Venadas Vein Discovery Opens New Juanicipio Exploration Potential
Vancouver, B.C. MAG Silver Corp. (MAG: TSX / NYSE A) (“MAG” or the “Company”)reports the discovery of the northeast (“NE”) oriented ‘Venadas Vein” within the Minera Juanicipio Joint Venture Property (Fresnillo plc 56% / MAG 44%).
- New Venadas Vein discovery is the first ever mineralized vein in the Fresnillo district oriented at a high angle (NE) to the historically mined northwest (“NW”) oriented veins.
- Venadas intercepts lie at a very high-level in the vein zoning model, suggesting considerable depth potential.
- Larger NE structures with intense surface alteration are known within the Juanicipio property and are now high priority exploration targets. None have ever been directly drilled.
The NE-oriented Venadas Vein was inferred from the alignment of fifteen previously unconnected intercepts (See Table 1, Figures 1 & 2) before being cut in an underground development working as a 1.1 metre (“m”) wide vein, reporting 116grams per tonne (“g/t”) (3.4 ounces per ton (“opt”)) silver, 3.16 g/t gold. VEN-1, the first drill hole specifically designed to test the Venadas Vein, cut 3.0 m (drilling width) grading 392 g/t (11.5 opt) silver and 5.54 g/t gold. All intercepts contain negligible base metals and lie above 1,750 m elevation, with most significantly higher than the top of the Valdecañas Vein at 1850 m elevation. This indicates a very high-level overall position in the vein zoning model, suggesting that Venadas has considerable depth potential.
Venadas is the first ever mineralized vein in the overall Fresnillo District oriented at a high angle to the historically mined NW oriented veins. Notably, other much larger NE structures with intense surface alteration are known farther afield within the Juanicipio property and are now priority exploration targets. None have ever been directly drilled.
“This is an entirely new and previously unrecognized vein trend that runs opposite to the expected NW-orientations shown by veins mined for nearly 500 years throughout the known parts of the Fresnillo District. The JV exploration team deserves great credit for puzzling it out” said Dr. Peter Megaw, MAG Silver’s Chief Exploration Officer. “We think these may be very important controls on the overall mineralization system because the Valdecañas Vein gets wider and richer in gold where Venadas and its suspected brethren cross it. Most importantly, the cuts to date are all at high elevations, so we are eager to drill them at depth to see if they improve like Valdecañas”.
- The recognition of NE-oriented veins different from the well-known NW-orientated veins of the Fresnillo District opens many exploration possibilities within the Juanicipio claim and the district as a whole. Similar NE structures with very strong alteration are known elsewhere within the Juanicipio claim and have seen only reconnaissance mapping: All now become priority exploration targets.
- Most Venadas Vein intercepts to date lie above 1,850 m elevation. This is the depth of the top of the Valdecañas Vein where it splits up into thin, irregular silver and gold-rich veinlets with very low base metal values (See Figure 1). This matches the characteristics of the Venadas Vein seen so far (See Table 1), which suggests it should continue to improve in width and grade to depth for several hundred metres.
- The Venadas Vein projects directly towards the overlap zone between the Valdecañas West and East Veins. This zone has the hallmarks of a major mineralizing-fluid upwelling zone and these intersecting structures may have created an ideal vertical channel for upwelling metal-laden fluids to rise quickly and spread laterally into the individual structures.
- Two suspected similarly NE-oriented structures lie a few hundred metres on either side of the Venadas Vein and are also indicated by unconnected intercepts and extensive surface alteration. The structure to the southeast projects into a distinct vertical bulge in the Valdecañas Vein where gold values go up significantly. These targets should be ideal for drill confirmation from underground.
- Cross-cutting 1.1 km southward from the Valdecañas Vein to the high-grade Juanicipio Vein might be significantly accelerated if development could follow mineralization along the route.
Table 1: Assay Results – Venadas Vein Holes
(1) TW = True Width and is estimated from sections.
