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
Table 13.7 Samples Assays
Sample ID
Grades
Pb, % Zn, % Ag, g/t
Low Grade Composite 0.45 1.32 -
High Grade Composite 2.18 2.7 327
PUD 147 2.72 2.02 375
PUD 093 3.07 4.34 143
PUD 001 4.3 5.96 487
PUD 106 1.52 1.86 136
PUD 146 1.44 2.38 268
PUD 037 2.15 1.63 86
PUD 170 1.65 1.37 139
PUD 203 0.78 0.8 62
PUD 159 1.74 0.81 690
13.8.3 Grindability
Laboratory Rod Milling curves were produced for all the samples to determine the milling
times required to achieve different grinds. This was done by milling 1 kg sample portions for
different time periods. The milled products were wet screened at 53 μm and dry screened at
150 μm, 106 μm, 75 μm and 53 μm.
The main target grind for the flotation tests was d80 75 μm. From this information, the milling
times to achieve this target were determined. The milling times required for the samples
indicated a high degree of variability in hardness between the sample types.
13.8.4 Flotation Experimental Procedures and Results
In total 65 open circuit flotation tests (exploratory test work) were carried out and 4 Locked
Cycle flotation tests. These investigated:
Initial Flotation conditions supplied by apogee Silver (11 tests)
Initial Variations of known Pb/Zn differential flotation (10 tests)
Differential Pb/Zn sulphide rougher flotation (26 tests)
Pb rougher and cleaner rate flotation tests (10 tests)
Pb and Zn differential cleaner flotation tests (4 tests)
Pb only cleaner flotation tests (4 tests)
All the flotation products were assayed by XRF. Later, in the test work, the high grade
concentrates were assayed by chemical titration methods, which are more accurate for high
grade products.
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