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 remaining mineral reserves along Level Zero should continue to be extracted using shrinkage stoping. Long hole stoping, supported by a fleet of trackless equipment, is recommended for extracting the mineral reserves below Level Zero. Owing to the low strength of the rock mass, the stopes will require backfilling to ensure stability post ore extraction. The reasons for selecting this method instead of sub-level caving are listed below: The mining method allows for selective mining of high grade veins, The mining method will make use of process plant tailings in the backfill, thus minimizing the footprint of the tailings dam on surface and associated environmental liability, The use of cemented backfill is required for geotechnical stability. This will allow for maximum ore extraction without compromising on run-of-mine (ROM) grade while mining stopes adjacent to each other, Better control of dilution, A higher degree of flexibility in the mining sequence. Mining will be undertaken using a top down approach (i.e. access and infrastructure will be developed to the ore body as required). The main objective of using this approach will be to minimize capital expenditure in the early years of the operation. 16.2 Mine Design and Layout 16.2.1 Shrinkage Stoping The shrinkage stopes will have a design stoping height of 30 m and a stope length of 30 m. The stope width will depend on the thickness of the payable vein, which varies between 0.8 m and 2 m. Figure 16.1 shows a typical layout of a shrinkage stope at Pulacayo mine. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 145
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 Figure 16.1: Layout of a Shrinkage Stope at Pulacayo Mine Ore will be mined in horizontal slices from the bottom to the top of a stoping block. Stopers will be used to drill 41 millimeters (mm) diameter blast holes into the hangingwall of the stope, and Anfex will be used to charge the blast holes. During mining, only 30% of the blasted ore (swell) will be drawn out after each blast to create enough headroom for the drilling of the next slice of ore. The remaining broken ore will be stored in the stope to support to the sidewalls and to serve as a working platform. Once the entire stoping block has been mined out, the remaining ore will be drawn out. The broken ore will be drawn out via boxholes. The boxholes will be located along the ore drive and they will be equipped with pneumatically controlled chutes to allow for safe and easy loading. The ore will be loaded into hoppers and it will be trammed out of the mine and tipped at the ore stockpile at the process plant. The mine will use one 4 tonne locomotive pulling five 3 tonne hoppers to accomplish this. At the end of a stope’s life, it will be sealed off accordingly. No backfill will be placed in the stopes. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 146
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Pulacayo Project Feasibility Study - Apogee Silver

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