Pulacayo Project Feasibility Study - Apogee Silver
Pulacayo Project Feasibility Study - Apogee Silver
Pulacayo Project Feasibility Study - Apogee Silver
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<strong>Pulacayo</strong> 1 000 t/d Phase I <strong>Feasibility</strong> <strong>Study</strong> - NI 43-101 Technical Report<br />
090644-3-0000-20-IFI-100<br />
16.12 Underground Infrastructure and Mine Services<br />
This section summarizes underground infrastructure and mine services required to support<br />
the extraction of the ore body at <strong>Pulacayo</strong>. The designs have been made for Levels Zero,<br />
25, 50, 75, 90, 116 and 147.<br />
16.12.1 Existing Underground Infrastructure and Installations<br />
The following infrastructure and services currently exist at <strong>Pulacayo</strong> mine:<br />
<br />
<br />
<br />
Two vertical shafts, namely Shaft No. 1 and Shaft No. 2 (Candelaria 1). Of these two,<br />
Candelaria 1 has been selected for the placement of water and air distribution<br />
equipment for the mine. It has a diameter of 2.5 m and it is still in good condition.<br />
A fresh water line (150mm steel pipe) which transports water from Yanapollera Dam<br />
(located 13 km away from the mine) along the Pacamayu and the San Leon tunnel<br />
entrances.<br />
A fresh water reservoir where the water from the dam is stored. The reservoir is<br />
placed near the San Leon tunnel entrance and is used to supply water to the mine<br />
and the village of <strong>Pulacayo</strong>.<br />
16.12.2 Proposed Mine Services<br />
Compressed air supply and distribution: Compressed air will be provided by two<br />
compressors, each with a capacity of 0.823m 3 /s (1744 cfm) and a compressed air storage<br />
vessel with a capacity of 10 m 3 . The compressors will be connected in parallel to allow one<br />
compressor working on normal operation conditions and two compressors when there is<br />
peak demand. The second compressor will also act as a standby in case of breakdown or<br />
maintenance. Compressed air will be supplied via a 150mm HDPE pipeline. The pipeline will<br />
run from surface to Level Zero (through Candelaria 01) where it will be diverted to the<br />
workshop and ramp access on Level 25, and towards east and west on Level Zero. A<br />
smaller pipeline (100mm) will be used to transport the compressed air along Level Zero.<br />
From the ramp access, the pipeline (150mm) will run down the ramp to the various levels. All<br />
the pipelines will be fixed on the side walls of the tunnels, and supported by chains placed<br />
every two meters and connected to roof bolts.<br />
Water supply and distribution: A 300 m 3 capacity tank will be used to supply water to the<br />
mine. The tank will supply water by gravity through a 100mm HDPE pipeline at a rate of 29.3<br />
m 3 /h. The pipeline will run from surface to Level Zero (through Candelaria 1) where it will be<br />
diverted to the workshop and ramp access on Level 25, and towards east and west on Level<br />
Zero. From the ramp access, the pipeline will run down the ramp to the various levels. All the<br />
pipelines will be fixed on the side walls of the tunnels, and supported by chains placed every<br />
two meters and connected to roof bolts.<br />
Electrical equipment: A sub-station and an encapsulated power generator will be placed on<br />
surface on Level +147. The sub-station will consist of a switchgear (400 kW, 400 V, 3φ, 50<br />
Hz, at 4 200 m). The substation will consist: switchgear MT (25 kV), power transformer (2<br />
MVA, 25/0.4 kV), main switchgear (0.4 kV, 3 phases, 3H, 50 Hz) and a distribution<br />
transformer (100 kVA 380/220 V) amongst others. Three mini sub-stations will be placed<br />
TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473<br />
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