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
samples. The insertion rate was at least 1 blank per 50 samples submitted. Blank samples
used by Apogee consisted of blank reference material BL107 obtained from WCM, standard
reference material CDN-BL-7 obtained from CDN and a field “coarse blank” that was
prepared from a source of barren quartzite outcropping near the Pulacayo deposit. Blank
results from all three blank materials are reviewed together and pertain to drill holes PUD134
through PUD214.
The blank results reviewed are deemed acceptable and no significant or systematic crosscontamination
effect is interpreted to be present. Average blank values of 0.879 g/t Ag,
0.0014% Pb, and 0.0053% Zn are below expected values for both the field and commercial
blanks. Returned blank Ag results are consistently near expected values, with 4 results
greater than 2 g/t and a maximum value of 4 g/t (Figure 12.20). Pb blank results are more
variable, with 8 results greater than 0.003% and a maximum value of 0.007% (Figure 12.21).
A total of 6 Zn blank samples returned a value greater than 0.010%, with three results
returning values of 0.018%, 0.021%, and 0.021% (Figure 12.22). The majority of the blank
sample anomalies are associated with field blanks prepared by Apogee and may reflect
heterogeneity of such material.
Figure 12.20: Blank Samples Values Ag G/T (N=174)
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