Tectonic Metals Drills 4.05 G/T AU Over 30.48 Meters, Including 8.84 G/T AU Over 13.72 Metres at Flat Gold Project, AlaskaChicken Mountain's Adit Zone Delivers Near-Surface High-Grade Gold with Expansion PotentialAssay Results Pending from 103 Additional Drill Holes Across Chicken Mountain, Alpha Bowl, Golden Apex, Black Creek and Jam Intrusion Targets VANCOUVER, BC / ACCESS Newswire / December 22, 2025 / Tectonic Metals Inc. ("Tectonic" or the "Company") (TSX-V:TECT)(OTCQB:TETOF) today announced additional assay results from 11 drill holes completed during the 2025 drill campaign at Chicken Mountain and the Adit Zone, located within the Company's flagship ~99,800 acre Flat Gold Project ("Flat") in Southwest Alaska.The 11 drill holes (9 reverse circulation ("RC") and 2 diamond core) reported herein represent approximately 1,460 m of drilling from the Company's 18,373 m, 125-hole, 2025 drill program across the Flat Gold Project. All drill holes intersected gold mineralization, with 10 of the 11 holes ending in mineralization, maintaining Tectonic's 100% drill-hit success rate at Flat.The RC fence of drilling announced today intersects a 550-metre-wide mineralized section that remains open in all directions highlighting the potential of the Adit Zone.Assay results from 103 additional drill holes are currently pending and expected to be reported in Q1 2026. Tectonic will provide further updates as results are received and interpreted.Please watch a video highlighting the scale and potential of the Adit Zone: Click Here to View VideoADIT ZONE DELIVERS NEAR-SURFACE HIGH-GRADE GOLDThe Adit Zone represents a high-priority, 2 kilometre ("kms") long gold target within the Chicken Mountain intrusion. The zone is defined by a strong gold-in-soil anomaly coincident with a magnetic low, a geophysical signature commonly associated with hydrothermal alteration and gold mineralization at the Flat Project and in Reduced Intrusion-Related Gold Systems ("RIRGS").The significance of the Adit Zone is further reinforced by its position flanked by three past-producing placer gold creeks - Happy Creek, Idaho Bench, and Slate Creek - which together produced approximately 206,400 ounces of placer gold*. This historical placer production is interpreted to have been shed from the Adit Zone's primary bedrock gold source (see Figure 1).Highlighting the emerging potential of this zone, drill hole CMR25-121 intersected:4.05 g/t Au over 30.48 metres , including8.84 g/t Au over 13.72 metresStarting from 53.34 metres hole length and ending in mineralizationPeter Kleespies, M.Sc.,P.Geo., Vice President of Exploration, commented:"These results showcase the strength of the Chicken Mountain intrusion gold system. We are seeing a compelling combination of near-surface high-grade mineralization at the Adit Zone alongside broad, continuous zones of bulk-tonnage mineralization at Chicken Mountain. What's remarkable is that every time we test the limits of the system, whether along strike or at depth, we continue to intersect significant gold mineralization."DRILL HIGHLIGHTS - CHICKEN MOUNTAIN'S ADIT ZONECMR25-12138.10 g/t Au over 3.05 m , within8.84 g/t Au over 13.72 m , within4.05 g/t Au over 30.48 mReverse circulation drill hole ending in mineralization 1.88 g/t Au over 3.05 m; total hole length 103.63 m (refer to Table 1)CMR25-1102.30 g/t Au over 3.05 m, and1.10 g/t Au over 9.14 m , all within0.44 g/t Au over 80.77 mReverse circulation drill hole ending in mineralization 0.50 g/t Au over 6.10 m, total hole length 112.78 m (refer to Table 1)KEY TAKEAWAYS1. Adit Structure: A High-Priority, High-Grade Structural CorridorLocated at a major structural contact between the Chicken Mountain (medium-grained monzonite) and Alpha Bowl zones (coarse-grained monzonite)Tectonic's current geological model identifies Adit as a key structural zone that was active during gold deposition, making it a prime location for the accumulation of higher-grade structuresDefined by a 2 km geophysical and gold-in-soil trend flanked by historically mined placer gold drainagesCurrent and historic drilling confirms mineralization over a 1 km strike length and to a depth of 200 m, with the system remaining open in all directionsCurrent and historic drilling and trenching have yielded higher-grade results near the surfaceUpcoming drilling is designed to expand the known mineralization at Chicken Mountain toward the Northeast and Northwest, bridging the gap toward Alpha BowlThese results confirm the presence of near-surface high-grade gold mineralization within a broader bulk-tonnage intrusive-hosted system, supporting the potential for high-grade starter pit scenarios within an open-pit development framework.2. Bulk-Tonnage, Open-Pit, with Emerging Higher Grade Starter Pit Potential and Vertically Extensive Gold System is in PlayThe RC fence drilling announced today intersected a 550-metre-wide mineralized section that remains open in all directions (See Figure 4 and video above)3