200m from 82m at 0.65% Cu within 322m at 0.51% Cu

September 23, 2026 – Vancouver, British Columbia – TheNewswire - Andina Copper Corporation (TSX-V: ANDC | FSE: FIR | OTCQB: PMMCF) is pleased to report outstanding results from significant step-out drilling at its Cobrasco porphyry copper-molybdenum discovery located in Chocó, Colombia.

Drillhole CDH013 was collared on a new pad 350 metres (“m”) to the northwest of Pad 3 (refer previously reported holes CDH006 to CDH011; August 25, 2026 News Release) and intersected strong, near-surface copper mineralization from 74m downhole, considerably expanding the drill-defined mineralized footprint of the Cobrasco system to the northwest.

Drilling to determine the overall extent of the mineralized system remains ongoing, and further assay results pending.

HIGHLIGHTS:

 

• CDH013 intersected: 

322m at 0.51% Cu, 70ppm Mo, 1.6g/t Ag from 74m

including 200m at 0.65% Cu, 84ppm Mo from 82m

and 44m at 0.81% Cu, 110ppm Mo from 204m

 

• CDH013 significantly extends shallow mineralization to the north-west and enlarges the drill-defined copper mineralized footprint at Cobrasco to approximately 1,300m x 550-700m.  

• Highest copper grades are associated with zones of high fracture intensity in microdiorites and magmatic-hydrothermal breccias developed along contacts with rhyolite porphyries. 

• The Cobrasco mineralized system remains open in multiple directions, with assays pending for three additional drillholes that were completed from the current drill pad. A fourth drillhole from the same pad is currently in progress. 

Joseph van den Elsen, Andina Copper President and CEO stated:

"Drillhole CDH013 has intersected further high-grade, near-surface copper mineralization in a significant step-out to the north-west, extending the drill-defined footprint to approximately 1,300m by 550–700m. With assays pending from multiple drill holes and drilling now directed at the western extension of the high-grade mineralization intersected in CDH001, we look forward to additional near-term results which will help to define the full scale of the Cobrasco system.”

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Figure 1: Cobrasco district copper-in-soil geochemistry, showing outlines of anomalies exceeding 200ppm Cu, the Cobrasco Northern and Southern Blocks, and the Rio Tinto Comita Project block for reference.

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Figure 2: Cross section A-A´, looking east, showing CDH012, CDH013 and CDH014 from the northern platform (Pad 15) with downhole Cu assays, and adjacent drillholes from Pads 1, 3 and 4.

 

Geology and Mineralization

Drillhole CDH013

Hole CDH013 (azimuth 45°; dip −50°; final depth 554.40m) was collared on a new northern platform (Pad 15), located approximately 350m northwest of Pad 3. It was drilled northeast to test the northwestern extension of the Cobrasco mineralized system along a section oriented approximately perpendicular to the main interpreted mineralized trend.

CDH013 intersected a variably oxidized, supergene-leached profile extending to approximately 82m downhole and containing local remnants of hypogene sulfides. No significant supergene chalcocite enrichment was observed. Continuous hypogene copper sulfide mineralization commences at approximately 74m downhole and becomes stronger below approximately 82m, although minor oxidation persists locally to approximately 92–94m downhole. The principal mineralized zone extends to approximately 396m downhole and is hosted by microdiorites intruded by at least two generations of quartz-eye rhyolite porphyry. Magmatic-hydrothermal breccias developed along contacts between the rhyolite porphyries and the microdiorites. Copper mineralization occurs principally as chalcopyrite in disseminations, hairline veinlets and fracture fillings and is locally accompanied by molybdenite. Bornite is also locally present. Moderate chlorite–sericite alteration, in which chlorite is the dominant mineral, overprints earlier moderate to intense potassic alteration represented principally by secondary biotite, with magnetite locally present. Sericite–illite alteration also occurs as mineralized breccia cement and as alteration fronts ranging from tens of centimetres to several metres in width. Zones of high fracture intensity within the microdiorites locally host the highest copper grades intersected in CDH013. A highly fractured zone between approximately 170m and 282m downhole contains abundant chalcopyrite in veins, veinlets and fracture fillings associated with brittle deformation. This zone includes a higher-grade interval of 44m @ 0.81% Cu and 110ppm Mo from 204m, with an individual 2m sample returning 2.14% Cu from 226m. A separate individual 2m sample returned 2.20% Cu from 274m.

