Mr. David Greenway reports

VANGUARD MINING REPORTS RE-ASSAY PROGRAM FOR REDONDA COPPER-MOLYBDENUM PROJECT

Vanguard Mining Corp. plans to undertake additional reassaying of selected drill core using industry-standard multielement analytical methods, including four-acid digestion with ICP-MS (inductively coupled plasma mass spectrometry) and ICP-AES (inductively coupled plasma atomic emission spectroscopy), to further evaluate gold, copper, silver, rare earth and other associated elements.

This work is intended to enhance the company's understanding of the copper equivalent (CuEq) values derived from the recently completed drill program at its 100-per-cent-owned Redonda copper-molybdenum project, located in the Vancouver mining division, approximately 40 kilometres northeast of Campbell River, B.C.

David Greenway, chief executive officer of Vanguard Mining, commented: "With sustained strength in silver, gold and copper prices, the underlying value of mineralized rock is increasing. Advances in laboratory technology and analytical methods, combined with systematic drilling, provide an opportunity to re-evaluate historical data and reassaying material using modern techniques. The planned phase 2 drill program will build on the 2025 results at Redonda, while reassaying and updated geological work are intended to help better define and unlock the project's mineral potential as exploration continues in 2026."

2026 drill program

As previously announced on Jan. 27, the additional reassaying will support the advancement of the planned phase 2 drill and exploration program, which is expected to include the following.

The drill program is fully permitted and is being advanced to build upon the encouraging results from the company's recently completed drill program at the project. The drill program is currently anticipated to include:

• Reconnaissance-scale induced polarization (IP) surveying to better define and vector toward zones of higher-grade copper-molybdenum mineralization;
• Drilling of up to seven diamond drill holes totalling up to approximately 2,800 metres, targeting the southeast portion of the project between and beyond historical TECK drill holes;
• Detailed geological mapping and prospecting will be conducted to the north and west within the project's megabreccia zone to identify additional priority drill targets. Results from the phase 1 drill program, geophysical surveys, historical drilling and new geological mapping will be integrated to refine targeting and guide continuing exploration activities;
• The drill program is designed to test extensions of known copper-molybdenum mineralization and evaluate new target areas within the broader mineralized system. Exploration activities will be carried out in accordance with applicable permits, environmental best practices and regulatory requirements;
• Field logistics are expected to include either an expanded exploration camp or accommodation through an existing floating logging camp in the area. Vanguard will continue to work closely with the Klahoose First Nation throughout the program, prioritizing continuing engagement, economic participation opportunities and collaboration with Klahoose-owned service providers, including a Klahoose-owned logging company where practicable;
• The drill program is being planned on an accelerated timeline to rapidly follow up on the recently announced drilling results, which confirmed a significantly expanded copper-molybdenum mineralized system at Redonda;
• In addition to copper and molybdenum, the company will continue to evaluate the potential presence and significance of rhenium as a possible byproduct associated with molybdenite mineralization, where appropriate, as exploration advances.

About Redonda

The Redonda project comprises nine mineral claims totalling 2,746.46 hectares, located approximately 40 kilometres northeast of Campbell River, B.C. The property is accessible year-round via scheduled barge service from Campbell River, with on-site access provided by approximately five kilometres of recently upgraded logging road from Redonda Bay. Active forestry operations maintain an extensive network of forest service roads across the claims.

Redonda lies within the Coast Suture zone between the Wrangellia terrane and the Coast plutonic complex. Early Cretaceous dioritic intrusions of the Coast plutonic complex are cut by at least three later intrusive phases: (i) a quartz plug; (ii) a wide, hornblende-rich dike locally brecciated over approximately 600 metres of exposed strike length; and (iii) several smaller feldspar dikes near the southwestern margin of the hornblende body. Copper-molybdenum mineralization is most strongly developed along the hornblende-rich dike, particularly within brecciated zones.

Drilling completed in fall 2025, including hole 25-01, confirms that copper-molybdenum mineralization associated with the hornblende dike extends to significant depths and thicknesses in cross-section. Hole 25-01 intersected continuous mineralization over much of its 510.74-metre length, substantially extending the vertical and downhole extent of mineralization previously defined by 2023 drilling and demonstrating that the system remains open at depth.

