Mr. Enrico Gay reports

ALGO GRANDE COPPER CONFIRMS 68.43 METRES OF COPPER-SILVER-GOLD MINERALIZATION ACROSS TWO ZONES IN HOLE AG-CG-PH2-002, INCLUDING A NEW ZONE OF 38.20 METRES AT 1.0% CUEQ

Algo Grande Copper Corp. has released full assay results from hole AG-CG-PH2-002 at the Cerro Grande skarn discovery, part of the company's Adelita project in Sonora, Mexico. AG-CG-PH2-002 was designed to test the vertical extension and along-strike continuity of the Cerro Grande skarn system, and full assay results confirm that this objective has been achieved: high-grade copper-silver-gold mineralization is now demonstrated from 146.70 metres to 282.00 metres downhole, divided into two zones. The hole has returned a second zone of 38.20 metres grading 1.0 per cent CuEq (copper equivalent) from 243.80 metres, approximately 67 metres below the base of the 30.23-metre zone grading 1.5 per cent CuEq previously reported from 146.70 metres, confirming a multihorizon skarn system at Cerro Grande.

The two zones together total 68.43 metres of combined mineralized interval, averaging 1.2 per cent CuEq at 80-per-cent assumed metallurgical recovery. Downhole survey data confirm a gradual, systematic drift in azimuth over the interval between the two zones, which the company considers a contributing factor to the lower grades returned between them (see below). Sampling of the hole was discontinued at 364.00 metres, where the hole passed into fresh, unmineralized granodiorite; the hole was previously reported to have reached a final depth of 661.80 metres (see news release dated Sept. 11, 2026).

Joao Rocha, EurGeol, vice-president of exploration of Algo Grande Copper, commented: "AG-CG-PH2-002 was designed to test the vertical extent and continuity of the Cerro Grande skarn system, and it has delivered exactly that: confirmed high-grade mineralization from 146.70 metres to 282 metres downhole, with a second, discrete high-grade horizon 67 metres below the base of the zone we reported from the first assays. This confirms that Cerro Grande is not a single lens but a multihorizon skarn system with real vertical continuity. With 68.43 metres of combined high-grade mineralization now confirmed across two zones and the system still open along strike, updip and at depth, we believe we are only beginning to define the scale of this discovery."

Vertical extension and continuity confirmed: a second, deeper mineralized zone in AG-CG-PH2-002

AG-CG-PH2-002 was designed to test the vertical extension and along-strike continuity of the Cerro Grande skarn system beyond the footprint established by historic and phase I drilling. Full assay results confirm that this objective has been achieved: High-grade copper-silver-gold mineralization is now present in two discrete zones, from 146.70 metres to 282.00 metres downhole.

Full assay results for AG-CG-PH2-002, including the interval below 179 metres for which assays were previously reported as pending, confirm a second, discrete high-grade copper-silver-gold skarn zone from 243.80 to 282.00 metres downhole, approximately 67 metres below the base of the upper zone reported previously (146.70 to 176.93 metres). The lower zone graded 1.0 per cent CuEq over 38.20 metres, including a narrower, higher-grade interval of 1.70 metres grading 4.5 per cent CuEq from 244.30 metres and a higher-grade core of 11.50 metres grading 2.0 per cent CuEq from 268.00 metres. As with the upper zone, the lower zone carries locally anomalous zinc, up to 0.48 per cent zinc within the 11.50-metre high-grade interval, which the company interprets as a further indication of a sphalerite component within the skarn assemblage.

Because AG-CG-PH2-002 was oriented to test continuity along strike of the skarn system rather than directly downdip, the company attributes the lack of continuous intervals between 176.93 and 243.80 metres, at least in part, to a documented deviation of the drill hole trace away from the higher-grade skarn horizon over that interval, rather than to a true break in mineralization. Downhole survey data record a gradual, systematic drift in azimuth over this portion of the hole, from approximately 112.9 degrees near the collar to approximately 115.6 to 117.7 degrees across the survey stations bracketing this interval (162 to 252 metres). Notwithstanding the deviation, mineralization was intersected at several points within this interval, including 0.85 metre grading 2.7 per cent CuEq from 223.20 metres (1.57 per cent Cu, 98 grams per tonne Ag, 0.46 g/t Au and 1.90 per cent Zn) and 2.10 metres grading 0.7 per cent CuEq from 195.00 metres (0.45 per cent Cu, 20 g/t Ag, 0.16 g/t Au and 1.58 per cent Zn), together with 1.10 metres grading 0.2 per cent CuEq from 192.90 metres (0.14 per cent Cu, five g/t Ag, 0.02 g/t Au and 1.08 per cent Zn) and 1.00 metre grading 0.3 per cent CuEq from 202.00 metres (0.16 per cent Cu, 10 g/t Ag, 0.05 g/t Au and 0.46 per cent Zn). The company therefore interprets the interval as reflecting the position of the drill hole trace relative to the higher-grade skarn horizon rather than an absence of mineralization.

