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  Orvana Exploration (Copperwood)

In January 2009, Orvana engaged AMEC E & C Services Inc. of Phoenix, Arizona to audit the core handling and sampling protocol, definitively assess the validity of historical data , and estimate mineral resources using not only validated legacy information, but information acquired from the 82-hole, 13,000-metre drill program completed in October 2009.  A total of 113 holes for 17,645 metres, which includes 26 holes from the 1950s drilling as well as 5 holes from the 2008 drilling, provide a nominal 150-metre drill spacing over an area of 1,850 metres by 1,700 metres.  The resource estimate is planned to be released in early 2010.

Hole From (Metres) To (Metres) Interval (Metres) Cu (%) Ag ppm
CW-08-09 38.14 41.27 3.13 1.46 3.0
CW-08-13 137.09 140.35 3.26 2.01 6.9
CW-08-16 203.75 206.80 3.05 2.08 6.4
CW-08-17 164.50 167.47 2.97 1.77 4.2
CW-08-20 94.74 97.87 3.13 1.49 2.9

These results confirm the thickness and grade expected at their respective locations based on the historical drilling.

In 2008, Orvana obtained core from 11 of the 42 holes drilled during the 1950s within T49N, R46W, Section 1, part of the land covered by the Copperwood mineral leases. Six of these holes were considered to be acceptable for resampling and assaying as part of the validation of historical assays. A total of 54 intervals from the remaining AQ-sized half core, within which the 1950s sampling tags were intact, were resampled. The comparative assay results over the higher-grade zone are given in the table below.

Hole From
(Metres)		 To
(Metres)		 Interval
(Metres)		 Historic
Cu, %		 New
Cu, %
M57-48 166.57 166.79 1.21 1.04 0.97
M57-52 114.84 117.70 2.86 1.35 1.61
M57-58 108.83 112.53 3.70 2.12 2.18
M57-64 158.66 161.33 2.67 2.02 2.23
M57-109* 64.36 66.66 2.30 2.00 2.03
M57-116 39.00 42.01 3.01 1.48 1.54
* - M57-109 not located in the field.

Assays were completed by Activation Laboratories Ltd., an ISO/IEC 17025 and CAN-P-1579 registered laboratory. The QA/QC protocol included internal and laboratory standards and blanks. AR-ICP values were determined using an agua regia extraction with an ICP/OES finish. Assay values were determined for samples with Cu > 1000 ppm also using an agua regia extraction with an ICP/OES finish. Even though a statistical analysis show that all results are within acceptable limits, Orvana will proceed with repeat analyses of selected intervals and standards at another laboratory.		   Copperwood Drill Locations


Click to enlarge

Copperwood Cross-Sections


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Stratigraphic Column


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Copperwood Assays
 
January 2010 (PDF)


QA/QC (PDF)