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 Figure 14.13: Anisotropic Variograms for Zinc Capped Composite Values 14.3.4.8 Setup of Three Dimensional Block Model The Pulacayo block model was developed using WGS84 (Zone 19, South Datum) grid coordination and a sea level elevation datum. The block model is oriented along Az. 100° with no dip rotation applied and model extents are further defined in Table 14.3. Standard TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 129
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 block size for the model is 5 m x 3 m x 3 m (X, Y, Z); with one unit of sub-blocking to a minimum block size of Table 14.3: Summary of Pulacayo Deposit Block Model Parameters Type Y (Northing m) X (Easting m) Z (Elevation m) Minimum Coordinates 7,744,400 739,350 3775 Maximum Coordinates 7,745,150 741,350 4,501 User Block Size 3 5 3 Min. Block Size 1.5 2.5 1.5 Rotation 10 0 0 *UTMWGS 84 – Zone 19 South and sea level datum 2.5 m x 1.5 m x 1.5 m allowed. As discussed above in Section 14.3.3, the nominal topographic surface as defined by a digital terrain model functions as the upper deposit constraint. 14.3.4.9 Resource Estimation Inverse distance squared (ID 2 ) grade interpolation was used to assign block grades within the Pulacayo block model. As reviewed earlier, interpolation ellipsoid orientation and range values used in the estimation reflect a combination of trends determined from the variography and sectional interpretations of geology and grade distributions for the deposit. The trends and ranges of the major, semi-major, and minor axes of grade interpolation ellipsoids used to estimate silver, lead and zinc grades were described previously in report section 14.3.7. All three metals were evaluated independently using respective assay composite data sets. Block model grade interpolation was a multiphase process for each metal that consisted of sequential interpolation within (1) the interpreted metal domain solids below the oxide surface DTM, (2) the interpreted metal domain solids above the oxide surface DTM, (3) below the topographic surface DTM within the peripheral domain solid and below the oxide surface DTM, and (4) within the peripheral domain solid above the oxide surface DTM and below the topographic surface DTM. Individual metal domain solids, nine for each metal for a total of 27, required multiple interpolation passes to accommodate minor orientation adjustments to the azimuth and dip of ellipsoids. This was done to better accommodate local variations in orientation and geometry of respective domains. The minimum number of contributing assay composites used to estimate a block grade for all metal domains was set at 2 and the maximum number of contributing composites was set at 9, with no more than 3 contributing assay composites allowed from a single drill hole. Block discretization was set a 1Y x 1X x 1Z. Model blocks identified as occurring within the underground workings solid model were removed from the resource estimate after grade interpolation was completed. Interpolated silver, lead, and zinc block grades were used to calculate NSR block values within the sulphide zone by means of the net smelter calculator discussed in section 14.3.3. This calculator considers metallurgy, economics, and costs relevant to sulphide zone resources TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 130
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Pulacayo Project Feasibility Study - Apogee Silver

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