Alta Copper Corp. reported very positive results from the metallurgical program for the Canariaco Sur copper gold porphyry deposit and provides a project update at its 100% owned Canariaco advanced-stage copper project. Highlights: Positive Metal Recoveries from Metallurgical Program at Canariaco Sur; Optimized Preliminary Economic Assessment ("PEA") advancing as planned with results to be published in early April 2024; Update on Drill Permit Application for up to 47,000 meters of drilling; and Community Relations advancing by way of further ratifying future commitments for the development of sustainable projects in the area.

These results fully support an enlarged Canariaco Project comprising a joint development and blending of the well-defined Canariaco Norte deposit and the Canariaco Sur deposit. Given the proximity of the two deposits, a combined development has the potential to enhance the overall Canariaco Project. Previous economic studies only per obtained to the Canariaco Norte deposit.

Ltd. and Ausenco Engineering Canada Inc. ("Ausenco"). Positive developments incorporating 3D Geological Modelling have identified several high-grade copper zones as well as recent results from metallurgical test program for Canariaco Sur will now be incorporated into the PEA. While this delayed targeted date for publication of the PEA results the benefits of such will be clearly demonstrated.

The PEA will now include the joint development of the well-defined CanARIaco Norte deposit and the canariaco Sur deposit. Given The proximity of Canariaco Sur, located 1.5 kms southwest of Canariaco Norte, combined development of these two deposits is expected to further enhance project economics. All previous studies have excluded the Canariaco Sur deposit shown below.

Drilling to date on Canariaco Sur has been limited to 15 drill holes so further drilling with several high priority drill targets for expansion purposes have been identified. Canariaco Sur Inferred Resource, Contained Metal, Cu, Tonnes, Cu Eq, Cu, Au, Ag, Mo, Cut-Off, (Mt), Note 1, (g/t), (g/t), (B lbs), (M Ozs), (M lbs), (M lbs), (M lbs), (M lbs), ("M lbs), (M lbs"), (M lbs), (M Ozs"), (M lbs), (M ozs), (M lbs), (" M lbs), (M lbs"), ("M lbs), (M Oz's), (M lbs), (m lbs), (M lbs),(M lbs), (M lbs). (M lbs), (M ozs), (M lbs"), (M lbs), (M ozs"), (M lbs), ("M ozs), (M ozs), ("M lbs), (M lbs"), (M lbs), (" M ozs), (M oz's), (M lbs), ("m lbs), (M lbs"), 0.20%, 290.0, 0.35%, 0.15%, 384.5, 0.32%, 0.26%, 0.10, 1.2, 2.22, 1.18, 15.02, 18.91, 0.10%, 433.2, 0.30%, 0.30%, 0.25%, 0.09, 1.2, 1.2, 2, 2.36, 1.26, 16.39, 20.80.

Note 1: The Mineral Resources estimate has an effective date of January 27, 2022. The Qualified Person for the estimate is David Thomas, P.Geo. of DKT Geosolutions Inc. Drill Permit Application.

Alta Copper intends to initially drill approximately 20,000 meters in two separate phases commencing in 2024. The amount of drilling proposed by way of the DIA is deemed appropriate in view of the drilling completed to date of 85,183 meters in 289 holes, which currently represents a significant mineral resource most of which is included in the measured and indicated category. An updated geological model for the Canariaco Norte deposits has been completed with the re-interpretation of district-scale and project-specific geology while identifying significant mineralization potential and numerous high priority drill targets which will provide the foundation for a planned 20,000 meter drilling program.