WKP PFS – Geotechnical Section Approved by: Approval Date: TBA OceanaGold PEX-000-PLN-046-A Page 6 of 22 Table 3 below shows a summary of the Q-ratings and GSI values for the hangingwall, footwall and vein. As expected, the hangingwall and footwall have nearly identical values. The vein material appears to have slightly lower values compared with the host rock. This could possibly be caused by slightly more intense shearing in the vicinity of the mineralization. In general, the median values and the weighted average values are similar, and they descrive a “fair quality” rock mass using Barton’s Q-rating description. The 1st quartile values descrive a “poor quality” rock mass according to the Barton system. In practical terms, however, the 1st quartile values are still good enough to pull 4m rounds in a 5m x 5m development drive, and these drive can be easily supported with 1.8m Friction Bolts and weld mesh. Fibrecrete would only be necessary where Q<1. Table 3: Summary of Q-ratings and GSI values Table 4 shows a summary of the Q-ratings described in the WKP Scoping Study, and this data was generated using only 422m of core logging. 1st quartile values are similar to those described in the most current analysis that used 1,910 metres of core logging. From a design perspective at a PFS level, the 1st quartile values should be used for the geotechnical designs. Table 4: Summary of Q-ratings from the WKP Scoping Study (SRK, April 2019)
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