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BVC:MINEROS TSX:MSA OTCQX:MNSAF MINEROS.COM.CO Mineros S.A. Leads Construction of New Public School in Colombia’s Bajo Cauca Region, Advancing Social Investment In Nechí Operations

Mine Development & Operations

BVC:MINEROS TSX:MSA OTCQX:MNSAF MINEROS.COM.CO

Mineros S.A. Leads Construction of New Public School in Colombia’s Bajo Cauca

Region, Advancing Social Investment In Nechí Operations

Key Highlights

• Mineros S.A. is the principal contributor and project manager of a new public

secondary school in El Bagre, Antioquia, within the Nechí Alluvial Property operating

footprint.

• Total project investment of approximately COP $38.7 billion (≈ US$9.1 million),

co-funded with EPM, Grupo Argos, and Grupo Nutresa.

• Financed through Colombia’s Obras por Impuestos (“Works-for-Taxes”)

mechanism, which redirects corporate income tax into community infrastructure in post-

conflict (PDET) municipalities.

• New 11,000 m² campus will serve more than 1,080 students in a region

historically affected by armed conflict and illegal mining.

MEDELLÍN, Colombia — April 24, 2026 — Mineros S.A. (TSX: MSA | OTCQX: MNSAF

| BVC: MINEROS) (“Mineros” or the “Company”) today announced the groundbreaking

of a new public secondary school — Institución Educativa El Bagre — in the

municipality of El Bagre, Antioquia, located within the Company’s Nechí Alluvial

Property operating footprint in the Bajo Cauca region of Colombia.

Management Commentary

“Investing in education in the communities where we operate is fundamental to how we

understand responsible mining,” said Santiago Cardona Múnera, Vice President for

Colombia Operations of Mineros S.A. “The Works-for-Taxes mechanism is one of the

most effective tools available to Colombian corporate taxpayers for closing development

gaps in post-conflict territories. This project — three years in the making — reflects the

power of structured public-private alliances when they are grounded in a long-term

territorial commitment.”

The Institución Educativa El Bagre is one of several community investment initiatives

Mineros is advancing in the Bajo Cauca region in partnership with Proantioquia’s OxI

Platform, the Government of Antioquia, the Municipality of El Bagre, the Agency for

Territorial Renewal (ART), and Colombia’s Ministry of National Education.

BVC:MINEROS TSX:MSA OTCQX:MNSAF 2

The project represents a total investment of approximately COP $38.7 billion

(approximately US$9.1 million at current exchange rates), of which Mineros is the

principal contributor and project manager. EPM, Grupo Argos, and Grupo Nutresa are

participating as strategic co-investors. Upon completion, the new campus will serve

more than 1,080 students. Construction is expected to take approximately 18 months,

during which students will continue classes at alternate facilities to safeguard academic

continuity.

Project Specifications

Built on a 5,667 m² site with approximately 11,000 m² of new infrastructure, the school

will feature modern classrooms, a community-access library, a multi-sport court, an arts

studio, an audiovisual laboratory, and dedicated physics and chemistry laboratories.

The design standard is without precedent for the Bajo Cauca region and aims to deliver

educational conditions comparable to those available in Colombia’s major urban

centres.

Works-for-Taxes: A Tax-Efficient Framework for Community Investment

The project is structured under Colombia’s Obras por Impuestos (“Works-for-Taxes”)

mechanism — a tax instrument that allows qualifying companies to allocate a portion of

their corporate income tax liability to high-impact social infrastructure in PDET

municipalities (Programs for Development with a Territorial Approach, designated under

Colombia’s post-conflict framework). The mechanism converts mandatory tax

expenditure into tangible, measurable community investment within the Company’s

operating jurisdictions, producing a durable social-license dividend at no incremental

after-tax cost.

About Mineros S.A.

Mineros S.A. is a Latin American gold mining company with producing assets in

Colombia (the Nechí Alluvial Property) and Nicaragua (the HEMCO Property), and

development-stage assets including La Colosa (Tolima, Colombia), La Pepa (Atacama,

Chile), and the Porvenir polymetallic project (Nicaragua). The Company is listed on the

Toronto Stock Exchange (TSX: MSA), OTCQX (OTCQX: MNSAF), and the Colombian

Stock Exchange (BVC: MINEROS). For additional information, visit

www.mineros.com.co.

Election of Directors – Electoral Quotient System

BVC:MINEROS TSX:MSA OTCQX:MNSAF 3

The Company has received an exemption from the individual and majority voting

requirements applicable to TSX-listed issuers. Compliance with such requirements

would conflict with Colombian laws and regulations, which require directors to be

elected from a slate of nominees under an electoral quotient system. Additional details

are available in the Company’s most recent Annual Information Form, accessible on the

Company’s website at www.mineros.com.co and on SEDAR+ at www.sedarplus.com.

For Further Information, Please Contact:

Ann Wilkinson

Vice President, Investor Relations

+1 (647) 496-3011

[email protected]

Juan Obando

Director, Investor Relations

+57 (4) 266-5757

[email protected]

Media Relations [email protected]

Forward-Looking Statements

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

applicable Canadian securities legislation. Forward-looking information includes, but is

not limited to, statements regarding the construction timeline, scope, funding structure,

and expected social impact of the Institución Educativa El Bagre project, as well as the

Company’s broader community-investment activities in the Bajo Cauca region. Forward-

looking information is based on assumptions and estimates considered reasonable by

management at the date such information is given; however, actual outcomes may differ

materially. Readers are cautioned not to place undue reliance on forward-looking

information. The Company undertakes no obligation to update or revise forward-looking

information except as required by applicable securities law.