CINCO DE MAYO PROPERTY
MUNICIPIO VILLA AHUMADA CHIHUAHUA, MEXICO
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The Cinco de Mayo Project is a 25,000 hectare district scale project owned 100% by the Company. Cinco de Mayo is located approximately 190 kilometres north of the city of Chihuahua, in northern Chihuahua State, Mexico, and is the most advanced of MAG's Carbonate Replacement Deposit ("CRD") Projects. The project consists of four major mineralized zones: the Upper Manto silver-lead-zinc body; the Pegaso deep discovery; the Pozo Seco high grade molybdenum-gold resource area; and the surrounding Cinco de Mayo exploration area.
Upper Manto (Jose Manto - Bridge Zone)
The 2012 drilling program was largely focused on delineation drilling to determine the width and continuity of high grade silver / lead / zinc mineralization intercepts discovered in 2011 in what was called the "Bridge Zone". The "Bridge Zone" spans the gap between mineralization in the long-known Jose Manto and Cinco Ridge areas.
Definition drilling in the Bridge Zone proceeded on a series of sections spaced approximately 250 metres apart. Each section was tested with a fence of holes designed to intercept the mineralization every 50 metres downdip. Most holes were drilled at -70 degrees inclination and intercepts appear to be close to true width. The best intercepts were: Hole 430, on the 383 Section at the northwest end of the Bridge Zone, which reported 84 g/t (2.4 ounces per ton ("opt")) silver with 1.6% lead and 11.0% zinc over 11.79 metres; including: 160 g/t (4.7 opt) silver with 3.2% lead and 12% zinc over 5.87 metres; including: 2.54 metres that grades 258 g/t (7.5 opt) silver with 7.1% lead and 25.9% zinc; and Hole 418, on the 382 Section at the southeast end of the Bridge Zone which reported 131 g/t (3.8 opt) silver with 4.6% lead and 6.8% zinc over 9.17 metres; including: 2.70 metres that grades 256 g/t (7.5 opt) silver with 6.8% lead and 8.0% zinc (see press release dated September 6, 2012).
Overall, the 2012 drilling demonstrated that mineralization is continuous from the Jose Manto through the Bridge Zone to Cinco Ridge, which is now collectively referred to as the "Upper Manto" to differentiate it from mineralization hit at depth in the "Pegaso Zone" (see below).
On October 3, 2012, MAG announced that Roscoe Postle Associates Inc. ("RPA") had completed the first independent mineral resource estimate for the Upper Manto zone (see press release dated October 3, 2012). Inferred Mineral Resources are estimated to be 12.45 million tonnes at 132 g/t (3.9 opt) silver, 0.24 g/t gold, 2.86% lead, and 6.47% zinc (9.33% lead plus zinc) (see Table 1).
An economic cut-off grade set at a net smelter return ("NSR") of US$100 per tonne was applied as the base case for this initial resource estimate.
Table 1: Mineral Resource Estimates for the Upper Manto, Cinco de Mayo as of September 1, 2012
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Resource Category (NSR $100/tonne Cut off)
Lead + Zinc %
Silver Ounces M
Lead M lbs
Zinc M lbs
CIM Definition Standards have been followed for classification of mineral resources.
Mineral resources are reported at a NSR cut-off value of US$100/tonne.
NSR values are calculated in US$ using factors of $0.60 per g/t Ag, $12.32 per g/t Au, $18.63 per % Pb and $14.83 per % Zn. These factors are based on metal prices of US$27.00/oz Ag, US$1,500/oz Au, $1.15/lb Pb and $1.20/lb Zn and estimated recoveries and smelter terms.
A minimum mining width of two metres was used.
Totals may not add correctly due to rounding.
No data from recent drill hole CM12-431 in the newly discovered deep Pegaso Zone (see below) was used in this estimate.
Sensitivity analysis of the new resource to higher NSR cut-offs reveals significant higher grade portions. This is demonstrated by the $150 NSR cut-off case which gives a total of 9.4 million tonnes of 151 g/t (4.4 opt) silver, 0.26 g/t gold, 3.37% lead, and 7.35% zinc (see Table 2).
Table 2: Resource Sensitivity to Various NSR Cut --Off Values
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NSR CUT-OFF ($/t)
Pb + Zn %
Silver Ounces M
Lead M lbs
Zinc M lbs
Footnotes: As per Table 2 above, with exception of footnote 2 (mineral resources are reported at NSR cut-off values as indicated.)
