Mr. Enrico Gay reports

ALGO GRANDE PROVIDES PHASE II DRILL UPDATE; COMMENCES HOLE 3 WITH SECOND DRILL RIG AT CERRO GRANDE

Algo Grande Copper Corp. has commenced drilling on Hole AG_CG_PH2_003 (Hole 3) at the Cerro Grande skarn target, at the company's 100-per-cent-owned Adelita project in Sonora, Mexico, using the second, track-mounted drill rig mobilized to the project as previously announced. Hole 3 is designed to improve confidence on two historical skarn horizons, test the along-strike extension of three additional horizons discovered during the company's phase I drill program and explore for further horizons within previously unexplored limestone beyond the currently known section. Hole AG_CG_PH2_002 (Hole 2) continues to advance and has reached approximately 300 metres toward its planned 700-metre total depth. A successful result from Hole 3 would support the company's interpretation of a laterally and vertically extensive skarn system at Cerro Grande with further expansion potential.

• At Cerro Grande: Hole AG_CG_PH2_003 (Hole 3) has commenced drilling at the Cerro Grande skarn target, collared approximately 100 metres along strike from the phase I discovery hole, AG_GC_002, and planned to a total depth of 450 metres.
• Hole 3 objectives: Confirm and expand the five known skarn horizons at Cerro Grande while testing for additional mineralized horizons in previously untested limestone.
• Hole 2 (AG_CG_PH2_002) continues to advance: Now at approximately 300 metres of its planned 700-metre depth, with core from the copper-bearing intervals disclosed in the company's July 28, 2026, release being cut and shipped to ALS Laboratories in Hermosillo. A further update will follow.

Hole 3 objective: chasing new skarn zones discovered in phase I

The phase I drill program at Cerro Grande comprised approximately 2,000 metres across four holes, completed in February, 2026. On Feb. 5, 2026, the company reported drill hole AG_GC_002 had intersected three additional skarn horizons not previously known, alongside two shallower, previously known horizons, confirming a stacked, five-horizon skarn system at Cerro Grande. The three new horizons were encountered at a downhole depth of 339 metres along the hole's angled trajectory (dip negative 50 degrees), in ground not previously tested at Cerro Grande. Skarn mineralization at Cerro Grande also outcrops at surface elsewhere along the corridor, so this figure reflects AG_GC_002's specific angled path, not the true depth at which skarn mineralization begins in the broader system. Across all five horizons, AG_GC_002 intersected a combined 41.59 metres of mineralized skarn across five separate, non-contiguous intervals (individual interval grades are shown in Table 1).

Hole 3 in Phase II targets these five horizons, which remain open for expansion. The two historical horizons require further drilling to improve geological confidence, the three newly discovered horizons were identified in a single drill hole and remain untested along strike, and the limestone package that hosts all five horizons extends beyond the currently drill-tested section, raising the possibility of additional, as yet undiscovered horizons.

Hole AG_CG_PH2_003 details

Hole 3 is collared at 738,994 metres east/2,961,792 metres north (WGS84, UTM zone 12N), elevation 490 metres, with an azimuth of 250 degrees and a dip of negative 55 degrees, and is planned to a total depth of 450 metres.

Drilling is in progress. Core will be logged, photographed and sampled using the company's standard procedures, with samples submitted to ALS Laboratories for analysis.

Hole AG_CG_PH2_002 update

Hole 2 continues to advance successfully and has now reached approximately 300 metres toward its planned total depth of 700 metres. Core from the mineralized intervals in Hole 2 (146.70 to 176.93 metres) disclosed in the company's news release dated July 28, 2026, is being cut and prepared for shipment to ALS Laboratories' facility in Hermosillo, Sonora, with shipment expected in the coming week. Assay results for Hole 2 will be reported once received, reviewed and verified. The company will provide a further update on Hole 2's progress in due course.

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.

About Algo Grande Copper Corp.

Algo Grande Copper is a growth-focused 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 Cu-Ag-Au (copper-silver-gold) skarn discovery, which exhibits strong continuity along a defined corridor extending over six kilometres. Reprocessing of legacy geophysical data and field mapping indicate the presence of a potential porphyry system at depth, suggesting a classic skarn-porphyry mineralization model similar to major deposits found throughout northwestern Mexico.

We seek Safe Harbor.

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