Mongoose Announces Updated Corporate Presentation Related to Strategic Refocus and Letter to Shareholders from Chairman

Executive Summary

• Mongoose Mining Ltd. released a detailed presentation outlining the technical and strategic rationale for its newly announced focus on evaluating natural (geologic) hydrogen within its Nova Scotia land package.
• The presentation summarizes decades‑old IOCG geological, geophysical and structural data re‑interpreted through an emerging scientific framework that links those attributes to potential hydrogen systems.
• A letter from Chairman W. Matthew Alls accompanies the release, providing governance context and reaffirming confidence in the company’s existing asset fundamentals while noting that no commercial hydrogen presence has been confirmed.

Key Details

• The presentation is publicly available on Mongoose Mining’s website (www.mongoosemining.com).
• Historical datasets reviewed include drill core logs, structural interpretations, airborne magnetic surveys, gravity data and alteration models.
• Re‑assessment indicates material similarities between the Company’s existing data and geological settings associated with confirmed natural hydrogen systems elsewhere.
• The Board considered industry activity in Nova Scotia by third‑party groups exploring natural hydrogen but does not rely on that activity for its own strategy.
• No confirmation of hydrogen presence or commercial viability has been made; the observations are based solely on historical subsurface data.
• Chairman Matthew Allas emphasizes that the strategic shift is grounded in disciplined technical assessment and aligns with evolving scientific understanding and market conditions.
• The release was reviewed and approved by Terry Coughlan, P.Geo., CEO and Qualified Person under NI 43‑101.

Notable Quotes

“The presentation is intended to provide shareholders with transparency into the technical work that informed the Board's decision… It reflects a reassessment of existing data through an evolving scientific framework, rather than a departure from the geological fundamentals that have long underpinned the Company's assets.” – W. Matthew Allas, Chairman

Materiality Assessment: Non‑Material – Neutral (the release provides strategic context without disclosed financial impact or definitive resource confirmation).