AG-CG-PH2-002 has also, for the first time on this section of Cerro Grande, pinpointed the base of the prospective limestone-skarn package, with the hole passing into fresh, unmineralized granodiorite at 364.00 metres downhole. This revises the preliminary interpretation disclosed in the company's news release dated Sept. 11, 2026, which placed the base of the limestone-skarn package at approximately 312 metres on the basis of preliminary core logging then available; completed logging, downhole survey data and the full assay results for the hole now place the contact at 364.00 metres, extending the interpreted thickness of the prospective host package by approximately 52 metres (361.66 metres of core, from 2.34 to 364.00 metres downhole, submitted for analysis). The company considers this a material, positive result, sharpening the geological architecture of the host package and improving targeting for follow-up drilling along strike and downdip across the broader Cerro Grande corridor.

AG-CG-PH2-002 was collared at 738,897 metres east and 2,961,802 metres north (UTM WGS84 zone 12N, located by hand-held GPS (Global Positioning System)) at an elevation of 582 metres, and was drilled at a magnetic azimuth of 112.9 degrees and a dip of minus-80 degrees to a final depth of 661.80 metres.

AG-CG-PH2-001: multiphase intrusive complex and porphyry-style alteration

AG-CG-PH2-001, the first hole of the phase II program at Cerro Grande, logged a multiphase quartz monzonite intrusive complex in at least four discrete pulses cutting the granodiorite host, together with more than 250 metres of pervasive to strong porphyry-style potassic-silicic alteration, which the company interprets as consistent with a long-lived magmatic-hydrothermal system. Assay results confirm a coincident molybdenum geochemical anomaly averaging 32.6 parts per million molybdenum (peak 110 ppm) over 15.58 metres from 387.42 to 403.00 metres downhole.

Quality assurance/quality control

All drill core samples referenced in this news release were prepared and analyzed at ALS Laboratories, an independent, internationally accredited laboratory, located in Hermosillo, Mexico, and Vancouver, Canada. Sample preparation was completed using ALS preparation methods CRU-31 (crushing), SPL-31 (splitting) and PUL-31 (pulverizing), resulting in a nominal pulp with at least 85 per cent passing a 75-micron sieve.

Multielement analyses were completed using the ME-ICP61a method, a four-acid digestion (hydrochloric, nitric, perchloric and hydrofluoric acids) followed by ICP-AES analysis, appropriate for the higher base metal grades encountered in these intervals. Gold was analyzed using the Au-AA23 method, consisting of a fire assay fusion with an atomic absorption spectroscopy (AAS) finish. Samples returning silver results above the upper detection limit of the ME-ICP61a method were reassayed using the Ag-OG62 overlimit method.

ALS Laboratories employs internal quality control procedures, including the routine insertion of certified reference materials, blanks and duplicates at regular intervals. The company implemented an independent quality assurance and quality control program through the systematic insertion of blind certified reference materials and blank samples into the sample stream. Results from QA/QC samples were reviewed on receipt and found to be within acceptable limits.

Qualified person

The scientific and technical information disclosed in this news release has been reviewed and approved by Joao Rocha, EurGeol, vice-president of exploration of Algo Grande Copper, a qualified person as defined by National Instrument 43-101.

Mr. Rocha, the qualified person, has verified the data disclosed in this news release, including the sampling, analytical and test data underlying the results reported herein. Verification included review of drill collar locations, downhole survey data, sampling and chain-of-custody procedures, and analytical results, together with the QA/QC program described above. There were no limitations on the verification process.

Consulting agreement

The company has engaged German Mining Networks GmbH (GMN) for investor relations and shareholder communications services, including investor and shareholder scheduling, communications, and assistance with road shows. GMN is expected to provide the company with the opportunity to broaden its national and international reach by way of introductions to investors in continental Europe. Peter Krah, managing partner of GMN, will be the principal contact responsible for the provision of such services. The engagement is for a term of three months (unless terminated earlier), commencing on or about Sept. 22, 2026, and the company will pay a flat monthly fee of $6,800. GMN is an arm's-length party to the company and has no interest, directly or indirectly, in the company or its securities, nor any right or present intent to acquire such an interest. GMN's principal place of business is Postfach 10 01 26, 98561, Schmalkalden, Germany.

About Algo Grande Copper Corp.

Algo Grande Copper is a mineral exploration company advancing the Adelita project, a district-scale, multisystem copper-silver-gold opportunity positioned in the prolific Arizona-Sonora copper belt. The 5,895-hectare Adelita project is anchored by the high-grade Cerro Grande copper-gold-silver skarn discovery, which exhibits strong geophysical continuity along a defined corridor extending over six kilometres. Reprocessing of legacy geophysical data and field mapping indicate that a potential porphyry system may occur at depth, suggesting a classic skarn-porphyry mineralization model similar to major deposits found throughout northwestern Mexico.

We seek Safe Harbor.