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 to the tailings storage facility (TSF) (at 70% solids) or it is pumped to the backfill plant. Paste is prepared by mixing thickened tailings (65% solids) with cement (6% w/w) to produce a flowing material to be deposited underground. The paste plant is designed to treat 100% tailings. 17.1.8 Reagents Area The reagents used within the plant are: Table 17.2: Reagent Consumption Reagent Unit Consumption Observations Hydrated Lime (Ca(OH)2) kg/t 3.83 pH modifier Sodium Cyanide (NaCN) kg/t 0.03 Iron pyrite depressor Copper Sulphate Pentahydrate (CuSO4.5H2O) kg/t Sodium Ethyl Xanthate (SEX) kg/t 0.03 0.88 Sphalerite activator Collector, lead and zinc separation KU5: Carboxylmethyl Cellulose (CMC) kg/t 0.15 Gangue depressor Zinc Sulphate Heptahydrate : NaCN Complex kg/t 0.08 Depressant for zinc, improve selective flotation of lead mineral Coagulant kg/t 0.1 Improve thickening performance Sasfroth 200 kg/t 0.02 Frother Aero 3418A kg/t 0.01 Collector Flocculant kg/t 0.02 Improve thickening performance Activated Carbon kg/t 0.004 Used in packed carbon columns for process water treatment Reagents will be delivered by road transport to the reagent store. Reagents are then withdrawn from the store, diluted in stirred mixing tanks, drained into the reagent dosing tanks and piped to the flotation sections. 17.1.9 Process Water System Area The process water system is made of two (2) fresh water tanks and four (4) process water tanks. The fresh water tanks (1200-TK-001/002) receive water from the Yana Pollera reservoir. The reagent area, general services, potable water treatment plant, camp and the firewater pump receive water from these tanks. The process water tanks receive make-up water from the fresh water tanks and also recovered water from the Carbon Columns (CIC). Process water is used in the plant and also make-up water for the spray water tank (0100-TK-001) located in the crushing area. In addition, these tanks provide water for hosing. Water treatment facilities to produce potable water will be required at the plant site. The plant spillage will be contained in a dam and pumped back to the mill discharge sump. The TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 175
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 nature of the composition of the drainage and fresh water are not well understood at this stage of the project and the technology required for water treatment will need to be defined during the next stage of engineering studies. The plant sewerage will drain to a septic tank. 17.1.10 Auxiliary Services Area 17.1.10.1 Compressed Air High pressure air will be provided in the plant by the concentrates pressure filter compressor which provides air to operate the lead and zinc concentrates pressure filters. High pressure plant air will also be used for instrumentation in the plant. High pressure air will also be used for instrumentation air in the plant after it has passed through a dryer 17.1.10.2 Diesel Diesel fuel will be required for underground and surface mobile equipment and onsite emergency power generation equipment. A fuel storage container will be located at the plant site and a fuel rail tanker will be used to distribute fuel underground. The emergency generator will have a dedicated diesel storage tank. 17.1.10.3 Emergency Generator During power outage, one diesel generator (75 kW) will supply energy for the paste thickener rake and pumps at the solid liquid separation area and lighting. The critical loads are the thickener rake motor, the thickener underflow pump and general lighting. 17.1.10.4 Tailings Disposal Facility (TSF) Area Paste thickener underflow is directed to the paste tailings storage (1400-TSF-001) facility by gravity or by pumping. The TSF deposit is provided with a water drainage system that allows for water recover. The reclaimed water, which includes the water from the TSF surface, will be pumped to the Paste Thickener to remove any suspended solids (if any) in the water and the Paste Thickener overflow then reports the carbon columns and onto the process water tank. 17.1.10.5 Plant Spillage Containment Area All excessive plant spillage from the crushing, milling and flotation sections will drain to the plant spillage containment dam. The dam has a sloped base, is lined with a geomembrane and equipped with a vertical spindle pump suspended from a frame and the pump is lowered into the slurry with a chain block. Any spillage in the dam will be hosed to the pump and pumped to the mill discharge sump. 17.1.11 Site Layout Considerations The project site is steep, high-altitude terrain that has limited flat space. Due to these considerations, particular attention is required to develop acceptable sites for the facility. The general site arrangement is show in Figure 17.2 and the plant layout is presented in Figure 17.3. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 176
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