Tectonic Metals drills 272 metres of 0.50 g/t gold; confirms bulk-tonnage potential at Heap-Leachable Chicken Mountain, Flat Gold Project, Alaska

Tectonic Metals Inc. [TSXV: TECT; OTCQB: TETOF] reported final assay results from the 2025 drill program at Chicken Mountain. Today’s results delivered thick, at or near-surface intercepts that reinforce Chicken Mountain as a bulk-tonnage, heap leachable Reduced Intrusion Related Gold System (RIRGS) within the company’s flagship 99,800-acre Flat Gold Project, Southwest Alaska.

The 2025 drilling program successfully advanced Chicken Mountain from an exploration target into a kilometre-scale resource growth opportunity, expanding the continuously mineralized footprint and delineating higher-grade corridors that may support potential starter-pit development scenarios.

Tectonic plans to resume drilling in early May 2026, and additional metallurgical test work is now underway, including 2-inch crush heap-leach column tests to investigate the viability of run-of-mine (ROM) gold processing.

CEO Commentary: “Chicken Mountain demonstrates a combination of scale, continuity and favorable metallurgy in a bulk-tonnage gold system. Unlike narrow vein deposits that rely on selective mining, this style of mineralization has the potential to support simpler, straightforward open-pit development, with broad, continuous zones that begin at surface and remain open in all directions.

“What differentiates Chicken Mountain is the convergence of three key value drivers. First, scale: we’ve defined approximately 3.3 km of mineralized strike to date, with widths approaching 700 metres, while drill testing only a fraction of the mapped intrusive complex. Second, predictability: a 100% drill success rate across 191 holes demonstrates a fertile and strong mineralizing system that can be targeted effectively. Third, metallurgy: previously reported heap-leach recoveries of up to 96%, together with ongoing work evaluating run-of-mine potential, point to a processing profile with meaningful capital and operating advantages.

“Within this large mineralized, envelope, we’ve identified multiple higher-grade corridors that could represent potential mining starter-pit opportunities. Beyond the intrusion itself, the hornfelsed sedimentary rocks surrounding Chicken Mountain represent an additional, untested and underexplored opportunity. At Black Creek, located 6 km away, drilling intersected 4.50 g/t Au over 48.77 m with 7.79 g/t Au over 24.38 m hosted in hornfels – the same prospective host rock that surrounds Chicken Mountain.

“As we move forward, our focus is clear: continued step-out drilling to define the ultimate scale of the Chicken mountain RIRGS system, advancing metallurgical work toward a potential run-of-mine flowsheet, and progressing toward a maiden mineral resource estimate. Each of these workstreams is aimed at systematically de-risking Chicken Mountain while preserving its significant growth potential.”

Assay results from 16 drill holes are reported herein – 9 diamond core holes and seven reverse circulation (RC) holes – representing approximately 3,535 metres of drilling from the company’s 18,373 m 2025 program. Drilling targeted step-out expansion and early-stage resource delineation in the central area of the Chicken Mountain intrusion. All assay results from the 2025 drill program are now reported.

Drill Highlights – CMD25-031: Entire Drill Hole Mineralized: 0.70 g/t Au over 32.00 m, and 15.05 g/t Au over 1.00 m, and 1.14 g/t Au over 19.00 m, all within 0.50 g/t Au over 272.00 m. Diamond core drill hole; total hole length 303.58 m.

CMD25-028: Entire Drill Hole Mineralized: 1.02 g/t Au over 11.00 m, and 1.27 g/t Au over 13.00 m, and 1.16 g/t Au over 12.00 m, within 0.74 g/t Au over 61.00 m, and all within 0.49 g/t Au over 277.55 m. Ended in mineralization; total hole length 327.6 m (diamond core drill hole).

CMD25-021: 2.20 g/t Au over 14.00 m, within 1.39 g/t Au over 24.00 m, all within 0.44 g/t Au over 192.48 m. Ended in mineralization with the final 5.00 m at 2.45 g/t Au; total hole length 297.48 m (diamond core drill hole).

CMD25-023: 2.33 g/t Au over 10.00 m, within 1.09 g/t Au over 29.00 m, all within 0.59 g/t Au over 120.00 m. Diamond core drill holes; total hole length 306.63 m

CMD25-019: 0.82 g/t Au over 52.00 m, and 1.18 g/t Au over 25.00 m, and 0.92 g/t Au over 26.00 m, and 0.92 g/t Au over 29.00 m, all within 0.58 g/t Au over 186.06 m. Diamond drill core total hole length 303.58 m.

