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Golden Star Resources Ltd. 150 King Street West Suite 1200 Toronto ON, M5H 1J9, Canada

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Golden Star Resources Ltd. 150 King Street West Suite 1200 Toronto ON, M5H 1J9, Canada NI 43-101 Technical Report on Resources and Reserves, Golden Star Resources, Wassa Gold Mine, Ghana Report Date: June 20, 2019 Effective Date: December 31, 2018 Golden Star Resources Ltd. 150 King Street West Suite 1200 Toronto ON, M5H 1J9, Canada Qualified Persons Martin Raffield, P.Eng Mitch Wasel, MAusIMM (CP) Philipa Varris, MAusIMM (CP) June 2019 NI 43-101 Technical Report on Resources and Reserves, Golden Star Resources, Wassa Gold Mine, Ghana Page ii Table of Contents 1 Executive Summary................................................................................................ 1 1.1 Introduction ..........................................................................................................................1 1.2 Property Description and Ownership ...................................................................................2 1.3 Geology and Mineralization ................................................................................................2 1.4 Exploration Status ................................................................................................................3 1.5 Mineral Resources ...............................................................................................................4 1.6 Mineral Reserves .................................................................................................................6 1.7 Mining … .............................................................................................................................7 1.8 Recovery Methods ...............................................................................................................8 1.9 Infrastructure ........................................................................................................................8 1.10 Market Studies and Contracts ..............................................................................................9 1.11 Social and Environmental Aspects ......................................................................................9 1.12 Capital and Operating Costs ..............................................................................................10 1.13 Economic Analysis ............................................................................................................10 2 Introduction .......................................................................................................... 12 2.1 Scope of Technical Report .................................................................................................12 2.2 Qualified Persons ...............................................................................................................13 2.3 Site Visits ...........................................................................................................................13 3 Reliance on Other Experts ................................................................................... 14 4 Property Description and Location .................................................................... 15 4.1 Location of Mineral Concessions ......................................................................................15 4.2 Mineral Titles and Agreements ..........................................................................................19 4.3 Surface Rights ....................................................................................................................19 4.4 Royalties and Encumbrances .............................................................................................19 4.5 Historic Environmental Liability and Indemnity ...............................................................20 4.6 Permits and Authorization .................................................................................................20 5 Accessibility, Climate, Local Resources, Infrastructure and Physiography .. 21 5.1 Accessibility .......................................................................................................................21 5.2 Physiography and Vegetation ............................................................................................21 5.3 Land Use and Proximity to Local Population Centres .......................................................21 5.4 Local Resources and Infrastructure ...................................................................................22 5.5 Climate and Length of Operating Season ..........................................................................23 5.6 Wassa… .............................................................................................................................23 5.7 Hwini-Butre/Benso/Chichiwelli ........................................................................................24 6 History ................................................................................................................... 25 6.1 Wassa … ............................................................................................................................25 6.2 Hwini-Butre, Benso and Chichiwelli .................................................................................26 6.3 Historic Mineral Resource and Reserve Estimates ............................................................27 6.4 Historic Mine Production ...................................................................................................28 7 Geological Setting and Mineralization ............................................................... 30 7.1 Regional Geology ..............................................................................................................30 June 2019 NI 43-101 Technical Report on Resources and Reserves, Golden Star Resources, Wassa Gold Mine, Ghana Page iii 7.2 Local Geology and Mineralization ....................................................................................33 8 Deposit Types ........................................................................................................ 49 8.1 Wassa… .............................................................................................................................49 8.2 Hwini-Butre .......................................................................................................................52 8.3 Benso…..............................................................................................................................53 8.4 Chichiwelli… .....................................................................................................................54 9 Exploration ............................................................................................................ 56 9.1 Introduction ........................................................................................................................56 9.2 Wassa… .............................................................................................................................56 9.3 Hwini-Butre .......................................................................................................................59 9.4 Benso and Chichiwelli .......................................................................................................60 10 Drilling ................................................................................................................... 62 10.1 Open Pit .............................................................................................................................62 10.2 Underground ......................................................................................................................65 11 Sample Preparation, Analyses and Security ...................................................... 66 11.1 Sample Preparation ............................................................................................................66 11.2 Sample Despatch and Security ...........................................................................................66 11.3 Laboratory Procedures .......................................................................................................66 11.4 Quality Control and Quality Assurance Procedures ..........................................................71 11.5 Specific Gravity Data .........................................................................................................71 12 Data Verification .................................................................................................. 74 12.1 Introduction ........................................................................................................................74 12.2 Data verification by GSR ...................................................................................................74 12.3 Analytical QA/QC .............................................................................................................74 13 Mineral Processing and Metallurgical Testing .................................................. 92 13.1 Historical Testing ...............................................................................................................92 13.2 Recent Metallurgical Testwork ..........................................................................................92 13.3 Testwork Findings .............................................................................................................95 14 Mineral Resources .............................................................................................
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