WKP PFS – Geotechnical Section Approved by: Approval Date: TBA OceanaGold PEX-000-PLN-046-A Page 7 of 22 1.5 Laboratory testing 1.5.1 Rock Density The WKP rock density database used in this report is based on rock sample density information from the following file: WKP_DH_SG_values_20201127.xls. There are 352 density samples taken from 84.2m of drill core. The drill holes in this density database are shown in Table 5 below. Table 5: Drill holes used in the WKP rock density database The density data base provides information that can be used for estimating vertical stress. The rock density also has a high correlation with rock strength, i.e. higher rock densities are associated with relatively higher UCS values. The WKP rock density statistics are shown in the table below. The average and the mean density are both approximately 2.5 t/m3, and this implies that the vertical stress gradient can be approximately as 2.5 MPa per 100m of depth below surface. Table 6: Rock density statistics
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