Total Voting Rights

London, September 30, 2025. Orosur Mining Inc. ("Orosur" or the "Company") (TSX/AIM:OMI) announces that further to the announcement dated 25 September 2025, admission will become effective and dealings will commence at 8:00 am on or around 1 October 2025 in the 260,000 Common Shares to be issued in respect of the exercise of options by two consultants of the Company, at an exercise price of C$0.22 and C$0.325 for 140,000 and 120,000 Common Shares respectively, and the 8,675,418 Common Shares to be issued for a total consideration of US$701,894 following an exercise of 8,675,418 warrants during September from the Company's block listing, announced on January 8, 2025.

Total Voting Rights

As previously notified, following Admission of these 260,000 Common Shares relating to the options, and also the 8,675,418 warrants exercised in September, for the purposes of the Disclosure Guidance and Transparency Rules, the Company will have 325,758,894 Common Shares in issue. Shareholders may use this figure as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the issued share capital of the Company.

Following Admission, the Company will have 4,701,668 options outstanding and 22,834,404 warrants outstanding.