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 16.7 Alternative reinforcement design at the bottom of a stope to be backfilled The reinforcement will be installed remotely to ensure the safety of people. It is proposed that two operators position themselves on either side of the top of the stope (wearing PPE), or on a suitable portable steel gantry placed across the top of the stope. The reinforcement will be attached to ropes and lowered to the bottom of the stope. This operation may be facilitated by two additional operators, one at the top and one at the bottom of the stope in the entrance, using portable radios to direct the operators in lowering the strips. Bulkhead construction: Once the reinforcement has been installed, the stope will be sealed off with a bulkhead (see Figure 16.8 below). The outside of the bulkhead will be supported by a temporary hardwood timber structure. The timber support structure can be dismantled and removed after the backfill has cured for 28 days; thereafter, it can be re-used at another bulkhead. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 157
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 Figure 16.8: Below Shows a Schematic Cross-Section Through a Bulkhead Backfill placement: All stopes will be filled from the level above (top access) to facilitate pipeline flushing. Backfilling will be conducted at filling rates in the range from 30-40 m 3 /hour. This flow rate will provide a satisfactory rate of rise of the uncured pastefill against the fill barricades and allow operations within time constraints of sequenced mining and backfilling. The pastefill will comprise tailings from the process plant and about 6% by mass, cementitious binder. A high cement content is required due to the high clay content of the ore, as well as the tailings derived from it. An initial lower backfill plug will be placed into each stope. The plug will extend vertically to about 1 m above the top of the ore drive tunnel hanging wall. The initial lower plug will be left to cure undisturbed for about seven days, after which, the remainder of the stope will be filled with cemented backfill paste. In the case where there is a shortage of tailings, development waste can be used. The waste has to be dump into the stopes simultaneously with cemented backfill paste to prevent uncemented voids from forming between rocks! In addition, the development waste cannot be dumped into the stopes during the initial plug filling, as this would knock over the upright backfill anchors. 16.8 Ventilation The planned ventilation system for Pulacayo mine is complicated in some respects by a number of unknowns with respect to the existing workings. The planned operations cover a vertical extent of some 150 m over seven levels. The ventilation system is intended to ultimately establish through-ventilation on the main haulages of all levels, from which fans and ducts can draw air for stopes and ore access development. There will not be any ‘main fan’ installations on surface; instead, a number of relatively small (30 m 3 /s each) ‘booster’ fans will be installed underground at positions leading to surface connections. The intent is to ensure that a positive flow of air [from whichever source, including those that may be unknown] will report underground to the position of the fan inlets. Ventilation controls [walls, TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 158
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Pulacayo Project Feasibility Study - Apogee Silver

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