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
Table 14.1: Silver, Lead and Zinc Statistics for Uncapped 1 m Composites
Parameter Ag Metal Domains Pb Metal Domains Zn Metal Domains
Mean Grade 122.10 (g/t) 1.04 (%) 1.54 (%)
Maximum Grade 8,279.2 (g/t) 26.7 (%) 28.5 (%)
Minimum Grade 0.14 (g/t) 0.01 (%) 0.01 (%)
Variance 90,402.59 2.53 3.49
Standard Deviation 300.67 1.59 1.86
Coefficient of Variation 2.46 1.52 1.21
Number of Composites 8,068 6,952 11,398
14.3.4.6 High Grade Capping Of Assay Composite Values
A grade cap for each metal was applied to 1 m assay composites to limit influence of high
grade anomalous results having limited demonstrated continuity. Composites were capped at
levels of 1,500 g/t for silver and 15% for both lead and zinc that correspond with the 99.3,
99.9, and 99.8 percentiles for each metal respectively. A subjective check on applicability of
capping factors was carried out on the basis of logged geology and mineralization styles and
it was concluded that the presence of 1 m intervals of mineralization at the selected capping
grades were geologically reasonable, with local potential for both strike and dip continuity at
such levels. Descriptive statistics were calculated for the 1 m capped assay composites and
are presented in Table 14.2. As expected, mean composite grades for each metal decrease
relative to the mean grades of the raw composite values presented above. The Coefficient of
Variation for capped datasets is also lower, indicating that they are more statistically
acceptable for resource estimation purposes. Distribution histograms, cumulative frequency
plots and probability plots for capped 1 m composites for all metals are included in the
previously disclosed resource estimate technical report by Cullen et al. (2012).
Table 14.2: Silver, Lead and Zinc Statistics for Capped 1.0 m Composites
Parameter Ag Metal Domains Pb Metal Domains Zn Metal Domains
Mean Grade 114.87 (g/t) 1.04 (%) 1.53 (%)
Maximum Grade 1,500 (g/t) 15.00 (%) 15 (%)
Minimum Grade 0.14 (g/t) 0.01 (%) 0.01 (%)
Variance 47,015.29 2.41 3.12
Standard Deviation 216.83 1.55 1.77
Coefficient of Variation 1.89 1.49 1.15
Number of Composites 8,068 6,952 11,398
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