Supporting Technical Assessments

91 55 82 101 85 104 99 HW Casing Push tube HW Casing CWRS CW CWRS CW HW CWHW RS CWHW HW 0 55 68 83 91 89 S M S VS F VS ML MH ML TOPSOIL: SILT, minor fine sand; brown, very soft, saturated, rootlets present SILT, some fine to coarse sand, poorly-graded, trace clay; brown, very soft, saturated, minor rootlets present SILT, some clay, minor fine sand; brown, moist, high plasticity SILT, some fine sand and clay; brown, very soft, saturated from 1.7m: soft, wet Completely weathered-residual soil, fine to medium grained, reddish grey DACITE; very weak to extremely weak; closely spaced joints (joints not easily distinguished) in CW-RS Soil Silty fine to coarse SAND, poorly-graded, wet, soft to very soft from 3.0m: becomes completely weathered, very weak from 3.53m: becomes completely weathered to highly weathered, weak from 4.83m: becomes completely weathered, very weak to extremely weak from 5.09m: becomes very weak from 5.6m: becomes highly weathered, color changed to grey with distinct shade of white phenocrysts (weathered), slight reddish colour, weak from 6.5m: becomes moderately strong to strong from 7.5m: completely weathered to highly weathered, increased red color, weak from 9.1m: residual soil, SILT, some fine to medium sand, poorly graded, moist, soft to very soft, extremely weak from 9.18m: completely weathered to highly weathered, very weak to weak, grey with shade red staining, weathered grains Alluvium Coromandel Volcanics 0.1 [] 0.5 [] 1.5 [] 1.8 [] -NOTE: Push Tube in 2nd BH (WRS05) -1.8-1.9m NOTE: Encountered rock -Joint at 6.11-6.18m: Gently inclined, fine to coarse angular gravel, Iron staining -Joint at 8.12m: Very steeply inclined, undulating, rough, narrow -Joint at 8.26m: Subhorizontal, undulating , rough, tight, Iron staining PO Box 6543 Auckland 1141 GHD Limited Project Quattro OceanaGold Ltd Waihi - Waste Rock Stack 51/37083 Site Identification: Logged: Processed: Checked: Project: Client: Site: Job No.: WRS05a HB AS HB BOREHOLE with Piezo LOG Commenced: 09-Jun-17 Completed: 09-Jun-17 Contractor: Perry Geotech Datum: Total Depth: 21.0m Sheet 1 of 3 BOREHOLE LOG NZ ALT 5137083_NZ LIB_PROJECT QUATTRO - WRS HB COMPLETE DRAFT.GPJ NZ GINT DATA TEMPLATE VER 1.5.GDT 10/8/17 Piezometer Shear Vane: Drilling Method 1 2 3 4 5 6 7 8 9 10 -90 Comments: ROCK DESCRIPTION: Weathering, colour, fabric, ROCK NAME (Formation Name) W MS VS S Water Bore Diameter (mm): Inclination: VW ES Core Run / Recovery (%) 20 60 200 600 2000 SOIL DESCRIPTION: (Soil Code), Soil Name [minor MAJOR], colour, structure [zoning, defects, cementing], plasticity or grain size, secondary components, structure. (Geological Formation) / Defect Spacing (mm) RQD (%) Estimated Rock Strength EW Graphic Log Classification Support / Casing (m) JD Tractor Rig Depth (m)/ [Elev.] Equipment: Weathering Consistency/ Relative Density Moisture Condition TESTS & SAMPLES / ROCK MASS DEFECTS: Depth, Type, Inclinations, Roughness, Texture, Aperture, Coating Geological Fm 1 2 3 4 5 6 7 8 9 10 96 -Jointing, gently to steeply inclined, smooth to rough, iron and manganese staining at: 3.15m 3.3m 3.67m 3.83m 3.91m 3.96 m 4.12m 4.15m 4.2 m 4.67m 4.85m 5.35m 5.62m 5.79m -Joint at 8.28m: Gently inclined, undualting, rough, very narrow to tight -Joint at 8.47m: Undulating to stepped, smooth to rough, Manganese and minor Iron, subhorizontal, very narrow -Joint at 9.17m, subhorizontal, gently inclined, undulating, rough, Iron staining -Joint at 9.4m, Gently inclined to moderately inclined, undulating, rough, Iron and Manganese staining, very narrow -Joint at 10.0m, minor Iron staining, very narrow

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