Venadas Vein History
The Venadas Vein was originally intersected in 2011 in Hole 43P, which cut4.15 m (drilling width) grading 491 g/t silver (14.3 opt) and 2.69 g/t gold Including 1.65 metres grading 965 g/t silver (28.1 opt) and 6.39 g/t gold(See Press Release of September 1, 2011). Several attempts were made to offset this intercept based on the premise that the vein was NW-oriented like all other known veins in the Fresnillo District. When none succeeded the target was shelved. More recently, with the discovery of the Anticipada Vein in the hangingwall of the Valdecañas Vein (See Press Release of August 15, 2016), systematic re-evaluation and remodeling of the many unconnected hangingwall intercepts in historic drill holes led to the recognition that numerous oblique vein intercepts, including 43P, fell on a NE-oriented plane that coincides with a surface-mapped fracture once systematically prospected for kaolinite. Hole VEN-1 was the first hole designed to test this target directly and cut 3.0 m (drilling width) grading 392 g/t (11.5 opt) silver, 5.56 g/t gold, with no Lead, Zinc or Copper at 1,905 m elevation. VEN-1 was completed about the same time the Conveyor Ramp exposed the Venadas Vein underground, where cross-cuts now follow it for roughly 20m in both directions. Channel sampling there shows a 1.1 m width, reporting 116 g/t (3.4 opt) silver, 3.16 g/t gold with no base metals.
Qualified Person: Dr. Peter Megaw, Ph.D., C.P.G., and Lyle Hansen, M.Sc., P.Geo have acted as the qualified persons as defined in National Instrument 43-101 for this disclosure and supervised the preparation of the technical information in this release. Dr. Megaw has a Ph.D. in geology and more than 35 years of relevant experience focussed on silver and gold exploration in Mexico. He is a Certified Professional Geologist (CPG 10227) by the American Institute of Professional Geologists and an Arizona Registered Geologist (ARG 21613). Dr. Megaw is not independent as he is Chief Exploration Officer (CXO) and a Shareholder of MAG. Dr. Megaw is satisfied that the results are verified based on an inspection of the core and underground exposures, a review of the sampling procedures, the credentials of the professionals completing the work and the visual nature of the silver and base metal sulphides within a district where he is familiar with the style and continuity of mineralization. Mr. Hansen is a registered Professional Geologist with Engineers and Geoscientists BC (149624) and has more than 10 years experience in epithermal veins. Mr. Hansen is not independent as he is Geotechnical Director of MAG.
Quality Assurance and Control: The samples are shipped directly in security-sealed bags to ALS-Chemex Laboratories preparation facility in Guadalajara, Jalisco, Mexico (Certification ISO 9001). Samples shipped also include intermittent standards and blanks. Pulp samples are subsequently shipped to ALS-Chemex Laboratories in North Vancouver, Canada for analysis. Two extra pulp samples are also prepared and are analyzed (in progress) by SGS Laboratories (Certification ISO 9001) and Inspectorate Laboratories (Certification ISO 9001) (or other recognized lab). The bulk reject is subsequently sent to CIDT (Center for Investigation and Technical Development) of Peñoles in Torreon, Mexico for metallurgical testing where a fourth assay for each sample is analyzed and a calculated head grade is received on the basis of a concentrate balance. The CIDT also does a full microscopic, XRF and XRD mineralogical analysis.
About MAG Silver Corp. (www.magsilver.com )
MAG Silver Corp. (MAG: TSX / NYSE A) is a Canadian exploration and development company focused on becoming a top-tier primary silver mining company, by exploring and advancing high-grade, district scale, silver-dominant projects in the Americas. Our principal focus and asset is the Juanicipio Property (44%), being developed in Joint Venture partnership with Fresnillo Plc (56%). Juanicipio is located in the Fresnillo Silver Trend in Mexico, the world's premier silver mining camp and we are currently developing the surface and underground infrastructure on the property to support a 4,000 tonnes per day mining operation with the operational expertise of our JV partner, Fresnillo plc. As well, we have an aggressive exploration program in place targeting multiple highly prospective targets across the property. In addition, we continue to work on regaining surface access to our 100% owned Cinco de Mayo property in Mexico while we seek other high grade, district scale opportunities.
On behalf of the Board of
MAG SILVER CORP.
President and CEO
For further information on behalf of MAG Silver Corp.
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