Qualified Person: The Mineral Resources for the Cinco de Mayo Property disclosed in this MD&A are derived from the NI 43-101 compliant technical report entitled "Technical Report on the Upper Manto Deposit, Chihuahua, Mexico," authored by Mr. David Ross, P.Geo., an employee of Roscoe Postle Associates and independent of MAG and filed on SEDAR on November 16, 2012. Dr. Peter Megaw, Ph.D., C.P.G., a "Qualified Person" for the purpose of National Instrument 43-101 and a Director of MAG has read and approved the contents of this MD&A as it pertains to the disclosed mineral resource estimate.
Hole CM12-431: The Pegaso Zone
In mid-June 2012, exploration hole CM12- 431 drilled deep beneath the overlap zone between the Bridge Zone and the Jose Manto, cut four significant sulphide intervals within a 300 metre wide skarn and marble zone (see press release dated July 18, 2012). The largest and deepest interval was 61 metres of high-grade massive sulphides that lies behind (to the southwest of) the structures that host the Upper Manto mineralization. This is an entirely new mineralization zone named the "Pegaso Zone", which shows all of the hallmarks of being a near-source part of the CRD system that MAG has been systematically seeking at Cinco de Mayo. The mineralization in the upper intercepts of hole CM12-431 are likely connected to the high-grade silver-lead-zinc mineralization in the 4 kilometre long Upper Manto, indicating that continuous mineralization exists from 125 to 900 metres vertical depth.
These new mineralized intercepts in hole CM12-431 start at 730 metres down hole and continue to nearly 1,000 metres depth down hole (approximately 900 metres vertical depth). The Pegaso Zone is the thickest and deepest intercept, beginning at 927 metres down hole and continuing for 61.6 metres with an average grade of 89 g/t (2.6 opt) silver, 0.78 g/t gold, 0.13% copper with 2.1% lead and 7.3% zinc; including: 31.9 metres that grades 117 g/t (3.4 opt) silver, 1.13 g/t gold, 0.16% copper with 2.7% lead and 9.3% zinc. The Pegaso Zone lies behind (southwest of) the structures that host the Upper Manto, and appears to be a totally new mineralization zone. The three additional intercepts (see Table 3) ranging from 3.12 to 20.15 metres thick lie above this, between 817 and 900 metres depth. The best is the 10 metre intercept (817.22 - 827.22 metres down hole) which returned 1.38 g/t gold, 139 g/t (4.1 opt) silver, 0.11% copper, 2.62% lead and 11.8% zinc. This intercept is believed to be the down-dip extension of the Bridge Zone. The gold and copper grades in all four intercepts are the highest and most consistent yet encountered on the project. Significantly, broad zones of coarse marble and pervasive tungsten-bearing garnet skarn occur above, between and below the massive sulphide zones, but no intrusions were seen in hole CM12-431 and very little of the sulphides encountered to date in the Pegaso Zone appear to be replacing skarn silicates. These results suggest both that the near-intrusion source zone is nearby but has not yet been reached.
Table 3: Pegaso Zone
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Pb+ Zn (%)
+ Contains Pb overlimit (>30 wt%)
* Contains Zn overlimit (>30 wt%)
Quality Assurance and Control -- Cinco de Mayo: The Company has in place a quality control program to ensure best practices in sampling and analysis. Samples were collected by employees of consulting firm Minera Cascabel S.A. de C.V. on behalf of MAG Silver Corp. The diamond drill core samples are shipped directly in security sealed bags to ALS-Chemex Laboratories preparation facilities in Hermosillo, Sonora or Chihuahua City (Certification ISO 9001). Sample pulps are shipped from there to ALS-Chemex Laboratories in North Vancouver, Canada for analysis. All samples were assayed for gold by standard fire assay-ICP finish with a 50 gram charge. Gold values in excess of 3.00 g/t were re-analyzed by fire assay with gravimetric finish for greater accuracy. Silver, zinc, copper and lead values in excess of 100 ppm, 1%, 1% and 1% respectively are also repeated by fire assay and atomic absorption analysis.
