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Orosur Completes Phase one of El Pantano JV, Argentina

Partnerships & JV

Orosur Completes Phase one of El Pantano JV, Argentina

• The Company successfully completes Phase one of its exploration

JV over the El Pantano gold exploration project in Santa Cruz

province, Argentina.

• Company now owns 51% of the Project after having invested

US$1m.

• Company can now move to 100% ownership of the Project by

investing an additional US$2m over two years.

London, February 17 th, 2025 . Orosur Mining Inc. ("Orosur" or the

"Company") (TSXV/AIM:OMI), is pleased to announce successful

completion of the first phase of a two phase exploration joint venture ("JV")

over the El Pantano gold project in Santa Cruz province, Argentina ("Project"

or "El Pantano"). This milestone marks a significant step forwar d in the

Company's strategic development of the Project.

Having invested US$1m over three years, the Company has now earned a

direct 51% interest in the Argentine company, Deseado Dorado S.A.S

("Deseado"), that owns the exploration licences that make up the Project.

The Company can now move to the second phase of the JV, that could see

it move to 100% ownership of Deseado upon investment of an additional

US$2m over two years. Upon such an outcome, the original vendors would

then retain a residual 2% NSR royalty, 1% o f which the Company could

repurchase at its election for US$1m.

El Pantano is an early -stage gold/silver exploration project in Santa

Cruz province, southern Argentina. The Project comprises a number of

contiguous, granted exploration licences totalling some 560km2 in the prolific

Deseado Massif geological province. The Deseado Massif plays host to a

number of world class gold and silver deposits, including Newmont's Cerro

Negro mine and Anglo Gold's Cerro Vanguardia operation.

The Project was in an early -stage, greenfield state, having seen little or no

historical exploration before commencement of the JV in early 2022.

However, Company geological teams felt the Project held enormous

potential on the basis of regional geological data, suggestive of the presence

of a large epithermal system.

Over the last three years, the Company's geological teams have been

methodically undertaking base level geoscience surveys including ground

magnetics, geological mapping and surface geochemistry. These data

support the rift-related low-sulphidation epithermal model, with identification

of a 25km long rift structure with pervasive silicification, quartz veining and

geochemical anomalism over a huge area.

The Company is to soon commence induced polarisation surveys ("IP")

designed to define silicified drill targets.

Orosur CEO Brad George commented:

"We are delighted to have reached this key stage in the Exploration

Agreement. In particular we see the work to date as tremendous testament

to the value of back to basics, grass roots exploration - taking an unwanted,

untouched region, doing the work, and transforming it into a huge and

extraordinarily exciting prospect in a world class province at a time of record

gold prices. Together with our partners we are starting to prepare for Phase

2 of the Project, and we look forward to accelerated exploration activities"

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.

About Orosur Mining Inc.

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

Argentina and Nigeria.

Forward Looking Statements

All statements, other than statements of historical fact, contained in this news release constitute "forward looking

statements" within the meaning of applicable securities laws, including but not limited to the "safe harbour"

provisions of the United Stat es Private Securities Litigation Reform Act of 1995 and are based on expectations

estimates and projections as of the date of this news release.

Forward-looking statements include, without limitation, the continuing focus on the Pepas prospect, the exploration

plans in Colombia and the funding of those plans, and other events or conditions that may occur in the future.

There can be no assurance that such statements will prove to be accurate. Actual results and future events could

differ materially from those anticipated in such forward -looking statements. Such statements are subject to

significant risks and uncertainties including, but not limited to, those described in the Section "Risks Factors" of the

Company's MD&A for the year ended May 31, 2024. The Company's continuance as a going concern is dependent

upon its ability to obtain adequate financing, to reach profitable levels of operations and t o reach a satisfactory

closure of the Creditor´s Agreement in Uruguay. These material uncertainties may cast significant doubt upon the

Company's ability to realize its assets and discharge its liabilities in the normal course of business and accordingly

the appropriateness of the use of accounting principles applicable to a going concern. The Company disclaims any

intention or obligation to update or revise any forward -looking statements whether as a result of new information,

future events and such forward-looking statements, except to the extent required by applicable law.