WKP PFS – Geotechnical Section Approved by: Approval Date: TBA OceanaGold PEX-000-PLN-046-A Page 2 of 22 1.2.1 Lithostratigraphy In the Scoping Study (SRK, 2019) the geotechnical domains were based on the lithology. These lithological domains included the following: • Eastern Rhyolite Flow • Multi Lithic Lapili Tuff • West Rhyolite Flow • Country Rock The Country Rock was defined as areas located outside of the wireframe surfaces that were provided. In this report the lithological domains are based on new lithological wireframe models. Only the following lithological models located adjacent to the PFS model are considered relevant: • Eastern Rhyolite Flow • Northern Rhyolite Flow • Post Min Andesite Flow Figure 1: Southern decline access lithology Figure 1 shows a cross-section (looking north) through the Southern Decline stope access. The stopes and access drives are located within the Eastern Rhyolite Flow.
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