400 500 600 700 800 900 1,000 1,100 1,200 May-1988 May-1989 May-1990 May-1991 May-1992 May-1993 May-1994 May-1995 May-1996 May-1997 May-1998 May-1999 May-2000 May-2001 May-2002 May-2003 May-2004 May-2005 May-2006 May-2007 May-2008 May-2009 May-2010 May-2011 May-2012 May-2013 May-2014 May-2015 May-2016 May-2017 May-2018 May-2019 May-2020 May-2021 May-2022 May-2023 May-2024 May-2025 May-2026 May-2027 May-2028 May-2029 May-2030 May-2031 May-2032 May-2033 Groundwater Level (RL m) Ref. Level - Martha Pit North Wall approx. crest Ref. Level - Martha Pit South Wall approx. crest Ref. Level - Waihi East - Indicative level. - Tunnel corridor Ref. Level - Approx Ohinemuri River channel level southwest of GOP Ref. Level - GOP Final Base Level Ref. Level - MOP Base Level Prior to Slip in 2015 Ref. Level - Favona to Correnso Low Level Pass Ref. Level - Correnso Deep (Gladstone) Sump Ref. Level - Historical Mine Dewatering Level Ref. Level - Consented MUG Dewatering Level Martha Pit/ Town UG Water Level MUG Empire PC1 UG Bore MUG Edward PC2 UG Bore MUG GW Drawdown Ref. Level - Waihi East - Indicative base of younger volcanics Ref. Level - MUG and Ore Tunnel Portal Level Ref. Level - Ore Tunnel Low Point Estimate Ref. Level - Top of Favona UG Ref. Level - Base of Favona UG Favona Decline Favona UG decline development Groundwater drawdown beneath Martha Open Pit and, from 2015, from the Correnso UG OCEANA GOLD (NEW ZELAND) LTD WAIHI NORTH PROJECT Waihi Town - Dewatering and Reference Levels Ref. No: 9049 Date: June 2022 Drawn: CL/ET File: 9049-Settlement Engineering Geology Ltd Unit 7C, 331 Rosedale Rd, PO Box 301054, Albany Auckland , NZ Ph (09) 4862546 Fax (09) 4862556 Figure 4 Notes: RL in Mine Datum Reference levels plotted are not time referenced GOP base level New UG and ore tunnel portal level Waihi East - Wharekirauponga Access Tunnel corridor - Approx. base of younger volcanics Favona UG levels Wharekirauponga Access Tunnel levels
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