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 The administration building, security office, located close to the main access road and entrance to the mine, will be provided with hand-held fire extinguishers. These extinguishers will be distributed throughout the offices and common areas in accordance with Bolivian Fire Codes. 18.5.3 Potable Water Distribution Potable water will be supplied to the ancillary facilities at the plant site. Fresh water will be treated and stored in a potable water self-contained treatment plant adjacent to the process water tanks. Potable water treatment will consist of carbon filtering, hypochlorate addition system (inside a container) and ultraviolet (UV) disinfection. 18.6 Sewage Collection Sewage collection at the plant and mine site, will be comprised of buried gravity septic tanks (with carbon filters). There will be no surface disposal to the environment. 18.7 Communications There is a basic communication system in the project office in Pulacayo. Cell phone communication is the key instrument for surface communication. A radio system is also used by the geology team. Internet service depends on a wireless system that is obtained from a phone and data repeater in Pulacayo town and distributed through the offices. The services will be improved for the construction stage with a base radio. The laboratory will also be served with internet and radio signal. All vehicles will be equipped with radios and essential personnel will have hand held radios. Key personnel will also be equipped with mobile telephones. Cellular phones will have coverage to Pulacayo as a safety precaution. 18.8 Fuel and Lubricant Storage and Distribution Diesel will be delivered to mine by rail tankers (3 m3) and will be off-loaded into the UG fuel distribution tank from where it will be pumped to various areas of use on the mine. Plant Diesel fuel and oil distribution will be limited to loading and unloading facilities and metering equipment at the diesel fuel tank at the plant site. Hydraulic and engine oils will be delivered into the mine by suitable utility vehicles. Lubricants will be delivered to the site in drums and stored in a secure area. 18.9 Tailings Disposal Facility 18.9.1 Tailing Management Background The final flotation tailings will be filtered and dewatered in a paste plant (see Section 17.1.7) to between 63% and 70% solids by weight. Part of the paste will be pumped to and distributed within the underground workings (see Section 17.1.7) and the balance will be pumped to and distributed within the tailings storage facility (TSF). The TSF will be located in a gentle, natural value immediately down gradient of the paste plant at a nominal elevation of 4,030 m. The TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 189
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 pumps, piping and electrical systems are included in the paste plant and discussed in that section of this report as well as the related costs reported in those cost areas. The tailings production by year and the distribution between underground backfilling and discharge to the TSF are summarized in Table 18.1. The allowance for underground disposal has used a series of conservative assumptions and, as such, the quantity going to the TSF (and the resulting size of the TSF) should be somewhat overstated. This approach ensures that there will always be adequate TSF capacity and that the TSF operating cost estimates are conservative. On the other hand, the basin has ample room for more tailings should additional capacity be needed. Table 18.1: Tailings to the TSF by Year Year Annual Production (x1,000 t) Cumulative Production (x1,000 t) 1 0 0 2 43 43 3 56 99 4 30 129 5 118 247 6 152 400 7 144 543 8 49 593 9 42 635 10 90 725 11 81 806 12 360 1,166 13 180 1,346 18.9.2 TSF Design Concepts The TSF will be developed by first constructing four small starter dikes, one upstream of the other and within the same drainage. Construction of the starter facility will start before commissioning of the paste plant, and will continue concurrently with the paste plant during Year 1. This is to allow placement of cement-treated tailings along the valley floor to seal the basin. The facility will be expanded annually during the dry season by raising two dikes each year by 4 m. Below the first dike (Dike 1) will be a small emergency pond and monitoring ports for the subdrain system. The emergency pond is to manage surface waters that enter the TSF and has a working capacity of 1,750 m 3 . The subdrain monitoring ports are to collect the discharge from the subdrains (to allow testing and return to the TSF or emergency pond, as needed) with a working capacity of 15 m3 Figure 18.2 shows the ultimate general arrangement of the facility. The tailings handling circuit, from the discharge of the paste plant to the TSF, will have the following equipment: TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 190
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Pulacayo Project Feasibility Study - Apogee Silver

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