EGL Ref: 9215 23 June 2022 Page 9 This report shall only be read in its entirety. File: WAI-985-000-REP-LC-0002_Rev0.docx. FIGURE 7: 1:50000 GEOLOGY OF THE WAIHI AREA MAP FROM BRATHWAITE AND CHRISTIE (1996) WITH MAIN UNITS MARKED 3.2.3. Geology Around the Development Site The Development Site area, where Storage 1A and 2 are situated, is underlain by a sequence of ignimbrite, lacustrine deposits, rhyolite, dacite, and finally andesite. The older dacite dips beneath the rhyolite. The dacite outcrops approximately along the Ohinemuri River to the west and is observed in borehole WG4 beneath Storage 1A’s southwest toe at 16.5 m down hole depth. Toward the northeast side of Storage 1A a deep borehole GTO20 indicates dacite at 156 m, beneath the rhyolite of the Ruahorehore Dome which is visible as the hills behind Storage 1A and 2. The west toe of Storage 2 is founded on ignimbrite over the dacite. The rest of Storage 2 is founded on rhyolite. Storage 1A is constructed over a series of Rhyolite ridges, knolls and gullies. Figure 8 shows the general geology of the Development Site.
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