Discussion of the Results
The drilling completed to-date at El Reten (seventeen drill holes) has defined an irregular, near-surface zone, locally up to 30 metres thick, comprised of colluvium and variably weathered bedrock where drill core recoveries average between 60%-90%. Below this zone, surficial effects are minimal and drill core recoveries are typically in the 90%-100% range.
The 4,985 metres of drilling at El Reten, as part of the Phase 1 program, has greatly enhanced the Company's understanding of the El Reten magmatic-hydrothermal system. Solvista's geologists have identified up to nine separate porphyry phases based on primary mineralogy, vein mineralogy and habit and cross-cutting relationships that have been involved in the alteration and mineralization at El Reten (Figure 2). Although the majority of the Au-Cu mineralization is spatially related to the El Reten porphyry (CER1), the recognition of significant mineralization spatially related to the intra-mineral porphyry CER7, indicates that there are other potentially productive porphyries at El Reten. Similarly, the recognition of zones of deeper mineralization with greater than 1.7g/t AuEq (for example in CAD-1218 and CAD-1220) associated with bornite-chalcopyrite mineralization indicates that there is potentially a second, deeper zone of higher grade mineralization.
The presence of multi-phase magmatic systems, many of which have associated porphyry-related alteration and Au-Cu mineralization is interpreted by Solvista's geologists as a clear indication of a very dynamic, long-lived, magmatic-hydrothermal system with the potential to host somewhat different styles of mineralization in different geographic locations, but all related to the one mineralizing event. By way of comparison, AngloGold Ashanti's 24 Moz Au(-Cu) La Colosa porphyry project, also in the Middle Cauca Belt, has a total of eight porphyry-related intrusive phases (Garzon, Discovery Colosa Gold-Rich Porphyry Deposit, SIMEXMIN, 2012).
The Company's recently completed Phase 1 drill program was focused on three target areas - El Reten, El Corral and Ajiaco Sur, which represent the three southernmost targets within the currently defined Caramanta Porphyry Cluster (Figure 1). As it is presently understood, the Caramanta Porphyry Cluster, which is 100% owned by Solvista, is a three kilometre long trend with a generally north-south direction, that remains open for expansion in all directions. In previous press releases of the Company, dated June 4, 2012, September 17, 2012, September 25, 2012 and December 11, 2012, the El Corral and Ajiaco Sur targets had both been referred to as one single target under the name Ajiaco Sur, however, because the two areas are characterized by significantly different geology, the Company has divided the original single target into two separate targets (Figure 1). The Company will release drill results from these two targets once all assay results have been received and verified.
The Company continues to explore additional areas within the Caramanta Porphyry Cluster and is currently defining drill platform locations for the Malabrigo and Casa Verde targets, which the Company plans to drill test in Q3 2013.
Quality Control and Assurance
The Company utilizes an industry-standard Quality Assurance/Quality Control program for the taking and analyzing of samples. Rock, drill core and stream sediment samples are prepared and analyzed at facilities in Antioquia, Colombia and Ontario, Canada run by the ActLabs Group of Companies. Gold values were determined by fire assay with an atomic absorption finish on 30 gram samples; other elements were analyzed with a 4 acid digestion and an ICP finish. Blanks, duplicates and certified reference standards are routinely inserted into the sample stream to monitor laboratory performance and a portion of the samples are periodically check assayed at SGS Laboratories in Medellin, Colombia.
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