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 13.2 First Sample Composite Set Grades and Head Assays
Sample ID Core Details Estimated Core Grades Head Assays
Size, kg Ag, g/t Pb, % Zn, % Ag, g/t Pb, % Zn, % Cu, %
High Grade (LA) 105.7 Half Core 301.4 1.57 3.01 268 1.58 2.71 0.67
Medium Grade (LM) 93.9 Half Core 204 0.69 2.56 181 0.69 2.46 0.07
Low Grade (LB) 102.2 Half Core 41 0.75 1.24 46 0.79 1.24 0.03
13.2.2 Comminution Test Work
All samples were submitted for a Bond Ball Mill Work Index (BWI) test. The results are
summarized in Table 13.3.
In the determination of BWI, a sample of representative ore at 100% +3.35 mm is stage
crushed to 100% -6.35 mm.
Table 13.3 Bond Ball Work Index Tests Results Summary
Sample ID Cut Work Index (BBWi)
Mesh, µm
UTO, kW-h/t
Recalculated,
kW-h/t (*)
Average 212 10.3 15.1
150 11.4 14.7
106 12.9 14
Standard Deviation (SD) 212 0.49 0.94
150 0.88 0.31
106 1.51 0.84
Design (Average + 1xSD) 212 10.8 16.1
150 12.3 15
106 14.4 14.8
The Bond ball mill grindability test was performed at 212 µm (65 #), 150 µm (100 #) and
106 µm (150 #). The test results categorized the samples as medium to hard. Abrasion
index, crushing work index and rod work index tests were not performed.
13.2.3 Specific Gravity
A set of specific gravity test work was conducted on various samples as summarized below.
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