GREAT WESTERN DIAMONDS CORP.
TSX VENTURE : GWD

GREAT WESTERN DIAMONDS CORP.

January 24, 2007 12:56 ET

Great Western Diamonds Corp.: Diamond Results From the 2006 Candle Lake C28 Kimberlite Program

SASKATOON, SASKATCHEWAN--(CCNMatthews - Jan. 24, 2007) - Great Western Diamonds Corp. (TSX VENTURE:GWD) ("the Company") is pleased to announce the results of diamond recoveries from the drilling program on Kimberlite C28 completed during the first quarter of 2006 (see April 6/06 News Release). The nine drillhole program intersected a total of 612.6 m of kimberlite in 8 of the NQ size (47.6 mm diameter) core holes. The drillholes were positioned from 25 to 100 m apart in order to test the south-central part of the body in detail and to acquire representative samples from areas not previously drilled. The thickest kimberlite intersections (up to 120.85 metres) were encountered near the center of the body (e.g. DDH CL28-06-19). All core was logged in detail by Mineral Services Canada Inc. who then selected intervals for diamond recovery based on kimberlite lithology (three major units), minimization of potential sampling bias, and maximum representivity of material.

A total of 178 samples from 436.1 m of core totaling 1,643.34 kg (Table 1) were submitted to the Saskatchewan Research Council (SRC) for diamond recovery utilizing caustic dissolution methods. The SRC recovered and reported diamonds down to a lower cutoff of 0.106 millimetres in size. A total of 1098 diamonds were recovered of which 13 were macrodiamonds and 1085 were microdiamonds. The average diamond abundance for all 178 samples is 6.7 stones/10 kg with individual holes ranging from 3.2 stones/10 kg (DDH CL28-06-16) to 10.9 stones/10 kg (DDH CL28-06-19). The highest individual diamond abundance is 398.5 stones/10 kg in DDH CL28-06-19. A simple arithmetic extrapolation of grade indicates a range of estimated diamond abundance from 2.9 to 16.9 carats per hundred tonnes (cpht) based on averaging results from each drillhole. Individual sample grades ranged up to 732 cpht. Diamond grades for specific lithological units encountered in Kimberlite C28 will be reported once grade forecasts based on stone size distribution and statistical evaluation are completed by Mineral Services Canada Inc.



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Table 1: Kimberlite Intervals and Diamond Counts
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Hole From To Kimberlite Kimberlite Sample Number of Number of
Number Interval Sampled Weight Macro Micro
m m kg Diamonds(1) Diamonds
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C28-06-12 111.94 147.2 35.26 34.41 117.1 0 49
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C28-06-13 121.65 145.35 23.7 23.7 88.3 0 59
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Including 124 136 12 12 44.45 0 36
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C28-06-14 111 158.15 47.15 46.1 164.4 1 86
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Including 113 122 9 9 33.6 1 22
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136.5 144 7.5 7.5 17.75 0 26
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CL28-06-15 125 235.85 110.85 102.25 399.9 0 219
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Including 226 230.5 4.5 4.5 19.1 0 49
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CL28-06-16 115 156.95 41.95 40.85 145.65 0 47
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CL28-06-17 No Kimberlite
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CL28-06-18 112.5 162.5 50 46.05 170.2 4 87
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CL28-06-19 108.35 229.2 120.85 110.45 433.29 8 464
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including 153 200.8 47.8 47.8 200.4 7 364
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including 176 200.8 24.8 24.8 107.5 7 309
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CL28-06-20 109.8 140.9 31.1 31.1 118.85 0 74
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Hole Total Total Stones/ Grade
Number Diamonds 10kg cpht
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C28-06-12 49 4.2 3.7
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C28-06-13 59 6.7 6.6
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Including 36 4.5 11.4
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C28-06-14 87 5.3 5.9
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Including 23 3.3 9.3
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26 5.1 22.7
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CL28-06-15 219 5.5 3.7
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Including 49 10.0 14.4
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CL28-06-16 47 3.2 3.0
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CL28-06-17
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CL28-06-18 91 5.3 16.9
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CL28-06-19 472 10.9 16.4
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including 371 7.9 31.4
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including 316 12.6 53.8
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CL28-06-20 74 6.2 4.1
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Macrodiamonds in this disclosure are defined as diamonds in which two dimensions are greater than 0.5 mm. The previous definition of macrodiamonds used at Candle Lake and by many others was defined as a diamond with one dimension greater than 0.5 mm; for comparison, use of this less stringent cut-off gives recovery of 66 macrodiamonds and 1032 microdiamonds.

