Hook-Carter Property

The Hook-Carter property covers the northeastern end of the Derkson, Carter and Patterson Lake structural and conductor trends, host to numerous uranium showings, deposits and recent discoveries, including the Triple R (Patterson Lake South) deposit as well as the Arrow and Spitfire discoveries. The overall potential of the Hook-Carter property is to further pursue high-grade uranium mineralization in this emerging uranium district in the southwestern Athabasca Basin.


  • Three prospective conductive corridors transect the property.
  • Several drill-ready targets based on historic and recent exploration


  • Southwestern portion of the Athabasca Basin, northern Saskatchewan near Highway 955
  • Proximity to Uranium Discoveries, Deposits, Mills and Mines 75 km south to southeast from the former Cluff Lake uranium mine
  • 20 km (approx.) northeast of the Triple R (Patterson Lake South) uranium deposit
  • 13 km (approx.) northeast of NexGen’s Arrow discovery
  • 8 km (approx.) northeast of Cameco/AREVA/Purepoint’s Spitfire discovery

Property Description and Ownership

  • Hook-Carter consists of 19,573 hectares in 38 claims
  • ALX owns a 20% interest after the 2016 sale of an 80% interest to Denison Mines Corp. for 7.5 million common shares of Denison (valued at $4.5 million on closing of the transaction in November 2016)
  • Denison, as operator, has agreed to fund the first $12.0 million in exploration expenditures – geophysical work was carried out in 2017, drilling is planned in winter of 2018

Historical Exploration

CGG Aviation (Australia) Pty Ltd. of West Perth, Australia completed a FALCON® airborne gravity gradiometer gravity survey in late 2014, which included magnetic and laser scanning digital elevation components: 987 line-km flown at 200-metre line spacing covering a grid area of approximately 10 x 14 km (see ALX news release dated March 12, 2015).

The survey showed the magnetic signature is relatively smooth indicating deep sources, and a generally increasing depth to source going northward. This is consistent with non‐magnetic sediments overlying magnetic basement rocks within a basin which is generally deepening to the north. Drill hole data collected in the area is consistent with this observation. Image processing of the magnetic data helps bring out some less obvious details in the data. An obvious feature is the somewhat sinuous low seen trending southwest-northeast through the centre of the entire block. This is roughly coincident with a mapped fault on Government of Saskatchewan 1:250,000 maps and also with the Derkson corridor. This magnetic signature will allow more precise definition of the location of the corridor and fault. In addition, some of the direction changes in the corridor appear to be related to breaks in the magnetic material to the southeast, which may represent crosscutting faults or shears. In other areas, the magnetics can similarly be used to refine locations of inferred corridors. The western edge of the block shows a higher magnetic intensity in general than the rest of the block, perhaps suggesting a lithology change in the basement.

The FALCON® gravity gradiometry gD response is seen to be highest in the southern portion of the Hook Lake area, and lowest to the northwest. There is a marked boundary between low and high across the location of the Derkson corridor, particularly in the north end of the block. Overall the response appears to reflect the varying depth of the unconformity and thickness of the sedimentary package. A thicker low density sediment package on top of higher density basement rocks results in a gD low. The change in gD suggests vertical motion along the Derkson corridor, with the basin being deeper on the northwest side of the corridor. Drill hole information is consistent with this interpretation.

Uranium exploration in the vicinity of the Hook Lake property has been reported since 1969. The region surrounding and including the current property has had a myriad of companies and surveys completed and reported since 1969. There have been several major conductive trends found on the property, including the Carter, Derkson and Patterson Lake conductors. Details of exploration with significant results in the area that cover a portion of the current property are as follows:

In 1996, Uranerz Exploration and Mining discovered, through boulder sampling, that the area north of Derkson Lake to Carter Lake and along the Williams River was geochemically anomalous with elevated boron (dravite), kaolinite and chlorite content.

An east-flanking zone of strong illitization was also observed. In 1997, UEM and Cameco completed Fixed Loop Time-Domain Electromagnetic (FLTEM) discovering several conductive trends, and follow-up boulder sampling was carried out. In 1998, the same companies completed additional ground EM surveys and a larger airborne GEOTEM survey.

Certain of the Hook Lake claims were drill tested in 1999 with four drill holes, again in 2001 with one drill hole and in 2003 with one drill hole.

Several holes displayed criteria favourable to unconformity uranium deposits with anomalous clay alteration, quartz dissolution, Athabasca Group and basement structure and/or anomalous geochemical enrichment. Between 2005 and 2007, ALX Uranium's predecessor, ESO Uranium, conducted exploration including airborne EM surveys, ground resistivity and diamond drilling. The PIMA analyses performed on drill core in 2007 were re-evaluated in 2013. This work identified clay alteration minerals including sudoite (chlorite), dravite, smectite/illite, sericite, and probable carbonate. In addition, anomalous values of pathfinder elements including nickel, copper, silver, tungsten, and mercury were found in certain samples in Athabasca sandstone, which along with the dissolution and silicification noted in drill logs provide evidence of hydrothermal alteration along the northern end of the Derkson corridor. Follow-up drilling along the corridor is warranted.

The northern portion of the Hook Lake area was explored by the Nexgen Energy Corp. predecessor, Dejour Enterprises Ltd. and Titan Uranium Inc., between 2005 and 2010 with airborne EM, ground Fixed Loop EM, Moving Loop EM and DC Resistivity surveys.

Two drill holes in 2006 tested historical conductors. The recent ground EM and resistivity surveys have not yet been drill tested.