, that address events or developments that Abacus expects to occur, are forward-looking statements. Forward-looking statements are statements that are not historical facts and are generally, but not always, identified by the words "expects", "plans", "anticipates", "believes", "intends", "estimates", "projects", "potential" and similar expressions, or that events or conditions "will", "would", "may", "could" or "should" occur. Although the Company believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements are not guarantees of future performance and actual results may differ materially from those in the forward-looking statements. Factors that could cause the actual results to differ materially from those in forward-looking statements include changes to commodity prices, mine and metallurgical recovery, operating and capital costs, foreign exchange rates, ability to obtain required permits on a timely basis, exploitation and exploration successes, continued availability of capital and financing, and general economic, market or business conditions. Investors are cautioned that any such statements are not guarantees of future performance and actual results or developments may differ materially from those projected in the forward-looking statements. Forward-looking statements are based on the beliefs, estimates and opinions of the Company's management on the date the statements are made. Except as required by applicable securities laws, the Company undertakes no obligation to update these forward-looking statements in the event that management's beliefs, estimates or opinions, or other factors, should change.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.