OUR VALUES: RESPECT | INTEGRITY | TEAMWORK | INNOVATION | ACTION | ACCOUNTABILITY 1 GEOTECHNICAL The geotechnical investigation undertaken by the OGC Studies Group team entailed the establishment of the geotechnical characterization and geotechnical design elements for the project area. 1.1 Overview To establish the geotechnical characteristics and design elements for the underground mine. The assessment entailed the following: • Understanding the geological setting of the gold deposit(s). • Creation and population of an interpretable geotechnical property database based on the limited geotechnical core logging available at the time of this study. • Collection and recording of suitable core samples for rock property testing in a laboratory, supported by field estimates (point loads) of rock strengths. • Graphical representation and interpretation of recorded data, culminating in compilation of a written report that qualifies the geotechnical environment. • Transformation of data into Barton's Q' value. • Transformation of data into N’-values for assessing stope dimensions using the Stability Graph Method. • Numerical stress modelling of various stope sequences and layouts using MAP3D. 1.2 Drill hole data Table 1 provides a list of 77 geotechnical drill holes that were provided in the data file WKP_DH_collar_info.csv. A drill hole database of these drill holes was created in Surpac. An RQD model was created within the drill hole database. Core photos for all of these drill holes were downloaded for visual review. Not all of the drill holes had geotechnical logging for the full suite of Q-rating parameters. This will be discussed in the section on the rock mass classification. Table 1: List of all available geotechnical drill holes
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