Toronto Stock Exchange (TSX): CVV

VANCOUVER , June 19, 2012 /CNW/ - CanAlaska Uranium Ltd. (TSX - CVV) ("CanAlaska" or the "Company") is pleased to announce assay and trace element geochemistry results for the Grid 5 winter drilling program at its West McArthur project, a 50/50 joint venture between the Company and MC Resources Canada Ltd., a subsidiary of Japan's Mitsubishi Corporation (See also News Release - April 13 th, 2012). The seven drill holes completed during the program, comprising total drilling of 6,421.5 metres, tested targets along six kilometres of conductive trends located immediately SW of the new uranium discovery at Read Lake (See Cameco's website description of its Read Lake project and Saskatchewan Geological Assessment Report #74H-0065).

For maps click here: http://www.canalaska.com/s/News.asp?ReportID=531725

Drill holes WMA028 and WMA034 produced very positive results for uranium. Both intersected parts of a highly-altered graphitic pelite unit and are thought to be within 50 metres of the targeted conductor, which was identified from the down-hole geophysical surveys.

The targets generated at the eastern end of Grid 5 matched and extended a historical conductor, which was drill-tested by Uranerz in 1989. Neither of the two historical drill holes intersected their targeted basement conductor, but, significantly, contained dravite clay and pyrite along with narrow, steep, clay rich fault gouges/breccia in the top 350-400 metres of the sandstone column. In one historical hole, the upper 400 metres of sandstone showed anomalous uranium and trace elements. Drill holes WMA028 and WMA034 are located in this area. Both show deep alteration into the basement rocks, indicating and confirming a substantial hydrothermal alteration system.

Drill hole WMA028 intersected a series of fracture zones and faults between 80 metres and 335 metres above the unconformity, and a geochemical halo (U, As, Ni)reaching 23 metres above the unconformity In drill hole WMA034, the geochemical halo extended 360 metres above the unconformity (U, B, As, Ni, Cu in the first 125 metres, followed by As only for the next 235 metres). Below the unconformity, WMA028 and WMA034 intercepted multiple graphitic pelites and semi-pelites, with up to 35% disseminated graphite, as well as graphite-rich breccia zones with up to 60% graphite in the matrix. The borehole EM surveys indicate that neither of these holes intercepted the main conductor on which they were targeted.

Drill hole WMA028 (see Figure 2) shows a series of fracture zones and faults from 450 metres to 730 metres down-hole, associated with hydrothermal bleaching. The last 25 metres of sandstone are enriched in uranium, arsenic and nickel associated with Mg-chlorite and sudoite alteration. The basement rocks are clay altered. A radioactive peak of 1,220 cps (counts per second) in probing at 786.55 metres corresponds to one metre at 0.014 % U3O8, associated with anomalous nickel, arsenic, cobalt, copper, and gold values (see table). A radioactive peak of 1,165 cps occurs at 790.4 metres. This assayed 0.030 % U3O8 over 0.5 metres. The borehole EM survey indicates that any follow-up drilling should target the main graphitic unit which is imaged just to the south of the intersection.

Drill hole WMA034 (see Figure 3) has a strong geochemical halo combining uranium, nickel copper, and arsenic which reaches 360 metres above the unconformity. It also shows stronger hydrothermal alteration signature in the last 20 metres of sandstone, but less structural disturbance than drill hole WMA028. The strong geochemical halo at the base of the sandstone is associated with bleaching, disseminated and sooty pyrite and faulting.

The basement rocks in drill hole WMA034 contain graphitic pelites, but the borehole EM survey indicates the target is 50 metres north of the drill hole. A radioactive peak just below the unconformity corresponds to 0.5 metres at 0.013 % U3O8 in a six metre zone of metal enrichment (nickel, arsenic, cobalt, and copper) starting immediately below the unconformity. There is a 6-metre zone of graphitic breccia with multiple fracture events from 929.3 to 935.3 metres and clay (kaolinite) alteration to the bottom of the hole.

Table 1: Selected Assay Results

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Drill Hole Chemistry at West McArthur Project Enhances Uranium Target