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Orvana Exploration (Copperwood) Since 2008, Orvana has drilled 146 holes for nearly 19,000 metres, which include holes drilled as water monitoring wells as well as for geotechnical and metallurgical studies, covering an area of 3,400 metres by 1,700 metres in the Copperwood leased area. These holes provide a nominal 150-metre drill spacing for resource and reserve estimates. 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 were within acceptable limits, Orvana repeated analyses of selected intervals and standards at another laboratory. In March 2011, Marston & Marston completed an NI 43-101-compliant resource estimate based on these holes, as well as the historic drill holes, and this estimate was the basis for the NI 43-101-compliant reserve estimate reported in Prefeasibility Study filed in July, 2011. |
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