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 />
17.1.2 Milling Circuit<br />
Each of the two parallel ball mills circuits receives ore from its fine ore bin via an<br />
electromagnetic vibrating feeder discharging onto the mill feed conveyor belt. Each ball mill<br />
(2,700 mm by 3,600 mm ball mill with rubber liners) is in closed circuit with its cluster<br />
cyclone. De-rated power is 560 kW.<br />
Milled ore slurry at 70.9 percent solids by weight discharges from the ball mill through a<br />
trommel screen into a pump box and pumped with Wilfley centrifugal pumps to the cyclone<br />
cluster. The slurry is diluted with process water, and then classified in a D-6 (4 operating, 2<br />
stand-by) Weir cyclone cluster with 150 mm diameter cyclones. Floor spillage from the sump<br />
pump is pumped to the mill discharge pump box.<br />
Oversize particles report to the cyclone underflow apex and return to the ball mill feed for<br />
further size reduction. Particles that have met the eighty percent passing size of 74 microns<br />
report to the cyclone overflow via the vortex finder and move on to the rotospiral trash<br />
screen (2 mm) for waste fibre removal (woodchips, plastics, etc.) and then onto the flotation<br />
section.<br />
The following reagent suite will be added to the ball mill feed:<br />
ZnS0 4 .7H 2 O : NaCN Complex (3:1)<br />
Each milling circuit (1 & 2) feeds each of the two (2) parallel flotation circuits (lead and zinc)<br />
17.1.3 Lead Flotation Circuit<br />
Milled slurry is directed to the high intensity conditioning tank (0300-TK-001/3) in the lead<br />
flotation circuit where the iron pyrite depressor (NaCN), Sodium Ethyl Xanthate (SEX)<br />
collector, Sasfroth 200 and pH modifier (Ca (OH) 2 ) are added. After conditioning, the slurry<br />
is directed to the lead rougher cell flotation feed pump box (0300-PB-001/007) where<br />
Sodium Ethyl Xanthate (SEX) collector and Sasfroth 200 are added. The slurry is then<br />
pumped to the lead rougher cell (Imhoflot G cell 1.4, 0300-CL-001/6); the tailings are<br />
directed to the lead rougher/scavenger cell (Imhoflot G cell 1.4, 0300-CL-002/7). Similarly,<br />
the lead rougher/scavenger cell tailings are sent to the lead scavenger cell (Imhoflot G cell<br />
1.4, 0300-CL-003/8). The lead scavenger tailings are pumped to the zinc flotation whilst the<br />
lead rougher, rougher/scavenger and scavenger concentrates are directed to the lead<br />
cleaner circuit. SEX collector, KU5 (CMC, Carboxymethyl Cellulose) and ZnSO 4 .7H 2 O:<br />
NaCN complex are added into the cleaner feed pump boxes (0300-PB-004/5 and 0300-PB-<br />
010/11).<br />
The lead cleaner circuit has two flotation cells in series (Imhoflot G cell 0.8, 0300-CL-004/9,<br />
0300-CL-005/10).The final lead concentrate flows to the lead concentrate surge tank (0300-<br />
TK-002) and the final lead concentrate is pumped to the lead recessed plate pressure filter<br />
for dewatering.<br />
17.1.4 Zinc Flotation Circuit<br />
The lead circuit tailing is directed to the high intensity conditioning tank (0400-TK-001/3) in<br />
the zinc flotation circuit where pH modifier (Ca(OH) 2 ), CuSO 4 .5H 2O (sphalerite activator),<br />
Aero 3418A collector and Sasfroth 200 are added. The slurry is then pumped to the zinc<br />
TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473<br />
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