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 14.9: Isometric View of the Void Blocks in the Block Model (View to NW)
14.3.4.5 Drill Core Assay Composites and Statistics
The drill core assay data set used in the updated resource estimate contains 28,807 core
sample records exclusive of quality control and quality assurance samples, including 24,367
core samples occurring within the peripheral resource domain solid. Sample lengths range
between 0.3 m and 6.0 m for the peripheral domain core sample subpopulation, with over
90% of samples measuring 1.0 m in length. Frequency histograms and cumulative frequency
distribution plots for the sample lengths for these were presented by Cullen et al. (2012).
Based on these results, down hole assay composites at 1.0 m support were developed for
silver, lead and zinc for drill hole intervals intersecting the respective metal domain solid
models. In addition, 627 trench samples completed in 2011 were included in the resource
estimate. Trench samples were converted into horizontal drill holes and included in the down
hole compositing process. No lithological constraints we imposed on down hole assay
compositing.
Descriptive statistics were calculated for each metal from 1.0 m assay composite datasets
constrained within the respective metal domains and results are presented in Table 14.1.
Distribution histograms, cumulative frequency plots and probability plots for the 1.0 m
composites are included in the previously disclosed resource estimate technical report by
Cullen et al. (2012).
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