Pulacayo Project Feasibility Study - Apogee Silver

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Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 no problematic level of sample material cross-contamination exists within the associated dataset. However, increasing incidence of spiking Ag between 2 and 4 g/t is present in the dataset and should be reviewed for cause. Figure 12.23: Blank Sample Values Ag G/T (N=102) Figure 12.24: Blank Sample Values Pb % (N=102) TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 81
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 Figure 12.25: Blank Sample Values Zn % (N=10) 12.3.3 Quarter and Half Core Duplicate Split Check Sample Programs January 2010 to July 2011 In addition to scheduled analysis of duplicate splits of core sample pulps by the laboratories, Apogee carried out a program of quarter core and half core sampling to check on sample variability and lab consistency during this report period. A total of 149 duplicate samples were processed by ALS in Lima, Peru, during the period, including 107 quarter core samples associated with drill holes PUD134 through PUD211A and 42 half core samples associated with drill holes PUD176 through PUD214. Ag results are presented in Figure 12.26 for half core duplicates and in Figure 12.27 for quarter core duplicates and have correlation coefficients of 0.84 and 0.83 respectively. Although the duplicate samples in both cases returned higher values in general than the original results, duplicates of high grade original samples show greater variability. Pb and Zn results of duplicate samples show a higher degree of correlation with the original result. Pb half core duplicate samples (Figure 12.28) and quarter core duplicate samples (Figure 12.29) have correlation coefficients of 0.97 and 0.94 respectively and Zn half core duplicate samples (Figure 12.30) and quarter core duplicate samples (Figure 12.31) have correlation coefficients of 0.96 and 0.95 respectively. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 82
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Pulacayo Project Feasibility Study - Apogee Silver

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