Overview
Targeting a McArthur River-Style Uranium System in the Athabasca Basin
Appia’s Otherside Uranium Property is a highly prospective project strategically staked on top of a ~49 km long electromagnetic (EM) conductor with significant potential for uranium mineralization. The unique structural bends/breaks within the property’s EM conductor are considered comparable in style to characteristics associated with Cameco’s McArthur River high-grade uranium deposit, as well as other major Athabasca Basin uranium discoveries such as NexGen’s “Arrow” deposit, UEC/Orano’s “Shea Creek” deposit, and more.
Appia’s Otherside Uranium Property spans 15,146 hectares across 6 claims in northern Saskatchewan and is 100% owned by Appia. The property covers a highly prospective corridor where historical operators including Strathmore Minerals Corp. and Fission Uranium Corp. completed exploration between 2005–2010, confirming strong uranium exploration potential.
To date, Appia has advanced evaluation of the Otherside Uranium Property through several magnetic and electromagnetic geophysical surveys, which have helped define key geological features and identify priority target areas. More recently, interpretation of the airborne gravity and magnetic survey, together with the ground magnetotelluric (MT) survey, has outlined multiple high priority targets that are supporting a planned 2026 -2027 drill campaign aimed at unlocking Otherside’s uranium potential.
Project Location
Appia’s properties in the Athabasca Basin
Location
The Otherside property presents an opportunity for mineral exploration within the north-central Athabasca Basin. Situated approximately 28 kilometres south of Fond-du-Lac village, this strategically positioned property offers prime access to this renowned mining region.
Coordinates
Central Coordinates:
Using the UTM NAD83, Zone 13N coordinate system, the central coordinates of the Otherside property are approximately 356,250 metres east and 6,540,050 metres north. (Figure 1)
Exploration and Development:
With its favourable location and precise coordinates, the Otherside property provides a strong foundation for Appia’s exploration and development initiatives.
Targeting a McArthur River-Style Uranium System
Appia’s 2026 SPARTAN MT survey identified several exploration vectors within Otherside’s primary corridor that are comparable to the ingress/egress-style structural setting of McArthur River’s high-grade uranium deposit. Line 2 has emerged as Otherside’s highest-priority corridor, leading to the identification of drill targets P-09, P-09A and P-10 to test this high-potential setting.
McArthur River: A Benchmark Athabasca Basin Deposit:
McArthur River is a world-class Athabasca Basin uranium deposit with total mineral reserves of approximately 346.5 million pounds U3O8 at 6.48% U3O8. Mineralization is associated with the P2 North conductor and P2N Thrust Fault, where structural disruption and hydrothermal alteration created pathways and traps for uranium-bearing fluids. (Source: “Cameco Mineral Reserves and Resources, as of December 31, 2025.”)
Similarities to Appia’s Otherside Uranium Property:
Several geophysical and structural indicators associated with the McArthur River uranium deposit have also been identified at Otherside through Appia’s airborne gravity, magnetic and ground MT surveys. These shared exploration vectors include:
- A major break and offset in the main EM conductor;
- A deep and wide conductive basement structure rooted to more than 3-kilometers depth;
- 2+ interpreted faults that may have provided pathways for hydrothermal fluids;
- An approximately 100-meter offset at the interpreted unconformity; and
- Chimney-like density responses extending into the sandstone.
Together, these features are interpreted as potential fluid-pathway and structural-trap architecture comparable in concept to the ingress/egress-style setting at the McArthur River uranium deposit.
Priority Drill Targets:
Targets P-09, P-09A and P-10 are positioned within the central conductor break and represent Appia’s highest-priority targets for testing a potential McArthur River-style uranium setting.
Further tight-spaced MT surveying and high-resolution 3D modelling are planned to improve the definition of the conductor geometry, interpreted faults and unconformity offset before drill testing.
Additional Athabasca Basin Comparisons:
Otherside also shows geophysical similarities to major uranium systems in the region, including deposits such as:
- “Arrow” – NexGen Energy Ltd.
- “Shea Creek” – Uranium Energy Corporation (UEC) & Orano Group
- “Millenium”: Cameco.
- “Phoenix”: Denison Mines Corp.
with shared exploration vectors to these proven uranium deposits, such as:
- Gravity lows, which can reflect hydrothermal alteration;
- Magnetic lows, which may indicate alteration and/or structural preparation; and
- EM conductors, particularly where they are bent, segmented, or faulted.
Together, these geophysical similarities strengthen Otherside’s exploration potential and provide a clear foundation for Appia’s focused target refinement and planned diamond drilling program in 2026-2027.
Comparison of Appia’s Otherside Uranium Property to Cameco’s Millennium deposit.
Similar regional geophysical trend with known uranium deposits
2026-2027 EXPLORATION PLAN
Following completion of the initial 2026 SPARTAN MT survey, Appia plans to further refine Line 2 and its priority drill targets through high-resolution 3D surveying and integrated data analysis, followed by precision diamond drilling to test the area’s potential to host high-grade uranium mineralization.
High-Resolution Infill MT Survey
Complete a tight-spaced ground MT survey around targets P-09, P-09A and P-10 to improve the definition of the main conductor break, interpreted faults and unconformity offset at the potential McArthur River style setting at Line 2.
High-Resolution 3D Modelling
Integrate the MT, airborne gravity, magnetic, ZTEM and VTEM datasets into a high-resolution 3D model. The model will refine the geometry of the Line 2 targets and identify any additional targets that may emerge from the combined interpretation.
Diamond Drilling
Execute a diamond drilling campaign during the 2026-2027 program to test the highest-priority targets for potential high-grade uranium mineralization.
Program Logistics and Community Collaboration
Continue staging field operations from Fond du Lac, Saskatchewan, while maintaining and strengthening collaboration with local First Nations and Athabasca Basin communities.
Partnership and Funding
Appia will continue evaluating potential strategic partnerships and funding opportunities that could accelerate exploration at Otherside.
Proposed 3D high-res magnetotellurics (MT) survey at Appia’s Otherside Uranium Property.