(CSE:ADNC) (FSE:FIR) (OTCQB:PMMCF)                                For Immediate Release

August 18, 2025 – Vancouver, British Columbia.  

Andina Copper Corporation (Andina) is pleased to announce that as preparations for field mobilization at the flagship Piuquenes and Cobrasco projects advance, the Company has commenced field assessment of the Mantau copper-gold target in the Antofagasta region of northern Chile. Mantau is located in a prolific copper district and adjoins tenements hosting Marimaca Copper’s (TSXV:MARI) recent Pampa Medina Norte sulphide copper discovery1.  

Mantau Cu-Au Project Highlights:

• Multiple historical copper workings occur within a 4,500ha tenement package in the low-altitude Coastal Cordillera of Chile (refer Figure 1), one of the world’s premier mining jurisdictions 
• Potential to host stratabound (Manto) and Iron Oxide Copper Gold (IOCG) style copper and gold mineralization 
• Limited previous surface rock chip sampling around historical workings has returned grades up to 28.6% copper and 5.91g/t gold 
• Close proximity to Marimaca Copper’s (TSX-V:MARI) recent Pampa Medina sulphide copper discovery and the Pias target (refer Figure 1). 
• Other noteworthy projects in the near vicinity include Marimaca Copper’s MOD Deposit2 (1mt contained Cu ~ 20km SW) and Antofagasta PLCs Cachorro discovery (~250Mt @ 1.26% Cu, 4g/t Ag ~20km E)3 
• Excellent access to infrastructure with multiple operating copper mines and development projects nearby.  

Work Program Summary:

• Andina has initiated a comprehensive review of historical work, and currently has an exploration team on site conducting reconnaissance mapping and rock chip sampling of historical occurrences and alteration zones defined in ASTER spectral imagery. 
• A detailed geochemical orientation survey to determine optimized future sampling techniques and assay methodology is also being prepared, in addition to drone-based aerial photogrammetry over the extent of the project concessions.  
• Detailed litho-geochemical sampling of all rock types will also be completed to establish background values and pathfinder geochemistry.  
• Evaluation of cost-effective geophysical techniques applicable to the mineralization styles and geology of Mantau and the surrounding district is underway, including detailed (close-spaced) magnetics survey, conducted either via conventional ground-based or aerial (drone) based platforms. Other techniques such as Induced Polarisation (IP) and Audio-Magnetotelluric (AMT) which have been instrumental in the delineation of deep sulphide mineralization in the adjoining Pias and Pampa Medina targets will also be assessed for a follow-up stage of geophysical data acquisition.  

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Figure 1 – Mantau Project. Note anomalous Au values associated with Cu, and close proximity to Marimaca Copper’s (TSX-V:MARI) recent Pampa Medina sulphide copper discovery and the Pias target

President & CEO Joseph van den Elsen commented:

“As we continue to advance preparations for the 2025/26 field season at Piuquenes and recommencement of drilling at Cobrasco, we are very excited to commence initial assessment of the Mantau Cu-Au Target located in the Tier 1 address of Antofagasta, Chile. Our work will build upon the data from limited historical exploration utilizing the latest technologies to rapidly advance our understanding of the projects’ potential. Mantau is well located amongst numerous copper mines and recent discoveries and is an exciting, highly prospective third leg within the portfolio. This is an exciting time to be a shareholder of Andina Copper as we enter a period of intensive field activities and associated news flow and also pursue a dual listing on the TSX-V and ASX”.

The Company’s Corporate Presentation is available at: https://www.pampametals.com/investor/presentations.html#presentation">Andina Copper Corporate Presentation

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QUALIFIED PERSON

Francisco Montes, a consultant of Andina Copper Corp and a “qualified person” (“QP”) within the definition of that term in National Instrument 43-101, Standards of Disclosure for Mineral Projects, has verified the scientific and technical information that forms the basis for this news release. Francisco Montes is a member of Australian Institute of Geoscientists (MAIG #4160).

ABOUT ANDINA COPPER  

Andina Copper Corporation (formerly Pampa Metals Corporation) is a unique South America- focused copper explorer listed on the Canadian Stock Exchange (CSE:ANDC), Frankfurt (FSE: FIR), and OTC (OTCQB: PMMCF) exchanges..

The Company holds two significant discoveries along the world’s premier copper producing Andean porphyry belt in Argentina and Colombia, and a compelling undrilled copper-gold target in the prolific copper production district of the Coastal Cordillera of Chile.

FORWARD-LOOKING STATEMENT

This news release contains certain statements that may be deemed "forward-looking statements". All statements in this release, other than statements of historical fact, that address events or developments that Andina Copper expects to occur, are forward-looking statements. Forward-looking statements are statements that are not historical facts and are generally, but not always, identified by the words "expects" and similar expressions, or that events or conditions "will" or "may" occur.  These statements are subject to various risks.  Although Andina Copper believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements are not guaranteeing of future performance, and actual results may differ materially from those in forward-looking statements.

Neither the CSE nor the Canadian Investment Regulatory Organization accepts responsibility for the adequacy or accuracy of this release.

1 24 December 2024: Marimaca Makes Pampa Medina Norte Discovery – Intersects 18m at 5.1% CuT within 102m at 1.2% CuT, both within a broad zone of 400m at 0.5% CuT. NR Link

2 Marimaca Copper Corp. 2023 Mineral Resource Estimate (NCL Consulting, L. Oviedo, May 18th, 2023)

3 Antofagasta Annual Report