Andina Copper Reports up to 9.43% Cu and 2.2 g/t Au from Rock-Chip Samples at Mantau, Antofagasta, Chile

November 13, 2025  – TheNewswire - Vancouver, British Columbia - Andina Copper Corporation (Andina) (the Company) (CSE:ANDC) (FSE:FIR) (OTCQB:PMMCF) is pleased to report 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 Project Highlights:

• Multiple historical copper workings occur within a 4,500ha 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 (200Mt @ 0.45% Cu) and Antofagasta PLCs Cachorro discovery (300Mt @ 1% Cu, 4g/t Ag). (referFigure 1) 

• Rock chip sampling returned further high-grade gold and copper results including 9.32% Cu, 0.40 g/t Au 9.43% Cu, 0.21 g/t Au and 5.81% Cu, 2.2 g/t Au. Results significantly expand the footprint of anomalous copper-gold mineralization to over 3km and outline new areas for follow-up exploration (refer Figures 2 and 3). 

• Potential identified for IOCG and stratabound Manto style copper and gold mineralization similar to Marimaca Copper Corp’s (TSX-V:MARI) recent nearby Pampa Medina sulphide copper discovery1 (refer Figure 1) 

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% Cu, 5.91g/t Au. Rock chip sampling returned five additional assays > 1% Cu and eight >0.1g/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 & CEO 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 underway 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 2025-26 field season is underway at Piuquenes and exploration is continuing at pace at Cobrasco”.

Click Image To View Full Size

Figure 1: Mantau Cu-Au Project Location

Click Image To View Full Size

Images 1, 2 & 3: 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 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% Cu, 5.91 g/t Au, 69 ppm Mo, and 15% Fe, 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% Cu, including 9.43% Cu (sample 16680, fault zone) and 9.32% 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 summarised below:

• Sample 16680: 9.43% Cu and 0.21 g/t Au 

• Sample 16731: 9.32% Cu and 0.40 g/t Au 

• Sample 16676: 5.81% Cu and 2.20 g/t Au 

• Sample 16690: 1.73% Cu and 0.14 g/t Au 

• Sample 16666: 1.50% Cu 

• Sample 16683: 0.66% Cu 

• Sample 16687: 0.57% Cu 

• Sample 16690: 0.14 g/t Au 

• Sample 16681: 0.13 g/t Au 

• Sample 16691: 0.11 g/t Au 

Click Image To View Full Size

Figure 2: Geological map, Mantau Cu–Au project.

Click Image To View Full Size

Figure 3: Gridded copper (LHS) and gold (RHS) geochemistry from historical and Andina Copper surface samples.

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 multi-element 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 datasets will provide three-dimensional insights into the subsurface and guide drill-target definition.

Interested parties can subscribe to our mailing list and follow our social media channels in the links below:  

Mailing List | Andina Copper LinkedIn | Andina Copper X | Andina Copper Instagram  

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).

QA/QC

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 30g charge Fire Assay, with an Atomic Adsorption finish. Multi-element analysis was carried out on a 4-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’ standard procedures.

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

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 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.

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 Pampa_Medina_Drilling_Continues_to_Validate_SedimentaryHosted_Copper_Manto_Model

Copyright (c) 2025 TheNewswire - All rights reserved.