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 A second outlet from the mine has been included in the design and will be available for people in case of emergencies. This outlet will be located in the vent raise adjacent to the west ramp. The vent raise measures 3 m (h) x 3 m (w). It will have fresh air intake from surface and it will be equipped with a ladder system. The raise intersects the west ramp at each level and hence will be accessible from all levels, as shown in Figure 16.5 below. Figure 16.5: A Secondary Mine Outlet (Vent Raise) 16.3 Mine Production The mine has been designed for an ore production of 1,000 tons (t) per day. The mine plan indicates a total of 3,557 Million tons of ore and 0.839 Million tons of waste. These will be extracted over a planned 12.5 Life of Mine (LOM). The average grades over the LOM are 239 g/t for silver, 1.09% for lead and 1.91% for zinc. A summary of the annual mine production plan is outlined in the table below. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 151
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 Table 16.1: Annual Mining Schedule Year Ore Mined (Tonnes) Silver Grade (G/T) Lead Grade (%) Zinc Grade (%) Silver Production (MIL OZ) Lead Production (Tonnes) Zinc Production (Tonnes) Dev Waste (Tonnes) 1 11,316 129 0.63 1.37 0.047 71 155 36,072 2 97,886 244 1.71 2.61 0.767 1,673 2,552 162,058 3 170,872 332 1.66 3.27 1.826 2,828 5,581 119,344 4 259,160 365 1.77 3.05 3.045 4,576 7,916 38,137 5 283,979 341 1.44 2.18 3.117 4,083 6,182 106,003 6 405,150 272 1.28 1.89 3.548 5,202 7,663 378,273 7 361,355 262 1.53 2.13 3.050 5,519 7,702 0 8 365,009 198 0.80 1.40 2.327 2,928 5,124 0 9 363,243 199 0.77 1.56 2.320 2,809 5,650 0 10 361,982 191 0.72 1.63 2.222 2,615 5,912 0 11 366,580 191 0.69 1.66 2.251 2,528 6,093 0 12 367,580 173 0.81 1.65 2.043 2,979 6,057 0 13 143,572 178 0.78 0.92 0.822 1,115 1,319 0 Overall 3,557,684 239 1.09 1.91 27.39 38,926 67,906 839,887 16.4 Hydrogeology No detailed hydrogeological studies have taken place at the modern Pulacayo mine. Despite this, water is not expected to be a problem on the first seven levels of the mine (Level Zero to Level 147). This conclusion is based on the information obtained from the existing workings at the mine. TWP recommends that a hydrological study be done before mining beyond level 147. 16.5 Geotechnical TWP conducted a geotechnical investigation at Pulacayo mine. The purpose of the investigation was to define geotechnical conditions of the rock mass, identify geological features that will affect stability and determining mining spans, pillar dimensions and support requirements for the different excavations. The investigation consisted of the engineering geological description, assessment and geotechnical logging of borehole core and underground mapping. TWP Projects’ Geotechnical Engineer, Mr. Xolisani Ndlovu, visited site from 13 May to 27 May 2012 to carry out the geotechnical investigation. Dr Michael Roberts oversaw Xolisani’s entire project work. 16.5.1 Quality of the Rock Mass A total of 29 boreholes with ore intersections were selected for the evaluation. Eighteen boreholes previously logged by Geomecanica Latina S.A were also included in the analysis in an attempt to increase the database of rock mass characterization. On plotting both sets of TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 152
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Pulacayo Project Feasibility Study - Apogee Silver

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