Summary of combined Upper Manto-Pegaso Zone results
Combining hole CM12-431 with holes CM12-392 and CM12-399, plus shallower drilling throughout the Upper Manto area (See press releases of March 22, May 17 and July 18, 2012), indicates that mineralization is continuous from 125 metres to 900 metres vertical depth, with a significant broadening in the Pegaso Zone between 800 and 900 metres depth. This broadening coincides with an increase in skarn alteration and increasing zinc, gold and copper grades -- consistent with what MAG's CRD zoning model predicts as a source zone is approached. Overall, near-surface Upper Manto mineralization appears higher in silver and lead than deeper Pegaso Zone mineralization which is richer in zinc, copper and gold. The combined vertical metals and alteration zoning and broadening of mineralization is typical in CRD systems worldwide and strongly indicates that the source intrusion is being approached. The overall strength and style of mineralization and alteration further indicate that this source zone may be very large. The strongest mineralization has been found within the overlap zone between the fault slices that host the shallow Jose Manto and the Bridge Zone, suggesting that this structurally complex zone acted as a major conduit for mineralizing fluids and perhaps intrusive emplacement. The degree of mineralization seen so far indicates that the source intrusion could be surrounded by very large-scale mineralization (see press release of May 17, 2012).
Because of the expense of drilling at these depths, MAG has contracted for the execution of an orientation 2 and 3 Dimensional Seismic survey to determine if the system can be better defined in this area before further deep drilling is undertaken. However, further exploration and drilling can resume only upon obtaining the Soil Use Change Permit, drill permits and a surface access agreement with the local Ejido (see below).
"Soil Use Change Permit" and surface access
As of May, 2012, exploration drilling permits in Mexico require a "Soil Use Change Permit," reflecting conversion of land from agricultural to industrial use. These permits incorporate verification of mining concession title, compliance with environmental norms, and surface access permissions. The Ministry of Environment and Natural Resources (the "Ministry") has received and approved the Company's mining concession titles, acknowledging our mineral rights ownership. The Ministry has also examined the Company's water usage and road and drill pad reclamation programs, and advised that the Company has demonstrated compliance above and beyond environmental norms. Into the fourth quarter of 2012, the Company was in the process of negotiating ordinary course surface access permissions with the Ejido Benito Juarez (the "Ejido") as the final component in the application for the necessary Soil Use Change Permits.
The Company had previously purchased 41 specific rights relating to relevant areas of the Cinco de Mayo project area for $660,000 from the Ejido members, who along with the Federal Agrarian Authority had ratified the purchase. The Company was awaiting formal title transfer of the surface rights, when certain members of the Ejido challenged the purchase claiming the 41 rights purchased represented a 41/421 undivided interest in the Ejido owned surface rights, rather than rights to exclusive areas of the property. Given the Company's long-standing and productive working relationship with this Ejido, MAG had anticipated obtaining the requisite access permission and final permit approval sometime in the first quarter of 2013. However, on November 17, 2012 at what the Company believes was an illegally constituted meeting, the Ejido voted to expel MAG from its Cinco de Mayo property and establish a 100 year mining moratorium over Northern Chihuahua. The Company notes that the Ejido assembly has no ability at law to impose a ban on mining as mining is an activity that falls under Federal jurisdiction.
Ejido members challenged the meeting on the grounds that proper notice was not given, key signatures required to properly call the meeting were fraudulent, and that the vote taken at the meeting was fraught with irregularities, including a significant number of votes being cast by unverified proxies. A court hearing was held on February 6, 2013 in Chihuahua where the ejiditarios calling for the meeting to be declared illegal presented their evidence. The opponents who had organized the illegal meeting failed to appear in court on time and their testimony was dismissed by the judge. The judge ordered the Ejido administration to provide original documents for the meeting, which to date they have failed to provide. It is expected to take the judge one to two months to write his decision on the legality of the meeting once he has settled the original documents questions.
MAG remains highly confident that the meeting and the illegal resolutions will be nullified. Once the expected nullification of the November 17, 2012 meeting is issued, the Company will ask government officials to oversee a new assembly meeting of the Ejido to ensure that the necessary procedural and governance rules are respected and the vote is properly conducted. Permission of the Ejido assembly is required to obtain surface access, and although there is no certainty that a new vote would produce a favourable outcome for the Company, MAG believes that the opposition group and its supporters do not represent the will of the majority of the 421 voting members of the Ejido (or of the 12,000 other citizens in the project area). MAG believes that it has the support of a majority of the members of the Ejido and that the requisite authorizations to complete its submission for the Soil use Change Permit will be obtained in due course. Once the surface access permission is obtained, the permit approval process may take 1-3 months to process (during which time the Company will undertake the 2 and 3 Dimensional Seismic surveys referred to above).
