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 They also frequently exhibit vuggy texture and have local infillings of quartz and barite (Figure 7.7). ) Figure 7.6: Crustiform Texture In Nq Core (~47.6 MM Width Figure 7.7: Vuggy Texture With Quartz And Barite Infilling In Nq Core (~47.6 mm Width) TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 41
Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report 090644-3-0000-20-IFI-100 8 DEPOSIT TYPE The Pulacayo deposit has been classified as an epithermal deposit of low to intermediate sulphidation state or association. Deposits of this type have been extensively researched and various summary publications that document specifics of the association are available. Examples of these include Lindgren (1922), White and Hedenquist (1994), Corbett and Leach, (1998) and Corbett, G.J., (2002). The following discussion of this deposit type is presented without change from Cullen and Webster (2012), who cited the work completed earlier by Presasacco et al. (2010). Pressacco et al. (2010) highlighted the following key geological characteristics of Pulacayo that support classification as a low to intermediate sulphidation epithermal deposit and Figure 8.1 provides a schematic summary of the general deposit model: The vein and disseminated sulphide mineralization is hosted by Tertiary volcanic rocks of intermediate composition that form part of an outcropping dome complex. The mineralized body is composed of narrow veins, veinlets, stock works and disseminations in argillicly-altered host rock that are controlled by an east-west oriented fault system. Width of the mineralized zone varies from a few m or less to 120 m. Sedimentary rocks intruded by the dome complex host high grade veins such as TVS that are typically less than 3 m in width but transition to stock work and disseminated zones in overlying andesitic volcanic rocks that reach as much as 120 m in width. The sulphide mineralization has been proven to continuously occur along strike for 2 700 m and to a depth of approximately 100 m below surface. The vein system mineral assemblages are relatively simple and in combination are diagnostic of an epithermal setting. They consist of galena, sphalerite, tetrahedrite, and other silver sulfo-salts that form the main assemblage of economic interest and barite, quartz, pyrite and calcite that are present as gangue phases. Chalcopyrite and jamesonite are present in minor amounts locally. Internal texture of veins is typically banded and drusy with segments containing almost massive sulphides. This is typical of epizonal veins that have been subjected to multiple pulses of mineralizing fluid. Vertical metal zonation exists within the deposit that includes a mid-elevation zone of highest silver values that transition with depth to progressively increasing total base metal concentrations. TWP Sudamérica S.A. Av. Encalada 1257 Of. 801, Santiago de Surco Lima 33, Perú (51-1) 4377473 Page 42
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Pulacayo Project Feasibility Study - Apogee Silver

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