Sanbrado Gold Project, Burkina Faso
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NI 43-101 Technical Report: Sanbrado Gold Project, Burkina Faso Effective Date: 13 December 2017 Principal Office: 14 Southbourne Street, Scarborough WA 6019, Western Australia T: + 61 8 9481 7344 F: + 61 8 9481 7355 E: [email protected] www.westafricanresources.com ACN: 121 539 375 West African Resources Limited Document Information Page Principal Mining Engineer Qualified Persons Stuart Cruickshanks FAusIMM SCME Executive Engineer Tom Kendall FAusIMM, MMICA, Mintrex Pty Ltd FIEAust, CPEng Manager: Projects and Studies Leon Lorenzen FAusIMM, FSAIMM, Mintrex Pty Ltd FIEAust, CPEng Managing Director David Morgan MAusIMM, MIEAust, Knight Piesold Consulting Pty Ltd CPEng Principal Consultant Brian Wolfe MAIG International Resource Solutions Pty Ltd Effective Date 13 December 2017 Versions / Status FINAL REPORT Print Date 13 December 2017 NI 43-101 Technical Report: - Sanbrado Gold Project, Burkina Faso West African Resources Limited Table of Contents Executive Summary .......................................................................................... 1 Introduction ................................................................................................. 32 Reliance on Other Experts ............................................................................... 34 Property Description and Location ..................................................................... 35 Accessibility, Climate, Local Resources, Infrastructure and Physiography .................... 38 History ........................................................................................................ 41 Geological Setting and Mineralisation .................................................................. 46 NI 43-101 Technical Report: - Sanbrado Gold Project, Burkina Faso West African Resources Limited Deposit Types ............................................................................................... 52 Exploration .................................................................................................. 54 Drilling ........................................................................................................ 56 10.2.1 Hole Planning and Set-up ............................................................................... 58 10.2.2 Surveying and Orientations ............................................................................. 59 10.2.3 Hole Logging Procedures ................................................................................ 59 10.2.4 AC and RC Logging ........................................................................................ 59 10.2.5 DC Logging ................................................................................................. 59 10.3.1 Historical Dry Bulk Density Testwork by Channel ................................................... 60 10.3.2 WAF Dry Bulk Density Testwork ........................................................................ 60 Sample Preparation, Analyses and Security .......................................................... 65 11.1.1 Historical Work ............................................................................................ 65 11.1.2 West African Resources Ltd ............................................................................. 65 11.3.1 Channel Resources Ltd .................................................................................. 66 11.3.2 West African Resources Ltd ............................................................................. 66 11.4.1 Channel Resources Ltd .................................................................................. 66 11.4.2 West African Resources Ltd ............................................................................. 68 Data Verification ........................................................................................... 69 12.3.1 Thompson and Howarth Plot (T & H Plot) ............................................................ 70 12.3.2 Rank % HARD Plot ......................................................................................... 70 12.3.3 Mean vs. % HARD Plot .................................................................................... 70 12.3.4 Mean vs. %HRD Plot ...................................................................................... 70 12.3.5 Correlation Plot ........................................................................................... 70 12.3.6 Quantile-Quantile Plot ................................................................................... 70 12.3.7 Standard Control Plot .................................................................................... 71 12.3.8 Cusum Plots ............................................................................................... 71 12.4.1 Standards .................................................................................................. 71 12.4.2 Blanks ....................................................................................................... 87 12.4.3 Pulp (Laboratory) Repeats .............................................................................. 87 12.4.4 Field Duplicates ........................................................................................... 87 NI 43-101 Technical Report: - Sanbrado Gold Project, Burkina Faso West African Resources Limited Metallurgy and Process Development .................................................................. 94 13.5.1 Samples Testwork Program A15684 ................................................................... 98 13.5.2 Results Testwork Program A15684 ..................................................................... 98 13.5.3 Abrasion Index and Ball Mill Work Index Program A15684 ........................................ 100 13.5.4 A15684 Summary ........................................................................................ 100 13.6.1 Samples Testwork Program A16326 .................................................................. 101 13.7.1 Summary of Testwork Program A16326 Part A ..................................................... 104 13.8.1 Samples Utilised for Testwork Program 2016 - A16326 Part B ................................... 104 13.8.2 Results Testwork Program A16326 Part B ........................................................... 105 13.8.3 Bulk Tests for Testwork Program A16326 Part B ................................................... 106 13.8.4 Summary of Testwork Program A16326 Part B ..................................................... 111 13.9.1 Samples Utilised for Testwork Program A16557 .................................................... 112 13.9.2 Results of Testwork Program A16557 ................................................................ 112 13.9.3 Summary of Testwork Program A16557 .............................................................. 125 13.10.1 Samples Utilised for Testwork Program A17283 .................................................... 126 13.10.2 Results Testwork Program A17283 .................................................................... 126 13.10.3 Summary of Testwork Program A16283 .............................................................. 127 13.11.1 Samples Utilised for Testwork Program A17341 .................................................... 128 13.11.2 Results Testwork Program A17341 (Comminution) ................................................ 128 13.11.3 Results Testwork Program A17431 (Gravity and Leaching) ....................................... 131 13.11.4 Summary of Testwork Program A17431 .............................................................. 134 13.12.1 Samples Utilised for Testwork Program A17750 .................................................... 135 13.12.2 Results Testwork Program A17750 .................................................................... 135 13.12.3 Summary of Testwork Program A17750 .............................................................. 137 13.14.1 Channel Resources/SGS Work ......................................................................... 139 13.14.2 WAF Mineralogical Work ................................................................................ 140 13.15.1 Evaluation of Key Gold Leaching Processing Variables ............................................ 142 13.15.2 Gravity Gold Recovery .................................................................................. 150 13.15.3 Reagent Consumptions ................................................................................. 157 13.15.4 Silver Metallurgy ......................................................................................... 159 13.15.5 Sulphide Influences and Leach Feed Head Grade .................................................. 160 13.16.1 Methodology .............................................................................................. 164 13.16.2 Final Algorithms ......................................................................................... 169 NI 43-101 Technical Report: - Sanbrado Gold Project, Burkina Faso West African Resources Limited Mineral Resource Estimates ............................................................................ 172 14.2.1 Database Validation ..................................................................................... 172 14.2.2 Summary of Data Used in Estimate ................................................................... 173 14.2.3 Interpretation and Modelling .........................................................................