Pulacayo Project Feasibility Study - Apogee Silver

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Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 and underground mining methods and is not applicable to oxide zone resources because recovery of lead and zinc is not anticipated from the oxide zone. Bulk Density Density determinations were performed systematically by Apogee staff using the Archimedes method on selected core samples. Results were compiled with corresponding lithologies in a digital spreadsheet and a total of 29344 analyses were available for use in this updated resource estimate. Mercator imported these results into the Surpac resource database and normalized data by developing 1 m down hole composites for drill hole intervals occurring within the metal domain and peripheral domain solids. Descriptive statistics for the 21,331 specific gravity composites that occur within the resource estimate peripheral constraint solid are presented in Table 14.4 (sulphide zone) and Table 14.5 (oxide zone). Corresponding distribution histograms and cumulative frequency plots for the volumetrically dominant sulphide zone are presented in Figure 14.14. Table 14.4: Density Statistics for 1 m Composites in Peripheral Domain Sulphide Zone Parameter Specific Gravity Mean 2.35 g/cm 3 Maximum 6.20 g/cm 3 Minimum 1.02 g/cm 3 Variance 0.10 Standard Deviation 0.32 Coefficient of Variation 0.13 Number of Composites 18,200 Table 14.5: Density Statistics For 1 m Composites in Peripheral Domain Oxide Zone Parameter Specific Gravity Mean 2.16 g/cm 3 Maximum 5.54 g/cm 3 Minimum 1.00 g/cm 3 Variance 0.07 Standard Deviation 0.27 Coefficient of Variation 0.13 Number of Composites 3,131 Mercator considers variation in model space bulk densities to be primarily dependent on variation of contained sulphide levels in core samples. Sulphide content is also closely related to overall metal grades within the resource peripheral constraint. Assignment of the average specific gravities of 2.35 g/cm 3 and 2.16 g/cm 3 for the sulphide and oxide zone, respectively, across the entire deposit was not considered appropriate, due to these TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 131
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 recognized spatial density inhomogeneities. Density values were therefore interpolated into block model space using ID 2 methodology and constant parameters for each metal. This produced three independently interpolated density values for each block derived from separate interpolations based on the three metal sets and interpolation routines. The highest interpolated density value for each block was selected as the database block density attribute. Figure 14.14: Cumulative Frequency and Distribution Histogram of Density Results in Peripheral Domain Sulphide Zone Extremely low density values in the database were flagged and plotted on the drill hole traces along with geology and drill hole assay grades to assess their validity. Values less than 1.50 g/cm 3 were found to most commonly occur in samples from drill hole PUD005. Core from this hole is characterized by competent lithologies that would be expected to have density values more closely approximating the data set mean. This issue was further assessed by comparing PUD005 density values for core intervals for similar metal grades in similar rocks in adjacent drill holes. These intervals showed values close to or greater than the mean data set value and it was concluded that results below 1.50 g/cm 3 were erroneous where no logged physical core attributes could explain the low value present. These suspect results were excluded from the density interpolation process for the resource block model. 14.3.4.10 Resource Category Definitions Definitions of mineral resource and associated mineral resource categories used in this report are those recognized under National Instrument 43-101 (NI 43-101) and set out in the Canadian Institute of Mining, Metallurgy and Petroleum Standards On Mineral Resources and Reserves Definitions and Guidelines (the CIM Standards). TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 132
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Pulacayo Project Feasibility Study - Apogee Silver

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