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Orosur Mining Inc. – Termination of Anillo Option Agreement

Mergers & Acquisitions Property Options & Staking

Orosur Mining Inc. – Termination of Anillo Option Agreement

MONTEVIDEO, Uruguay, May 25, 2018. Orosur Mining Inc. (“Orosur” or “the Company” ) (TSX/AIM: OMI), a

South American-focused gold producer, developer and explorer announces its decision to terminate the option

agreement on its Anillo gold exploration project with Nacional del Cobre de Chile (“Codelco”), Chile’s national

mining company, located close to Antofagasta, in Region II, Chile and focus its resources on its core properties

in Colombia and Uruguay.

The Anillo project was originally optioned from Codelco in 2010, giving Orosur the right to acquire a 65%

interest in the project by spending US$4,000,000 over 4 years and completing a bankable feasibility study.

On June 6, 2015, the Company closed a further option agreement with Asset Chile Exploración Minera Fondo

de Inversión Privado (“AC”), whereby AC subscribed for an initial amount of Anillo SPA common shares equal

to 16% of the capital of Anillo SPA for gross proceeds of US$850,000. AC had a further option to elect to earn

up to 32.5% and up to 40%, by funding an additional US$1,250,000 and an additional US$1,375,000

respectively, which did not materialise.

Rather, following completion of the first phase of capital, Orosur and AC agreed to extend AC’s timing to enter

into phase 2 until December 2017 in exchange for AC paying care and maintenance costs of Anillo as well as

the Chilean office costs and also allowing Orosur to enter into discussions with other parties to potentially fund

the project.

In view of the lack of positive exploration results during phase 1, AC gave notice of their intention not to enter

into phase 2, following which and given the lack of alternative partners and the early stage and high-risk nature

of this project, the Company has decided not to proceed with the option agreement. The termination of the

option agreement is concluded by notifying Codelco and the n otice was given to Codelco on May 24, 2018.

There are no penalties involved with the termination of the Anillo option agreement. Orosur has an asset value

of approximately US$5.5 million recognized in its statements for the Anillo project which will be written down

in the next financial results.

About Orosur Mining Inc.

Orosur Mining Inc. (TSX: OMI; AIM: OMI) is a fully integrated gold producer, developer and explorer focused

on identifying and advancing gold projects in South America. The Company operates the only producing gold

mine in Uruguay (San Gregorio) and has assembled an exploration portfolio of high quality assets in Uruguay,

Chile and Colombia.

For further information, please contact:

Orosur Mining Inc

Ignacio Salazar, Chief Executive Officer

Ryan Cohen, VP Corporate Development

[email protected]

Tel: +1 (778) 373-0100

Cantor Fitzgerald Europe – Nomad & Joint Broker

David Porter/Keith Dowsing

Tel: +44 (0) 20 7894 7000

Numis Securities Limited – Joint Broker

John Prior / James Black / Paul Gillam

Tel: +44 (0) 20 7260 1000

2

The information contained within this announcement is deemed by the Company to constitute inside

information as stipulated under the Market Abuse Regulation ("MAR"). Upon the publication of this

announcement via Regulatory Information Service, this inside information is now considered to be in the public

domain. If you have any queries on this, then please contact Ryan Cohen, VP Corporate Development of the

Company (responsible for arranging release of this announcement on behalf of the Company ) on: +1 (778)

373-0100.

Forward Looking Statements

All statements, other than statements of historical fact, contained or incorporated by reference in this news

release, including any information as to the future financial or operating performance of the Company,

constitute "forward -looking statements" within the meaning of certain securities laws, including the "safe

harbour" provisions of the Securities Act (Ontario) and the United States Private Securities Litigation Reform

Act of 1995 and are based on expectations estimates and projections as of the date of this news release.

There can be no assurance that such statements will prove to be accurate. Such statements are subject to

significant risks and uncertainties, and actual results and future events could differ materially from those

anticipated in such statements. Forward-looking statements include, without limitation s uccess of exploration

activities; permitting time lines; the failure of plant; equipment or processes to operate as anticipated;

accidents; labour disputes; requirements for additional capital title disputes or claims and limitations on

insurance coverage. 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.