Tectonic Metals completes Phase One drill program at Flat Gold Project, Alaska

Tectonic Metals Inc. [TSXV: TECT; OTCQB: TETOF] reported the successful completion of its 2025 Phase One drill program at its flagship Flat Gold Project in southwestern Alaska. Together with the upcoming and fully funded Phase Two drill program, the 2025 drilling campaign represents the largest and most comprehensive ever undertaken at Flat, establishing a new benchmark for exploration activity on the property and far surpassing all previous campaigns in both scope and intensity.

As part of the Phase One drill program, a total of 7,718 metres were drilled across 48 holes using both core and reverse circulation (RC) drilling methods. Phase One drilling targeted multiple intrusion-related gold systems, including Alpha Bowl, the majority of the drilled metres, as well as Chicken Mountain, Golden Apex, Black Creek and Jam. Complementing the drilling, Tectonic also completed a 2,125 line-km high-resolution drone airborne magnetic survey, providing the first modern coverage of all six priority, district-scale intrusive targets at Flat.

Drill samples are being processed at accredited analytical facilities, with assay results to be reported as they become available.

Tony Reda, Co-Founder, President & CEO of Tectonic Metals, commented: “What began as a $7 million financing for Phase One drilling in May 2025 quickly expanded into an 85% oversubscribed $12.7 million raise, giving us the foundation to execute a three-rig, Phase One drill program in record time. While assays are still pending, I am proud to report that every single Phase One objective has been successfully achieved. This disciplined execution not only validates our approach but also sets the stage for Phase Two and introduces a new Company objective – the delivery of Tectonic’s first-ever maiden inferred resource. This will be supported by the 2025 and next year’s drilling, as we continue to systematically de-risk Flat on its path toward potential development.”

2025 Phase One Drill Program Highlights: Tectonic successfully delivered on every objective set out at the start of the 2025 Phase One drill program, advancing Alpha Bowl, Chicken Mountain, Golden Apex, and for the first time, testing Black Creek and Jam, two new district-scale intrusion targets.

Alpha Bowl: Drilling tested for scale, grade and continuity. Oriented drill core collected; structural and alteration controls being defined.

Key drill core observations: visible gold observed in a number of quartz veins; multiple generations of veining, including sheeted, brecciated and late-stage carbonate veins; clear structural overprinting (cross-cutting veins, brecciation, faulting) and strong sericite (potassic) alteration halos associated with mineralized veins.

Chicken Mountain – Metallurgy: 660 metres, in four holes, core drilled for additional heap leach column tests, including 2″ crushed material; complements prior heap leach recoveries of 96% and 91% on 3/4″crushed material.

Key drill core observations: widespread sheeted quartz and quartz-carbonate-sulfide veining; strong pervasive sericite alteration overprinting the quartz monzonite host; observed structural complexity with multiple vein generations and late-stage faulting and intervals of oxidation with iron-oxide staining.

Oriented drill core collected: Oriented drill core collected for ongoing refinement of the structural model. Potential starter pits: near surface, higher-grade mineralized corridors drill tested.

Golden Apex: Step-out core drilling completed near historic 2003 drill hole GA03-02; stratigraphy logged; oriented core collected for structural analysis and portable XRF analysis confirms bi-modal pathfinder associations (Cu+Bi and As+W).

Key drill core observations: alteration associated with intense fracturing and abundant veining and observed sulfide mineral assemblages include chalcopyrite, arsenopyrite, pyrrhotite and pyrite.

High resolution drone magnetics survey completed – a proven and critical tool for targeting blind intrusion systems at Flat. Data interpretation ongoing, will be utilised in Phase 2 and 2026 drill programs.

Phase Two drilling will advance Chicken Mountain towards a maiden inferred mineral resource estimate, follow up drilling at Alpha Bowl and potentially unlock other intrusion targets. Phase Two drilling has commenced and a dedicated Phase Two program news release will be issued in the coming weeks.

The Alpha Bowl target, interpreted as a potential large, reduced intrusion-related sheeted quartz vein gold system (RIRGS), was the principal focus of Tectonic’s 2025 Phase One drill program. Drilling followed up on the Company’s 2024 discovery, which identified bedrock gold-bearing zones beneath surficial cover and within areas historically disturbed by placer mining.

Phase One drilling at Alpha Bowl totalled approximately 4,600 metres across 24 drill holes, utilizing both diamond core and RC drill methods. The program tested an area measuring roughly 600 m by 700 m, with drill fences arranged in parallel lines spaced approximately 100 metres apart. Drilling specifically targeted sheeted quartz vein systems developed within granitoid intrusions – a hallmark setting of reduced intrusion-related gold systems. Diamond drill holes were completed to maximum depths of up to 392 metres.

