HIGHLIGHTS: Drilling at Espiritu has intersected more high-grade silver with gold, zinc and lead within a polymetallic epithermal system.
Drill hole ESDD006 intersected 5 significant lodes of silver-gold-zinc-lead mineralization, including: 102.25m to 106m; 3.75m at 11.77g/t silver, 1.54g/t gold
172.75m to 173.15m; 0.4m at 355g/t silver, 0.36g/t gold, 3.55% zinc
206.15m to 206.65m; 0.5m at 187g/t silver, 1.44g/t gold
277.5m to 278.0m; 0.5m at 550g/t silver, 0.26g/t gold
313.0m to 313.5m; 0.5 at 93g/t silver, 0.68g/t gold, 2.45% zinc
Hole ESDD008 was just completed at 359.97m, intersecting altered and silver-lead-zinc bearing zones, adding significant scale to the system with a strike extent now of over 200m. Hole ESD009 commenced.
A significantly larger system at Espiritu is emerging based on mapping, soil sampling, interpretation of geophysics, and ongoing drilling. Narrow high-grade zones and intervening lower grade zones can be bulked and outline larger mineralized bodies.
Drilling on the Brama gold-copper porphyry target is expected to commence the first week of February. The drill hole is targeting a magnetic anomaly below a mineralized breccia interpreted to represent a 'pencil porphyry' gold-copper target.
FURTHER INFORMATION:
Assay results and geological interpretation from hole ESDD006 show multiple silver-gold bearing structures with various orientations.
Drilling of hole ESDD008 has been completed at 359.97m and has intersected altered and mineralized intervals that indicate increasing confidence in the interpreted geometry and that the Espiritu discovery has the potential to be a large system with currently over 200m of strike containing local bonanza grades. On a gold or silver-equivalent basis, the intersections reported are significant.
Drill hole ESDD009 has been commenced and is targeting an area 250 south of ESDD008.
Drilling to date has only tested to a depth of 250m below surface in two locations at Espiritu. Evidence of multiple lodes means there are several opportunities to follow-up bonanza grades across the area drilled to date. Narrow high-grade zones and intervening lower grade zones can be bulked and outline larger mineralized bodies. Both concepts are being explored - high grade narrow veins and larger lower grade systems.
Cornerstone Vice President Exploration,
Ongoing mapping and soil sampling are defining a large system potentially up to 1.2km x 800m and genetically related to the Brama porphyry system. This geological scenario is not surprising and significant examples can be found throughout Central and
Porphyry Drilling at Brama target
Drilling of the Brama porphyry gold-copper system is expected to commence in early
The drill hole will be drilled to 900-1000m and is expected to be completed in early March.
About Bramaderos
Measuring 4,948 hectares, the Bramaderos project is located approximately 130km from the Loja provincial capital in southern
The Bramaderos concession is owned by
Sampling and assaying
PLAMIN uses a fire assay gold technique for Au assays (FAS-111) and a four acid multi element technique (IMS-230) for a suite of 48 elements. FAS-111 involves Au by Fire Assay on a 30-gram aliquot, fusion and atomic absorption spectroscopy (AAS) at trace levels. IMS-20 is considered a near total 4 acid technique using a 20g aliquot followed by multi-element analysis by ICP-AES/MS at ultra-trace levels. This analysis technique is considered suitable for this style of mineralization.
Standards, blanks and duplicates are inserted 1/28 samples. The values of the standards range from low to high grade and are considered appropriate to monitor performance of values near cut-off and near the mean grade of the deposit. The check sampling results are monitored and performance issues are communicated to the laboratory if necessary.
Sample security was managed through sealed individual samples and sealed bags of multiple samples for secure delivery to the laboratory by permanent staff of the joint venture. MS Analytical is an internationally accredited laboratory that has all its internal procedures heavily scrutinized in order to maintain their accreditation. MS Analytical is accredited to ISO/IEC 17025 2005 Accredited Methods.
PLAMIN's sampling techniques and data have been audited multiple times by independent mining consultants during various project assessments. These audits have concluded that the sampling techniques and data management are to industry standards. All historical data has been validated to the best degree possible and migrated into a database.
Rock samples are collected by PLAMIN's personnel, placed in plastic bags, labeled and sealed, and stored in a secure place until delivery by PLAMIN employees to the LAC y Asociados ISO 9001-2008 certified sample preparation facility in
Rock samples are prepared crushing to 70% passing 2 mm (10 mesh), splitting 250 g and pulverizing to 85% passing 75 microns (200 mesh) (MSA code PRP-910). Prepared samples are then shipped to MS Analytical Services (MSA), an ISO 9001-2008 laboratory in
Soil samples are dried at low temperature, screened to 80 mesh (MSA code PRP-757); a 15 grams portion is then assayed for a multi-elements suite (MSA code IMS-136, Aqua Regia digestion, ICP-AES/MS finish).
Quality assurance / Quality control (QA/QC)
About Cornerstone
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Contact:
Tel. (514) 904-1333
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