Tectonic Metals Drills 5.09 g/t Au over 21.34 metres at Black Creek - Second Gold Centre Emerging at Flat Gold Project, Alaska

Multiple High-Grade Drill Intercepts, Broad Intervals and Holes Ending in Mineralization Signal a Growing Gold System; Six Additional Drill Holes Pending

VANCOUVER, BC / ACCESS Newswire / August 25, 2026 / Tectonic Metals Inc. ("Tectonic" or the "Company") (TECT:TSXV)(TETOF:OTCQB)(T15B:FSE) today reported new drill assay results from Black Creek, one of six intrusion-related district targets located within the Company's flagship 99,840-acre Flat Gold Project ("Flat") in southwest Alaska, U.S. The results confirm a second consecutive season of high-grade gold mineralization at Black Creek and strengthen the Company's view that the target has the potential to emerge as a second gold intrusive centre at Flat, approximately six kilometres ("km") northeast of the main bulk-tonnage, heap leach Chicken Mountain target.

2026 Black Creek Drill Assay Highlights

• CMR26-152: 5.09 grams per tonne gold ("g/t Au") over 21.34 metres ("m") including 17.34 g/t Au over 6.10 m;

• CMR26-153: 1.89 g/t Au over 57.91 m, including 2.75 g/t Au over 38.10 m with 6.31 g/t Au over 7.62 m and 3.89 g/t Au over 6.10 m; and,

• CMD26-041: 3.26 g/t Au over 5.06m and 16.73 g/t Au over 2.20 m, including 29.91 g/t Au over 1.22 m.

• Importantly, both reverse-circulation ("RC") holes CMR26-152 and CMR26-153 ended in mineralization, providing clear opportunities to expand the system further at depth and along strike.

Multimedia

• Black Creek Drill Plan Maps and Images

• Black Creek Drill Plan Video

Assays are also pending from six additional Black Creek drill holes, including holes that intersected prospective hornfels and mafic dykes, features typically associated with higher-grade mineralization at Black Creek and other Reduced Intrusion Related Gold Systems (RIRGS).

The latest results build on Black Creek's initial 2025 drilling, reported by the Company on January 29, 2026^[1], which returned 4.50 g/t Au over 48.77 m, including 7.79 g/t Au over 24.38 m and 15.19 g/t Au over 6.10 m. Together, the recurring high-grade results, broad mineralized intervals, large exploration footprint and improving geological model strengthen Tectonic's view that Black Creek has the potential to emerge as a second gold intrusive centre at Flat.

Tony Reda, Co-Founder, President & CEO of Tectonic Metals, commented:

"Our 2025 drilling established Black Creek as a compelling high-grade discovery. These 2026 results take it further, delivering multiple high-grade intercepts over meaningful widths with the system remaining open in all directions. Importantly, high-grade gold is now recurring across multiple holes and successive drill programs within the same prospective hornfelsed intrusion-margin setting. Together, these results are defining a coherent geological pattern and providing growing evidence of a potentially significant gold system.

"I have always believed that big gold systems leave big footprints. At Black Creek, drilling lies within a much larger, kilometre-scale convergence of gold-in-soil anomalies, geophysics, favourable geology and significant historical placer and lode gold production. We have tested only a small portion of that footprint, yet we are already seeing important indicators of grade and scale. Our next step is to further understand the geological controls, establish continuity and systematically test the scale of the system.

"Located six kilometres from Chicken Mountain, Black Creek is emerging as a potential second significant gold centre within Flat's more than 20-kilometre-long volcano-plutonic complex. Its high-grade mineralization occurs in a different host rock than the monzonite-dominant mineralization at Chicken Mountain, demonstrating that gold at Flat is not confined to a single intrusion or geological setting. Black Creek is one of six kilometre-scale intrusion-related targets identified to date, collectively highlighting an opportunity that extends well beyond one potential deposit, one intrusion and one host rock."

Figure 1: Simplified regional geology map of the Flat Gold Project, highlighting the Black Creek drilling area.

Black Creek: Building Evidence of a Second Gold Centre

Tectonic prioritized Black Creek for follow-up drilling in 2026 after its first-ever program at the target returned near-surface high-grade gold in hornfelsed sedimentary rock: 4.50 g/t Au over 48.77 m in hole CMR25-059, including 7.79 g/t Au over 24.38 m and 15.19 g/t Au over 6.10 m. The 2026 program was designed to test whether the 2025 drill discovery was part of a broader mineralized system.

The new drilling was successful in expanding the Black Creek system. High-grade gold has now been intersected in multiple holes and successive drill campaigns, with broad mineralized envelopes surrounding higher-grade internal intervals. Both 2026 RC holes ended in mineralization, and the deepest high-grade interval in diamond hole CMD26-041 occurs at approximately 202 m downhole, demonstrating gold mineralization through a substantial vertical range.

