Nullagine Hydrogen Publishes In-Depth Geological Report on Woods Property Gold Exploration in Northern Saskatchewan

Key Points<\/h3>

• Company: Nullagine Hydrogen, ASX code: NHU<\/li>
• Technical report by Yeomans Geological Inc. on Woods Property, northern Saskatchewan, Canada<\/li>
• Report encompasses Spruce, Pine, and Aspen Properties underlain by the Grease River Shear Zone (GRSZ), which extends over 400 kilometres in strike length<\/li>
• Historical gold mineralisation found by Cominco in silicate facies iron formation about 25 kilometres along the GRSZ trend serves as a geological analogue<\/li>
• Complex structural geology identified across four domain boundaries within the GRSZ, with multiple deformation phases documented<\/li>
• Investors should monitor drilling campaigns, sampling data, and further resource delineation at the Woods Property<\/li> <\/ul> <\/div>

  Yeomans Geological Inc. Releases Detailed Report on NHU’s Woods Property in Saskatchewan<\/h2>

  Nullagine Hydrogen (ASX:NHU) has officially published a technical report by independent consultants Yeomans Geological Inc. covering the Woods Property in northern Saskatchewan, Canada. This report delivers an extensive geological overview of NHU’s Spruce, Pine, and Aspen Properties, establishing a scientific basis for current and future exploration efforts.<\/p>

  The publication of this formal technical report marks a key advancement in mitigating exploration risk by outlining the geological setting, structural framework, and historical exploration data that guide drilling targets and program planning. For NHU investors, it demonstrates progress through established technical due diligence, with independent expert validation lending credibility to the company’s geological model.<\/p>

  The Grease River Shear Zone: A Major 400-Kilometre Structural Feature Driving Exploration<\/h2>

  The report identifies the Grease River Shear Zone (GRSZ) as the primary structural influence across the southern parts of the Spruce, Pine, and Aspen Properties. The GRSZ extends over 400 kilometres in strike, trending northeast from beneath the Athabasca metasedimentary basin into exposed Archean basement northeast of Lake Athabasca. The deformation corridor ranges from three to five kilometres wide.<\/p>

  The GRSZ’s importance to NHU’s exploration cannot be overstated. Such major regional shear zones worldwide often channel hydrothermal fluids and are commonly associated with economically significant mineral deposits, including gold. The report notes that the GRSZ affects multiple rock types along the northwestern edge of the Tantato Domain boundary, creating a structurally complex and potentially mineralised environment across NHU’s tenements.<\/p>

  Archean Basement and Multi-Phase Metamorphism Across NHU’s Properties<\/h2>

  Yeomans Geological documents that Archean mafic to felsic basement rocks on the Properties underwent amphibolite to granulite-facies metamorphism within the Tantato Domain, followed by retrograde greenschist facies overprinting linked to the GRSZ. Dodge Domain rocks were metamorphosed to granulite facies before being overprinted by a later amphibolite facies event, reflecting a prolonged, multi-phase geological history spanning billions of years.<\/p>

  Mylonitic mafic units include amphibolite, biotite schist, and biotite gneiss, while felsic mylonitic units comprise biotitic quartzofeldspathic gneiss. The report records that mylonitized garnetiferous psammitic to pelitic gneisses, garnetiferous felsic gneisses, and silicic lean banded iron formations have been intruded by at least two Archean intrusive suites: the Chipman mafic dike and sill swarm at 3.18 billion years ago, granitoid plutons between 2.63 and 2.6 billion years ago, and an early Proterozoic granitoid suite around 1.9 billion years ago.<\/p>

  Banded Iron Formations Along the GRSZ and Their Mineralisation Potential<\/h2>

  A key geological feature identified is the presence of banded iron formations (BIFs) along the GRSZ near the Woods Properties. These chemical sediments likely precipitated along a paleo-topographic trough related to the GRSZ and are interpreted as ancient exhalative hydrothermal deposits associated with submarine volcanism in an accretionary wedge setting.<\/p>

  Amphibolite metamorphism combined with prolonged dextral tectonic movement along the GRSZ has subjected these iron formations to multiple deformation phases. The Aspen Property hosts complexly folded silicate facies BIFs with narrow recrystallised chert bands interlayered with pelitic schists containing about 30% garnet, alongside darker mafic biotite schist bands. Banded sulfide units, including pyritic material, appear conformable with stratigraphy and have fold axes parallel to the GRSZ trend—a structural configuration considered prospective for mineralisation.<\/p>

  Historical Cominco Gold Discovery Along the GRSZ Trend Serves as Geological Analogue<\/h2>

