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Saturday, September 26, 2026 Admin

OMI.V ·

(TSX/AIM:OMI) announces that further to the announcement dated 25 September 2025,

Corporate Updates

Orosur Mining Inc

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 respective ly, and the 8,675,418 Common

Shares to be issued for a total consideration of US$701,894 foll owing 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.

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

Orosur Mining Inc

Louis Castro, Chairman,

Brad George, CEO

[email protected]

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/James Pope

Tel: +44 (0)20 3657 0050

Flagstaff Communications and Investor Communications

Tim Thompson

Mark Edwards

Fergus Mellon

[email protected]

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 (Withdrawa l) 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.

Defined terms in this Announcement shall have the same meaning as set out in the

announcement released on September 18, 2025 unless otherwise stated.

About Orosur Mining Inc.

Orosur Mining Inc. (TSXV: OMI; AIM: OMI) is a minerals explorer and developer currently operating in

Colombia, Argentina and Nigeria.