Casa Minerals Receives Extensive Historic Drill Database from Congress Gold Mine Project; Desktop Technical Studies Define Three Priority Exploration Zones Ahead of 2026 Drilling Season

Casa Minerals Inc. (TSXV: CASA) (OTCQB: CASXF) (FSE: 0CM) (the “Company” or “Casa”) is pleased to announce that it has received a large dataset of historic drill hole information from the Congress Gold Mine Project in Yavapai County, Arizona, USA. Comprehensive desktop technical studies integrating this data with the Company’s own 2022 drilling campaign have resulted in the identification and delineation of three distinct priority exploration zones that will form the basis of the 2026 field and drilling program.

HIGHLIGHTS

• Receipt of a large historic drill hole database greatly expanding the geological model for the Congress Gold Mine Project
• 3D modelling of over 100 historic and recent drill holes confirms strong structural integrity and continuity of the gold-bearing vein systems
• Three distinct exploration zones classified: Echo Bay Exploration Zone (~750m x 1,000m), Malartic Exploration Zone (~450m x 1,150m), and New Congress Niagara Exploration Zone (~800m x 1,000m)
• Echo Bay Exploration Zone designated highest priority target based on historic drill density and potential for expanded mineralization envelope
• Historic drill intercepts include highlights such as 1.2m @ 43.88 g/t Au, 2.0m @ 21.88 g/t Au, 3.3m @ 27.13 g/t Au, and 11.4m @ 4.81 g/t Au within the Echo Bay Zone
• Congress Gold Mine Project is fully permitted with excellent road access and proximity to an experienced regional labor force
• Company geologists and field personnel are being mobilized for initial site preparation and drill program setup

HISTORIC DRILL DATABASE COMPILATION

Casa Minerals is pleased to announce the receipt of a comprehensive dataset of historic drill hole collars, surveys, and assay records from the Congress Gold Mine Project. This data was compiled from exploration programs conducted by previous operators — most notably Echo Bay Mines Ltd. — during the 1980s through the early 1990s. The database encompasses a significant number of drill holes distributed across the project area, substantially expanding the known geological framework of the property.

Historic exploration at the Congress Gold Mine was conducted during a period when gold market conditions were materially lower than today’s environment, which directly influenced the selection criteria and cut-off grades used by previous operators. Consequently, the historic programs focused predominantly on higher-grade gold intersections, and many lower-grade vein intercepts that may be economically significant at current gold prices were not assigned the same level of analytical priority. Casa believes this creates a meaningful opportunity to reinterpret the mineralization system with a lower economic threshold, logically expanding the dimensions of the mineralization envelope that will be targeted in the forthcoming drilling season.

Important Disclosure: The historic drill hole results referenced in this news release were collected and reported by previous operators under practices that predate current NI 43-101 standards. These results are disclosed solely for contextual and geological interpretation purposes. They have not been verified by a current Qualified Person, do not conform to NI 43-101, and are not classified as current mineral resources or mineral reserves. A Qualified Person has not done sufficient work to classify the historic results as current mineral resources or mineral reserves, and Casa is not treating them as such.

THREE-DIMENSIONAL MODELLING AND VEIN SYSTEM VALIDATION

Desktop technical studies have included rigorous 3D modelling of all available drill hole data using industry-standard geological modelling software. The resulting three-dimensional representation of the drill hole database, illustrated in Figure A below, demonstrates the remarkable density of historic drill coverage across the project and confirms the structural coherence and continuity of the principal gold-bearing vein systems.

The 3D model was constructed using NAD83 / UTM Zone 12N coordinates and captures drill holes ranging from surface to depths approaching 600 metres below ground elevation. The model reveals that:

• The dominant vein systems exhibit strong northeast-southwest structural orientation, consistent with the principal fault architecture identified on surface
• The alignment and attitude of vein structures intercepted in the Company’s 2022 confirmatory drilling campaign correlate with high fidelity to those projected from the historic drill hole database, validating the overall geological model
• The 2022 drilling campaign identified additional vein structures not captured in the historic database, indicating that the current geological model is likely incomplete and that the total mineralized footprint may be materially larger than previously understood
• Incorporating lower-grade vein intercepts — previously deprioritized by historic operators under lower gold price conditions — into the mineralization envelope substantially increases the aggregate target volume for future drilling

THREE PRIORITY EXPLORATION ZONES — 2026 PROGRAM BASIS

Detailed integration of the historic drill database with geological mapping, vein system mapping conducted in 2022, and structural interpretation has enabled Casa to formally classify three distinct priority exploration zones within the Congress Gold Mine Project. The classification of each zone reflects the combination of historic drill density, vein system geometry, and the nature of the gold mineralization documented to date. Figures 1 through 4 present these zones in their regional and local contexts.

Echo Bay Exploration Zone — Highest Priority Target

The Echo Bay Exploration Zone, measuring approximately 750 metres by 1,000 metres, is the largest and most intensively drilled zone on the property. It encompasses the historic non-NI 43-101 resource outline that was previously defined by Echo Bay Mines and represents the core of the historic gold-producing system at Congress. The zone is bounded by the principal northeast-trending veining corridors and is cut by northwest-trending fault structures that locally displace but do not terminate the mineralized vein arrays.

As illustrated in Figure 2, the Echo Bay Exploration Zone hosts a dense cluster of historic drill hole intercepts distributed across the full extent of the zone. The drill hole collars and assay intercepts depicted in the figure provide compelling evidence for broad, zone-scale gold mineralization. Notably, the higher-grade intercepts are concentrated along the principal vein corridors while lower-grade disseminated and stockwork gold is documented in the intervening ground. This spatial distribution is characteristic of orogenic gold systems and is consistent with the geological setting at Congress.

Selected historic drill intercepts within the Echo Bay Exploration Zone include:

• 1.2m @ 43.88 g/t Au — exceptional high-grade intercept within the principal vein corridor
• 3.3m @ 27.13 g/t Au — high-grade intercept demonstrating vein width and continuity
• 2.0m @ 21.88 g/t Au — high-grade vein intercept in the central portion of the zone
• 2.4m @ 19.03 g/t Au — confirming strong grade continuity along strike
• 11.4m @ 4.81 g/t Au — broad, elevated-grade intercept indicative of wide mineralization envelopes within the vein system
• 1.5m @ 15.28 g/t Au — demonstrating high-grade vein core and broader lower-grade haloes
• 2.0m @ 12.19 g/t Au and 7.3m @ 11.00 g/t Au — further confirming grade and continuity of the principal vein arrays
• 3.1m @ 11.19 g/t Au and 2.0m @ 15.63 g/t Au — documented in the southwestern portion of the zone, indicating lateral continuity

Read more: https://www.acnnewswire.com/press-release/english/105896/