Avocet Mining PLC Prospectus December 2011

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Avocet Mining PLC West African Projects 6.8.3 Bulk Density A total of 2,859 bulk density tests were undertaken on the 2007 / 08 drill core at two metre intervals on samples of competent core by the water volume weight immersion method. An additional 486 drill core samples from the 2010 / 2011 drill campaign (KLRD001‐KLRD008) have been used for density test work with the water immersion technique. All samples were taken from beyond 100m down hole depth at a rate of one sample per drill core tray (i.e., one sample every 5m). A total of 3.5% of these samples fell outside the values of >3.5g/cc or
Avocet Mining PLC West African Projects Figure 41 Scatter plot of blank assays Table 47 details a summary of QA/QC work conducted on samples from the Koulékoun area (including Kodieran and Balandougou) between November 2010 to April 2011. Table 47 QA/QC results from November 2010 to April 2011 Sample types Number of samples Failed QC % of failed QC Original Samples 22726 - - Field duplicates 1121 285 25.42 Blanks 1287 3 0.23 Standards 1065 97 9.11 Total 26199 - - Two standards supplied from Ore Research and Exploration Standards (OREAS) were used (OREAS 61d and OREAS 62Pb) alternatively in the ratio of one standard in twenty samples. These 60gm standards are mixed into a measured 3kg blank sample to provide a sample that is indistinguishable from normal sample submissions. However, to determine the accuracy of the laboratory, the weight of the diluting, barren material is required to calculate the expected assay grade. This information is unavailable and no conclusions can be drawn in regard to the laboratory precision. OREAS standards have been discontinued from October 2010, partly due to poor performance. The details of Certified Reference Material (CRM) used are listed in Table 48 below. Report No: R253.2011 130 347
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AVOCET MINING PLC * PROSPECTUS * DE
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Avocet Mining PLC Prospectus December 2011

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