Pulacayo Project Feasibility Study - Apogee Silver

Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report
090644-3-0000-20-IFI-100
underground on Levels Zero, 75 and 145 along the access ramp. Each mini sub-station will
consist of LT switchgear (0.4 kV), MT switchgear (3.3 kW) and a transformer (3.3/0.4 MVA
0.5 kV). In case of power failure, the power generator will be used.
16.12.3 Proposed Underground Infrastructure
Underground workshop: The workshop will be located in an old hoist chamber on Level Zero
(see Figure 16.11). It will be used to do daily and minor maintenance on the underground
mining fleet. The services will include a wash bay, fuel and lube bay and a tyre change bay.
Major services will be handled in the existing main workshop on surface. The surface
workshop will be equipped with all the machinery and tools required to perform the tasks.
Collection ponds: Collection ponds will be installed along the access ramp on Level Zero,
Level 75 and Level 147, to collect the water used for drilling and other mining activities. The
ponds will have a length of 30 m, a width of 4m and a height of 2m and they will be able to
store water for 6 hours without the need for pumping (as a contingency). In addition, each
pond will have three centrifugal pumps for dewatering. Two pumps will be used for pumping
the water stored in the pond (one pump will be on standby) and the other pump will be used
to recirculate the fluid and thus prevent any settling of sludge or solids. The pumping system
has been designed in a cascade configuration. The benefits of this configuration include low
energy consumption and reduced pressure in pipelines.
Submersible pumps will also be installed in Candelaria 1 and various other centrifugal
pumps will be installed on surface. The water will be pumped out of the mine via a 150mm
HDPE pipeline to a settler on surface (Level +147). Once the water has been treated, it will
be pumped back to the 300 m 3 storage tank.
Figure 16.11: Location of the Underground Workshop
TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473
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