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
In general, the work describe next will help advance the project to the basic/detailed
engineering stage: Spatial variations in key geomechanical characteristics,
geomechanical drill holes, lab strength testing and numerical modeling.
26.2.2 Hydrogeology
A field investigation campaign including additional hydrogeology drill holes and
piezometer installation.
Acquire water inflow data during tunnel excavation.
Compile a detailed numerical hydrogeological modeling of mine inflows.
Perform in-depth hydrogeological studies to determine the groundwater inflow and
quality as well as to define fissure water underground.
Further study on hydrogeological conditions are needed for estimating water handling
and underground pumping requirements.
26.2.3 General
The mobile capital and operating costs require further refinement with manufacturer
specific data for spare parts and major rebuilds.
From a mine planning standpoint, TWP recommends an in-depth examination of the
factors that contribute the most to the cost or mined material head grade.
Modify the mine plan to include increased resources and identify areas of the mine
amenable to lower cost bulk mining methods.
Prepare a mine dewatering plan to comply with safety plans during operation.
26.3 Metallurgy and Mineral Processing
Conduct additional variability test work to further optimize the flow sheet and reagent
suite to ensure the concentrates specifications are optimized.
Pilot plant pumping tests for cemented paste fill.
An opportunity exists to optimize process related capital and operating costs. These
include an alternate crushing design furnished with a scrubber for clays washing and
handling instead of having high pressure nozzles for clays washing.
Further mineralogical analysis (QUEMSCAN) of the deposit to further understand the
mineralogy throughout the deposit. Further explore the potential influence of the
presence of variable amounts of copper in the ore in flotation lead and zinc
selectivity.
Lead and zinc concentrates filtration tests at the selected mill grind size are required
to confirm the filter sizing, the type of filter and attainable cake moisture.
26.4 Infrastructure
Additional engineering work including updates of mechanical, civil, electrical and
instrumentation design are recommended for the basic/detailed engineering phase.
A detailed Project Execution Plan will be developed during the basic/detailed
engineering work.
TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473
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