Below approximately 300m, copper mineralization generally decreases in intensity and becomes more sporadic but continues principally within quartz-eye rhyolite porphyries to the end of the hole. Microdiorites occur in restricted intervals and locally host higher copper grades. The overall decrease in copper mineralization is likely associated with a reduction in the intensity and continuity of sericitic alteration, which becomes increasingly restricted to halos with depth. Bornite occurs locally as fine disseminations and thin veinlets, commonly replacing chalcopyrite. A 6m interval returning 0.63% Cu from 376m is associated with disseminated bornite within a sericite alteration halo. Late anhydrite–chalcopyrite and polymetallic sphalerite–galena–chalcopyrite veinlets, together with gypsum, overprint the earlier vein generations. In broad terms, the quartz-eye rhyolite porphyries intrude the microdiorites, with emplacement of the rhyolite porphyries likely generating magmatic-hydrothermal breccias that subsequently became mineralized. Microdiorite fragments enclosed within the rhyolite porphyries in the lower portion of CDH013 support this interpreted intrusive sequence. The interpretation is also consistent with U–Pb zircon ages obtained from similar quartz diorite and rhyodacite porphyries intersected in drillholes farther south, including an age of 57 Ma for quartz diorite from CDH002 and ages of 41 to 43 Ma for rhyodacite porphyries from CDH001, CDH002 and CDH003. The occurrence of sphalerite- and galena-bearing veinlets, together with a coincident zinc-in-soil anomaly to the north, suggests metal zonation towards a potential northern periphery of the system. Ongoing drilling, geological mapping and surface geochemistry will continue to constrain the extent of the mineralized system.

Drillhole CDH012

Hole CDH012 (azimuth 225°; dip −60°; final depth 604.60m) was drilled southwest from Pad 15, in the opposite direction to CDH013, along the same northeast–southwest section.

CDH012 intersected a partially oxidized, mixed oxide–sulfide zone containing iron oxides and remnant pyrite and magnetite to approximately 52m downhole. Within this zone, a dark daci-andesitic to microdioritic porphyry occurs between approximately 7.4m and 9m, below which quartz-eye rhyolite porphyry predominates. Local narrow magmatic-hydrothermal breccia dikes are interpreted to be associated with emplacement of the rhyolite porphyries.

Below 52m, quartz-eye rhyolite porphyry is affected by weak sericitic alteration, principally developed as D-type veins containing pyrite and trace chalcopyrite. Between approximately 167m and 237m downhole, CDH012 intersected an essentially unmineralized heterolithic breccia of probable phreatomagmatic affinity, containing rhyolite porphyry fragments within a quartz-crystal-bearing matrix.

Below 237m, quartz-eye rhyolite porphyry is affected by weak sericitic alteration and contains only sparse pyrite–chalcopyrite–bornite veins. Silica–sericite alteration halos with associated sulfide mineralization begin to increase from approximately 300m and become more abundant below approximately 315–317m, coinciding with an increase in copper grades. This altered zone hosts the interval of 12m @ 0.41% Cu and 38ppm Mo from 350m. Below approximately 366m, silica–sericite alteration decreases considerably, accompanied by a corresponding decrease in copper grades within the assayed portion of the hole.

The generally lower copper grades intersected in CDH012 are interpreted to reflect the comparatively weak and discontinuous development of sericitic alteration, which elsewhere at Cobrasco is closely associated with much of the higher-grade copper mineralization. The overall grade profile is also influenced by the essentially unmineralized phreatomagmatic breccia intersected between approximately 167m and 237m downhole.

 

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Figure 3: Cobrasco Project plan view showing copper-in-soil geochemistry, drillhole traces and downhole Cu assays. CDH012 and CDH013 intercepts are labelled, and CDH014 is shown with assay results pending. The mineralized system remains open in multiple directions.

  

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Figure 4: Representative core photographs from CDH013, with depths and corresponding 2m assay results as labelled.

(A) Microdiorite porphyry affected by moderate chlorite–sericite alteration overprinting earlier biotite-dominant potassic alteration. Chalcopyrite occurs as patchy disseminations and hairline fracture fillings. Magnetite and molybdenite are locally present.

(B) Microdiorite porphyry affected by moderate chlorite–sericite alteration, with remnants of earlier potassic alteration, anhydrite–chalcopyrite–pyrite veinlets and disseminated chalcopyrite.