  The report highlights a significant historical gold discovery by Cominco approximately 25 kilometres along the GRSZ trend southwest of the Aspen Property. This discovery was in silicate facies iron formation with similar garnetiferous pelitic units containing about 30% garnet (SMDI 3315), located near the southwestern boundary of the Pine Property.<\/p>

  This historical gold occurrence in geologically comparable host rocks near NHU’s tenements is a valuable reference point for investors. While it does not confirm economic mineralisation on NHU’s ground, it supports the geological rationale for systematic exploration along the same shear zone. The company has not disclosed any sampling or assay results from its own properties in this update.<\/p>

  Complex Structural Geology Across Four Domain Boundaries Shapes Woods Property<\/h2>

  Yeomans Geological describes the Woods Properties’ structural history as complex, reflecting tectonic events in the Rae Province during collisional emplacement. Four domain boundaries—Tantato, Beaverlodge, Train, and Dodge—are identified along the GRSZ, each contributing to the region’s multi-phase deformation. The GRSZ itself is a major, regional-scale, N72°E trending, sub-vertical fault zone marking the northwest margin of the Tantato Domain.<\/p>

  Dextral movement along the GRSZ caused the Beaverlodge Domain’s northeastern limit to be displaced into its final position along the shear zone. Large drag fold features related to this movement are visible via satellite imagery in topography and mapped Beaverlodge geology, especially near the Fir Property. This structural complexity, while challenging to interpret, aligns with geological architectures that commonly control mineralisation distribution in Precambrian terrains.<\/p>

  Rio Tinto’s Previous Exploration Along Bulyea Thrust and Ryckman Bay Shear Zones<\/h2>

  The report references prior exploration by Rio Tinto on structural features within or near NHU’s Woods Properties. Rio Tinto mapped and prospected the Beaverlodge-Train Domain Boundary on their Bulyea South claims, naming it the "Bulyea Thrust Zone," defined by arcuate lakes and streams forming a topographic low surrounded by granitoids in the central western Spruce Property.<\/p>

  Additionally, Rio Tinto conducted uranium exploration along the Train-Dodge Domain Boundary northwest of the Aspen Property, identifying a one-to-two-kilometre-wide curvilinear fault called the Ryckman Bay Shear Zone. The presence of major mining company work on and near NHU’s ground adds third-party validation of the region’s prospectivity, though the report does not disclose Rio Tinto’s specific findings.<\/p>

  Pegmatite and Lamprophyre Intrusions Enhance Geological Complexity<\/h2>

  The report also details various intrusive lithologies across the Woods Properties. Frequent late whitish-pink to pink leucogranitic and white-to-pink biotite pegmatite dykes occur near granitic intrusion margins, interpreted as anatectic melts of metapelites and partially melted granites. Lamprophyre dykes are reported along deep faults.<\/p>

  Notably, a pair of northwest-trending Mackenzie dykes dated at 1,268 million years crosscut the Aspen and Pine Properties, serving as a well-dated marker horizon to constrain structural and mineralisation timing. The presence of pegmatite systems is increasingly relevant given global interest in critical minerals like lithium, commonly hosted in pegmatites, although NHU has not disclosed any critical minerals focus in this update.<\/p>

  Proposed Structural Interpretation Adjustments at Train-Dodge-Tantato Domain Junction<\/h2>

  The report goes beyond summarising existing data by proposing refinements to geological mapping. Yeomans Geological suggests the current mapped location of the Train-Dodge-Tantato Domain triple junction on the southern Aspen Property is incorrect, particularly the depiction of sinistral movement along the GRSZ there.<\/p>

  The revised interpretation proposes the Train-Dodge boundary extends northeastward off the GRSZ along a major splay fault about three kilometres southwest of the current position. Such refinements can significantly influence exploration targeting, as accurate domain boundary and fault intersection locations are critical for identifying prospective zones. This recommendation is presented as a hypothesis rather than a definitive conclusion.<\/p>

  Key Considerations for NHU Investors as Woods Property Exploration Progresses<\/h2>

  The Yeomans Geological report release marks an important early milestone in NHU’s exploration story at the Woods Property. The outlined geological framework—featuring a major regional shear zone, banded iron formations, historical gold discoveries along the same trend, and complex multi-domain structural geology—provides a robust technical basis for systematic exploration. NHU has not provided details on work program schedules, budgets, or drilling commitments in this update.<\/p>

  The immediate impact on NHU’s share price was unclear from public sources. Investors evaluating NHU will be looking for announcements regarding planned fieldwork, geophysical surveys, sampling, or drilling to test the geological concepts presented. The next critical milestone will likely be the declaration of a detailed exploration program building upon the geological foundation established by the Yeomans Geological report.<\/p>