DOROPO GOLD PROJECT PEA UPDATE JUNE 2021 Revision 0 Doropo Gold Project PEA Update TABLE OF CONTENTS 1 SUMMARY .......................................................................................................................................... 4 1.1 PROPERTY DESCRIPTION AND OWNERSHIP ................................................................................................ 4 1.2 GEOLOGY AND MINERALISATION ............................................................................................................. 4 1.3 STATUS OF EXPLORATION, DEVELOPMENT AND OPERATIONS ........................................................................ 5 1.4 MINERAL PROCESSING AND METALLURGICAL TESTING ................................................................................ 5 1.5 MINERAL RESOURCE ESTIMATES.............................................................................................................. 6 1.6 MINE DESIGN ...................................................................................................................................... 7 1.7 INFRASTRUCTURE .................................................................................................................................. 8 1.8 CAPEX ESTIMATE .................................................................................................................................. 9 1.9 OPEX ESTIMATE ................................................................................................................................. 10 1.10 FINANCIALS ....................................................................................................................................... 10 1.11 CONCLUSIONS .................................................................................................................................... 12 1.12 RECOMMENDATIONS ........................................................................................................................... 12 2 INTRODUCTION ................................................................................................................................ 13 3 RELIANCE ON OTHER EXPERTS ......................................................................................................... 14 4 PROPERTY DESCRIPTION AND LOCATION......................................................................................... 15 5 ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY .................. 17 6 HISTORY ........................................................................................................................................... 20 7 GEOLOGICAL SETTING AND MINERALISATION ................................................................................. 21 7.1 REGIONAL SCALE GEOLOGY .................................................................................................................. 21 7.2 PROJECT SCALE GEOLOGY ..................................................................................................................... 24 7.3 WEATHERING PROFILES ....................................................................................................................... 27 7.4 ALTERATION AND MINERALISATION ....................................................................................................... 29 8 DEPOSIT TYPES ................................................................................................................................. 32 9 EXPLORATION .................................................................................................................................. 33 9.1 COORDINATES, SURVEY CONTROLS AND TOPOGRAPHIC SURVEYS ................................................................. 33 9.2 GEOLOGICAL RECONNAISSANCE, MAPPING AND ROCK CHIP SAMPLING ........................................................ 33 9.3 AIRBORNE GEOPHYSICAL SURVEY ........................................................................................................... 34 9.4 SOIL SAMPLING .................................................................................................................................. 35 9.5 AUGER DRILLING ................................................................................................................................ 36 9.6 TRENCHING ....................................................................................................................................... 38 9.7 REGOLITH MAPPING AND INTERPRETATION ............................................................................................. 38 9.8 GRADIENT ARRAY INDUCED POLARISATION SURVEY .................................................................................. 38 9.9 AIRCORE DRILLING .............................................................................................................................. 38 10 DRILLING .......................................................................................................................................... 39 10.1 REVERSE CIRCULATION DRILLING ........................................................................................................... 39 10.2 DIAMOND DRILLING ............................................................................................................................ 40 10.3 SAMPLE RECOVERY AND GRADE ............................................................................................................ 40 42 10.4 TWIN HOLES ...................................................................................................................................... 42 10.5 WET RC SAMPLES .............................................................................................................................. 42 10.6 DRILL HOLE COVERAGE ........................................................................................................................ 42 11 SAMPLE PREPARATION, ANALYSES AND SECURITY .......................................................................... 60 11.1 REVERSE CIRCULATION SAMPLING METHODS .......................................................................................... 60 11.2 DIAMOND CORE SAMPLING METHODS ................................................................................................... 60 11.3 CHAIN OF CUSTODY AND TRANSPORT ..................................................................................................... 61 11.4 SAMPLE PREPARATION AND ANALYSIS .................................................................................................... 61 11.5 SAMPLE PREPARATION BY LABORATORY: ................................................................................................. 61 Page 1 of 163 Doropo Gold Project PEA Update 11.6 SAMPLES ANALYSES AT LABORATORY: .................................................................................................... 61 11.7 QUALITY ASSURANCE AND QUALITY CONTROL SAMPLING .......................................................................... 62 12 DATA VERIFICATION ......................................................................................................................... 69 12.1 DATA VERIFICATION BY CENTAMIN ........................................................................................................ 69 12.2 SITE VISIT .......................................................................................................................................... 69 12.3 DATABASE AUDIT ............................................................................................................................... 69 13 MINERAL PROCESSING AND METALLURGICAL TESTING ................................................................... 71 14 MINERAL RESOURCE ESTIMATES ...................................................................................................... 75 14.1 INTRODUCTION .................................................................................................................................. 75 14.2 DATA PROVIDED TO CUBE .................................................................................................................... 75 14.3 DATABASE ......................................................................................................................................... 75 14.4 WIREFRAME REVIEW AND DATA CODING ................................................................................................. 76 14.5 EXPLORATORY DATA ANALYSIS .............................................................................................................. 85 14.6 VARIOGRAPHY:................................................................................................................................... 89 14.7 BLOCK MODEL DEFINITION................................................................................................................... 91 14.8 GRADE ESTIMATION: ........................................................................................................................... 93 14.9 INITIAL PANEL ORDINARY KRIGING VALIDATION ........................................................................................ 96 14.10 DENSITY AND WEATHERING .................................................................................................................. 98 14.11 LOCALISED UNIFORM CONDITIONING ESTIMATE ....................................................................................... 99 14.12 CLASSIFICATION AND