(C) Fractured quartz-eye rhyolite porphyry affected by moderate to intense sericite alteration, containing disseminated chalcopyrite and pyrite and sulfide-filled hairline fractures, cut by late-stage anhydrite veins.

(D) Crowded quartz-eye rhyolite porphyry affected by moderate sericite alteration. Fine bornite occurs as disseminations and thin veinlets, commonly replacing chalcopyrite, and is cut by late-stage anhydrite veinlets.

  

The Company’s Corporate Presentation is available at: Andina Copper Corporate Presentation

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ON BEHALF OF THE BOARD

 

Joseph van den Elsen

President & Chief Executive Officer

joseph@andinacopper.com

 

Jordan Webster

VP – Technical Communications

jordan@andinacopper.com

 

QUALIFIED PERSON

Gustavo Zulliger, 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 reviewed and approved the technical information contained in this news release. Gustavo Zulliger is a Certified Professional Geologist with the American Institute of Professional Geologists (CPG #11165).

 

QAQC

 

CDH012 was collared with a PQ-size drill string and reduced to HQ at 83.3m and to HQ3 at 302.5m downhole, continuing to a final depth of 604.60m. CDH013 was collared with a PQ-size drill string and reduced to HQ at 62.0m and to HQ3 at 83.3m downhole, continuing to a final depth of 554.40m. In both cases, the drill core was extracted from the core barrel by the drill contractor under the supervision of Andina Copper personnel and placed in core boxes with appropriate depth markers (core blocks) and padding for additional protection during transport. Full core boxes were then strapped closed before being transported by helicopter and pickup truck to the Cobrasco core cutting facility in Quibdó. The drill core was cleaned where required, marked and photographed, prior to undergoing geotechnical and preliminary geological logging. All core segments were cut by diamond saw by Andina Copper technicians, other than the soft upper oxidized, near-surface intervals that could be cut and sampled using hand tools. All sampling was conducted in nominal 2m intervals with cut-lines marked by the supervising geologists to ensure representative sampling. Samples were placed in plastic bags with non-repeatable sample tags and bagged in woven polypropylene sacks ready for transport.

The core trays containing the remaining half-core are stored at the Andina Copper facility in Quibdó for additional technical measurements, including TerraSpec spectral analysis, magnetic susceptibility and rock-density measurements, and for follow-up detailed geological logging. From Quibdó, core samples were sent to the ALS sample-preparation facility in Medellín. Prepared sample pulps were then forwarded to the ALS analytical laboratory in Lima, Peru. ALS is independent of the Company. Samples were analyzed for gold using method Au-AA23, for multiple elements using method ME-MS61, and for overlimit values using method ME-OG62, including Cu-OG62 for copper. Coarse and fine rejects are routinely returned by ALS Medellín for storage at the Andina Copper storage facility.

 

The Company’s QA/QC program includes the systematic insertion of certified reference materials, coarse and fine blanks, coarse-reject duplicates and pulp duplicates into the sample stream. Each standard 80-sample submission comprises approximately 70 primary samples and 10 control samples, representing a control-sample insertion rate of approximately 12.5%. Control-sample results are reviewed on a batch-by-batch basis to monitor analytical accuracy, potential contamination and precision.

 

Table 1: Cobrasco Project – Significant Drill Intercepts

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Note 1: CDH013 intervals were calculated using a nominal 0.2% Cu cutoff and a maximum internal dilution of 20m, consistent with the criteria applied to CDH004 and CDH010. The calculations are based on final assay certificates covering the complete hole. The reported CDH012 interval was calculated using the same criteria from assay results received to 398m downhole. Intervals for CDH001 to CDH011 are reproduced as previously reported and retain the reporting criteria described in the corresponding news releases. The previously reported 400m interval in CDH011 includes a 26m internal zone below the 0.2% Cu cutoff between 276m and 302m downhole.

 

Note 2: Reported interval widths are downhole lengths and may not represent the true widths of mineralization.

 

Table 2: Cobrasco Project – Drill Collar Parameters (WGS84, UTM Zone 18N)

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ABOUT ANDINA COPPER  

Andina Copper Corporation is a unique South America-focused copper explorer listed on the TSX Venture Exchange (TSX-V: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 no guarantee of future performance, and actual results may differ materially from those in forward-looking statements.

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