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
Locked Cycle flotation test work was conducted on selected ore samples to determine the
concentrate grades and recoveries achievable in a closed circuit. The samples selected
were:
High grade composite:
PUD 147
PUD 001
PUD 106
The conditions for the locked cycle tests were as follows:
A Pb concentrate of 54.6% Pb at a recovery of 91.9% was achieved. A Zn
concentrate of 40.8% Zn at a recovery of 82.9% was achieved. The overall silver
recovery was 89.2% on the High Grade Composite Sample.
A Pb concentrate of 65.8% Pb at a recovery of 90.5% was achieved. A Zn
concentrate of 36.8% Zn at a recovery of 78.6% was achieved. The overall silver
recovery was 67.8% on sample PUD-147.
A Pb concentrate of 69.1% Pb at a recovery of 92.6% was achieved. A Zn
concentrate of 56.4% Zn at a recovery of 89.6% was achieved. The overall silver
recovery was 93.5% on sample PUD-001.
A Pb concentrate of 62.6% Pb at a recovery of 87.8% was achieved. A Zn
concentrate of 38.5% Zn at a recovery of 86.2% was achieved. The overall silver
recovery was 76.9% on sample PUD-106.
The locked cycle results show that good Pb recoveries of between 88% and 93%
can be achieved with a large variation in head grade from 1.5% Pb to 4.3% Pb.
The silver recoveries ranged between 67% and 93.5% with a variation in head
grade of between 136 g/t Ag and 375 g/t Ag.
In order to produce head grade versus recovery curves for Pb and Ag, a low Pb head grade
point was needed. Sample PUD 203 with a head grade of 0.78% Pb was then chosen and a
full open circuit flotation test carried out on it. It resulted in a Pb concentrate grade of 52.9%
Pb at a recovery of 75.3% Pb. The outlier Ag result for PUD 147 was not used.
TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473
Page 111