Mr. Tim Heenan reports

DRILLING UNDERWAY AT MIRASOL'S SOBEK COPPER-GOLD PROJECT IN THE VICUNA DISTRICT, CHILE

Drilling is in progress at Mirasol Resources Ltd.'s 100-per-cent-owned Sobek copper-gold-silver project in the Vicuna district of Chile. The 46 South target lies at the southern end of a three-kilometre north-south-trending corridor hosting alteration and mineralization at Sobek Central that runs parallel to Filo del Sol, which is only approximately seven kilometres to the east.

Results from the ground-based Deep Vectoring IP (induced polarization) and MT (magnetotelluric) geophysical survey launched late last year (news release dated Dec. 1, 2025) have defined a shallow coincident IP anomaly with strong MT resistivity and chargeability responses that starts at approximately 200 metres below surface and continues down over 500 metres depth. These responses are interpreted as high-sulphidation epithermal (HSE) or a lithocap root above a strong magnetic anomaly potentially related to an intrusive/porphyry at depth.

"The recently completed Deep Vectoring IP and MT results, integrated with the previous results from the IP ground geophysics and soil sampling survey, combined with the underlying airborne magnetic and MT anomalies, coupled with the hydrothermal and tourmaline breccias encountered on surface, reinforce the potential for 46 South to represent a significant mineralized system," stated Tim Heenan, Mirasol's president and chief executive officer. "The 46 South target already stood out as the most technically compelling target we have defined at our Sobek project. The results from the latest geophysical survey have strengthened the shallow HSE portion of the target, which starts at just 200 metres below surface, and will be the primary focus of this maiden drill hole."

The current drilling strategy prioritizes the IP 10-to-20-millivolt-per-volt range chargeability corridor adjacent to the resistive core, aiming to test the coincident resistive-chargeable architecture and its relationship to the mapped HSE system, while minimizing reliance on peak chargeability alone as a vector to mineralization. The planned drill hole has a projected depth of approximately 1,000 metres and is optimized to test structural intersections, with a strong focus on intersecting the northwest-west-northwest set of structures, while at the same time testing the resistive core and sulphide halo at depth, adjacent to the strong magnetic anomaly within the deeper target zone.

Advancing toward drilling the 46 South target

The Sobek project is located in Chile within the Vicuna district, which hosts both the Filo del Sol deposit and the Lunahuasi discovery across the border in Argentina. The 46 South target lies at the southern end of a three-kilometre, north-south-trending corridor hosting alteration and mineralization that runs parallel to Filo del Sol, which is only approximately seven kilometres to the east.

Located at the south end of Sobek Central, the 46 South target resides on the southern margin of a district-scale magnetic high, where both the airborne MT and magnetics surveys outlined distinct cylindrical anomalies. The grid-based soil survey outlined a coincident prominent, large and coherent copper-gold-molybdenum geochemical anomaly on surface that directly overlays IP-PDP (pole-dipole) resistivity and chargeability responses from IP ground geophysics surveys completed late last season. Structurally controlled tourmaline breccias and hydrothermal breccias were also identified while prospecting and mapping in the target area (news release dated Dec. 1, 2025).

New proven geophysical survey refines 46 South drill target

To further resolve the geometry of these shallow IP/resistivity domains and the deeper MT responses, an innovative and proven Deep Vectoring IP and MT geophysical survey was completed. The survey was designed to refine the characterization of the existing resistive/chargeable domains at shallow levels and the deeper Mag response, providing the vectoring required to refine final drill targets. Comparable approaches at projects such as Atex's Valeriano, directly south of Sobek, in Chile and Aldebaran's Altar in Argentina have demonstrated the effectiveness of this technology in telescoped porphyry-epithermal systems.

Integrating the recently delivered Vector IP (3-D inversion) with ground MT (3-D resistivity) with the previously completed PDP/IP, airborne/ground magnetics (susceptibility modelling) and existing geology/alteration mapping increased the ranking of the shallow HSE target located approximately 200 metres below surface and which extends to over 500 metres depth. This new compilation has revealed a coherent resistive core (dome/pipe) as defined by MT, with the resistivity values commonly greater than 2,000 ohm-metres, interpreted as representing a silica-rich HSE core/silica-rich breccia or silicified structural zone.

The Vector IP chargeability has also outlined a coincident structurally controlled high-chargeability sulphide halo, including a chargeability neck (approximately 10 to 20 millivolts per volt) spatially associated with the northwestern structural corridor, supporting the interpretation of a focused feeder-style architecture beneath the mapped HSE alteration footprint. A higher-chargeability core (greater than 25 to 30 millivolts per volt) is recognized toward the southern part of the system, and this domain is interpreted to represent a more pyrite-rich zone, although it could potentially be a possible structural zone with high sulphide concentration where copper-bearing sulphides could be present.

Geochemical vectoring has defined two domains (structural blocks) separated by the northwestern structural orientation, which are:

• The southern domain (structural block) showing the strongest copper-gold-molybdenum soil footprint with coherent multielement associations consistent with HSE fluid pathways and sulphide zoning, including arsenic-antimony-mercury and molybdenum-rhenium, and bismuth-tellurium-selenium in the broader outer halo;
• The northern domain (structural block) associated with the tourmaline breccias and a distinct geophysical character, interpreted as reflecting magmatic fluid input and/or a deeper-seated intrusive centre.

High-profile Vicuna copper-gold-silver district

Mirasol staked the Sobek project in 2016 based on prospective local geology and attractive structural architecture prior to the 2021 discovery of the high-grade feeder zone at the Filo del Sol gold-copper deposit and the 2023 discovery of Lunahuasi. The consolidated Sobek project is located on the same regional north-south-trending structural corridor and just seven kilometres to the west of the Filo del Sol deposit and three kilometres to the southwest of NGEx Minerals' discovery at Lunahuasi.

Sobek is located within a prospective geological environment with a compelling north-northeast-trending mineralized structural corridor crosscut by a north-northwest-trending deep-seated Trans-Cordilleran lineament. This is a common structural configuration hosting numerous Andean metal deposits in both Chile and Argentina.

About Mirasol Resources Ltd.

Mirasol is a strategically positioned exploration company with over 20 years of operating, permitting and community relations experience in the mineral-rich regions of Chile and Argentina. Mirasol is currently self-financing exploration at the flagship Sobek copper-gold project, located in the Vicuna copper-gold-silver district of northeastern Chile, while continuing to advance a strong pipeline of highly prospective early- and mid-stage projects.

Qualified person statement

Mirasol's disclosure of technical and scientific information in this press release has been reviewed and approved by Tim Heenan (MAIG), president of the company, who serves as a qualified person under the definition of National Instrument 43-101.

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