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 regulators, and small fans] will be used to ensure that the air circulates through the production haulages on its way to the booster fans. The ventilation design is to route intake air to the centre of the mine and to the various levels via the production ramp and central shaft. Air will then flow out from the centre of the mine towards the extremities of each level, then to a ‘gathering level’, proposed to be Level 25. On the East side of the mine, a connection will be made to surface from Level 25, with four fans located at the bottom. This exhaust shaft will handle 120 m 3 /s and will be approximately 10 m 2 in cross-sectional area. On the West side, return air will be routed to several existing ramps that connect to the existing Candelaria 1 and Rothchild shafts. A further 120 m 3 /s will be exhausted from the mine via these routes. Air will be routed from level to level via dedicated ventilation passes, or through old mining connections, where they exist close to where they are required. Figure 16.9 below, illustrates the tonnage and ventilation requirement of the mine with time. Figure 16.9: Stoping Tonnage versus Annual Ventilation Requirements with Time Figure 16.10 below shows what the ultimate ventilation layout of Pulacayo mine will be. Light blue airways denote main intake airways, with red denoting return airways. Dark blue are the production levels. The black colored level denotes the workings on Level Zero, which will be mined as conventional shrinkage stopes. The layout incorporates some risk – the routes to the surface connections are small and possibly highly restricted. Existing plans and documents have been scrutinized to estimate the size of these airways, and ventilation modeling software [VUMA and Ventsim] were used to determine the required fan capacities. Discussions with mine staff have indicated that there would be a willingness to re-raise some connections if necessary. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 159
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 16.9 Mining Productivity 16.9.1 Mine Operating Schedule The production elements of the Pulacayo mine will operate on a 24/7 basis. The mine is scheduled to operate two 10 hour shifts per day over a period of 345 days per annum. This results in a total of 6,900 gross operating hours per annum. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 160
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Pulacayo Project Feasibility Study - Apogee Silver

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