Uranium exploration in the vicinity of the Hook-Carter property has been reported since 1969. Historically speaking, the region surrounding and including the current property has received exploration from a large number of companies. There have been several major conductive trends found on the Hook-Carter property and neighbouring properties, including the Carter, Derkson and Patterson Lake conductors. Details of exploration with significant results in the area that cover a portion of the current Hook-Carter 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 in sandstone boulders was also observed. In 1997, UEM Inc. and Cameco completed Fixed Loop Time-Domain Electromagnetic (FLTEM) and discovered 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-Carter claims were drill tested in 1999 by Cameco Corporation 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.
The northern portion of the Hook Lake area was explored by 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.
Between 2005 and 2007, ALX's predecessor company, ESO Uranium Corp., carried out airborne EM surveys, ground resistivity and diamond drilling. The PIMA (infra-red spectroscopy) analyses performed on drill core from the 2007 drilling were re-evaluated in 2013. This work identified important 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. ALX believes follow-up drilling is warranted.
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 provided important gravity and magnetic data for integration with known geology and drill hole information.
An obvious feature is a sinuous magnetic low seen trending southwest-northeast through the centre of the entire survey 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 associated faults. 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 cross-cutting 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.
Targets developed from recent airborne, and ground EM and resistivity surveys have not yet been drill tested.