2 125/336/58/ 1.3 Data Sources 1.3.1 Used data The development of the ground model has made use of the following data sources: 1:50,000 GNS Geological Map “Geology of the Waihi Area, map 21, 1996” Historical Aerial Photographs (1940’s and 1960’s, 1:16,000 set (GHD Sourced) LiDAR generated Digital Elevation Model, 0.1 m vertical resolution (OGL sourced) o Rendering of hill shade and topographic contour sets by GHD Geochemical surface field mapping shape files, corresponding alteration halos (OGL sourced) o Simplification of data into broader regions of alteration by GHD Proposed route alignment (OGL supplied) 1.3.2 Unused Data Data made available to GHD that has not been used for the development of the CSM is as follows: Window Sample 005 and 006 boreholes (OGL supplied) o Referred to for general interpretation of ground conditions. To be included within future developments of geological model when made into a 3D dataset. CSMAT survey lines (OGL Supplied) o Referred to for general interpretation of ground conditions and presence of faulting however seen as being located too far west, south and east of the proposed site to be extrapolated reliably. 1.4 Datum and Scale 1.4.1 Datum The data supplied to GHD from OGL has been recorded to the following projection and datum. GHD has produced the CSM to the same datum and projection: Map Projection: New Zealand Map Grid (NZMG) Datum: New Zealand 1949 1.4.2 Scale Surface Maps The topographic scale shown on the maps (see section 1.6 below) is 1:8,000. The lithological data shown on the maps is based off the 1:50,000 scale mapping undertaken by GNS (see section 1.3.1 for map reference). Tunnel Long Section The scale on the tunnel long-section (see section 1.6) is 1:2,500. 1.5 Assumptions and Interpretations The following geological assumptions and interpretations have been made during the development of the CSM: Mapped structural features (faults, lineaments) have been classified per the orientation of their trend line.
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