The geological setting at Redonda shares several characteristics with other porphyry-style copper-molybdenum systems in southwestern British Columbia, including the OKover and Gambier copper deposits.

Fieldwork has been conducted under a letter of support from the Klahoose First Nation within their traditional territory, together with a free use permit, drill permit and IP exemption issued by the Ministry of Energy, Mines and Low Carbon Innovation. Consultation with the Homalko First Nation has concluded and a permit for additional drill sites has been issued.

The results indicate that copper-molybdenum mineralization at the Redonda project is laterally and vertically continuous within the drilled area. A valid drill permit is in place, permitting continued drilling at the project during the 2026 exploration season.

Samples were submitted to ALS Canada Ltd. (ALS Laboratories) for geochemical analysis. Industry-standard quality assurance and quality control protocols were employed, including the insertion of certified reference materials and blanks at regular intervals within the sample stream.

The 2025 drill program was guided by targets and structural corridors interpreted from a previously announced airborne geophysical survey conducted by Precision GeoSurveys Inc., integrated with historical drilling and surface sampling data.

CuEq values are historical in nature and are based on metal prices and recovery assumptions disclosed by Stamper in its news release. Vanguard has not independently verified these assumptions and does not rely on these CuEq values as current disclosure.

Collaboration with Klahoose First Nation

Vanguard has made it a priority to work in close collaboration with the Klahoose First Nation throughout the exploration campaign, with a focus on local labour, training opportunities and the use of Klahoose-affiliated service providers for logistics where practicable. The company will continue engagement throughout the program, including regular updates on work plans and timelines, incorporation of feedback into field operations, and adherence to cultural heritage protocols and environmental best practices within Klahoose traditional territory. Vanguard will co-ordinate site access, safety and environmental monitoring with Klahoose representatives, and will continue to explore opportunities for capacity building and economic participation.

Quality assurance and quality control

Quality assurance and quality control (QA/QC) procedures included the insertion of certified reference materials, blanks and preparation duplicates into the sample stream. QA/QC samples were submitted to ALS Laboratories as blind samples. Analytical results demonstrate acceptable accuracy and precision, with no evidence of significant contamination or analytical bias.

Analytical procedures

Sample preparation and analysis were conducted by ALS Laboratories at its sample preparation facility in North Vancouver, B.C. Analytical work was completed at ALS laboratories in Vancouver, B.C. ALS Laboratories is independent of the company and is accredited to ISO/IEC 17025 standards for the analytical methods employed.

Core samples were prepared using ALS method PREP-31A, which includes crushing and pulverizing to produce a representative pulp. Multielement analyses, including copper and molybdenum, were performed using four-acid digestion with ICP-MS (ME-MS61). Samples returning overlimit copper values were reanalyzed using ore-grade four-acid digestion with ICP-AES (Cu-OG62) and overlimit multielement values were determined using ME-OG62.

The analytical detection limits for copper and molybdenum using the ME-MS61 method are 0.001 per cent copper (Cu) and 0.1 part per million (ppm) molybdenum (Mo), respectively. Sample sizes and preparation protocols were consistent with ALS Laboratories standard procedures.

Qualified person

The scientific and technical information contained in this news release has been reviewed and approved by J.T. Shearer, MSc, DIC, PGeo (British Columbia and Ontario), a consulting geologist who is a qualified person as defined under National Instrument 43-101, Standards of Disclosure for Mineral Projects. Mr. Shearer is not at arm's length with Vanguard Mining, as he has provided consulting geological services to the company.

About Vanguard Mining Corp.

Vanguard Mining is a Canadian mineral exploration company focused on the discovery and development of high-value strategic minerals. The company is currently advancing exploration projects in Argentina, Canada and Paraguay, with a focus on identifying and developing assets critical to the global energy transition. Vanguard is committed to responsible exploration and value creation through the acquisition and advancement of highly prospective uranium properties.

We seek Safe Harbor.