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MSA.TO ·

Mineros S.A. Commences Phase Two of Share Repurchases Through the Colombian Stock Exchange Transactional Mechanism

Mineros S.A. Commences Phase Two of Share Repurchases Through the Colombian Stock

Exchange Transactional Mechanism

Medellín, Colombia – May 28, 2026 – Mineros S.A. (TSX: MSA, OTCQX: MNSAF, BVC: MINEROS)

(“Mineros” or the “Company”), a leading gold producer in Latin America, announces that it will commence

phase two of repurchases of its common shares through the “ transactional mechanism ” (mecanismo

transaccional) of the Colombian Stock Exchange (Bolsa de Valores de Colombia) starting on Thursday ,

May 28, 2026, pursuant to its previously announced Share Repurchase Program.

The Share Repurchase Program was approved by the General Shareholders’ Assembly at its ordinary

meeting held on March 27, 2026, and further details were announced in the Company’s press releases

dated May 8, 2026, available on the Company’s website at www.mineros.com.co and on SEDAR+ at

www.sedarplus.ca. Repurchases may be carried out until March 27, 2029, the expiry date of the three-year

period or until the completion of the US$80 million approved by the General Shareholders’ Assembly.

Repurchases will be made on common shares of Mineros listed on the Colombian Stock Exchange, in

compliance with the limitations applicable to share repurchases through the transactional mechanism set

out in the Regulations of the Colombian Stock Exchange. The aggregate value of transactions executed on

any single trading day shall not exceed 25% of the average daily trading volume on the Colombian Stock

Exchange over the preceding ninety (90) trading days. As US$13.3 million has been spent under the first

phase of the Share Repurchase Program completed on May 26, 2026, there is a remaining US$66.7 million

worth of share repurchases to be made before completion of the program.

This share repurchase through the transactional mechanism of the Colombian Stock Exchange will not be

conducted through the facilities of the Toronto Stock Exchange. Mineros has determined that share

repurchases under the transactional mechanism are not subject to regulation as an “issuer bid” under

applicable Canadian securities laws.

For Further Information, Please Contact:

Ann Wilkinson

Vice President, Investor Relations

+1 (647) 496-3011

[email protected]

Juan Camilo Obando

Director, Investor Relations

+57 (604) 266-5757

[email protected]

ABOUT MINEROS S.A.

Mineros is a leading Latin American gold mining company headquartered in Medellín, Colombia. The

Company operates a diversified portfolio of assets in Colombia and Nicaragua and maintains a pipeline of

development and exploration projects across the region, including the La Pepa Project in Chile and an

exploration project in the Tolima department, near Cajamarca, Colombia.

With more than 50 years of operating history, Mineros maintains a longstanding focus on safety,

sustainability, and disciplined capital allocation. Its common shares are listed on the Toronto Stock

Exchange (MSA) and the Colombian Stock Exchange (MINEROS) and trade on the OTCQX® Best Market

under the symbol MNSAF.

FORWARD-LOOKING STATEMENTS

This news release contains “forward -looking information” within the meaning of applicable Canadian

securities laws. Forward-looking information includes statements that use forward-looking terminology such

as “may”, “could”, “would”, “will”, “should”, “intend”, “target”, “plan”, “expect”, “budget”, “estimate”, “forecast”,

“schedule”, “anticipate”, “believe”, “continue”, “potential”, “view” or the negative or grammatical variation

thereof or other variations thereof or comparable terminology. Such forward -looking information includes,

without limitation, the timing and amount of share repurchases under the transactional mechanism; and

any other statement that may predict, forecast, indicate or imply future plans, intentions, levels of activity,

results, performance or achievements.

Forward-looking information is based upon estimates and assumptions of management in light of

management’s experience and perception of trends, current conditions and expected developments, as

well as other factors that management believes to be relevant and reasonable in the circumstances, as of

the date of this news release. While the Company considers these assumptions to be reasonable, the

assumptions are inherently subject to significant business, social, economic, political, regulatory,

competitive an d other risks and uncertainties, contingencies and other factors that could cause actual

actions, events, conditions, results, performance or achievements to be materially different from those

projected in the forward-looking information. Many assumptions are based on factors and events that are

not within the control of the Company and there is no assurance they will prove to be correct.

For further information of these and other risk factors, please see the “Risk Factors” section of the

Company’s most recent Annual Information Form, available on SEDAR+ at www.sedarplus.ca.

The Company cautions that the foregoing lists of important assumptions and factors are not exhaustive.

Other events or circumstances could cause actual results to differ materially from those estimated or

projected and expressed in, or implied by, the forward-looking information contained herein. There can be

no assurance that forward-looking information will prove to be accurate, as actual results and future events

could differ materially from those anticipated in such information. Accordingly, readers should not place

undue reliance on forward-looking information.

Forward-looking information contained herein is made as of the date of this news release and the Company

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

information, future events or results or otherwise, except as and to the extent required by applicable

securities laws.