Orosur Mining Inc

Total Voting Rights

London, December 31st, 2025, Orosur Mining Inc. ("Orosur" or "the Company") (AIM/TSXV: OMI), a minerals explorer and developer with projects in Colombia and Argentina, advises that, following the Admission of 666,664 common shares of no par value ("Common Shares") on 16 December 2025 pursuant to the exercise of options by consultants of the Company, as announced on 15 December 2025, the Company has 392,689,176 Common Shares in issue. There were no warrants exercised and therefore no Common Shares issued during December from the Company's block listing.

For the purposes of the Disclosure Guidance and Transparency Rules, the Company has 392,689,176 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 in their interest in, the share capital of the Company under the FCA's Disclosure and Transparency Rules.

For further information, visit www.orosur.ca, follow on X @orosurm or please contact:

Orosur Mining Inc

Louis Castro, Chairman

Brad George, CEO

info@orosur.ca

Tel: +1 (778) 373-0100

SP Angel Corporate Finance LLP - Nomad & Joint Broker

Jeff Keating / Jen Clarke / Devik Mehta

Tel: +44 (0) 20 3470 0470

Turner Pope Investments (TPI) Ltd - Joint Broker

Andy Thacker/Guy McDougall

Tel: +44 (0)20 3657 0050

Flagstaff Communications and Investor Communications

Tim Thompson

Mark Edwards

Fergus Mellon

orosur@flagstaffcomms.com

Tel: +44 (0)207 129 1474

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014 ('MAR') which has been incorporated into UK law by the European Union (Withdrawal) Act 2018. Upon the publication of this announcement via Regulatory Information Service ('RIS'), this inside information is now considered to be in the public domain.

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