June 2022 G-14642.71-006-R-Rev0_FINAL 42 9.5 Recommended Additional Work for the Next Design Stages WSP recommends the following additional works for the next stage of the mine design to address information gaps and increase the confidence level of the geotechnical assessment: 1. Review spatial distribution of the available geotechnical information in relation to the geological interpretation and the proposed WUG mine design for strategically planning additional geotechnical data collection for the following: a. In-situ stress measurements. b. Quantity and location of the required geotechnical laboratory tests. c. Detail geotechnical logging to increase knowledge of the rock mass quality and structural discontinuity sets. 2. QA/QC on the collected geotechnical information (i.e., geotechnical core logging, Point Load Test (PLT) and laboratory test results), if those were not done in the past. 3. Increase the geotechnical knowledge of the project site by carrying out televiewer logging of drillholes to get basic geotechnical data such as discontinuity orientation, Rock Quality Designation (RQD) and fracture frequency. 4. The next stage of the geotechnical assessment can be carried out upon the completion of the additional data collection programme, and listed below: − Rock mass characterisation. − Rock mass quality and their statistical output. − Interpretation of the laboratory test results. − In-situ stress interpretation. − Rock mass strength envelope. − Empirical stope design and potential dilution. − Rock mass Mode of failures. − Ground support assessment. − Kinematic analysis. − Geotechnical numerical modelling to re-assess the final crown pillar, pillar behaviour and high-stress concentration due to mining. − Vertical opening stability. − Strength of the cemented rock fill. − Geotechnical instrumentation. − Risk assessment.
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