Pulacayo Project Feasibility Study - Apogee Silver

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Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 control is essential because only slight changes in moisture content cause wide variations in viscosity and pipe friction. Some water release (bleed) was observed in all of the samples tested. 13.5 SGS Lead and Zinc Concentrate Assays The ED&ED lab flotation concentrates (open circuit tests) were submitted to SGS lab to get an idea of the deleterious elements in the concentrate. These values were used in the Net Smelter Return (NSR) calculations. Mineralogical analyses of concentrate samples from composites PUL-HG (high grade sample) and PUL-LG (low grade sample) have been included. The results showed that the lead concentrate assayed 47.2% Pb and 6,273 g/t with 1.3% Cu, 1.45% As and 1.23% Sb. The zinc concentrate assayed 53.8%Zn with negligible copper, arsenic or antimony. The lead, silver and zinc concentrate grades are in agreement with the LCT carried out before. Concentrations of deleterious elements appear below typical smelter penalty thresholds, with arsenic appearing as the principal penalty element. 13.6 Concentrate Filtration Test work Concentrate test work results were not available at the time of writing this report. It is recommended that test work be performed on a representative sample provided by the Client in order to confirm the pressure filter sizing (Andritz). 13.7 UTO Metallurgical Test program (Stage 4) In 2012, UTO received a single composite sample and conducted a metallurgical test work program comprising: A single collective flotation test A series of open circuit differential flotation (with a de-sliming step) A single locked cycle flotation test (with de-sliming step) PORCO flow sheet testing This test work was designed to explore the flotation response of the ore to conventional differential flotation and to establish the operating conditions, reagent scheme and consumptions. 13.7.1 Fourth Set of Samples Apogee (ASL) provided Universidad Técnica de Oruro (UTO) with a bulk composite sample prepared by ASL out of drill cores with grain sizes up to 76.2 mm (3”). A summary of the head core grades and assays are summarized in Table 13.7. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 107
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 Table 13.6 Fourth Sample Composite Head Core Grades and Assays Sample ID Core Details Estimated Core Grades Head Assays Size, kg Ag, g/t Pb, % Zn, % Ag, g/t Pb, % Zn, % UTO Sample 68.6 Half Core 225.8 0.63 1.1 270 1.04 2.13 13.7.2 Sample Preparation and Testing Procedure The bulk sample preparation and testing procedure was as follows: Crushing Sample homogenization, quartering, and sample sizing for flotation tests Single bulk flotation test (1) Open circuit differential flotation tests (4) Single locked cycle differential flotation test (1) Bulk flotation tests under PORCO flowsheet (6) 13.7.3 Open Circuit Differential Flotation with a De-sliming Step A single bulk flotation test (Test N° 1) was carried out to identify the floating fraction of the ore (sulphides) and to have an indication of metal losses. In addition, a series of open circuit flotation circuit were carried out to determine the flotation performance (range of concentrates grades and recoveries obtained by differential flotation). Then, a locked cycle test was carried out under the most suitable conditions (Test N°6). The first exploratory test indicated that silver recovery to bulk concentrate is about 72%, while the lead and zinc recoveries are approximately 66% and 78%. The floating fraction account for about 13% w/w while the slimes fraction is 18%, the rest is lost as final tailings. Lead and silver losses are up to 23% and 13%, respectively. A series of open batch flotation tests were performed. The results indicated that lead recovery is in between of 48% and 54%, while zinc recovery is in the range from 50.1% to 72%. Total silver recovery to both lead and zinc concentrates is in between 30% and 68%. Lead concentrate grades range from 33.5% to 59%, zinc concentrate grades is in between of 49% and 55%. Similarly, silver grades in both concentrates range from 9,875 g/t to 15,333 g/t. A single locked cycle test (LCT), a repetitive batch used to simulate a continuous circuit where all the intermediate material added to the appropriate location in the flowsheet, was conducted to produce a metallurgical projection of the sample tested and to assess if the flowsheet and reagent suite is stable. A good locked cycle test achieves steady state, typically over the last three cycles. Steady state implies both stability and mass conservation. Stability implies constancy. It was not indicated whether the test reached stability or whether mass conservation was achieved. Assuming that steady state was reached, the results indicated that lead and zinc TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 108
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Pulacayo Project Feasibility Study - Apogee Silver

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