Pulacayo Project Feasibility Study - Apogee Silver

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
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