Drilling has revealed three main types of potentially gold-related veins: sheeted quartz-sulfide veins – closely spaced, consistently oriented veins of quartz with sulfides (chalcopyrite, pyrrhotite, arsenopyrite, molybdenum) and occasionally visible gold; quartz-carbonate-arsenopyrite veins – larger veins with alteration halos (sericite, carbonate, arsenopyrite) that can appear brecciated (broken and resealed). These veins are chemically distinct, marked by arsenic, antimony, mercury, tungsten and molybdenum. They often align with the finer-grained dikes, suggesting repeated pulses of mineralizing fluids and arsenopyrite stringers – zones dominated by arsenopyrite occurring as dense networks of fine- to coarse-grained veins.

Later generations of calcite-rich veins cut across all three of these earlier vein types, occasionally showing oxidation and secondary copper minerals (like chalcocite and copper oxides).

The Chicken Mountain intrusion is interpreted to be roughly 6.5 km x 6.0 km in size and currently the most advanced target at Flat. Chicken Mountain has been the focus of past drilling on the property. During Phase One 2025, Tectonic completed 1,013 metres of core drilling in five holes and 798 metres of RC drilling in five holes.

The program was designed to test for potential extensions of known mineralization in the underexplored northern and eastern portions of the target. In addition, 660 m of core drilling in four holes was completed as infill within areas of established quartz monzonite-hosted mineralization as a continuation of Tectonic’s metallurgical testwork. Objectives included the collection of oriented PQ core for structural analysis and metallurgical sampling. Of this, 450 metres was drilled as PQ-sized core, providing 2-inch diameter material for coarser crush column testing to advance heap leach metallurgical studies.

Drilling intersected variably altered and oxidized quartz monzonite hosting varying densities of planar sheeted quartz, quartz-carbonate, and quartz-carbonate-sulfide veins (arsenopyrite + pyrite, locally with stibnite), together with oxidized vein assemblages. These features are consistent with the previously observed multi-phase intrusion-related gold system documented at Chicken Mountain.

The Golden Apex target is interpreted to be a ~2.5 km x 2.5 km blind reduced intrusion-related gold system (RIRGS) situated some 3,000 metres northeast of Chicken Mountain, offset between the Alpha Bowl target to the south and the exposed Black Creek stock to the north. Drilling completed at Golden Apex in 2025 totals 470 metres, comprising 269 metres from one core hole and 201 metres from two RC holes. The RC holes were drilled northeast of Alpha Bowl to evaluate a possible eastward offset of the Alpha Bowl intrusion along the right-lateral Golden Apex Fault.

The Black Creek stock hosts multiple mineralization styles, including monzonite-hosted RIRGS mineralization within the main intrusive body and vein-style mineralization developed along its margins, where gabbro/monzodiorite phases intrude Kuskokwim sediments and associated hornfels.

As part of the 2025 Phase One drill program, Tectonic drilled 616 metres in nine RC holes along a 300-metre fence across the eastern margin of the stock. This drilling was designed to test the hornfels and vein-hosted mineralization adjacent to marginal intrusion phases. The fence was positioned approximately 50 metres south of historic hole F79-02 (which intersected 73.76 m grading 0.72 g/t Au) to specifically evaluate hornfels to the east of the historic hole, as well as gabbro/monzodiorite phases to the west.

Drilling in 2025 intersected highly oxidized, hornfelsed Kuskokwim sediments with felsic dykes across the first ~175 m of strike, transitioning into the expected mafic intrusive phases over the final ~125 m of the fence.

The Jam target represents one of six RIRGS targets currently being evaluated at Flat. During the 2025 Phase One drill program, two RC holes were drilled from a single pad, totalling 203 metres. The program was designed to test both the northern extension of an historically mined high-grade, narrow quartz vein hosted in augite basalt (previously accessed by shallow shafts and adits), as well as the potential presence of a felsic intrusion interpreted to underlie the Jam area.

The two holes were drilled to vertical depths of up to 95 m, with both intersecting variably oxidized, altered, and veined augite basalt throughout. Within the unoxidized sections, chip logging observed sulfide assemblages comprising arsenopyrite, pyrite and chalcopyrite.

While the targeted felsic intrusion was not intersected, the pervasive veining and alteration observed in drilling is considered highly suggestive of a local intrusive source at depth.

As part of the 2025 Phase One drill program, Tectonic completed a 2,125 line-km high-resolution drone magnetic survey across prospective lithological assemblages of the Flat volcano-plutonic complex. Final processed data magnetic maps have been received, with 3D inversion modelling expected in the coming weeks.

This survey provides the first modern district-scale magnetic coverage of Flat, designed to define intrusions, alteration zones, and structural corridors that may control gold mineralization. The results will refine drill targeting, generate new prospects, and accelerate discovery across the ~99,000-acre project.