CMR25-118: 5.18 g/t Au over 4.57 m, within 2.08 g/t Au over 12.19 m. Ended in in mineralization; total hole 48.77 m (RC drill).

CMD25-018: 0.86 g/t Au over 23.00 m, and 0.86 g/t Au over 17.00 m, all within 0.49 g/t Au over 141.00 m. Ended in mineralization; total hole length 361.00 m (diamond drill core).

CMD25-025: 0.77 g/t Au over 22.65 m, all within 0.44 g/t Au over 144.00 m. Ended in mineralization; diamond drill core total hole length 352.96 m.

2025 drilling has successfully transitioned Chicken Mountain from Exploration Target into a multi-kilometre gold resource growth opportunity.

Scale & Continuity: Chicken Mountain is interpreted as a Reduced Intrusion-Related Gold System hosted within a receptive monzonitic intrusive complex. Drilling has defined a mineralized envelope measuring 3.3 km in strike, up to 700 metres in width, and extending to 300 metres vertical depth.

Multiple drill holes intersect ~275 metres of continuous gold mineralization starting at surface and indicating a coherent body of mineralized rock.

While drilling to date has defined a significant envelope of mineralization, the broader Chicken Mountain system extends well beyond current drilling: Gold-in-soil anomaly: ~4.0 km in length; mapped intrusive (monzonitic) complex: ~4.5 km × 3.0 km and geophysical intrusive footprint: ~6.5 km × 6.0 km.

Untested Hornfels Target: The Chicken Mountain intrusion is surrounded by hundreds of metres of hornfels, a baked sedimentary rock that commonly hosts gold in intrusion-related systems. This prospective host rock remains entirely untested at Chicken Mountain but has been validated at Tectonic’s Black Creek intrusion target, located 6 km from Chicken Mountain, where recent drilling intersected 4.50 g/t Au over 48.77 metres, including 7.79 g/t Au over 24.38 metres, confirming the fertility of hornfels units at Flat.

Unconstrained Growth Potential: Mineralization remains open in all directions and is constrained only by drilling, not geology.

100% Drill Success Rate Continues: 191 of 191 Chicken Mountain holes intersected gold mineralization.

61% of all drill holes (117 of 191 holes) ended in mineralization, including today’s reported drill holes CMD25-021, which ended in 5.00 metres of 2.45 g/t Au, and CMR25-120 which ended in 4.57 metres at 1.94 g/t Au implying the ultimate depth and strike of the system have not yet been bracketed.

Reduced Exploration Risk: With 100% of the drill holes intersecting mineralization, the exploration risk regarding continuity is reduced. The system appears to be targetable, robust, and pervasive.

Higher-Grade Internal Architecture: The identification of higher-grade corridors, six in total now across the 3.3 km of drilled strike, within the broader lower-grade envelope warrants drill follow up. These zones have the potential to represent mining starter-pit opportunities for early capex payback.

Two strategic fences drilled and reported today: Results reported from two drill fences L1 (4 core holes) and L2 (6 RC and 4 core holes) drilled across the Chicken Mountain intrusion.

Width of mineralization envelope along both drilled sections is 700 metres. Core drilling on both sections confirms mineralization to 300 metres vertical depth and remains open.

Multiple holes ended in mineralization, supporting potential for down-dip and along-strike expansion.

Exploration Outlook 2026 – Chicken Mountain/Alpha Bowl Drilling: Expansion and targeted drilling of six identified higher-grade corridors for grade-tonnage optimization; systematic step-out drilling to define system limits and test depth extensions and infill drilling to support maiden mineral resource estimate.

Regional Target Testing: Follow-up expansion drilling at Black Creek (4.50 g/t Au over 48.77m), Golden Apex and Jam – each representing kilometer-scale intrusive targets.

Surficial geochemical sampling across the property. Demonstrate Flat as a potential district-scale gold camp, not a single-intrusion story.

Technical De-Risking: Metallurgical optimization additional testing, including column testing, to evaluate crush size reduction and ROM potential.

3D geological, geochemical, and structural modeling to refine drill targeting. Continued engagement with independent mineral resource and engineering groups to advance pre-development studies.

Samples are placed in sealed and security tagged bags and shipped directly to the MSA facility in Fairbanks, Alaska, utilizing strict Chain of Custody protocols.