TREVALI MINING CORPORATION TECHNICAL REPORT ON THE ROSH PINAH MINE, NAMIBIA NI 43-101 Report Qualified Persons: Torben Jensen, P.Eng. Ian T. Blakley, P.Geo., EurGeol Tracey Jacquemin, Pr.Sci.Nat. Avakash A. Patel, P.Eng. May 1, 2018 RPA 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 Rosh Pinah Mine, Namibia Client Name & Address Trevali Mining Corporation 1400 – 1199 West Hastings Street Vancouver, British Columbia Canada, V6E 3T5 Document Reference Project #2927 Status & FINAL Issue No. Version Issue Date May 1, 2018 Lead Authors Torben Jensen (Signed) Ian T. Blakley (Signed) Tracey Jacquemin (Signed) Avakash A. Patel (Signed) Peer Reviewer David JF Smith (Signed) Project Manager Approval Torben Jensen (Signed) Project Director Approval Graham Clow (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 Economic Analysis ......................................................................................................... 1-7 Technical Summary ..................................................................................................... 1-13 2 INTRODUCTION ............................................................................................................. 2-1 3 RELIANCE ON OTHER EXPERTS ................................................................................. 3-1 4 PROPERTY DESCRIPTION AND LOCATION ................................................................ 4-1 Mineral Rights and Land Ownership .............................................................................. 4-1 Surface Rights ............................................................................................................... 4-5 Royalties and Lease Obligations .................................................................................. 4-10 5 ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY ............................................................................................................... 5-1 Accessibility ................................................................................................................... 5-1 Climate .......................................................................................................................... 5-1 Local Resources ............................................................................................................ 5-2 Infrastructure ................................................................................................................. 5-2 Power ............................................................................................................................ 5-3 Water ............................................................................................................................. 5-4 Physiography ................................................................................................................. 5-4 6 HISTORY ........................................................................................................................ 6-1 Prior Ownership ............................................................................................................. 6-1 Exploration and Development History ............................................................................ 6-2 Historical Resource Estimates ....................................................................................... 6-2 Past Production ............................................................................................................. 6-2 7 GEOLOGICAL SETTING AND MINERALIZATION .......................................................... 7-1 Regional Geology .......................................................................................................... 7-1 Structural Geology ......................................................................................................... 7-3 Local and Property Geology........................................................................................... 7-4 Mineralization ................................................................................................................ 7-4 Lens Characterization .................................................................................................... 7-9 Primary Lenses ............................................................................................................ 7-16 Secondary Lenses ....................................................................................................... 7-27 8 DEPOSIT TYPES ............................................................................................................ 8-1 9 EXPLORATION ............................................................................................................... 9-1 Exploration Process and Techniques ............................................................................. 9-1 Exploration Potential Within Rosh Pinah Mine ............................................................... 9-3 Exploration Potential Within EPL 2616 ........................................................................... 9-9 Trevali Mining Corporation – Rosh Pinah Mine, Project #2927 Technical Report NI 43-101 – May 1, 2018 Page i www.rpacan.com Gergarub Project ......................................................................................................... 9-11 10 DRILLING .................................................................................................................... 10-1 Survey Grids ................................................................................................................ 10-3 Drill Planning and Site Preparation .............................................................................. 10-3 Collar Surveys ............................................................................................................. 10-3 Downhole Surveying .................................................................................................... 10-4 Geological Logging ...................................................................................................... 10-4 Geotechnical Logging .................................................................................................. 10-7 Sampling ...................................................................................................................... 10-7 11 SAMPLE PREPARATION, ANALYSES AND SECURITY ............................................ 11-1 Sample Preparation and Analysis ................................................................................ 11-1 Quality Assurance and Quality Control ........................................................................ 11-3 Security...................................................................................................................... 11-16 12 DATA VERIFICATION ................................................................................................. 12-1 Site Visit....................................................................................................................... 12-1 Rosh Pinah Database Verification Procedures............................................................. 12-1 External Drill Hole Data Validation ............................................................................... 12-3 13 MINERAL PROCESSING AND METALLURGICAL TESTING ..................................... 13-1 14 MINERAL RESOURCE ESTIMATE ............................................................................. 14-1 Summary ..................................................................................................................... 14-1 Cut-Off Grade .............................................................................................................. 14-4 Primary Lenses ............................................................................................................ 14-5 Secondary Lenses ..................................................................................................... 14-29 Mineral Resource Reconciliation ................................................................................ 14-29 15 MINERAL RESERVE ESTIMATE ................................................................................ 15-1 Summary ..................................................................................................................... 15-1 Mining Modifying Factors ............................................................................................. 15-5 Plant Modifying Factors ............................................................................................... 15-6 Financial Modifying Factors ......................................................................................... 15-7 Mining Revenue ........................................................................................................... 15-8 Geological Resource Models Used for Evaluation ......................................................