Noronex Launches Modern Exploration at Alaska Tin Deposit
Key Takeaways
- Noronex has commenced the first modern exploration at the Sleitat Tin-Tungsten-Silver Project in Alaska, with a high-resolution helicopter-borne magnetic and radiometric survey flying 250 line-km at 50-metre spacing — a step-change from historical government surveys flown at approximately one-mile spacing.
- Sleitat is one of only two US tin deposits identified by the USGS as likely to be economic, giving it rare strategic standing in domestic American critical minerals supply.
- The southern greisen zone (400m x 250m) has never been drilled, and the eastern margin of the northern zone remains entirely untested — meaning the majority of the known mineralised footprint is unexplored.
- Historical drill hole Cass 84-06 returned up to 29.1m at 1.56% Sn and 28 g/t Ag, including 3.1m at 12.55% Sn and 198 g/t Ag, establishing the grade quality that makes the untested zones compelling.
- A maiden JORC Exploration Target is targeted for Q4 2026, with first drilling planned for the 2027 field season subject to results, permitting, access, funding, and Board approval.
Noronex kicks off first modern exploration at Alaska’s Sleitat tin project
Noronex (ASX: NRX) has commenced its maiden modern exploration program at the Sleitat Tin-Tungsten-Silver Project in Alaska, USA, marking the first boots-on-ground activity at the site in 20 years under contemporary exploration methods. The program follows completion of due diligence, site visits, and historical data review since the acquisition was announced in July 2026. Acquisition of 100% of the project is expected to complete in September 2026, following a general meeting on 4 September 2026.
Sleitat carries significant strategic weight. It is one of only two US tin deposits identified by the United States Geological Survey (USGS) as likely to be economic, placing it in rare company for domestic American critical minerals supply.
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What’s happening on the ground right now
Two concurrent activities are now underway, launching this week and next week respectively.
The first activity, commencing this week, is a high-resolution helicopter-borne magnetic and radiometric survey being flown across the project by Precision GeoSurvey. Approximately 250 line-km of data is being acquired at 50-metre line spacing. To understand why this matters, historical government geophysical surveys were flown at approximately one-mile line spacing — meaning Noronex’s survey delivers a step-change in resolution, capturing geological detail that simply wasn’t visible before.
The second activity begins next week: an eight-day field program covering the known mineralised system and its potential extensions. Planned components include:
- Systematic surface rock sampling and assaying across the northern and southern greisen zones
- Sampling across the eastern edge of the exposed greisen and the prospective hornfels-covered margin
- Field checking and refinement of the existing geological map and interpreted granite-greisen-hornfels contacts
- Sampling for initial ore sorting and metallurgical test work
- Locating, resurveying, and marking identifiable historical drill collars
- Ground-truthing priority geological or structural features identified from the airborne survey
Additionally, Noronex plans to review 1,400m of historical drill core held at the Alaska Geologic Materials Center in Anchorage, integrating that data with the new geophysical, geological, and geochemical datasets. No geophysical results are reported in this announcement — the survey is underway, with results expected in approximately one month.
CEO quote
James Thompson, Chief Executive Officer
“This week we have commenced the first modern detailed geophysical survey across the Project, with magnetics and radiometrics being flown at 50-metre line spacing compared with approximately one-mile spacing in the historical government surveys. Our geological team will then be on the ground next week mapping, sampling and assaying the known mineralised system and, importantly, investigating its potential extensions.”
Understanding tin-greisen systems — and why Sleitat’s footprint matters
A greisen system forms when hot mineralised fluids from a cooling granite body chemically alter the surrounding rock, concentrating metals like tin, tungsten, and silver into sheet-like mineralised zones. Think of it as the granite “sweating out” its metal content as it cools, with that metal collecting in structured bands through the rock.
Sleitat hosts two distinct greisen zones. The northern zone measures approximately 900m x 300m and has been partially tested by historical drilling. The southern zone measures approximately 400m x 250m and has never been drilled. Historical drilling was also confined to part of the northern greisen, leaving the eastern under-cover margin entirely untested.
The key investor angle here is straightforward: the known mineralised footprint could be materially larger than what historical data captures, because the majority of the system has never been tested at all.
The quality of what has been drilled gives context. Historical drill hole Cass 84-06 returned up to 29.1m @ 1.56% Sn, 28 g/t Ag, including 3.1m @ 12.55% Sn, 198 g/t Ag from 20.4m (a historical result first reported 13 July 2026). These are the grades that made the northern zone worth drilling in the first place. The question now is whether similar mineralisation extends into the untested southern zone and eastern margin.
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Pathway to maiden drilling and what comes next
The purpose of the 2026 program is explicitly to build a “drill-ready three-dimensional interpretation” of the Sleitat mineralised system. The logical pathway forward runs in four stages:
- Current program (September 2026): Geophysical survey, eight-day field sampling, and historical core review — all designed to map the broader mineralised footprint beyond the partially drilled northern greisen.
- Integration and interpretation (October–November 2026): Assay results and new geological data are combined with the historical dataset to refine the geological model.
- Maiden JORC Exploration Target (Q4 2026): Targeted for release in Q4 2026, subject to the results of the work program. A JORC Exploration Target is a formal framework estimating the potential quantity and grade of mineralisation in an area — it is the step before a defined Mineral Resource.
- First drilling phase (2027 field season): Planned for the 2027 season, subject to the results of the 2026 program, permitting, access, funding, and final Board approval.
The central exploration question being tested is whether the southern greisen and the eastern under-cover margin extend the mineralised footprint materially beyond the historically drilled northern zone.
Sleitat is one of several active fronts for Noronex. The company also holds advanced Kalahari Copper Belt projects in Namibia and Botswana, where South32 earn-in agreements covering a combined A$20m are in place.
Key milestones to watch
| Milestone | Timeframe | What It Means | Status |
|---|---|---|---|
| Geophysical survey results | ~1 month from early September 2026 | Refines granite geometry and structural targets | Underway |
| Field sampling assay results | October–November 2026 | Identifies surface mineralisation extensions | Upcoming |
| Maiden JORC Exploration Target | Q4 2026 | First formal resource framework (subject to program results) | Targeted |
| Maiden drilling program | 2027 field season | Tests continuity and expansion of mineralisation | Planned (subject to results, permitting, access, funding, and Board approval) |
The coming months will tell investors whether the Sleitat system is as large as the untested southern and eastern zones suggest it could be. The geophysical survey results, expected within approximately one month, are the first material data point to watch.
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