Broader mineralization of 0.39 g/t Au over 29.50 m, 0.66 g/t Au over 16.68 m and 0.41 g/t Au over 27.25 m was hosted in heavily fractured oxidized and non-oxidized hornfels and altered mafic dyke units with centimetre- to millimetre-scale quartz-to-quartz carbonate veining. Higher grade intervals, represented by 16.73 g/t Au over 2.22 m. were hosted within quartz-carbonate-stibnite veining. This newly intersected mineralization in the diamond drilling suggests that mineralization continues at depth from near-surface high-grade mineralization and remains open in all directions.

The Black Creek intrusion lies approximately six km northeast of Chicken Mountain within the more than 20-kilometre-long Flat volcano-plutonic complex. The target is supported by a 2.3 km by 1.5 km resistive electromagnetic anomaly and an approximately 1,500 m by 700 m gold-in-soil anomaly, providing a large exploration framework relative to the area tested by drilling to date.

The broader target area also has a substantial historical gold endowment and a long history of placer gold production, totalling approximately 450,000 ounces from Black Creek and upper Otter Creek. The historical hard rock mine at Black Creek reportedly produced approximately 2,707 ounces of gold at an average grade of 12.00 g/t Au between 1925 and 1938.^[2]

The convergence of historical gold production, kilometre-scale soil and electromagnetic anomalies, and repeat high-grade bedrock intercepts signals a compelling, multi-dataset exploration vector. Drilling has tested only a small portion of that broader footprint.

Figure 2: Black Creek regional geology, drilling area, and soil contour map, highlighting the mineralized corridors and the gold-in-soil anomaly

Drilling Refines the Geological Model at Black Creek and Other Regional Targets, Providing Clearer Vectors to Higher-Grade Gold

The 2026 program is materially improving Tectonic's understanding of the lithological and structural controls on gold at Black Creek and providing a vectoring framework that may be applicable elsewhere across the Flat district.

Gold is hosted principally in altered and hornfelsed Kuskokwim Group clastic sedimentary rocks and is associated with quartz to quartz-carbonate-stibnite veining, oxidation, fracturing and mafic dykes. Higher-grade intervals occur within this broader mineralized hornfels package, locally near mapped or modelled mafic dykes.

This host setting is geologically important because hornfelsed sedimentary rocks occur along intrusion margins elsewhere at Flat, including Chicken Mountain, Golden Apex, Horseshoe, Jam and Caribou. As a result, Black Creek establishes a district-relevant exploration model in a host rock that significantly expands the prospective search space beyond intrusion-hosted mineralization alone.

Updated geologic modelling is integrating lithology, hornfels intensity, mafic dykes, intrusion contacts, veining and assay data. The emerging model will be used to test whether higher-grade shoots are controlled by intrusive contacts, dyke margins, structural permeability, or the intersection of these features. Oriented follow-up drilling is required to resolve geometry and true widths.

Figure 3: Updated geological model of the Black Creek Target Area, notably updated hornfels and mafic dyke units that have been observed and characterized to host higher-grade gold mineralization.

Maggie Layman, Vice President Exploration, commented:

"The 2026 drilling is providing an important step forward in our understanding of Black Creek. The association of mineralization with hornfels, mafic dykes and intrusion contacts is helping us refine our geological model and identify priority targets for follow-up drilling.

"With mineralization remaining open in multiple directions and additional assays pending, we see a strong opportunity to continue expanding and defining not only the Black Creek system but also to apply these geological insights to other priority targets across the Flat district."

Multiple Catalysts Ahead

Tectonic is advancing Black Creek alongside Chicken Mountain and a portfolio of kilometre-scale intrusion-related targets as part of a systematic strategy to test the full district-scale potential of Flat. Near-term catalysts and exploration activities include:

• Assays pending from six additional Black Creek drill holes, several of which intersected prospective hornfels and mafic dykes;

• Follow-up drilling below CMR26-152 and CMR26-153 and along strike to test continuity, orientation and true width;

• Integration of assay, structural, lithological and geophysical data into the three-dimensional geological model; and

• Application of the emerging Black Creek targeting model to other intrusion-margin targets across the Flat district.

• Additional assay results from Chicken Mountain are also expected as Tectonic continues expansion and resource-definition drilling toward a maiden mineral resource estimate targeted for early 2027.

Figure 4: Cross section L1-L1' showing updated Mafic Dyke units and Hornfels, highlighting the higher-grade mineralization across the drilled section

Figure 5: Cross section L2-L2' showing updated geological model, highlighting the latest high-grade drill composites and holes with assays pending.

A summary of the assay results is presented in Table 1.

Table 1 - 2026 Black Creek Drill Assay Results