June 2022 G-01483.84-017-R-Rev0 iv TABLES Table 1: Summary of Atterberg limits testing completed on samples from Willow Road farm...........................11 Table 2: Results of XRD testing on samples from Willow Road farm. ...............................................................14 Table 3: Results of allophane content test of sample from WNDD007. .............................................................15 Table 4: Results of shear vane testing of soils exposed in test pits at Willows Road Farm. .............................15 Table 5: Results of unconfined compressive strength (UCS) testing of rock from two drill holes at Willows Road farm. ............................................................................................................................................17 Table 6: Design properties of materials. .............................................................................................................23 Table 7: Rock Mass characteristics. ...................................................................................................................23 Table 8: Groundwater conditions adopted for analyses. ....................................................................................23 Table 9: Stability analysis results for a static short-term case - Section A-A’. ...................................................25 Table 10: Stability analysis results for a static short-term case - Section B-B’. .................................................25 Table 11: PFS WRS and haul road design criteria.............................................................................................26 Table 12: Schedule summary of cumulative material movement volumes (loose cubic metres (LCM) by year (rounded) to WRS. ...............................................................................................................................28 Table 13: Estimated WRS and surface elements soil material volumes in cubic metres (rounded*). ...............28 Table 14: Willows Collection Pond dimensions. .................................................................................................31 Table 15: Catchment data used in the assessment. ..........................................................................................36 Table 16: SCS General input parameters. .........................................................................................................40 Table 17: Initial Stage Q1 Catchment characteristics and peak runoff estimation. ............................................41 Table 18: Final Stage (Q17) catchment characteristics and peak runoff estimation. .........................................42 Table 19: Results of high level culvert sizing. ....................................................................................................43 Table 20: Typical trapezoidal channel dimensions and lining. ...........................................................................44 FIGURES Figure 1: Waihi North Project elements overview (source Mitchell Daysh 2022).................................................2 Figure 2: Overall Site Location. ............................................................................................................................5 Figure 3: Geology. ................................................................................................................................................8 Figure 4: Geomorphological Layout. ....................................................................................................................9 Figure 5: Testpit and Borehole Locations. ..........................................................................................................10 Figure 6: Results of Atterberg limits testing presented on USCS plasticity chart...............................................12 Figure 7: Results of particle size distribution tests on samples from Willow Road farm. ...................................13 Figure 8: WRS Completed Year 5 (Q17) – Overview.........................................................................................22 Figure 9: Pond volume up to 24h storm with C=1 (source: GHD). .....................................................................30 Figure 10: WCP Overview. .................................................................................................................................32
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