Mongoose Mining Announces Executive Leadership Realignment

Halifax, Nova Scotia--(Newsfile Corp. - January 15, 2026) - Mongoose Mining Ltd. (CSE: MNG) ("Mongoose" or the "Company") announces that its Board of Directors has approved a realignment of the Company's executive leadership structure to support effective governance, operational execution, and external engagement as the Company advances its exploration activities within the mineral and natural resource markets.

Executive Appointments

Pursuant to the Board's approval:

• W. Matthew Allas, currently Chairman of the Board, has been appointed Executive Chairman of the Company;

• Terence Coughlan, the Company's current Chief Executive Officer has been re-designated as Co-President (Operations); and

• Gerasimos (Gerry) Sklavounos, Jr., currently an independent director of the Company has been appointed Co-President (Corporate & External Affairs);

Rationale for the Leadership Structure

The Board determined that the revised executive structure is appropriate given the Company's current stage of development and evolving requirements, including:

• Target refinement using existing geological, geophysical, and structural data;

• Increased emphasis on disciplined execution of exploration and technical programs;

• Ongoing engagement with securities regulators and the Canadian Securities Exchange;

• Growing interaction with government bodies, industry participants, and strategic counterparties; and

• The need for clear delineation of operational and external responsibilities at the senior executive level.

The Executive Chairman role is intended to provide active strategic leadership and continuity, while the complementary Co-President roles establish focused accountability for operational execution and regulatory, industry, and external affairs.

Governance and Disclosure Considerations

The executive leadership realignment:

• Does not constitute a change of business, change of control, or fundamental transaction;

• Does not affect the Company's issued and outstanding share capital or ownership structure; and

• Is consistent with governance practices commonly adopted by Canadian exploration-stage resource companies.

The Company will make any required regulatory or exchange filings and issue related disclosures in accordance with applicable securities laws and Canadian Securities Exchange policies.