The Company remains eager and willing to work with the Ejido and the greater community to define a comprehensive Corporate Social Responsibility Program ("CSR") to coincide with the next phases of our exploration activity. CSR commitments already presented to the Ejido include: repair to the existing medical clinic and staffing it with a full-time doctor and nurse; improving the infrastructure at the local elementary school; offering scholarships to the regional secondary, high school and college programs; developing micro-business opportunities in the town of Benito Juarez; and a cash component. The Company believes that this proposed agreement, valued at approximately $500,000, is generous for the size and stage of the Cinco de Mayo exploration project and is rooted in the Company's approach to business. MAG's goal is to continue its strong working relationship and ensure the Ejido and the greater community benefit from the expected successes and growth at Cinco de Mayo.
The Company believes the Ejido access issue is a temporary delay and is working to resolve the issue on a permanent basis with the Ejido, with the expectation of resuming drilling on the property late in 2013. In the interim, the Company has initiated metallurgical studies in anticipation of a PEA based on the Upper Manto resource.
Pozo Seco Molybdenum-Gold Zone
In late 2009 the Company announced the discovery of a new zone of high grade molybdenum and gold mineralization named "Pozo Seco" in the western part of the Cinco de Mayo project area. Pozo Seco's molybdenum mineralization is comparable in style to molybdenum-bearing mineralization that occurs in the proximal parts of several of the largest Mexican CRD systems, but is many times more extensive than the largest known occurrence in the San Martin-Sabinas skarn-CRD system in Zacatecas. Further, Pozo Seco style gold-bearing silicified limestone breccias (jasperoids) are also common in Mexican CRD systems, but again the Pozo Seco gold mineralized jasperoid is substantially larger than the largest known occurrence in the Santa Eulalia CRD-skarn system in central Chihuahua.
This mineralization is taken as additional evidence that a very large scale CRD system exists at Cinco de Mayo.
In 2010 the Company released an independently prepared first Mineral Resource estimate for the Pozo Seco deposit. Since that time, the Company has worked with three different respected metallurgical laboratories in order to find the best technical solution and associated flow sheet for recovering both oxidized molybdenum and free-milling gold from the Pozo Seco resource. Metallurgical test work indicates that recoveries of both molybdenum and gold are sufficient to warrant the commencement of a PEA, and MAG has engaged Roscoe Postle Associates Inc. ("RPA") and Samuel Engineering to carry out a Preliminary Economic Assessment ("PEA"). The PEA was originally expected to be completed in 2012, but has been extended to include a marketing study on ammonium dimolybdate (ADM), an intermediate product, that if marketable, would reduce the overall operating and capital costs for the project. The PEA is now expected in the fourth quarter of 2013.
The Pozo Seco surface rights are privately owned, and the Company has an access agreement currently in place. The Ejido situation referred to above ("Soil Use Change Permit" and surface access) does not impact Pozo Seco.
Information Concerning Estimates of Mineral Resources
Cautionary Note to Investors Concerning Estimates of Indicated and Inferred Mineral Resources
This document uses the terms "Indicated Mineral Resources" and "Inferred Mineral Resources". MAG advises investors that although these terms are recognized and required by Canadian regulations (under National Instrument 43-101 Standards of Disclosure for Mineral Projects), the U.S. Securities and Exchange Commission does not recognize these terms. Investors are cautioned not to assume that any part or all of the mineral deposits in these categories will ever be converted into reserves. In addition, "Inferred Mineral Resources" have a great amount of uncertainty as to their existence. It cannot be assumed that all or any part of an Inferred Mineral Resource will ever be upgraded to a higher category. Under Canadian rules, estimates of Inferred Mineral Resources are considered too speculative geologically to have the economic considerations applied to them to enable them to be categorized as mineral reserves and, accordingly, Inferred Mineral Resources may not form the basis of feasibility or pre-feasibility studies, or economic studies except for a "Preliminary Economic Assessment" as defined under Canadian National Instrument 43-101. Investors are cautioned not to assume that part or all of an Inferred Resource exists, or is economically or legally mineable.
The Mineral Resources provided above for the Cinco de Mayo property have been estimated by David Ross, P.Geo, an employee of Roscoe Postle Associates, who is a qualified person as defined under National Instrument 43-101 and independent of MAG.