Within individual drill holes, there are significant kimberlite intersections that demonstrate higher grade potential and/or occurrence of larger stones in the kimberlite. Most of the intervals with higher grade values are within an upper unit of the body, which is dominantly medium to very coarse grained pyroclastic kimberlite. The most significant intercept is in DDH C28-06-19 which has a 47.8 m intersection with 7.9 diamonds per 10 kg (stones/10kg) and an extrapolated grade of 31 carats/100 tonnes (cpht) and encompassing a higher grade zone of 24.8 m containing 12.6 stones/10kg at 53 cpht. Other thicker zones showing higher grades are listed in Table One. Individual samples representing shorter intervals (less than 3 m thick) in four of the drillholes range up to 173 stones/10kg and 732 cpht. It is noted that small kimberlite samples are more prone to a "nugget effect" whereby the chance occurrence of a few larger stones may cause wide variations in grade.

"Diamond recovery from the C28 Kimberlite has produced a substantial number of diamonds from throughout the tested intervals. High stone abundances typically double those of other large kimberlites in Fort a la Corne, recovery of significant numbers of macrodiamonds from small samples, and early-stage grade estimates of greater than 30 cpht for zones up to 48 m thick show these bodies have strong potential to be amongst the best in the Fort a la Corne Field.", stated Brent C. Jellicoe, President and CEO.

Diamond recovery is reported in sieve size classes in Table 2. The recovery of significant numbers of stones in the sieve classes greater than 0.212 mm in size may indicate a large stone potential in this kimberlite. In addition, individual descriptions of the diamonds indicate the presence of several amber and pink stones.



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Figure 2: Diamond distribution by sieve size ( greater than 0.106 mm)
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Sieve Size
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Hole Number 0.85 0.60 0.425 0.30 0.212 0.150 0.106
mm mm mm mm mm mm mm
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C28-06-12 0 0 0 5 9 13 22
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C28-06-13 0 0 1 6 1 16 35
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C28-06-14 0 0 1 8 11 16 51
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C28-06-15 0 0 0 9 21 51 138
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C28-06-16 0 0 1 3 3 12 28
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C28-16-18 1 2 1 2 9 27 49
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C28-06-19 0 6 4 30 59 138 235
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C28-06-20 0 0 0 3 16 13 42
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Total 1 8 8 66 129 286 600
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Brent C. Jellicoe, P.Geo. is a Professional Geoscientist in the Province of Saskatchewan and is the Qualified Person responsible for the verification and quality assurance of analytical results.

Great Western Diamonds Corp. is an exploration and mine development company currently focused on several diamond prospects including the 100%-owned Candle Lake Diamond Project in central Saskatchewan. Great Western is committed to increasing shareholder value through an aggressive, results-driven exploration and evaluation program targeted on reaching a pre-feasibility decision on the Candle Lake kimberlites by the end of 2007. While Candle Lake is the core diamond project, the Company continues to build a balanced and geographically diverse project portfolio with both advanced and grass-root diamond properties.

Brent Jellicoe, P.Geo., President & CEO

The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of the foregoing contents

Contact Information

  • Great Western Diamonds Corp.
    Brent Jellicoe
    President & CEO
    (306) 668-0701
    or
    Great Western Diamonds Corp.
    Doug Patrick
    (306) 961-2785
    or
    Great Western Diamonds Corp.
    226 Cardinal Crescent
    Saskatoon, SK S7L 6H8
    Email: info@gwdc.ca
    Website: www.gwdc.ca