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Technical Report for the Kensington Gold Mine, Juneau, Southeast Alaska, U.S.A

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Technical Report for the Kensington Gold Mine, Juneau, Southeast Alaska, U.S.A TECHNICAL REPORT FOR THE KENSINGTON GOLD MINE, JUNEAU, SOUTHEAST ALASKA, U.S.A. Prepared for Coeur Mining, Inc. NI 43-101 TECHNICAL REPORT – UPDATED PROJECT STUDY Effective Date: December 31, 2017 Report Date: April 25, 2018 Prepared by: Kyle Beebe, P.E., Coeur Alaska, Inc. Isaac Oduro, RM SME, MAusIMM (CP), Coeur Alaska, Inc. Raul Mondragon, RM SME, Coeur Mining, Inc. Kensington Mine Southeast Alaska, U.S.A. NI 43-101 Technical Report April 25, 2018 CAUTIONARY STATEMENT ON FORWARD-LOOKING INFORMATION This technical report (Report) contains forward-looking statements within the meaning of the United States (U.S.) Securities Act of 1933 and the Securities Exchange Act of 1934 and the equivalent under Canadian securities laws that are intended to be covered by the safe harbor created by such sections. Such forward-looking statements include, without limitation, statements regarding Coeur Mining, Inc.’s (Coeur’s) expectations for the Kensington Gold Mine and its expansions, including estimated capital requirements, expected production, cash costs and rates of return; Mineral Reserve and Resource Estimates; estimates of gold grades; expected financial returns and costs; and other statements that are not historical facts. We have tried to identify these forward-looking statements by using words such as “may,” “might”, “will,” “expect,” “anticipate,” “believe,” “could,” “intend,” “plan,” “estimate”, and similar expressions. Forward- looking statements address activities, events, or developments that Coeur expects or anticipates will or may occur in the future, and are based on currently available information. Although Coeur believes that its expectations are based on reasonable assumptions, it can give no assurance that these expectations will prove correct. Important factors that could cause actual results to differ materially from those in the forward-looking statements include, among others, reclamation activities; changes in Project parameters as mine and process plans continue to be refined; variations in ore reserves, grade or recovery rates; geotechnical considerations; failure of plant, equipment or processes to operate as anticipated; shipping delays and regulations; risks that Coeur’s exploration and property advancement efforts will not be successful; risks related to fluctuations in the price of gold; the inherently hazardous nature of mining-related activities; uncertainties with reserve and resource estimates; uncertainties related to obtaining approvals and permits from governmental regulatory authorities; and availability and timing of capital for financing exploration and development activities, including the uncertainty of being able to raise capital on favorable terms or at all; as well as those factors discussed in Coeur’s filings with the U.S. Securities and Exchange Commission (SEC), including Coeur’s latest Annual Report on Form 10-K and its other SEC filings (and Canadian filings). Coeur does not intend to publicly update any forward-looking statements, whether as a result of new information, future events, or otherwise, except as may be required under applicable securities laws. CAUTIONARY NOTE TO U.S. READERS CONCERNING ESTIMATES OF MEASURED, INDICATED, AND INFERRED MINERAL RESOURCES Information concerning the properties and operations of Coeur has been prepared in accordance with Canadian standards under applicable Canadian securities laws, and may not be comparable to similar information for U.S. companies. The terms “Mineral Resource”, “Measured Mineral Resource”, “Indicated Mineral Resource” and “Inferred Kensington Mine NI 43-101 Technical Report – Updated Project Study Page i of 254 Kensington Mine Southeast Alaska, U.S.A. NI 43-101 Technical Report April 25, 2018 Mineral Resource” used in this Report are Canadian mining terms as defined in accordance with National Instrument 43-101 (“NI 43-101”) under guidelines set out in the Canadian Institute of Mining, Metallurgy and Petroleum (“CIM”) Standards on Mineral Resources and Mineral Reserves adopted by the CIM Council on May 24, 2014. While the terms “Mineral Resource”, “Measured Mineral Resource”, “Indicated Mineral Resource” and “Inferred Mineral Resource” are recognized and required by Canadian securities regulations, they are not defined terms under standards of the SEC. Under U.S. standards, mineralization may not be classified as a Reserve unless the determination has been made that the mineralization could be economically and legally produced or extracted at the time the Reserve calculation is made. As such, certain information contained in this Report concerning descriptions of mineralization and resources under Canadian standards is not comparable to similar information made public by U.S. companies subject to the reporting and disclosure requirements of the SEC. An Inferred Mineral Resource has a great amount of uncertainty as to its existence and as to its economic and legal feasibility. 