One block, 8,106 hectares, 100% owned
Dieter Lake sits in the Gayot Lake basin of North-Central Quebec, where uranium mineral exploration is permitted. The 168 map-designated claims form a single contiguous block, and UraniumX holds a 100% interest.
Ownership
UraniumX acquired a 100% interest in Dieter Lake from Consolidated Uranium Inc., a wholly owned subsidiary of IsoEnergy Ltd. (TSX: ISO) (NYSE American: ISOU), in a transaction completed effective August 19, 2026. IsoEnergy is now a strategic shareholder in UraniumX. Transaction terms are set out in the news releases dated July 10, 2026 and August 20, 2026.
IsoEnergy’s shareholding is consideration for the sale of the project; it is an equity investment and is not an endorsement of any UraniumX exploration result.
Geological setting
Uranium mineralization occurs as fine-grained pitchblende within a stratabound shale-wacke horizon of the Sakami Formation, traced over approximately 6 km of strike in four zones (Vivian, Nancy I and II, and Bert’s) that remain open to the southwest.
24.4 million pounds U3O8, estimated in 2006
The estimate is a historical one. It gives the scale of mineralization identified to date on the property and defines the work UraniumX must do to verify it under National Instrument 43-101.
- Tonnage
- 19.3 million tonnes
- Grade
- 0.057% U3O8 average
- Contained
- Approximately 24.4 million pounds U3O8
- Date
- 2006
- Method
- Thiessen (Voronoi) polygons; data constraints of 200 ppm, 500 ppm and 1,000 ppm U3O8 over a minimum thickness of 1 metre; polygon radii of 200 metres; rock density of 2.67 g/cm3
- Reported by
- Fission Energy Corp., “Technical Report on the Dieter Lake Property, Quebec, Canada”, October 7, 2011; prepared by Davis & Guo
- CIM category
- None applies. Not prepared using the mineral resource categories of the CIM Definition Standards (2014)
- Newer data
- 2025 heliborne magnetic survey and 2023 alteration-mineral study, in each case as disclosed by IsoEnergy
The property hosts a historical mineral resource estimate of 19.3 million tonnes at an average grade of 0.057% U3O8, containing approximately 24.4 million pounds U3O8. The estimate is dated 2006 and was reported by Fission Energy Corp. in "Technical Report on the Dieter Lake Property, Quebec, Canada" dated October 7, 2011. It was prepared by Davis & Guo using the Thiessen (Voronoi) polygon method, applying data constraints of 200 ppm, 500 ppm and 1,000 ppm U3O8 over a minimum thickness of 1 metre, polygons with radii of 200 metres, and a rock density of 2.67 g/cm3.
A qualified person has not done sufficient work to classify the historical estimate as a current mineral resource, UraniumX is not treating it as current, and it should not be relied upon. Verification as a current mineral resource would require, among other things, data verification and confirmation drilling. The Company has not independently verified the historical estimate.
The Company considers the historical estimate relevant as an indication of the scale of the uranium mineralization identified to date on the property, and considers it reliable in that it was prepared by professional geologists using methods standard at the time and was reported in a technical report prepared for a reporting issuer. There is no assurance that further exploration will result in the definition of a current mineral resource.
Historical estimate, method and provenance per the UraniumX news release dated August 20, 2026 and Davis & Guo, “Technical Report on the Dieter Lake Property, Quebec, Canada”, October 7, 2011, filed under Fission Energy Corp.’s profile on SEDAR+. The 2025 heliborne magnetic survey and 2023 alteration-mineral study are as disclosed by IsoEnergy; the Company’s qualified person has not verified that information.
Open to the southwest, and largely untested by modern drilling
The historical estimate covers what past operators drilled. The remaining ground, the open strike and the modern survey targets are where new information comes from.
The mineralized horizon is traced through Vivian, Nancy I and II, and Bert’s, and remains open to the southwest.
A 2025 heliborne magnetic survey and a 2023 alteration-mineral study generated additional untested targets. The majority of the 8,106-hectare property has seen little or no modern drilling.
Data verification and confirmation drilling, including twinning of historical drill holes, then a new technical report under National Instrument 43-101. Dahrouge Geological Consulting Ltd. is preparing the updated report, and the Company expects to provide a further update in due course.
“Our near-term work at Dieter Lake is straightforward: verify the historical database and drill to test it.”Esen Boldkhuu, Chief Executive Officer, news release of August 20, 2026
Figures per the UraniumX news releases dated July 10, 2026 and August 20, 2026. Claim count, property area and historical exploration information are derived from the 2011 technical report and from IsoEnergy’s disclosure regarding the project. Statements about planned verification work and the technical report are forward-looking; see the disclaimers below.
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Read the deck →Related News
UraniumX Completes Acquisition of the Dieter Lake Uranium Project; IsoEnergy Becomes Strategic Shareholder
The acquisition of a 100% interest in Dieter Lake closed effective August 19, 2026, and IsoEnergy became a strategic shareholder in UraniumX. UraniumX now holds uranium projects in two Canadian jurisdictions.
Read Full Release →IsoEnergy to Become Strategic Shareholder of UraniumX as Company Agrees to Acquire Dieter Lake Uranium Project
UraniumX agrees to acquire a 100% interest in the Dieter Lake uranium project in North-Central Quebec, host to a 2006 historical estimate of approximately 24.4 million pounds U3O8 (not a current mineral resource), with IsoEnergy to become a strategic shareholder on closing. Transaction terms are in the release.
Read Full Release →The scientific and technical information on this page is derived from the Company's news releases dated July 10, 2026 and August 20, 2026, reviewed and approved by the Company's Qualified Person under National Instrument 43-101, and from the historical technical report referenced above. The Dieter Lake historical estimate is not a current mineral resource and should not be relied upon. See site footer for full forward-looking, mineral resource, adjacent property, and US investor disclaimers.