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Derry, Michener, Booth & Wahl Consultants Ltd. Page 238.0 DEPOSIT TYPES8.1 Los Planes and Las Colinas<strong>The</strong> current model for the gold mineralization at Los Planes and Las Colinas is similar to thatdescribed at the nearby Paredones Amarillos deposit, 55.6 MMT grading 1.05 g/t Au (Snowden,2003), and other deposits, including the Mesquite Mine in California (194 MMT grading0.62 g/t, 2006) and La Herradura, 49.4 MMT, grading 1.06 g/t Au in Sonora, México (Penoles1998). <strong>The</strong> latter two are classified as Sonoran Megashear gold deposits. <strong>The</strong> general descriptionis included in the name, Shear Zone Gold deposits, as used by Gibson et.al. (1996) and Brownet.al. (1998). <strong>The</strong> shear zones are generally within crystalline metamorphic or igneous rock ofmoderate to low grade metamorphism. Peraluminous intrusives related to anatectic metamorphicprocesses are usually important parts of the geology of these deposits. (See Section 9.0 foradditional discussion of deposit model).Wallis (2004) describes it below:Figure 7 illustrates a conceptual model. <strong>The</strong> mineralization is associated with both shallowdipping shear zones and high-angle structures that are the probable conduits of mineralizationoriginating from the peraluminous granodiorites which have intruded the basement metamorphicrocks. <strong>The</strong>se mineralizing conduits have deposited precious metal mineralization in shallowdipping shear zones that are occupied by cataclasite and mylonite. Alteration is dominated bysericite with lesser amounts of quartz, sulphides and potassium feldspar. Refer to Fig 8.18.2 Paredones AmarillosAn abbreviated description of this gold deposit is taken from the Mine Development Associates(‘MDA’) summary in their feasibility study of Paredones Amarillos in June <strong>2007</strong>. <strong>The</strong> publishedreserves and resources are:Reserves: 48,496,000 tonnes @ 1.01gAu/t (cutoff grade 0.38 gAu/t) base caseResources: 11,498,000 tonnes @1.17gAu/t measured44,170,000 tonnes @1.02g/Au/t indicated5,495,000 tonnes @0.79gAu/t inferred“<strong>The</strong> main ore host is a 10 to 80 metre thick, north-east to east-west striking, 15 degrees to 45degrees, southeast-dipping cataclasite and mylonite unit. Main stage gold mineralization isassociated with the cataclasis and mylonitization event. <strong>The</strong> cataclasite is a dense, competentrock composed of approximately 50% crushed quartz and feldspar fragments in a matrix ofsericite and minor chlorite and fine-grained quartz.In the field, the term cataclasite is used for any tectonized, brecciated, pervasively sericite alteredrock, in which no primary intrusive textures are preserved. Though this is technically analteration description, through usage on the project it has been adopted as the cataclasitedescription. <strong>The</strong> hanging wall contact with the cataclasite is generally sharp, but the footwallcontact may be gradational over several tens of metres with strongly fractured and sericitizedgranodiorite grading to fresh granodiorite.
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