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 may not form the basis of feasibility or pre- feasibility studies. Readers are cautioned not to assume that all or any part of Measured or Indicated Resources will ever be converted into Mineral Reserves. Readers are also cautioned not to assume that all or any part of an Inferred Mineral Resource exists, or is economically or legally mineable. In addition, the definitions of Proven Mineral Reserves and Probable Mineral Reserves under CIM standards differ in certain respects from the standards of the SEC. Kensington Mine NI 43-101 Technical Report – Updated Project Study Page ii of 254 Kensington Mine Southeast Alaska, U.S.A. NI 43-101 Technical Report April 25, 2018 CONTENTS 1. SUMMARY 1 1.1 Introduction 1 1.2 Property Description, Location and Ownership 2 1.3 Accessibility, Climate, Local Resources, Infrastructure and Physiography 2 1.4 Surface Topography 2 1.5 History 3 1.6 Geology and Mineralization 3 1.7 Exploration 4 1.8 Drilling 4 1.9 Sampling and Analysis 4 1.10 Data Verification 5 1.11 Metallurgical Test Work 5 1.12 Mineral Resource Estimate 6 1.13 Mineral Resource Statement 7 1.14 Mineral Reserve Estimate 8 1.14.1 Mineral Reserve Statement 8 1.15 Mining Operations 9 1.16 Recovery Methods 11 1.17 Infrastructure 12 1.18 Environmental, Permitting and Social Considerations 12 1.19 Capital and Operating Costs 13 1.20 Economic Analysis 13 1.21 Conclusions 14 1.22 Recommendations 17 2. INTRODUCTION 19 2.1 Terms of Reference 19 2.2 Qualified Persons 19 2.3 Site Visits and Scope of Personal Inspection 19 2.4 Effective Dates 20 2.5 Information Sources and References 21 2.6 Previous Technical Reports 21 2.7 Units 22 3. RELIANCE ON OTHER EXPERTS 23 4. PROPERTY DESCRIPTION AND LOCATION 24 4.1 Project Description and Ownership 24 4.2 Land Tenure 26 4.2.1 Agreements, Royalties, other Encumbrances 27 5. ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY 35 5.1 Accessibility 35 5.2 Climate 35 5.3 Local Resources and Infrastructure 35 5.4 Physiography 36 5.5 Comments on Accessibility, Climate, Local Resources, Infrastructure and Physiography 36 6. HISTORY 37 6.1 Kensington Property pre-2006 37 6.2 Jualin Property pre-1993 37 Kensington Mine NI 43-101 Technical Report – Updated Project Study Page iii of 254 Kensington Mine Southeast Alaska, U.S.A. NI 43-101 Technical Report April 25, 2018 6.3 Coeur Alaska Activities 1993 to 2017 38 6.4 Previous Production 40 7. GEOLOGICAL SETTING AND MINERALIZATION 41 7.1 Regional Geology 41 7.2 Project Geology 43 7.3 Deposits 46 7.3.1 Kensington Vein System 46 7.3.2 Raven Vein 46 7.3.3 Comet Mine 48 7.3.4 Jualin–Empire Zone 48 7.4 Prospects/Exploration Targets 51 7.4.1 Seward 51 7.4.2 Thomas 51 7.4.3 Bear 51 7.4.4 Savage 52 7.4.5 Rose 52 7.4.6 Johnson 53 7.4.7 Big Lake–Yankee Boy 53 7.4.8 Ivanhoe-Hope 54 7.4.9 North Comet Ridge 54 7.5 Comments on Geological Setting and Mineralization 55 8. DEPOSIT TYPES 56 9. EXPLORATION 58 9.1 Kensington Vein System 59 9.1.1 Eureka Vein System 60 9.1.2 Raven Vein System 60 9.1.3 Elmira Vein System 60 9.1.4 Jualin/Empire Zone Vein System 60 9.2 District Wide Exploration 62 9.3 Grids and Surveys 62 9.4 Geological Mapping 63 9.5 Geophysics 64 9.6 Remaining Exploration Potential 65 9.7 Comments on Exploration 66 10. DRILLING 67 10.1 Drill Methods 67 10.2 Geological Logging 70 10.3 Recovery 70 10.4 Collar Surveys 70 10.5 Downhole Surveys 70 10.6 Geotechnical and Hydrological Drilling 70 10.7 Sample Length/True Thickness 71 10.8 Comments on Drilling 71 11. SAMPLE PREPARATION, ANALYSES AND SECURITY 72 11.1 Sampling Methods 72 11.1.1 Muck Sampling - Mine Development Headings 72 11.1.2 Channel Sampling - Mine Development Headings 72 11.1.3 Drill Core Sampling 73 11.2 Density Determinations 74 11.3 Analytical and Test Laboratories 74 Kensington Mine NI 43-101 Technical Report – Updated Project Study Page iv of 254 Kensington Mine Southeast Alaska, U.S.A. NI 43-101 Technical Report April 25, 2018 11.4 Sample Preparation and Chain of Custody 75 11.4.1 Mine Development Heading Sample 75 11.4.2 Drill Core Sample 76 11.4.3 Stope Definition Holes 76 11.4.4 Exploration and Definition Holes 76 11.4.5 Analytical Method 77 11.5 Quality Assurance and Quality Control 78 11.5.1 Certified Reference Materials 79 11.5.2 Blank Samples 80 11.5.3 Duplicates 83 11.5.4 Check Assays 83 11.6 Databases 84 11.7 Sample Security 84 11.8 Comments on Sample Preparation, Analyses and Security 84 12.
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