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
the control limits (Figure 12.6). A total of 12 Pb values fall below the ±2 standard deviations
control limits for that metal, with returned values within a +0.025% and -0.135% range of the
certified mean. However, the average Pb value of 1.87% falls within the control limits (Figure
12.7). Returned zinc values are more closely distributed around the certified value than those
of Ag and Pb, with the average returned value of 2.65% being the same as the certified
value. All values fall within +0.32% and -0.13% of the certified mean, with one result above
the control limits (Figure 12.8).
The PB128 standard was used throughout the Phase III drill program, beginning in
January 2008 and continued throughout most of the Phase IV drill program. Use began with
drill hole PUD061 and finished with drill hole PUD208. Results for a total of 91 samples
collected since January, 2010 were reviewed for this report, with these corresponding to drill
holes PUD134 to PUD208, exclusive of hole PUD207. All samples returned results for Pb
and Zn and 89 of the 91 samples returned results for Ag. Ag values fall within a range of
+13 g/t and -8 g/t of the certified mean value and the average value of 181.57 g/t very closely
approximates the 181.08 g/t certified mean value (Figure 12.8). Pb values fall within +0.15%
and -0.27% of the certified mean range and average 4.36%, all of which fall within mean ±2
standard deviations control limits (Figure 12.10). One Zn value falls above the control limits,
but others fall within +0.20% and -0.09% of the certified mean range. The average returned
value of 2.29% falls within the mean ±2 standard deviations control limits (Figure 12.10).
Figure 12.5: Certified Standard CDN-SE-1 Results – AG G/T (N=82)
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