Cluff Lake Properties (Bridle & Middle Lakes)

The Cluff Lake properties adjoin the former Cluff Lake Mine site, where over 62 million pounds of U3O8 were extracted during a 22-year operating life through a combination of three open pit mines and four underground mines operated by predecessors of Orano Canada Inc. ( The Cluff Lake properties include two projects located within the Carswell impact structure at the end of Provincial Highway 955:

  • Bridle Lake is comprised of 2 claims totaling 6,797 hectares and is owned 50% by ALX and 50% by Rio Tinto Exploration Canada;
  • Middle Lake is comprised of 3 claims totaling 4,832 hectares and is owned 80% by ALX and 20% by Matthew J. Mason.

On November 9, 2021, ALX announced a transaction with Okapi Resources Ltd. ("Okapi") of Perth, Australia, where Okapi can purchase ALX's interest in Middle Lake as part of a six-property transaction. Okapi is engaged in a 60-day due diligence period on the six properties that began on November 4, 2021.


Bridle Lake: Drilling in 1979 by Amok Ltd. intersected 0.112% U3O8 from 17.2 to 18.7 metres (CAR 316A) and 0.12% U3O8 from 52.6 to 53.0 metres (CAR 278).

Middle Lake: Recent exploration has targeted VTEM, gravity and radon targets. The targets are located in the up-ice direction of historic high-grade boulder trains with grades of up to 16.9% U3O8.

Proximity to Uranium Discoveries, Deposits, Mills and Mines

  • Adjacent to the past-producing Cluff Lake uranium mine (1981 – 2002)
  • 75 km (approx.) north of Triple R (Patterson Lake South) uranium deposit
  • 10 km (approx.) north of Shea Creek uranium deposit

Exploration by ALX and Predecessors


JANUARY – FEBRUARY: MWH Geo-Surveys Ltd. was contracted by Alpha Exploration (a predecessor to ALX Uranium Corp.) to carry out a ground gravity survey on three grids at Middle Lake (see Alpha news release dated January 20, 2014).

FEBRUARY: A 20 hole, 2,000 m diamond drill program was designed to test the gravity, radon, helium, geochemical, and magnetic anomalies and VTEM conductors identified on the property. The drilling was carried out from mid-February to mid-March and was extended to 3,287 m in 31 holes to better assess encouraging alteration and anomalous radioactivity encountered in what is now termed the Donna Zone, immediately west of Skull Lake (see Alpha news release dated April 1, 2014).


JANUARY – FEBRUARY: The 2015 diamond drilling program consisted of 1,850 metres in 17 drill holes, and was a continuation of diamond drilling program in 2014. Drilling in 2015 was focused on geophysical features in the northern part of the property, around Skull Lake; integrated targets based on gravity, electromagnetic and magnetic features were tested. (see Alpha news release dated March 10, 2015).

Geophysical targets were corroborated by drilling. Conductors intersected west and north of Skull Lake are related to sulfide-bearing graphitic shear zones in psammitic gneiss with pegmatite in contact with Archean Earl River gneiss complexes. Farther to the west, a large gravity low anomaly was explained by the presence of abundant Cluff Lake impact breccia containing local graphitic shear zones.