District Metals has intersected up to 198.3 metres of cumulative alum shale in new drilling at its Viken project in central Sweden, strengthening the potential for expanding a major uranium-vanadium and polymetallic mineral system.
The Canadian exploration company reported results from four diamond drill holes at Target A in Jämtland County. The findings confirm that graphitic alum-shale formations extend beyond the boundaries of the existing mineral deposit, although laboratory assays are still needed to establish uranium and other metal grades.
The exploration results come as Sweden reopens its uranium mining industry and District advances a project supported by a preliminary economic assessment estimating an after-tax net present value of approximately €2.57 billion. This valuation relates to the previously defined deposit and excludes any additional resources from the latest drilling.
Four Drill Holes Reveal Extensive Alum Shale Formations
Hole VIK-26-005 intersected 198.3 metres of cumulative alum shale between down-hole depths of 24 and 274.1 metres, including a principal continuous interval of 196 metres.
The other holes returned 177.1 metres in VIK-26-004, 82 metres in VIK-26-002 and 73 metres in VIK-26-003. The intersections consist of strongly graphitic black shale, consistent with the geological formations previously identified at Viken.
Handheld scintillometer measurements recorded elevated radioactivity, with readings reaching 750 counts per second in some intervals. These measurements do not establish uranium grades, which must be confirmed through laboratory analysis. The reported intervals represent down-hole measurements rather than confirmed true mineralised thicknesses.
Geological Structures Could Support Resource Expansion
The drilling indicates that individual alum-shale sequences, typically around 5 to 20 metres thick, may have been structurally repeated through folding and deformation.
This process can create substantially thicker cumulative shale intervals, potentially offering advantages for future mine planning if consistent grades and suitable geological conditions are confirmed. Structural complexity can also affect extraction methods, ground stability and dilution.
The company must therefore establish the actual thickness, continuity and metal content of the formations before incorporating them into a future mineral resource estimate.
Geophysical Surveys Guide Further Exploration
The drilling programme tested conductive anomalies identified through a 2025 MobileMT airborne geophysical survey.
The technology identifies electromagnetic responses associated with underground geological formations, helping explorers locate potential graphitic shale zones.
All four new holes encountered substantial alum-shale sequences, supporting the interpretation of the geophysical data. District plans to continue exploration across Targets A and B to investigate additional mineralisation and improve geological understanding beyond the existing Viken deposit.
Viken Project Has a €2.57 Billion Preliminary Valuation
District Metals’ flagship Viken project contains uranium and vanadium alongside other potentially valuable materials, including molybdenum, nickel and potash-related products.
An independent preliminary economic assessment estimated an after-tax NPV of approximately €2.57 billion, based on an 8% discount rate.
The study outlined initial capital expenditure of approximately €781 million, an internal rate of return of 45.9% and a projected payback period of 2.1 years.
The proposed mine was modelled over 13 years, with average annual production of approximately:
- 3.3 million pounds of uranium oxide
- 16 million pounds of vanadium pentoxide
- 250,000 tonnes of sulphate of potash
These figures represent preliminary economic projections rather than approved production commitments.
The assessment also relies partly on Inferred resources, which account for approximately 23% of planned processing feed. No final investment decision or corresponding construction financing has been announced.
Processing Technology and Multiple Metal Recovery Remain Critical
Viken’s development concept depends on recovering several commodities from large volumes of alum shale. The economic performance of the proposed operation will therefore depend on metallurgical recoveries, processing costs, reagent consumption, waste management and the ability to produce marketable materials.
Revenue from uranium, vanadium and other potential products is an important part of the preliminary economic model.
The latest drilling could expand the geological footprint of the project, but additional shale thickness does not automatically translate into improved economics. Laboratory assays and metallurgical testing will determine its commercial significance.
Sweden’s Uranium Policy Creates New Development Opportunities
Sweden reopened the possibility of domestic uranium extraction effective 2026, reversing the prohibition introduced in 2018.
Alum-shale mining faces additional regulatory considerations. A separate government inquiry is examining whether municipal approval requirements should apply to exploitation concessions involving these formations.
For Viken, the regulatory outcome could influence permitting procedures, local authority involvement and the development timetable. Environmental approvals will also need to address groundwater protection, radioactive materials, waste management, land rehabilitation and long-term environmental impacts.
European Demand Supports Strategic Interest
Viken could contribute to European supplies of uranium and vanadium, two materials with important industrial and energy applications.
Uranium supports nuclear power generation, while vanadium is used in steel alloys and vanadium redox-flow batteries designed for stationary energy storage. Commercial development will require reliable processing infrastructure, competitive production costs and agreements with downstream customers.
The next important milestones are laboratory assay results, additional drilling at Targets A and B and further evaluation of the newly identified shale formations. District Metals has strengthened the geological case for expanding its Viken project, but the commercial potential will depend on confirming metal grades, establishing additional resources and securing the necessary environmental and regulatory approvals.
The post District Metals Intersects Thick Alum Shale Zones at Swedish Viken Uranium Project appeared first on Mining South East Europe.