Mr. Joseph van den Elsen reports

ANDINA COPPER REPORTS UP TO 9.43% CU AND 2.2 G/T AU FROM ROCK-CHIP SAMPLES AT MANTAU, ANTOFAGASTA, CHILE

Andina Copper Corp. has released key findings and results from its initial geological field evaluation and sampling program at the Mantau copper-gold project in northern Chile's Antofagasta region.

Mantau Cu-Au (copper-gold) project highlights:

• Multiple historical copper workings occur within a 4,500-hectare tenement package located in the low-altitude Coastal Cordillera of Chile with excellent access and nearby infrastructure.
• Highly prospective district hosts multiple significant deposits including Marimaca Copper's MOD deposit (200 Mt (million tonnes) at 0.45 per cent Cu) and Antofagasta PLC's Cachorro discovery (300 Mt at 1 per cent Cu, four grams per tonne Ag).
• Rock chip sampling returned further high-grade gold and copper results including 9.32 per cent Cu, 0.40 g/t Au 9.43 per cent Cu, 0.21 g/t Au and 5.81 per cent Cu, 2.2 g/t Au. Results significantly expand the footprint of anomalous copper-gold mineralization to over three kilometres and outline new areas for follow-up exploration.
• Potential identified for IOCG (iron-oxide-copper-gold) and stratabound Manto-style copper and gold mineralization similar to Marimaca Copper Corp.'s (TSX Venture Exchange: MARI) recent nearby Pampa Medina sulphide copper discovery.

Field evaluation and sampling highlights

Andina Copper has completed an initial geological review, including mapping and reconnaissance rock-chip sampling, to validate historical results and outline new mineralized areas where previous work by Rugby Resources returned rock chip samples of up to 28.6 per cent Cu, 5.91 g/t Au. Rock-chip sampling returned five additional assays greater than 1 per cent Cu and eight greater than 0.1 g/t Au.

A drone-based photogrammetry survey was completed to produce a new high-resolution digital elevation model (DEM) in support of follow-up mapping and geophysics.

An orientation survey successfully refined soil sampling techniques suitable for use across the weathered terrains typical of the area.

Planning for a follow-up exploration program incorporating grid-based soil sampling and geophysical surveys (mag, IP and MT) to define drill targets has commenced.

President and chief executive officer Joseph van den Elsen commented:

"We are very pleased to have validated historical high-grade Cu and Au results and to have significantly expanded the area of interest at our Mantau project. Such high-grade copper and gold assays in rock samples from a poorly explored, undrilled area close to significant recent copper discoveries highlight the projects strong prospectivity. Planning is now under way for a follow-up work program to define drill targets.

"This is an exciting time to be an Andina shareholder as field programs move into full swing across all three of our projects. The 2025 to 2026 field season is underway at Piuquenes and exploration is continuing at pace at Cobrasco."

Mapping and sampling at Mantau

Mantau Cu-Au field evaluation -- key findings

Andina Copper has completed its initial geological review and field evaluation of the Mantau copper-gold project, including mapping and reconnaissance rock-chip sampling to validate historical results and outline new mineralized areas.

The concession hosts five main lithologies trending south-southwest to north-northeast along fault blocks, including Jurassic La Negra formation volcanic units (andesitic to rhyolitic tuffs) intruded by felsic stocks, particularly in the southeast. Mantau lies immediately west of the Atacama fault zone, within a highly prospective IOCG (iron-oxide-copper-gold) corridor that extends from Antucoya in the north to Marimaca in the south.

Mapping identified prominent red hematite alteration zones, stockwork veining and quartz-magnetite breccias, all consistent with IOCG-style mineralization. Outcrop exposure is limited by shallow colluvial cover, but sampling confirmed copper oxides, specular hematite, limonite and narrow quartz-magnetite vein zones associated with fault structures.

Historical work by Rugby Resources returned values up to 28.6 per cent Cu, 5.91 g/t Au, 69 parts per million Mo (molybdenum) and 15 per cent Fe (iron), concentrated in the southeastern portion of the concession. Andina's recent sampling program collected 70 rock samples, confirming the tenor and distribution of mineralization: five samples returned more than 1 per cent Cu, including 9.43 per cent Cu (sample 16680, fault zone) and 9.32 per cent Cu (sample 16731, Cu-oxide in caliche); eight samples exceeded 0.1 g/t Au, with a maximum of 2.2 g/t Au (sample 16676, 50 cm fault zone). Mineralization is primarily localized along the Falla Este fault zone, interpreted as a major fluid conduit and remains open for follow-up exploration.

Significant copper and gold results from the program are summarized below:

• Sample 16680: 9.43 per cent Cu and 0.21 g/t Au;
• Sample 16731: 9.32 per cent Cu and 0.40 g/t Au;
• Sample 16676: 5.81 per cent Cu and 2.20 g/t Au;
• Sample 16690: 1.73 per cent Cu and 0.14 g/t Au;
• Sample 16666: 1.50 per cent Cu;
• Sample 16683: 0.66 per cent Cu;
• Sample 16687: 0.57 per cent Cu;
• Sample 16690: 0.14 g/t Au;
• Sample 16681: 0.13 g/t Au;
• Sample 16691: 0.11 g/t Au.

Summary and next steps

Recent sampling by Andina Copper has confirmed the strength, location and continuity of key copper-gold anomalies previously identified in historical work. The main mineralized zones occur within rhyolitic tuffs in the central and southeastern portions of the Mantau concessions, where copper and gold are hosted along faults, veins and narrow structural zones.

Geochemical results indicate that mineralization extends across several Mesozoic rock units, confirming the presence of suitable host rocks throughout much of the project area. Within the rhyolitic units, mineralization typically occurs as narrow, structurally controlled zones due to their silicified and relatively impermeable nature. Toward the western part of the concession, the La Negra formation andesitic volcanic units, which are more permeable and considered highly prospective, remain largely underexplored, in part due to shallow topography and surface cover.

Andina's recent soil sampling orientation survey has established an effective approach for surface geochemical sampling in these western areas, paving the way to test zones that were previously considered unsuitable for conventional sampling.

The next exploration steps will focus on implementing a systematic, grid-based soil geochemical program across the broader Mantau area to define multielement trends and refine priority targets; conducting ground or drone-based magnetic surveys as the first step in the geophysical work program; and following up with advanced geophysical techniques such as MobileMT (magnetotellurics) and Vector IP/resistivity and Tensor MT, similar to those used successfully by Marimaca at Pampa Medina. These integrated data sets will provide three-dimensional insights into the subsurface and guide drill-target definition.

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 No. 4160).

QA/QC (quality assurance/quality control)

Rock-chip samples were collected by the company's geologists and the individual samples, bagged, sealed, placed into sealed dispatch bags and delivered to ALS Antofagasta for preparation and analysis.

Gold was analyzed by 30-gram charge fire assay, with an atomic adsorption finish. Multielement analysis was carried out on a four-acid digest aliquot by inductively coupled plasma optical emission spectroscopy (ICP-OES) and over-range samples were subsequently determined by appropriate single-element analyses, in accordance with ALS's standard procedures.

QA/QC results were reviewed by the company's technical team and were found to be within acceptable limits.

About Andina Copper Corp.

Andina Copper (formerly Pampa Metals Corp.) is a unique South America-focused copper explorer listed on the Canadian Securities Exchange (CSE: ANDC), Frankfurt (FSE: FIR) and OTC (OTCQB: PMMCF) exchanges with projects in Argentina, Colombia and Chile.

The company holds two significant discoveries along the world's premier copper producing belt, and a compelling undrilled copper-gold target.

We seek Safe Harbor.