CanAlaska Uranium Announces Extensive Uranium Mineralization at NE Wollaston Project

There is an extensive Table of individual assay results attached to this news release. In the Table the 2007 results are highlighted in bold. Individual zones are discussed as follows: 

Grevstad 2 (GR2)

The Grevstad 2 showings, shown in the attached map, cover an area, 750 m x 500 metres with predominantly intrusive hosted mineralization, with some pelites, but mostly as boulder trains. Uranium averages 0.2% U₃O₈, with a max of 0.8% U₃O₈. There are only two outcrop samples, one being at 0.18 % U₃O₈. Some of the results from long linear zones in the SE have previously been released (Nov 2006), but the new main zone shows disseminated pegmatitic boulders within multiple felsenmeer covered zones, over a 600 metre by 1,000 metre area. There is a constant association with Rare Earth mineralization (REE) of up to 0.9% in the granites and there is molybdenum mineralization associated with many of the samples. Of particular note is that uranium mineralization is found in ALL rock types, and most specifically in sediments. Elsewhere nearby, late stage cross cutting pitchblende stringers are also found in the sediments. There is extensive structural deformation in the area, and fracturing in the uranium rich pegmatites which is also expected to also occur in the adjacent sedimentary package.

NW Grevstad 2

This is a 3.5 km zone of mineralized white granite boulders discovered in the NW part of Grevstad 2 in 2007 and shown in the attached map. There is uranium mineralization with consistent REE mineralization associated with the white granites in this area, with above average uranium values in the sample distribution, as well as distinctly enriched molybdenum values. There are multiple target zones over 2,000 metres along a regular NE trend, all showing high REE and uranium. However, one zone to the south supports uranium values but no REE, so is probably indicative of another local source.

Grevstad 3

Mostly white granite and pegmatite with some pelites, with good uranium values and moderate REE enrichment. Some frost-heave and outcrops, with up to 0.56 % U₃O₈.

Grevstad 1

Scattered boulders and a few outcrops over an area of 9,000 metres x 3,000 metres, predominantly white granite boulders with values to 0.725%, U₃O₈, but with some pelites with 0.25% U₃O₈. The samples are variably enriched in REE, including an outcrop with 2.2 % REE. There is molybdenum in some samples.

Snyder 4

A significant area of Archean gneisses to meta-psammites with some white and pink granite and pegmatites. A large number of high grade boulders, generally associated with moderate to high REE enrichment in most samples, and very significant molybdenum values is shown in the attached map. There are two significant zones of uranium bearing outcrop, (and some pitchblende stringer mineralization, which was identified in the 1970’s on nearby Hook Lake zone, where mineralization in outcrop and boulders is of the same type, but lower grade.) The surface exploration by CanAlaska crews in 2006 and 2007 has now identified separate mineralized boulder trains with high grade uranium values in an area 2,000 metres x 1,500 metres, located further to the east of historical exploration. Airborne survey information for this area identifies a number of structural and stratigraphic targets.

Snyder 12

High uranium values to over 3.0% U₃O₈ with a very strong association with rich REE, mostly in the mixed granite rocks, the average REE/U = 4. There are three probable source areas, over a 2,000 metre x 3,000 metre area, as indicated by the dispersion patterns shown in the attached map. The boulders are mostly pink and white granite, some calcsilicates with up to 3.3 % U₃O₈ in calcsilicate.

Snyder 13/15 

Mostly pink and white granite boulders over a 5,000 metre trend, some calcsilicates, with up to 1.15% U₃O₈, and slight enrichment in molybdenum and up to 1% REE.

Snyder 7

White pegmatite and granite boulders, and frost heave samples from a newly discovered area. There is little uranium to go with the radioactivity noted. Most of the radioactivity is due to Thorium. There is highly anomalous REE mineralization, in the 0.6 to 8.6 % range.

Snyder 4 -Hook Lake-Island

A further area of Archean gneisses to meta-psammites with some white and pink granite and pegmatites. A large number of high grade boulders and some outcrops, generally associated with moderate REE enrichment in most samples, and very significant molybdenum values (see the attached map of the souther part of the zone). The mineralized samples average 0.64% U₃O₈, (0.38% U₃O₈ on outcrop) with a maximum of 3.6% U₃O₈. U/Th ratio is 8, molybdenum is occasionally high (up to 2.7% Mo), REE and phosphate are slightly enriched. This area was previously drill tested by Amax in the 1970-80’s, but only locally, and with limited success.Hara 4 
An area of white granite and pegmatites, relatively poor in uranium, but enriched in thorium and high in REE (up to 1.4%). Further work is required.Snyder Island

A smaller 100m long area of calcsilicates with some white granite. The mineralization is in boulders and outcrop as pegmatoid calcsilicates and as late cross cutting veins (massive pitchblende and calcite). The uranium averages 0.6%U₃O₈, excluding one sample of pitchblende recovered from weathered vein material which assayed at 56% U₃O₈. The U/Th ratio is 8.6 and there is some REE enrichment.

A 5,000 metre zone of varied lithologies of quartzites, psammites, pelites, calcsilicates and white granite. The uranium averages 0.76% U₃O₈, with a max of 2.8% U₃O₈. The U/Th ratio is 13, and there is minor molybdenum enrichment. One of the high grade samples has been described as coming from a shear zone. This showing is the original showing from the 1970-80’s work, and there are early reports of 6% U₃O₈ boulders combined with a very high lake sediment sample (100+ ppm U)

VD-Mag

An interesting 3,000 metre, east-west trending target area, this mineralization was newly-discovered in 2007. The mineralization is mostly boulders of white granite with quartz veins and one outcrop of uranium mineralized calc-silicates. The best mineralized boulders assay to 1.4% U₃O₈, some samples have moderate REE enrichment.

Maguire Mag

This is a broad area along the NE shore of Maguire Lake with mostly pink granite and pegmatite, but with some calc-silicates and a quartzite. Uranium values are up to 1.6% U₃O₈. One sample is anomalous as it is a white granite sample low in uranium, but with 2.5% REE.

The following three zones were previously released:

U-Th-1 (Oct 2, 2006)
A previously reported zone of uranium enrichment, mostly in boulder trains. The newly reported samples on this 9,000 x 3,000 metre zone, discovered in 2006, are mostly from the southern extension of the zone. The samples are mostly white granite and pegmatite with some pelites. There is minor REE enrichment.

Pitchblende Ridge (Nov. 1, 2007)
This area was previously reported. It is predominantly boulders of calcsilicate with a range of mafic poor to mafic rich. The uranium average is 1.1% U₃O₈, with a maximum of 17% U₃O₈. These are mostly boulders, but frost-heave samples at 9.08 % U₃O₈ with outcrops at 3.72% and 1.91 % U₃O₈. There is low REE, but some high P2O5 (max 13%). There are two groups of samples: “pitchblende nodules” above 2% U₃O₈ and the remainder below 2% with a cubic radioactive mineral disseminated or along laminae. The setting is a low resistivity “structural” conductor, and graphite is present in some samples.

Crazy Train (Aug 23, 2007)
This area was previously reported, and is exclusively boulders of intrusive rock, mainly white granite with strong alteration of alkali feldspar and apatite, producing rocks composed exclusively of feldspar and apatite.

The U₃O₈ averages 0.39% with a maximum of 1.24 % U₃O₈. Thorium and molybdenum are very low, but there is high phosphate (P2O5, average 9.7%). There is enriched in REE (max 6.3%) and Yttrium, with a LREE/HREE ratio of 3.