Chicken Mountain’s Adit Zone Delivers Near-Surface High-Grade Gold with Expansion Potential

Assay Results Pending from 103 Additional Drill Holes Across Chicken Mountain, Alpha Bowl, Golden Apex, Black Creek and Jam Intrusion Targets

Tectonic Metals Inc. (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 in Southwest Alaska.

The 11 drill holes (9 reverse circulation 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 Video

ADIT ZONE DELIVERS NEAR-SURFACE HIGH-GRADE GOLD

The 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, including
  8.84 g/t Au over 13.72 metres
• Starting from 53.34 metres hole length and ending in mineralization

Peter 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 ZONE

CMR25-121

• 38.10 g/t Au over 3.05 m, within
  8.84 g/t Au over 13.72 m, within
  4.05 g/t Au over 30.48 m
• Reverse 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)

CMR25-110

• 2.30 g/t Au over 3.05 m, and
  1.10 g/t Au over 9.14 m, all within
  0.44 g/t Au over 80.77 m
• Reverse 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 TAKEAWAYS

1. Adit Structure:  A High-Priority, High-Grade Structural Corridor

• Located 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 structures

• Defined by a 2 km geophysical and gold-in-soil trend flanked by historically mined placer gold drainages

• Current 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 directions

• Current and historic drilling and trenching have yielded higher-grade results near the surface

• Upcoming drilling is designed to expand the known mineralization at Chicken Mountain toward the Northeast and Northwest, bridging the gap toward Alpha Bowl

• These 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.

1. Bulk-Tonnage, Open-Pit, with Emerging Higher Grade Starter Pit Potential and Vertically Extensive Gold System is in Play

• The 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 km of mineralized strike length starting at surface (Chicken Mountain to Alpha Bowl, including the Adit Zone)

• Chicken Mountain continues to demonstrate scale and continuity – drilling continues to define a strong, large gold system both along strike, width and depth with consistent grade and thickness.

1. 100% Drill-Hit Success Rate Continues at Chicken Mountain

• 107 of 107 holes drilled to date and each drill hole has intersected gold mineralization

• 63 of 107 holes ended in gold mineralization

• Mineralization remains open at depth and is only constrained by drilled depth – not geology

1. Accelerating Toward Resource Definition

• Chicken Mountain is emerging as the primary path toward a maiden resource estimate at Flat

1. Geological Characteristics Consistent with RIRGS Models 

• Alteration, geometry, and grade distribution are consistent with Reduced Intrusion-Related Gold System (RIRGS) models, including notable similarities to Kinross Gold Corporation (TSX: K, NYSE: KGC) Fort Knox Mine in Alaska

1. Heap Leaching Processing Potential – A Competitive Advantage

• Latest assay results continue to intersect oxidized to partially oxidized quartz monzonite consistent with lithologies used in prior Flat metallurgical test work, further reinforcing the heap-leach processing potential

1. A summary of the results for the 9 RC holes is presented in Table 1 and a summary of the two core results are presented in Table 2. Data pertaining to locations of drill holes included in the announcement are presented in Table 3.

To learn more about the 2025 Drill Programs, click here: Tectonic Metals Delivers Record 18,372 Metres Across 125 Drill Holes at Flat Gold Project, Alaska

Click here to view drill plan maps and images. Select images below:

Figure 1: Oblique view of the Adit Structure relative to Alpha Bowl, Chicken Mountain, Golden Apex, the Placer Gold Production¹, and the gold-in-soil anomalous areas:

Figure 3: Plan view highlighting the locations of the Alpha Bowl, Adit, and Chicken Mountain Structures, 2025 assay results are highlighted in white boxes and, historical results are highlighted in yellow.

Table 1. Summary of Adit Zone Chicken Mountain RC Drill Assay Results* 

*All reported intercepts are reported as downhole lengths, as insufficient data exists to determine true widths. Select composites utilizing 0.10, 0.30 or 0.50 g/t Au cut-off with a maximum 3.1m continuous (two sample) below the cut-off inclusion.

Table 2. Summary of Adit Zone Chicken Mountain Core Drill Assay Results*

*All reported intercepts are reported as downhole lengths, as insufficient data exists to determine true widths. Select composites utilizing 0.10, 0.30 or 0.50 g/t Au cut-off with a maximum 3.1m continuous below cut-off inclusion.

Table 3. Details of Phase One Adit Zone Drill Holes at Chicken Mountain

To Learn More About Tectonic Metals:

Visit https://www.tectonicmetals.com/about/
View our 2025 Fact Sheet or Corporate Presentation

Tectonic invites you to take a virtual tour of our Flat Gold Project with both the CEO of Tectonic and one of Alaska’s largest for-profit Native Regional Corporations, Doyon Ltd.