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Mag Silver Corp. Technical Report on the Mineral Resource Update for The MAG SILVER CORP. TECHNICAL REPORT ON THE MINERAL RESOURCE UPDATE FOR THE JUANICIPIO JOINT VENTURE, ZACATECAS STATE, MEXICO NI 43-101 Report Qualified Persons: David Ross, P.Geo. Jason Cox, P.Eng. Holger Krutzelmann, P.Eng. June 12, 2014 Amended June 30, 2014 RPA Inc. 55 University Ave. Suite 501 I Toronto, ON, Canada M5J 2H7 IT + 1 (416) 947 0907 www.rpacan.com Report Control Form Document Title Technical Report on the Mineral Resource Update for the Juanicipio Joint Venture, Zacatecas State, Mexico Client Name & Address MAG Silver Corp. #770 - 800 West Pender Street Vancouver, British Columbia V6C 2V6 Document Reference Status & Final Project #2264 Issue No. Version R1 Issue Date June 30, 2014 Lead Author David Ross (Signed) Peer Reviewer Luke Evans (Signed) Project Manager Approval David Ross (Signed) Project Director Approval William Roscoe (Signed) Report Distribution Name No. of Copies Client RPA Filing 1 (project box) Roscoe Postle Associates Inc. 55 University Avenue, Suite 501 Toronto, ON M5J 2H7 Canada Tel: +1 416 947 0907 Fax: +1 416 947 0395 [email protected] www.rpacan.com TABLE OF CONTENTS PAGE 1 SUMMARY ...................................................................................................................... 1-1 Executive Summary ....................................................................................................... 1-1 Technical Summary ....................................................................................................... 1-5 2 INTRODUCTION ............................................................................................................. 2-1 3 RELIANCE ON OTHER EXPERTS ................................................................................. 3-1 4 PROPERTY DESCRIPTION AND LOCATION ................................................................ 4-1 5 ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY ............................................................................................................... 5-1 6 HISTORY ........................................................................................................................ 6-1 Prior Ownership ............................................................................................................. 6-1 Exploration History ......................................................................................................... 6-2 Previous Mineral Resource Estimates ........................................................................... 6-2 Scoping Study - 2009..................................................................................................... 6-4 7 GEOLOGICAL SETTING AND MINERALIZATION .......................................................... 7-1 Regional Geology .......................................................................................................... 7-1 Property Geology ........................................................................................................... 7-5 Mineralization ................................................................................................................ 7-9 8 DEPOSIT TYPES ............................................................................................................ 8-1 9 EXPLORATION ............................................................................................................... 9-1 10 DRILLING .................................................................................................................... 10-1 11 SAMPLE PREPARATION, ANALYSES AND SECURITY ............................................ 11-1 Sampling Method and Approach .................................................................................. 11-1 Sample Preparation and Analysis ................................................................................ 11-2 Quality Assurance and Quality Control ........................................................................ 11-3 Core Storage and Security ........................................................................................... 11-7 12 DATA VERIFICATION ................................................................................................. 12-1 Site Visit and Core Review........................................................................................... 12-1 Independent Check Samples ....................................................................................... 12-1 Assay Table Review .................................................................................................... 12-2 13 MINERAL PROCESSING AND METALLURGICAL TESTING ..................................... 13-1 Metallurgical Testing .................................................................................................... 13-1 Implications for Process Design ................................................................................... 13-5 Recoveries and Concentrate Grades ........................................................................... 13-6 Metallurgical Study Update .......................................................................................... 13-6 14 MINERAL RESOURCE ESTIMATE ............................................................................. 14-1 Resource Database ..................................................................................................... 14-1 MAG Silver Corp. – Juanicipio Project, Project #2264 Technical Report NI 43-101 – June 30, 2014 Page i www.rpacan.com Geological Interpretation and 3D Solids ....................................................................... 14-2 Statistical Analysis ....................................................................................................... 14-6 Cutting High-Grade Values .......................................................................................... 14-7 Compositing ............................................................................................................... 14-11 Interpolation Parameters ............................................................................................ 14-13 Density ...................................................................................................................... 14-19 Block Model ............................................................................................................... 14-20 NSR Cut-off Value ..................................................................................................... 14-20 Classification ............................................................................................................. 14-21 Mineral Resource Reporting ...................................................................................... 14-22 Mineral Resource Validation ...................................................................................... 14-24 Comparison to Previous Estimate .............................................................................. 14-25 15 MINERAL RESERVE ESTIMATE ................................................................................ 15-1 16 MINING METHODS ..................................................................................................... 16-1 Geotechnical Considerations ....................................................................................... 16-1 Mining Method ............................................................................................................. 16-3 Production Rate ........................................................................................................... 16-4 Backfilling Method ........................................................................................................ 16-4 Haulage ....................................................................................................................... 16-4 Access Development ................................................................................................... 16-5 Ventilation .................................................................................................................... 16-5 Stoping ........................................................................................................................ 16-6 Tonnage and Grade of Material to be Mined and Milled ............................................... 16-9 Underground Mobile Equipment ................................................................................ 16-10 Update Since the 2012 PEA ...................................................................................... 16-14 17 RECOVERY METHODS .............................................................................................. 17-1 Processing Plant and Operations ................................................................................. 17-1 18 PROJECT INFRASTRUCTURE .................................................................................. 18-1 Site Layout ................................................................................................................... 18-1 Access Road ............................................................................................................... 18-1 Power Supply .............................................................................................................. 18-1 Water Supply ............................................................................................................... 18-3 Stockpiles ...................................................................................................................
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